James Smallcombe: Well, so, so, so, yeah. So welcome to
James Smallcombe: lock down seminar. So Mario Gomez Ramos has joined us this week, little bit of history Mario did his PhD at the University of Seville.
James Smallcombe: And then after that an extremely short stint a university. Sorry, and then back to the bill. And then following back about a year and a half ago, and we moved to Darmstadt, which is where it's based at now.
James Smallcombe: And so today we're going to be hearing about the studying of quenching factors. The PBN and p two, p reactions through the transfer to the continue formalism, and without any further ado, I'll hand over to America and say, please do. Tell us about this one.
Mario Gomez: Okay, so
Mario Gomez: Thank you very much for the introduction and I must say that
Mario Gomez: I really should have thought about the title because I will not only be talking about quitting, but also about other stuff related to be to be and P2P reactions will be stock.
Mario Gomez: That will include the extension, two, three. Bobby nuclei. I'm bamian a system and also the PSA upset people but we with the main topic will be the P2P MVP and reactions.
Mario Gomez: With
Mario Gomez: reactions in which a proton is made to collide with a nucleus in such a way that only one of the nucleus in the nuclei in their classes me teeth and they
Mario Gomez: They received will a minus one call it remains a company detected. These reactions are usually perform at an energy of around 200 to 400 any to increase a nifty. Part of the problem is a nucleus and make sure that the only collides with one of the nucleus. So at the receiver Corps survives.
Mario Gomez: And these reactions or something called bossy free because
Mario Gomez: Due to the high energy of thing going scrotum. It's a privilege, which is quite short. So it will only interact with the nuclear meat is expanding. So the reaction can be see as very similar to the free interaction between the proton and the nuclear
Mario Gomez: Which is actually quite convenient because that means that if you measure the momentum of the receiver Corps.
Mario Gomez: You can assume that it was a the opposite of the momentum of the of the nuclear you removed.
Mario Gomez: And then by measuring a court in the comments will distribution to have access to the way function of the remote
Mario Gomez: Looking and, as it were, and that's quite useful for a set of measurements, because they shape of the momentum distribution gives you information on the angular momentum that a nucleus.
Mario Gomez: And the multitude each you information about the revision number of the corresponding level which is quite important for a topic that we will be covering today.
Mario Gomez: And
Mario Gomez: A to get a two step establish a P2P we have to mention that they they were already known have
Mario Gomez: Quite a long ago in the 60s and 70s out of measurements were perform on stable nuclear which were able to their mind quite well the properties of many different levels of stable nuclear. As you can see in the stable a by nice
Mario Gomez: But also any recently, thanks to the interaction of probiotic being facilities.
Mario Gomez: These studies have been extended to rally active nuclei to a certain species and they have been quite a recent measurements both a three game and a DSI the celebration, we will be focusing on today.
Mario Gomez: So next I will introduce the method I have used we have used to describe these reactions, which is a method we call a transfer to a continuum.
Mario Gomez: And we'll call it like that because we mother, the reaction as a process in which you have your, your nuclear first bound to your nucleus, a
Mario Gomez: And then after the reaction, you will assume that it goes to state of this new system formed by these nuclear and they collide import them.
Mario Gomez: But that the state has a positive energy and that's going to continue and then you're basically just transferring your nutrients from your spouse nucleus to awesome to have PM. So, but these they transferred to a continuum.
Mario Gomez: So we model the process through the prior representation of mathematics, which means that the main interaction that is going to influence to carry this reaction.
Mario Gomez: Is the interaction between the proton. The nuclei. These actually a fits very well with a question for picture that they have described before, in that any interaction really happens between the proton and neutron without seen much of a sequel nuclear
Mario Gomez: Then you have also a remnant them that correspond to the rest of interaction. But if you can see here, then called see the nucleus. A are expected to be quite similar. So these difference expected to be small.
Mario Gomez: And the way we keep it in our description of the reaction, then we have to deal with the way functions of the earlier no PSA and the receiver.
Mario Gomez: Corps. See, but we assume that they state that the internal coordinates of the core and not modified human reaction, which means that we can just integrate all of them and get the
Mario Gomez: Usual a description of these overlap with function that is single particle we function fine that we usually obtained through sexual potential for example, times the square root of the status will be factors that can be obtained from our special populations that
Mario Gomez: interaction model or
Just scale, shame on population. Everything here is pretty standard.
Mario Gomez: Then we also have to deal with a finance people we function that can be very complicated. But what we do is that we expand it in continuum states of the proton and neutron that we a district is as beings, so that we have to wake up wake states and then we stress the status or some of
Mario Gomez: The product of the being times a corresponding away function which we putting our metrics and then you will get solved and
Mario Gomez: The nice thing about the the say discretion is that you can take out the spirit of a factor and then obtain that if you want to have to get the overall a section.
Mario Gomez: You can obtain a single political way function that delivery penalties, we can show them five times it will be factor which is again what quite convenient, as we will see in the following
Mario Gomez: And now we will talk about the winching so these 20 factors. First, let's see what the yet. So the infrequency factor is that when you are computing when you are computing
Mario Gomez: Experiment cross section of theoretical section and we want to compare to experiment. It's found that in general when you compare them. The theoretical section teams to overestimate the experimental one
Mario Gomez: And in these in these analyses of a brain reactions or whatever form in the 1990s. It was found that for very different nuclei, although all of them were stable the factor that relate to the Experimental and the theoretical section were found to be quite concept.
Mario Gomez: Around 0.62 0.7 and we see it was. And this was the what was called a 20 reduction factor.
Mario Gomez: In order to get these factors, you have to perform your theoretical calculation, which will correspond to a single particle path reaction.
Mario Gomez: And an OB factor comes from the structure here or we instruction page even do anything complicated they assume the independent political model.
Mario Gomez: So basically we do yesterday invasion model and you look at the number of particles that are available in your last year and that would be yesterday.
Mario Gomez: With this idea. They found that they all were credited the experimental result with a factor of around 30 to 40%
Mario Gomez: And interpret this as the effect of correlations that are not including initial model. So basically, that means that the correlations in 30% or 40% of your fashion away from the states that you would expect from a very simple model.
Mario Gomez: Now these things but interesting when a similar study was performed for nuclear reactions knockout reactions are quite similar to the
Mario Gomez: Reactions that I have this ready for us PPA, but instead of having a problem you have another target to have your target and you just select the reaction that allows the receiver Corps with Amy minus one nucleus to survive.
Mario Gomez: And what they found is that for a stable nuclear
Mario Gomez: The reduction factor that they obtained were quite similar, but when they went to monitor the camera symmetric is pieces they found a very interesting result.
Mario Gomez: In which if they started, for example, are neutral Reese's Pieces and the remove the neutron that is quickly bound
Mario Gomez: Then the ratio between the theoretical and experimental section became close to one. But if we tried to remove the problem, which is deeply bound, then they severely overestimated the experimental section.
Mario Gomez: Which means that if the reaction work. And that means that deeply boundless PCs in in mathematics, nuclear, it's a much more effective by nuclear nuclear correlation
Mario Gomez: And that's something that was quite enticing for for the people saying these reactions.
Mario Gomez: But then they found something that even expect and at least when transfer reactions were similar typical
Mario Gomez: Reaction when you start with a new term and you end up with the helium three or with a tritium
Mario Gomez: When they drive to obtain a these dependence on the 20th factors, they found that they didn't have it that for them. The question factor was around 0.6 I was
Mario Gomez: Basically, independent of how deeply bound the nuclear the nuclear worse.
Mario Gomez: But this is a problem because the structure that you least action pathway in the nuclear sector that you're exploring both reaction should be same.
Mario Gomez: So if these quenching originated from the correlations, then there is no fear retaliation. Why should be more BC. Well, in our gut reactions and not in transfer, which put into about the description of the reaction mechanism that have been used in knockout and transfer
Mario Gomez: And for that, then come PP and reactions which, as I've said before they are understood to work in a positive way. So people think they control them personally.
Mario Gomez: So Davey as well. Let's try to do the same for the reactions and see if they look like knockout and they look like transfer and here I will be some now the results we obtained for our recent experimental measurement of mustard format your side.
Mario Gomez: First of all, just a taste of LED will be sent here the momentum distributions that we obtained for carbon 12 on a TC thing out into the two. And you can see that they described recently with experimental data.
Mario Gomez: Which tells us that that thing we are doing these type of thing seems to work. Personally, OK.
Mario Gomez: And now let's see how they went to a few years looks like here I presented to be finished results. The blackbirds and the red squares.
Mario Gomez: Which are both corresponding to our model or transfer to the continuum on the same experimental data.
Mario Gomez: But we have use different sets of optical potentials of ticket potentials are usually the thing that is less under control.
Mario Gomez: In a reaction population. So it's quite important to know to see which is the the effect on the on the uncertainty in these of the couple times.
Mario Gomez: And you can see that the trends that you find are somewhat different. So for example, the blood curve is in flux. One is by points were present decreasing slope, but none of them are as steep the results that were found for knockout that represented here in the brown band.
Mario Gomez: So it seems that we actually better with Atlanta in that there is a small if any dependence on these symmetry.
Mario Gomez: We were not the first one to study these these a experiment when they were police. So the results.
Mario Gomez: Were established using a DWI of the static web inputs approximation formalism, which was basically an extension of the former axiom that will have been used in these experiments by the hackathon presented by April Marie.
Mario Gomez: And you can see here that we engineer are in a reasonable legal agreement with the results that they present a bit recently there.
Mario Gomez: Are some notice he must be taken for a results that we find for high a a delta is this, what is, is basically the difference of the separation and add
Mario Gomez: Between the in this case a proton and neutron. So the larger container is the more bound is one of the articles compared to the URL.
Mario Gomez: So it should be close to see though for the current world hunger consisting and then if you also need to know, play it should be Latin negative when are removing them from and that positive when you're demoing the product.
Mario Gomez: And we wanted to understand why we have these larger differences when you go to
Mario Gomez: To allow advertisers. So we perform what we call a knowledge test, which is no fancy name for something that is happy. But basically, what we did was, yes. To put a small not so basically just a peek in our potential our of the potentials and we started when we were sensitive to the speak.
Mario Gomez: If you have a reaction that has some kind of absorption, then whatever happens inside this absorption range, it should not be visible for your survival. So if you put a peek and you see how it how it
Mario Gomez: Evolves when you push it to the surface. You can check to which trains of distances. Your reaction is sensitive and we found that when you consider reaction in which you are removing weekly bound nuclear then they much test gave sensitivity to light up stances that when you are moving
Mario Gomez: More deeply about one which up to it comes as no surprise. If you want to remove all the people at the peak of nuclear and you have to go deeper inside the nucleus to get it out.
Mario Gomez: But when you compare it to the optical potentials that you have been using. You see that if you are removing the weekly power a nuclear, then you get
Mario Gomez: Sensitivity area. What are the potentials are not so different, because they have been that the mind from from elastic scattering an elastic discovery. Cecily sensitive to the surface.
Mario Gomez: However, when you are trying to remove more deeply bound nuclear. Then you go deeper inside of your inside the nucleus.
Mario Gomez: Into arrange that it seems is not so weatherman probably which was once again elastic a scattering that is used to fix these potentials. It's more sensitive to the surface. So, there is a
Mario Gomez: And the ammunition and uncertainty when you are exploring the multiple ones which may explain why we have like a differences in our calculations and with the others have represented
Mario Gomez: But nevertheless, in spite of this uncertainty, it seems clear that there is a small dependence and that there is something wrong with not
Mario Gomez: Well, but before we wanted to check on all the inputs of the calculation we, in this case, the special effects that we were considering
Mario Gomez: In the results that they have presented to you before we use the spotter we factors obtained from the very witty interaction in as a model equation we try to change the introduction.
Mario Gomez: To one by going good with without modifications and if you will receive any any modifications in the lines, it's because they really aren't so we didn't find any big changes which meant that our results is quite a robust when come
Mario Gomez: Up by the Spirit will be factors within reason.
Mario Gomez: Which seems that is kind of the nail in the coffin for the results in the in the knockouts in multiple experiments and that there is something wrong there. But yes.
Mario Gomez: Because I like to keep Congress, I got to be a knockout for you and ideas considered only the nuclei that's happening measure for the VPN.
Mario Gomez: Is for you resubmit of because also carbon thing is has been measured there. But as you can see, if you try to compute yes i linear feet of the equation of these points.
Mario Gomez: You see that this low per unit is quite smaller and in this novel agreement with what you get in PB reaction.
Mario Gomez: So the question is,
Mario Gomez: There are actually a lot of nuclei corresponding to be as the share that cabin be measuring PPM reaction.
Mario Gomez: When they get measure. Will they still follow the flood friend or will they get steeper and get closer to not, we will not know until they are mission.
Mario Gomez: And now we move to a different topic. Yes, the three body nuclear they via is that we have
Mario Gomez: This idea for the VPN reactions in but you collide with only one nuclear them and the rest of the nuclear has not, it's not more exciting and that
Mario Gomez: Sits in as a very enticing Pro to analyze borrow me and systems closing Borromeo systems you can model the nucleus as athlete. Bobby, a system in which any of the two or the subsystems is not bound. So if you remove all the particles. They have to go into separate and be emitted different
Mario Gomez: With different moment.
Mario Gomez: And if you want to study this unbalanced system that is left after you move on, move a nucleus, then
Mario Gomez: Ppm reactions are actually very good Pro for that.
Mario Gomez: Especially because if you keep this picture in mind, then the state at which you measure your announces them in the end is going to be very similar to the state, it was
Mario Gomez: Inside your three body system and that gives you very useful information on devices then and looking into correlations for example.
Mario Gomez: So because we knew a guy that work with evil mothers with it with a bow and the first been applications.
Mario Gomez: We made a worst conceivable that
Mario Gomez: The to be system that remains really is not changed. So we will assume that it doesn't intervene, the reaction. These have been used before. And it's basically the main idea between a heavy find the analysis of these kind of reactions.
Mario Gomez: But because women. We know how to generate tree building models, we think we can do an improvement on the
Mario Gomez: On the measurements that have been done before, because in these measurements. Usually what people do is just get that respect to them and use some bright people is function and then adjust them put on the right energy and adjust the height so April's writer, but the thing is that
Mario Gomez: If you have a proper triple the model, you cannot do that, as I will let playing when we have some some data to to play with.
Mario Gomez: Before just a bit.
Mario Gomez: Of explanation of the theory basically the idea is the same one that we had before. We're going to do the cluster to continue
Mario Gomez: But now, our final system, obviously there's nucleus is going to be composed of two particles.
Mario Gomez: But if we assume that these that they these two particles are not going to interact
Mario Gomez: Then the relative distance is not going to be modified for the reaction. And then I in the same way that we integrative before to update this particular factor which can just eat the weight of the
Mario Gomez: Effective a wave function preparing Brooklyn and we find that we can express our cross section. I mean, abundance of the energy of the financial world sees them as a very simple some over all of the beans that are considered and all of a of a memento that consultant in beta calculation.
Mario Gomez: Which is a great company. So we basically we said, Okay, we have our three by three model for a little 11 that we have used and it cuts work. So let's see how well it does with some data that we have obtained from from the literature.
Mario Gomez: And we see that we do quite bodily
Mario Gomez: We are not able to reproduce the shape of experimental data here in the field. They that a test line corresponds to the to the results we get from our calculations.
Mario Gomez: But because we are dealing with a measurement of neutrons have a final look neutron of anything that is composed of neutral, they are bound to protect both
Mario Gomez: The resolution. It's like that. So you have to force our experimental resolution and that is the solid figure that we see here that we should be able to complete tuition.
Mario Gomez: And as you can see we are not doing quite well we are estimating below any deeper, we are under estimating the high energy one
Mario Gomez: And the thing is,
Mario Gomez: It's if we can understand this. If we compute the contribution of the wave and the wave in the States have 11 we find that it's like 60% of the way and that the percent of the way so we have too much as well.
Mario Gomez: But the problem is because we are using a 3D model, we cannot produce these these weight without making sacrifices. Basically, you can see that
Mario Gomez: You can view this as having a certain state as a setting in a focused way if the energy is very low, then you're
Mario Gomez: We function is going to favor the state and you're going to it allowed to wait and if you push your failure, then you can then you can have a reduce our reduce weight without so okay let's
Mario Gomez: Let's push the vs. Wade staggered and then we have to push the peewee lower because we still have one thing they say Manning entity.
Mario Gomez: And we'll get the mother that it also does really bad.
Mario Gomez: And it also goes beyond the model. And we thought was well so to speak with a failure. So we have to do something different and
Mario Gomez: There are, there were some experiments done with a heavy and targets that suggested that there could be at the way we stayed at around 1.5 MTV for really contain so we changed our model. And we do this estate.
Mario Gomez: And we found that with this estate, we managed to reproduce quite well the experimental data.
Mario Gomez: And you can see quite well why here in that they wait for it, wait remains basically at around 30% but a lot of the lot of the earthquake.
Mario Gomez: Way has gone to the way so we reduce the wave of localities, and we increase the the wave at high and ideas and then apparently experiment that resolution manages to smooth things out. It looks like sacred
Mario Gomez: So we managed to use the same, but we were not so happy with this model because there has been some dispute and where is the wave state is they're not so we try to modify our lithium letter model.
Mario Gomez: In a different way in which and this way a win by splitting the D wave and the MDS Weber State area is that the lithium nine has a spin, spin a three of my nose.
Mario Gomez: And then if you includes beings being directions in your model when you get that touristic split. And this means that if you have resumes are they for the T wave
Mario Gomez: The splitting of the restaurant as a results in broadening of the contribution for this way, we find that you can excrete also a state. So a part of a contribution of the as wait
Mario Gomez: No longer corresponds to this very last speaker, slow, slow, when it is, but instead is quite reviews. This is basically either with nothing no longer being an arbitrary state, but I am not going to go into much detail, but
Mario Gomez: Basically, as you can see, this also results in an improvement of up on this topic.
Mario Gomez: So we are very happy. We have our nice model for between 11 and we also find a different in a reaction that can be that can be starting with our model, which is the period reaction.
Mario Gomez: That because it Sanford was measured at quite low enemies either VPN was measured at the end he found 200 maybe this one was measure around six
Mario Gomez: So can we make them smaller work for these two very different than our lives. Well, let's see.
Mario Gomez: It Stanford, so we do something quite simple and standard, we use the devil, a pH of growth and we apply there as a spectator mother to have used before.
Mario Gomez: We that we obtain different a energy distributions, but because the resolution was more not so good because you have to mention neutrons, then the features of a energy solutions are quite the last two were as crucial.
Mario Gomez: But there was also a measurement of annual distributions that we can compare to our mothers and here we see that we have different models that we have applied.
Mario Gomez: The Petri MP for mothers were interviews for the VPN that P one is the models that interviews that include splitting and the speaker. Why else into the split is are we changed a bit the weights of the different way.
Mario Gomez: And you can see that P one P three MP five which is the mother with a big wave do quite well to reproduce experimental data while one athlete why before overestimate experimental data and we can see quickly. Why, if we look at the weight of the p, which
Mario Gomez: We see that the weight of the way is the around 30%
Mario Gomez: For the models of color and it's higher for a Muslim, though.
Mario Gomez: This makes perfect sense because when this experimental data will effective they removed the background to keep the restaurants that they found that around 0.5 0.6 Nev
Mario Gomez: These restaurants corresponds to a to a restaurant with a background can be contributing from all their contributions as wave and also from processes that no longer follow this a
Mario Gomez: This a directory PD description.
Mario Gomez: So basically you are just extracting the P wave a resonance contribution. This will give you the shape of a big wave. And then the magnitude is going to be here and by how much people if you have. So if you have a P waves of around 70% thing. It seems to work.
Mario Gomez: Then that's that's quite nice. So we have managed to get to obtain Lithium. Lithium models either p one, I have the five
Mario Gomez: That I was sleeping or the wave and both are able to reproduce two very different sets of experimental data. And that's something that we're quite satisfied with
Mario Gomez: Just to mention because I think I am, perhaps overextended myself and we want to make a PCP. We also applied these results for a value 14 PPM reaction. And here our model is not
Mario Gomez: When they enter distribution as we work to obtain the fusion of this evil thing within that is because they are very you a 14 with Samsung includes also
Mario Gomez: The exhibition of the value 12 go into the two plus and the one mind state.
Mario Gomez: For two plus we have been able to get a model that would get a triple decision that we can have a mother has both and probably that means that we are
Mario Gomez: overestimating the contributions to the pseudo process date and not to the one and not the one miners have Mason a the strength to high get a energies for every new thing.
Mario Gomez: And finally, PCBs copulate thankfully I it's going to be something that was shot.
Mario Gomez: Basically a PCP a reaction in which you kick
Mario Gomez: The cheetah nucleus with a proton, and then to put to acceptance go world. It has a game quite some interest you to this publication by 10 you to from last year.
Mario Gomez: Where they perform P2P PCP to get at the end a nickel 78 which is a W America with interesting and they found that for the PCP reaction they managed to populate the state that it was not like it for it to be.
Mario Gomez: So it means that there was a state that for some reason. It's not that clear for now it's more easily seen for TCP and P2P which van P2P which means that maybe you can use TCP to get new state and explore different properties of water.
Mario Gomez: So you you want to understand how PCP work, but I need something that is not that clear for now. So we did
Mario Gomez: A magical very simpler study of PTP in which we can see the three different processes. The first one is fabrica. So let's assume that the two programs that you're kicking out
Mario Gomez: strongly correlated in in the way that people consider equality pairs in high energy he trying to be reaction.
Mario Gomez: In this case, we assume that the external correlated means that they are going to have a high momentum.
Mario Gomez: But they are going to be facing each other so that the momentum of the bear is going to be small.
Mario Gomez: And they're your reaction can happen in two ways. The first the first way we call the recap, which they incoming proton go scene and kicks. One of the programs out of the air.
Mario Gomez: The other one, a yes remainder doesn't see the day coming proton, but because it has a lot a lot of momentum because it seems like it's going to go out as well.
Mario Gomez: And other possibilities that you are going to kick the pair, but you're not going to play it. So then the proton takes the parent as a whole different goals of the nucleus. And then the case because
Tight and I brought on it's not as stable affiliation.
Mario Gomez: We call this process, the knuckles and finally to just assume that the two platforms we are in the nucleus. They are not correlated. And you're just going to pick one and then you're going to pick up to kick another
Mario Gomez: And we call that sequential we compared the a day angle distribution that you have thing in the plane perpendicular to the to the beam.
Mario Gomez: To three different models we produced by using simple kinematic approximations on this.
Mario Gomez: Three distinctions. I have described before. And we found that the best agreement was obtained when we assume that they a two persons who are not correlated with these two groups of ours, also a tease.
Mario Gomez: Which is the angle of the problems with respect to the beam and the lambda which is a very bad words between the two brothers.
Mario Gomez: And the Sophia small is basically the angle in their perpendicular playing between two platforms such as this is the smallest angle between
Mario Gomez: Development. So if you have the three protons, you have a smallest angle A medium angle and allow the sample and we here we just focus on the smallest one.
Mario Gomez: We found that if we use our simple in America models for the reactions. In general, the best one was always the separation model.
Mario Gomez: So we didn't do so well for this era. The bangles. This could be because the model is magical and simple, and we are leaving things out. Also because
Mario Gomez: In the descriptions of a of a collisions perfect a signature model we assume the conditions to be in shell so that there was any conservation between the two colliding protons and
Mario Gomez: This doesn't have to be true. Inside the nucleus, because part of the momentum and the energy can be gone can be even to the rest of the new case.
Mario Gomez: But in general we have we found with whites are variants that the reaction happen sequentially.
Mario Gomez: Which, in a sense, it's a pity, because as we said the reaction is not sensitive to it. Correct. His parents, your drive correlations that that something very interesting to grow, but also it said says on
Mario Gomez: But to manage to rip to describe theoretically, this reaction which is currently what I am working to try and make predictions for experimental for the measurement of excited state that look later.
Mario Gomez: After that, preferably populated by a nuclear reaction to CP
Mario Gomez: With this I finished as a summary having to use you to ppl and P2P reactions.
Mario Gomez: With that, we have model with the fact that or something for Madison's we have extended based model to a reaction from a balmy and nuclear and we have found is that the
Mario Gomez: Baby and reactions do not seem to have a strong dependency on the thing with your new play against the train was found for number three actions.
Mario Gomez: But we're immune system we have developed a C's model fully public emulating that money is to reproduce ppl high energy some am PT a low ones.
Mario Gomez: And also we have gotten, at least not really successful description of 1314 PPM finally for peace treaty, we have use simple grammatical models to show that the reaction happen and we had a sequential collision of correlated problem.
Mario Gomez: And I think that, so I would like to thank my collaborators that have worked in different stages of
Mario Gomez: The results I helped representative here product issues have been co authors, but I have been procrastinating too much and I didn't have time to send them the presentation. So even want to
Mario Gomez: Make them part of something that they haven't been able to check and I also like to thank you for your attention, and now I will be open for questions.
James Smallcombe: Thank you very much. Marissa, so yeah.
James Smallcombe: As Mary said we now invite questions. So as I said at the start, please do go into that participants menu.
James Smallcombe: And find yourself the raise hand icon. So we don't all talk over one another, or if you don't have a microphone head down the chat window and get typing and I'll do my best to read that out. I see digital collapse.
James Smallcombe: Yes, everyone.
James Smallcombe: Joined the top on the work earlier in series. So if you're interested in the experimental side that P three p reaction. We've got a video on our website. And we have a question from Ragnar rock. Now please go ahead and ask your question. Okay.
Ragnar Stroberg: See if this works. Yeah, it's not that gets the video is not working. But can you hear me. Yes. Great. Okay. Thanks for the talk.
Ragnar Stroberg: I noticed in the first section you found that that you could get some delta s dependence and knockout bit based on the short distance imaginary part of the potential, which is the least constrains part
Ragnar Stroberg: Of the potential. So I kind of wonder how much damage, would you have to do to the imaginary part of short distances in order to get that slope.
Mario Gomez: So basically you have liked to really increase the
Mario Gomez: The, the magnetic part
Mario Gomez: Very a like in a very drastic way so you don't want to just increase the imaginary part.
Mario Gomez: Overall, because you are going to also affecting the day section.
Mario Gomez: For a for a week live on a nucleus. The problem that you have is that if you want to get a smaller quenching then you have to have a larger
Mario Gomez: Cross section.
Mario Gomez: Allegro section in this case for the for the part that is sensitive to the interior. Right. And to do that, then you would have to reduce your absorption
Mario Gomez: And there is no real
Mario Gomez: Like decent
Mario Gomez: sensible way of getting a reason of porn potential that
Mario Gomez: Produces a cross section that is going to be double or triple the values that we see here that is actually what you require to put the Quentin's to
Mario Gomez: To the band that you see from knockout so if you see one. If you go to, for example, the SEM a 23
Mario Gomez: And you have to go to 0.3 so that means after you have to double the cross section that you find using value which is which is the one that keeps the lowest to go there. So to do that you basically have two key last option.
Mario Gomez: And that's not reasonable.
Mario Gomez: So even if you are sensitive to the to the optical potentials, you're using the sensitivity pan that could be reasonable. I think is quite well contained in the values at the that are shown here.
Mario Gomez: You would expect.
Mario Gomez: Or even expect the reason our potential or a reasonable the PPM absorption to go beyond these funds.
Mario Gomez: Which means that you don't really get an agreement with the results for them.
Mario Gomez: Respond to the question. Like you would really have to put really unreasonable values of absorption of the Miami, but to get and even with not not
Ragnar Stroberg: Okay. And I guess you're also in these cases, assuming that the the shape of the imaginary part is just some would sex and with the
Weather
Mario Gomez: In this case,
Mario Gomez: In this case, I used to be for implementations
Mario Gomez: Of a different nature. We use the police humbled potentials with her.
Mario Gomez: For the potential between effective the matrix and nuclear Bay City, which means that basically they just follow the nuclear basically and the other one is the director of the session with the cycle optimization. So, for example, for the imaginary path.
Mario Gomez: At these high energy
Ragnar Stroberg: Really looks like a Saxon, but if you go
Mario Gomez: To lower energies. It is that to gain surface term. So it becomes more like the derivative section.
Ragnar Stroberg: Okay, thanks.
James Smallcombe: Okay. Do we have any other questions.
James Smallcombe: Yeah, Tom. Would you like to unmute yourself and go ahead
Toan Phuc: Hello Mario can you
Toan Phuc: Write. So I would like to ask about a k for the a b tree be B2B sequential naka
Yep.
Toan Phuc: Yep. Yeah. Yeah, this one. So I say that in your illustration, you show that in the trade scenario on of the nuclear acquire especially a separate so is any case that is the the two proton out is calculate spatially correlate nae nae protons being naka
Mario Gomez: So for this description that we here we need we base it on kinematics. So we just mobile Lutyens by looking at the moment. So we never consider the possibility of having nuclear close or far away. So in order to model the currency pairs, we assume that they would have
Mario Gomez: High a high a module from into that looking in opposite directions that they have added the momentum of zero.
Mario Gomez: And four ways sequential model, we use the yes the ocean distributions to assign the momentum. So for these models, we did not know if they are close or not.
Mario Gomez: If they have a moment among among themselves. You can expect them to be closely related. So they had a sense it's a way that they can sense the strong nuclear nuclear interaction.
Mario Gomez: But these these kinematic our mothers, they did not consider is positive correlation innocence.
Toan Phuc: Okay, thank you. So, another question is that i i know that CDC used to have a abilities to describe the two nuclear removal reactions. So I wonder why is the difficulty for for this case with TC or BCC.
Mario Gomez: For service, etc. So I would, I would have
Mario Gomez: Liked it because if you want to do. Si, si, si properly.
Mario Gomez: You want to have the interaction between the proton and the incoming proton and the to remove Napoleon's
Mario Gomez: Brothers. In this case, which means that you will meet a
Mario Gomez: Couple channel between three particles.
Mario Gomez: Now that exists, but it's quite heavy
Mario Gomez: And
Mario Gomez: Probably
Mario Gomez: An approximation like
Mario Gomez: Like a a DWI as everybody puts approximation. Good. We
Mario Gomez: More adequate because
Mario Gomez: What we find here is that the reaction that's capping that seemed to oversee a sequential reaction, which means that the two programs that you're that you're kicking out. I'm not really feeling each other and all the other one. So after the coalition. They don't see each other that much.
Mario Gomez: Which means that that description, like a VW a that usually at the end of the day after the collision does not include at least strongly interaction between the the plugins would be probably a reasonable a reasonable way to go.
Toan Phuc: Okay, I see. Thank you very much.
James Smallcombe: Okay.
James Smallcombe: If we have any other questions. If you aren't able to use the raise hand option I would welcome you. Just to unmute yourself now and go ahead
James Smallcombe: I don't see any further questions, I think well cool questions there and say thank you very much. Marissa for a fantastic talk
James Smallcombe: And before anyone runs off. I just want repeat my
James Smallcombe: will repeat my notice from the, from the start, which is we have another talk next week, but we have the end of daylight savings young UK
James Smallcombe: And for some viewers. I think we have a couple from Canada you I think get have a one week difference there. So double check your time zones for next week when we have
James Smallcombe: This Robledo talking about where's this exact title. I've lost his title, but it will be about optical dynamic and static shape there.
James Smallcombe: So please join us then. And also another note David Sharpe, would you like to make notes about the student talks.
David Sharp: Hi, James. Thanks. Yeah, just to reiterate that we're, we're looking for more participants for the students seminars.
David Sharp: Happening on Wednesday afternoons.
David Sharp: So the starters is just UK students. We have a lot of international listeners. So I just like to extend the invitation to
David Sharp: Colleagues abroad. Anyone who's going to need students, you'd like to
David Sharp: Who you think would benefit from participating and giving what is an International Seminar to a diverse group of people, please get in contact and my email addresses in the chat if anyone has any students who are interested, please get in touch and are arranged in that slot. Thanks.
David Sharp: Excellent.
James Smallcombe: So I don't think there are any other gnosis. So thank you everyone for joining us and final. Thank you. Tomorrow talk, you have a good week. Bye for now.