Octupole Nuclei
The region of the periodic chart which has shown the best evidence
for octupole instability in the nuclear ground state is around
Z = 88-90 and N around 134.
These nuclei have low-lying negative parity states and relatively
strong B(E1) values for the transitions between the bands of
opposite parity; in the case of 226Ra large B(E3)
values have been measured consistent with its interpretation as
a rotating pear shape.
The very inaccessibility of these
far-from-stability nuclei has, however, meant that there are large gaps in our
knowledge of octupole effects in heavy nuclei. Complete measurements
of the high-spin behaviour of the yrast octupole band only exist
for the isotopes of Th. For the Ra isotopes such measurements are
available for the weakly quadrupole coupled 218,220Ra and the
strongly coupled 226Ra. There is only a limited amount of data
on 224Ra and virtually no information exists for 222Ra.
The U isotopes with N around 132 are predicted to have the largest
octupole correlations,
but there is no information about the low
lying structure of these nuclei.
Highlights of Recent Results
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First Identification of Gamma Decay fron U-226
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Research carried out at Jurosphere
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Studies of Octupole Nuclei
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Search for Hyperdeformation in Uranium Isotopes
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