Proposal to the ISOLDE and Neutron Time-of-Flight Committee Evolution of quadrupole and octupole collectivity north-east of 132 Sn : the even Te and Xe isotopes October 5 , 2012

semanticscholar(2012)

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摘要
We propose to study excited states in isotopes north-east of the doubly-magic 132Sn by γ-ray spectroscopy following “safe” Coulomb excitation. The experiment aims to the determine B(E2) and B(E3) values to follow the evolution of quadrupole and octupole collectivity when going away from the shell closures at Z = 50 and N = 82. The B(E2, 0gs → 21 ) values in the even isotopes 138−144Xe have been measured at REX-ISOLDE and the systematic trend towards neutron-rich nuclei is well described even by an empirical Grodzins-type formula. An increasing dipole moment observed for 140,142Xe is interpreted as indirect signature of increasing octupole correlations peaking at N = 88. So far, no B(E3) values are known. In contrast to the Xe isotopes, the Te ones, in particular 136Te, are known for their notoriously irregular behaviour. In order to understand the nuclear structure also on a microscopic basis, the isotope 136Te with just one pair of protons and neutrons outside the doubly-magic core is a key nucleus in this region. In this proposal, we concentrate as first nucleus of the programme on the study of 142Xe. Requested shifts: [30] shifts, (split into [1] runs over [1] years)
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