Isomerism in the “south-east” of 132Sn and a predicted neutron-decaying isomer in 129Pd

Yuan, C, Liu, Z, Xu, F, Walker, PM, Podolyak, Z, Xu, C, Ren, ZZ, Ding, B, Liu, XY, Xu, HS, Zhang, YH, Zhou, XH and Zuo, W (2016) Isomerism in the “south-east” of 132Sn and a predicted neutron-decaying isomer in 129Pd Physics Letters B, 762. pp. 237-242.

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Abstract

Excited states in neutron-rich nuclei located south-east of 132Sn are investigated by shell-model calculations. A new shell-model Hamiltonian is constructed for the present study. The proton–proton and neutron–neutron interactions of the Hamiltonian are obtained through the existing CD-Bonn G matrix results, while the proton–neutron interaction across two major shells is derived from the monopole based universal interaction plus the M3Y spin–orbit force. The present Hamiltonian can reproduce well the experimental data available in this region, including one-neutron separation energies, level energies and the experimental B(E2)B(E2) values of isomers in 134,136,138Sn, 130Cd, and 128Pd. New isomers are predicted in this region, e.g. in 135Sn, 131Cd, 129Pd, 132,134In and 130Ag, in which almost no excited states are known experimentally yet. In the odd–odd 132,134In and 130Ag, the predicted very long E 2 life-times of the low-lying 5−5− states are discussed, demanding more information on the related proton–neutron interaction. The low-lying states of 132In are discussed in connection with the recently observed γ rays. The predicted 19/2−19/2− isomer in 129Pd could decay by both electromagnetic transitions and neutron emission with comparable partial life-times, making it a good candidate for neutron radioactivity, a decay mode which is yet to be discovered.

Item Type:	Article
Subjects :	Physics
Divisions :	Faculty of Engineering and Physical Sciences > Physics
Authors :	Authors Email ORCID Yuan, C UNSPECIFIED UNSPECIFIED Liu, Z UNSPECIFIED UNSPECIFIED Xu, F UNSPECIFIED UNSPECIFIED Walker, PM UNSPECIFIED UNSPECIFIED Podolyak, Z UNSPECIFIED UNSPECIFIED Xu, C UNSPECIFIED UNSPECIFIED Ren, ZZ UNSPECIFIED UNSPECIFIED Ding, B UNSPECIFIED UNSPECIFIED Liu, XY UNSPECIFIED UNSPECIFIED Xu, HS UNSPECIFIED UNSPECIFIED Zhang, YH UNSPECIFIED UNSPECIFIED Zhou, XH UNSPECIFIED UNSPECIFIED Zuo, W UNSPECIFIED UNSPECIFIED
Date :	November 2016
Identification Number :	https://doi.org/10.1016/j.physletb.2016.09.030
Copyright Disclaimer :	©2016 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.
Depositing User :	Symplectic Elements
Date Deposited :	10 Oct 2016 08:09
Last Modified :	10 Oct 2016 08:09
URI:	http://epubs.surrey.ac.uk/id/eprint/812349

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