EPJ Web of Conferences
Volume 107, 2016International Conference on Nuclear Structure and Related Topics (NSRT15)
|Number of page(s)||4|
|Section||Nuclear Spectroscopy – Experiment and Theory|
|Published online||19 January 2016|
Isomers and oblate collectivity at high spin in neutron-rich Pt isotopes
UM-DAE Centre for Excellence in Basic Sciences, Mumbai 400098, India
Published online: 19 January 2016
Isomers and high-spin structures with rotation-aligned oblate configurations have been studied in several Pt isotopes. The 12+ states in the even Pt isotopes from 192–198Pt are found to be metastable, and have (i13/2)2 neutron character. The progression of E2 transition probabilities from the 12+ to 10+ states across the Pt isotopic chain implies reduction in collectivity, followed by an abrupt decrease at N=120 (198Pt). This behavior is quite distinct from the gradual decrease of B(E2) values near the respective ground states. A large contribution from aligned angular momentum, to the rotational sequences built on the 12+ states, is visible. This is due to the relatively small crossing frequencies for nucleons in low-Ω orbitals at oblate deformation in comparison to higher values for prolate shapes. As a result, oblate rotation is found to be increasingly favored for higher neutron numbers.
© Owned by the authors, published by EDP Sciences, 2016
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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