期刊
PHYSICS LETTERS B
卷 760, 期 -, 页码 273-278出版社
ELSEVIER
DOI: 10.1016/j.physletb.2016.06.065
关键词
Neutron induced fission; Gamma spectroscopy; Nuclear state lifetime; Large Ge array; Particle-core couplings
资金
- Italian Istituto Nazionale di Fisica Nucleare
- Polish National Science Centre [2014/14/M/ST2/00738, 2013/08/M/ST2/00257]
- UK Science and Technology Facilities Council
- UK National Measurement Office
- German BMBF [05P12RDNUP]
- Spanish MINECO [FPA2013-41267-P]
- NuPNET-FATIMA [PRI-PIMNUP-2011-1338]
- Science and Technology Facilities Council [ST/G000751/1, ST/G000751/1 NuSTAR, ST/L005743/1] Funding Source: researchfish
- STFC [ST/G000751/1, ST/L005743/1] Funding Source: UKRI
The gamma-ray decay of excited states of the one-valence-proton nucleus Sb-133 has been studied using cold-neutron induced fission of U-235 and Pu-241 targets, during the EXILL campaign at the ILL reactor in Grenoble. By using a highly efficient HPGe array, coincidences between gamma-rays prompt with the fission event and those delayed up to several tens of microseconds were investigated, allowing to observe, for the first time, high-spin excited states above the 16.6 mu s isomer. Lifetimes analysis, performed by fast-timing techniques with LaBr3(Ce) scintillators, revealed a difference of almost two orders of magnitude in B(M1) strength for transitions between positive-parity medium-spin yrast states. The data are interpreted by a newly developed microscopic model which takes into account couplings between core excitations (both collective and non-collective) of the doubly magic nucleus Sn-132 and the valence proton, using Skyrme effective interaction in a consistent way. The results point to a fast change in the nature of particle-core excitations with increasing spin. (C) 2016 The Authors. Published by Elsevier B.V. This is an open access article under the CC BY license.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据