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The European Physical Journal A
ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)
Abstract Volume 1 Issue 2 (1998) pp 125-135
nuclear structure: High spin states and evidence for octupole correlations in 117Xe
Z. Liu (1), X. Sun (1), X. Zhou (1), X. Lei (1), Y. Guo (1), Y. Zhang (1), X. Chen (1), H. Jin (1), Y. Luo (1), S.X. Wen (2), C.X. Yang (2), G.J. Yuan (2), G.S. Li (2), X.A. Liu (2), W.D. Luo (2), Y.S. Chen (2)
(1) Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
(2) China Institute of Atomic Energy, Beijing 102413, People's Republic of China
Received: 17 June 1997 / Revised version: 29 September 1997
Abstract: High-spin states of 117Xe were investigated by means of in-beam <Gamma>-ray spectroscopic techniques via the reaction of 28Si bombarding a 92Mo target at beam energies of 100-120 MeV. A positive-parity rotational band decaying into the yrast negative-parity band by a series of enhanced E1 transitions was observed for the first time, implying the existence of octupole correlations in 117Xe. The B(E1) values increase with spin. The <nu>d5/2 band was firmly established up to 27/2+ and the B(M1)/B(E2) ratios were extracted from the relative intensities of <Gamma>-rays in this band. The previously known <nu>h11/2 and <nu>g7/2 [413]5/2+ <alpha>=-1/2 bands were confirmed and extended up to high spins and two bandcrossings are observed in the latter at {\hslash}<omega>=0.33 and 0.44 MeV, respectively. The bandcrossings and configurations of these bands are discussed by TRS and CSM calculations. In a <Gamma>-<Gamma>-t measurement, the 11/2- and 7/2- levels were identified as two isomers with half-lives of 59.4±20 ns and 16.5±8.0 ns, respectively.
PACS: 21.10.Re Collective levels and giant resonances - 23.20.Lv Gamma transitions and level energies - 27.60.+j 90 \leqq A \leqq 149
Communicated by B. Herskind
Online publication: February 17, 1998
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