High-spin structures in the 139Pr nucleus

E. Y. Yeoh (杨韵颐), S. J. Zhu (朱胜江), J. G. Wang (王建国), Z. G. Xiao (肖志刚), M. Zhang (张明), W. H. Yan (闫威华), R. S. Wang (王仁生), Q. Xu (徐强), X. G. Wu (吴晓光), C. Y. He (贺创业), G. S. Li (李广生), Y. Zheng (郑云), C. B. Li (李聪博), X. P. Cao (曹雪朋), S. P. Hu (胡世鹏), S. H. Yao (姚顺和), and B. B. Yu (于蓓蓓)
Phys. Rev. C 85, 064322 – Published 22 June 2012

Abstract

Background: 139Pr is located in a transitional region of neutron number close to the N=82 shell. The study of its high-spin states and collective bands is important for systematically understanding the nuclear structural characteristics in this region.

Purpose: To investigate the high-spin levels and to search for oblate bands in 139Pr.

Methods: The high-spin states of 139Pr have been studied via the reaction 124Sn(19F,4n) at a beam energy of 80 MeV. The experiment was carried out at the HI-13 Tandem Accelerator at the China Institute of Atomic Energy (CIAE). The data analysis was done by using the γ-γ coincidence method.

Results: The level scheme of 139Pr has been expanded with spin up to 45/2. A total of 39 new levels and 45 new transitions are identified. Four collective band structures at high-spin states have been newly established. From systematic analysis, one of the bands is proposed as a double decoupled band; two bands are proposed as oblate bands with γ60; another band is suggested as an oblate-triaxial band with γ90. The other characteristics for these bands are discussed.

Conclusions: A new level scheme in 139Pr has been established and the collective bands at high spin have been identified. The result shows that the strong oblate shape-driving effect is caused by neutrons at the high-spin states in 139Pr.

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  • Received 13 May 2012

DOI:https://doi.org/10.1103/PhysRevC.85.064322

©2012 American Physical Society

Authors & Affiliations

E. Y. Yeoh (杨韵颐)1, S. J. Zhu (朱胜江)1,*, J. G. Wang (王建国)1,2, Z. G. Xiao (肖志刚)1, M. Zhang (张明)1, W. H. Yan (闫威华)1, R. S. Wang (王仁生)1, Q. Xu (徐强)1, X. G. Wu (吴晓光)3, C. Y. He (贺创业)3, G. S. Li (李广生)3, Y. Zheng (郑云)3, C. B. Li (李聪博)3, X. P. Cao (曹雪朋)3, S. P. Hu (胡世鹏)3, S. H. Yao (姚顺和)3, and B. B. Yu (于蓓蓓)3

  • 1Department of Physics, Tsinghua University, Beijing 100084, People's Republic of China
  • 2Institute of Modern Physics, Chinese Academy of Sciences, Lanzhou 730000, People's Republic of China
  • 3China Institute of Atomic Energy, Beijing 102413, People's Republic of China

  • *zhushj@mail.tsinghua.edu.cn

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Vol. 85, Iss. 6 — June 2012

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