High-spin states in 156Yb and structure evolutions at large angular momenta in even-A Yb isotopes

被引：13

作者：

Li, Z. Y. ^{[1
,2
]}

Hua, H. ^{[1
,2
]}

Wang, S. Y. ^{[1
,2
]}

Meng, J. ^{[1
,2
]}

Li, Z. H. ^{[1
,2
]}

Li, X. Q. ^{[1
,2
,5
]}

Xu, F. R. ^{[1
,2
]}

Liu, H. L. ^{[1
,2
]}

Zhang, S. Q. ^{[1
,2
]}

Ye, Y. L. ^{[1
,2
]}

Jiang, D. X. ^{[1
,2
]}

Zheng, T. ^{[1
,2
]}

Ma, L. Y. ^{[1
,2
]}

Lu, F. ^{[1
,2
]}

Fan, F. Y. ^{[1
,2
]}

Han, L. Y. ^{[1
,2
]}

Wang, H. ^{[1
,2
]}

Xiao, J. ^{[1
,2
]}

Chen, D. ^{[1
,2
]}

Fang, X. ^{[1
,2
]}

Lou, J. L. ^{[1
,2
]}

Zhou, S. G. ^{[3
,4
]}

Zhu, L. H. ^{[5
]}

Wu, X. G. ^{[5
]}

Li, G. S. ^{[5
]}

He, C. Y. ^{[5
]}

Liu, Y. ^{[5
]}

Li, X. Q. ^{[1
,2
,5
]}

Hao, X. ^{[5
]}

Pan, B. ^{[5
]}

Li, L. H. ^{[5
]}

机构：

[1] Peking Univ, Sch Phys, Beijing 100871, Peoples R China

[2] Peking Univ, State Key Lab Nucl Phys & Technol, Beijing 100871, Peoples R China

[3] Chinese Acad Sci, Inst Theoret Phys, Beijing 100080, Peoples R China

[4] Natl Lab Heavy Ion Accelerator, Ctr Theoret Nucl Phys, Lanzhou 730000, Peoples R China

[5] China Inst Atom Energy, Beijing 102413, Peoples R China

来源：

PHYSICAL REVIEW C | 2008年 / 77卷 / 06期

关键词：

D O I：

10.1103/PhysRevC.77.064323

中图分类号：

O57 [原子核物理学、高能物理学];

学科分类号：

070202 ;

摘要：

High-spin states of Yb-156 have been studied via the Sm-144(O-16,4n)Yb-156 fusion-evaporation reaction at beam energy 102 MeV. The positive-parity yrast band and negative-parity cascade have been extended up to higher-spin states, respectively. In the present work, the negative-parity sequence above the 25(-) state was found to be irregular and fragment into many parallel branches. This pattern may related to the excitation from the nucleon in the Z=64,N=82 core. The characteristics of alignment plot and E-GOS curve for the positive-parity yrast sequence in Yb-156 indicate that this nucleus may undergo an evolution from quasivibrational to quasirotational structure with increasing angular momentum. Based on a systematic summary of the available experimental alignments for the even-A Yb-156,Yb-158,Yb-160,Yb-162,Yb-164 isotopes, the structural evolutions induced by the increase in angular momentum, as well as by the change in neutron numbers, in these even-A Yb isotopes have been discussed in comparison with the cranked Woods-Saxon-Strutinsky calculations by means of total-Routhian-surface (TRS) methods.

引用

页数：9

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