NEAR-DEGENERATE ROTATIONAL BANDS IN THE Tl ISOTOPES

被引：1
|
作者：
Lawrie, E. A. [1 ,2 ]
Ndayishimye, J. [1 ,3 ]
Masiteng, P. L. [4 ]
Shirinda, O. [1 ,3 ]
机构：
[1] Natl Res Fdn, iThemba LABS, POB 722, ZA-7129 Somerset West, South Africa
[2] Univ Western Cape, Dept Phys & Astron, P Bag X17, ZA-7535 Bellville, South Africa
[3] Stellenbosch Univ, Dept Phys, P Bag X1, ZA-7602 Matieland, South Africa
[4] Univ Johannesburg, Dept Phys, POB 524, Auckland Pk, South Africa
来源：
ACTA PHYSICA POLONICA B PROCEEDINGS SUPPLEMENT | 2018年 / 11卷 / 01期
基金：
新加坡国家研究基金会;
关键词：
CHIRAL BANDS; EXCITATIONS;
D O I：
10.5506/APhysPolBSupp.11.81
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Sets of near-degenerate rotational bands built on configurations involving pi h(9/2) particle and nu i(13/2) holes were observed in the neighbouring Tl-193,Tl-194 isotopes. Such sets of bands, involving particle and hole configurations and occurring in nuclei with triaxial shape, are caused by chiral symmetry formed in angular momentum space. Each nuclear chiral system is expected to generate a pair of near-degenerate partner bands. However, several sets of three partner bands were observed in these Tl isotopes, raising questions whether one or two chiral systems are formed, and which two bands are partners in the chiral pair. Many-particle-rotor model calculations reproduce well the features of the observed negative-parity bands in Tl-193,Tl-194 and support the suggested chiral geometry of the angular momenta.
引用
收藏
页码：81 / 87
页数：7
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