Investigations of nuclear chirality at iThemba LABS

doi:10.1007/s11467-023-1340-0

Frontiers of Physics

2024, Vol. 19

Issue (2): 24302 https://doi.org/10.1007/s11467-023-1340-0

本期目录

Investigations of nuclear chirality at iThemba LABS

R. A. Bark¹(

), E. A. Lawrie^1,², C. Liu³, S. Y. Wang³

¹. iThemba Laboratory for Accelerator Based Sciences, National Research Foundation, P.O. Box 722, Somerset-West 7129, South Africa
². Department of Physics, University of the Western Cape, Private Bag X17, 7535, Bellville, South Africa
³. Shandong Provincial Key Laboratory of Optical Astronomy and Solar-Terrestrial Environment, Institute of Space Sciences, Shandong University, Weihai 264209, China

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Abstract：

Progress in the studies of chirality in atomic nuclei at iThemba LABS is reviewed. New regions of chirality, around mass 80 and 190 have been discovered using the AFRODITE array, specifically in the nuclei ⁷⁴As, ^78,80,82Br, ⁸¹Kr, and ^193,194,198Tl. Many phenomena have been observed, including multiple chiral bands in the same nucleus, the coexistence of octupole correlations and nuclear chirality, and the coexistence of pseudo spin and nuclear chirality. The best example of chiral degeneracy to date was found in ¹⁹⁴Tl. The level scheme of ¹⁰⁶Ag has been revisited and interpreted in terms of two- and four-quasiparticle bands. Investigations using the particle-rotor model have shown that the fingerprints of chirality in the two-quasiparticle system only can occur in an idealised model description. For systems with a higher number of quasiparticles, the calculations showed that nuclear chirality can persist.

Key words： chirality high-spin states particle-rotor model

收稿日期: 2023-03-16 出版日期: 2023-09-26

Corresponding Author(s): R. A. Bark

引用本文:

. [J]. Frontiers of Physics, 2024, 19(2): 24302.
R. A. Bark, E. A. Lawrie, C. Liu, S. Y. Wang. Investigations of nuclear chirality at iThemba LABS. Front. Phys. , 2024, 19(2): 24302.

链接本文:

https://academic.hep.com.cn/fop/CN/10.1007/s11467-023-1340-0
https://academic.hep.com.cn/fop/CN/Y2024/V19/I2/24302

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Fig.7

Fig.8

Nucleus	Reaction(s)	Beam energy (MeV)	Target thickness (mg/cm²)	Events ( $× 109$ )	Refs.

Mass 80 region
⁷⁴As	⁷⁴Ge( $α$ ,p3n)	59, 63	2.9 + backing	1.9 $γ γ$	Xiao, et al. [19]
⁷⁸Br	⁷⁰Zn(¹²C,p3n)	60, 65	0.85	1.5 $γ γ$	Liu, et al. [20]
				0.16 p $γ γ$	Liu, et al. [20]
⁸⁰Br	⁷⁶Ge(¹¹B, $α$ 3n)	54	1.8 + backing	0.2 $γ γ$	Wang, et al. [21]
	⁷⁶Ge(⁷Li,2n)	35	0.2, 0.6 + backing	1.2 $γ γ$ $a)$	Wang, et al. [21]
⁸¹Kr	⁸²Se ( $α$ ,5n)	65, 68	0.4	1.5 $γ γ$	Mu, et al. [22]
⁸²Br	⁸²Se ( $α$ ,p3n)	65, 68	0.4	1.5 $γ γ$	Liu, et al. [23]
Mass 100 region
¹⁰⁶Ag	⁹⁰Zr (¹⁴N,4n)	71	17	3.4 $γ γ$	Lieder, et al. [24]
			0.7	0.4 $γ γ$	Lieder, et al. [24]
Mass 190 region
¹⁹³Tl	¹⁶⁰Gd(³⁷Cl,4n)	167	1.0		Ndayishimye, et al. [25]
	¹⁸¹Ta(¹⁸O,6n)	105	1.0	10.0 $γ γ$	Ndayishimye, et al. [25]
¹⁹⁴Tl	¹⁸¹Ta(¹⁸O,5n)	91, 93	Stacked 2 or 3 × 0.5	3.0 $γ γ$	Masiteng, et al. [10, 26]
	¹⁸¹Ta(¹⁸O,5n)	91	1.0 + backing	$γ γ$	Masiteng, et al. [27]
¹⁹⁸Tl	¹⁹⁷Au( $α$ ,3n)	40	13.0	$γ γ$	Lawrie, et al. [28, 29]
	¹⁹⁷Au( $α$ ,3n)	40	0.2	$e γ$ $b)$	Lawrie, et al. [28, 29]

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