DSAM lifetime measurements for the chiral bands in 194Tl

21st International School on Nuclear Physics and Applications & International Symposium on Exotic Nuclei

Masiteng, P.L.^1,2,3 ; Pasternak, A.A.^4 ; Lawrie, E.A.^1 ; Shirinda, O.^1 ; Lawrie, J.J.^1 ; Bark, R.A.^1 ; Bvumbi, S.P.^1,2,3 ; Kheswa, N.Y.^1 ; Lindsay, R.^2 ; Lieder, E.O.^1 ; Lieder, R.M.^1 ; Madiba, T.E.^1,2 ; Mullins, S.M.^1 ; Murray, S.H.T.^1 ; Ndayishimye, J.^1,5 ; Ntshangase, S.S.^1,6 ; Papka, P.^1,5 ; Sharpey-Schafer, J.F.^1,2

IThemba LABS, National Research Foundation, PO Box 722, Somerset West

7129, South Africa^1

University of the Western Cape, Private Bag X17, Bellville

7535, South Africa^2

University of Johannesburg, PO Box 524, Auckland Park, South Africa^3

A.F. Ioffe Physical-Technical Institute, St.-Petersburg

194021, Russia^4

Department of Physics, University of Stellenbosch, Private Bag X1, Matieland

7602, South Africa^5

Department of Physics, University of Cape Town, Private Bag, Rondebosch

7701, South Africa^6

关键词: Chiral bands;    Chiral symmetry;    Left handed;    Lifetime measurements;    Nuclear systems;    Right handed;    Rotational band;    Transition probabilities;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/724/1/012028/pdf
DOI  :  10.1088/1742-6596/724/1/012028

来源: IOP

【 摘 要 】

When a left-handed and a right-handed nuclear system form in angular momentum space, a pair of nearly degenerate rotational bands is observed. To identify chiral symmetry most important is to establish near-degeneracy not only in excitation energies of the partner bands, but also in their intra-band and inter-band B(M1) and B(E2) transition probabilities. This needs dedicated lifetime measurements. Such measurements were performed for four bands of194Tl. Two of these have very close near-degeneracy and form a prime candidate for best chiral pair. The lifetime measurements confirm the excellent near-degeneracy in this chiral pair.