SEARCH FOR THE CHIRAL NUCLEI IN A∼80 MASS REGION

Abstract

Excited states of 80 Br have been investigated via the 76 Ge(11 B, α3n) re-October 9, 2012 23:7 WSPC-Proceedings Trim Size: 9in x 6in Wang-Shouyu 240 action and a new ∆I = 1 band has been identified which resides ∼ 400 keV above the yrast band. Based on the experimental results, a chiral character of the two bands within the πg 9/2 ⊗ νg 9/2 configuration is proposed, which provides the first evidence for chirality in the A ∼ 80 mass region.

Recent progress in multiple chiral doublet bands

“…Very recently, a new pair of chiral doublet bands with the πg 7/2 h 11/2 ⊗ νh 11/2 configuration was identified in 135 Nd [53], which is the isotone of 133 Ce. The new ob-served chiral doublet bands together with the previously known chiral bands with the πh 2 11/2 ⊗ νh 11/2 configuration [20] constituted a new example of MχD bands. ) configuration [8] were respectively reported by the two different groups.…”

“…In this section, our attempt is to provide an overview of experimental findings of MχD. In 2013, two distinct sets of chiral doublet bands based on the πh 2 11/2 ⊗νh −1…”

“…One is MχD bands with the distinct configurations that differ from each other in their triaxial deformations and configurations. For example, two distinct chiral doublet bands based on the configurations πh 2 11/2 ⊗ νh 11/2 and πg 7/2 h 11/2 ⊗ νh 11/2 in 133 Ce [28]. The second is MχD bands with the identical configuration.…”

“…To test the theoretical prediction of chirality in atomic nuclei, much effort has been devoted to further exploring this interesting phenomenon. So far, such chiral doublet bands have been reported in the A ∼ 80 [2][3][4], 100 [5][6][7][8][9][10][11][12], 130 [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29], and 190 [30][31][32][33][34][35][36] mass regions of the nuclear chart. For details, see recent reviews on nuclear chirality and related topics [37][38][39][40][41][42][43][44][45] or data tables [46].…”

Studies of chirality in the mass 80, 100 and 190 regions

“…In Wang et al, 5 a pair of bands, assigned to the πg 9/2 ⊗ νg 9/2 configuration, were identified as the first examples of chirality in the mass 80 region. This programme has now been extended by a recent experiment to the study 78 Br, which is reported in detail in another talk at this meeting.…”