Absence of paired crossing in the positive parity bands of Cs-124

作者：Singh A K; Basu A; Nag Somnath; Huebel H; Domscheit J; Ragnarsson I; Al Khatib A; Hagemann G B; Herskind B; Elema D R; Wilson J N; Clark R M; Cromaz M; Fallon P; Gorgen A; Lee I Y; Ward D; Ma W C

来源：PHYSICAL REVIEW C, 2018, 97(2): 024323.

DOI：10.1103/PhysRevC.97.024323

High-spin states in Cs-124 were populated in the Ni-64(Ni-64, p3n) reaction and the Gammasphere detector array wasused tomeasure gamma-ray coincidences. Both positive-and negative-parity bands, including bands with chiral configurations, have been extended to higher spin, where a shape change has been observed. The configurations of the bands before and after the alignment are discussed within the framework of the cranked Nilsson-Strutinsky model. The calculations suggest that the nucleus undergoes a shape transition from triaxial to prolate around spin I similar or equal to 22 of the positive-parity states. The alignment gain of 8 (h) over bar, observed in the positive-parity bands, is due to partial alignment of several valence nucleons. This indicates the absence of band crossing due to paired nucleons in the bands.

• 出版日期2018-2-20