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- Title
First observation of collective rotational bands in neutron-rich 142La and the study of octupole/triaxial deformations in 142,143La.
- Authors
Luo, Y. X.; Rasmussen, J. O.; Hamilton, J. H.; Ramayya, A. V.; Wang, E. H.; Frauendorf, S.; Liang, W. Y.; Jiao, C. F.; Wu, Q.; Liu, H. L.; Xu, F. R.; Liu, Y. X.; Sun, Y.; Hwang, J. K.; Liu, S. H.; Zhu, S. J.; Brewer, N. T.; Lee, I. Y.; Ter-Akopian, G. M.; Oganessian, Yu.
- Abstract
Collective rotational bands were observed for the first time in neutron-rich odd–odd 1 4 2 La by means of γ - γ - γ and γ - γ - γ - γ coincidence measurements of prompt fission γ rays from 2 5 2 Cf using multi-detector array Gammasphere. Similarity between the yrast band of 1 4 2 La and those of neighboring 1 4 4 La, 1 4 4 Ce was found and interpreted as quasiparticle excitations. PES calculations suggested triaxial deformation for the ground state of 142La. Considerable triaxial and near zero octupole deformations were deduced for the yrast band of 1 4 2 La by the TRS model calculations. The band-crossing observed in the yrast band of 1 4 2 La was interpreted to be caused by alignment of the (h 1 1 / 2 )2 proton pair, and the crossing frequency was best reproduced by the TRS calculations taking into account triaxial deformations. In contrast to the interpretations for the band crossing of 1 4 2 La, alignments of the (i 1 3 / 2 )2 neutron pair were found to be responsible for the band-crossing of the yrast band in the neighboring even-N 1 4 3 La, and triaxial degree of freedom was found to play a more significant role than octupole deformations in the nucleus, although its β 3 values deduced are large.
- Subjects
DEGREES of freedom; COINCIDENCE
- Publication
International Journal of Modern Physics E: Nuclear Physics, 2021, Vol 30, Issue 5, pN.PAG
- ISSN
0218-3013
- Publication type
Article
- DOI
10.1142/S0218301321500373