First observation of collective rotational bands in neutron-rich 142La and the study of octupole/triaxial deformations in 142,143La-Reference-Cited by-同舟云学术

First observation of collective rotational bands in neutron-rich 142La and the study of octupole/triaxial deformations in 142,143La

Published:2021-05 Issue:05 Volume:30 Page:2150037
ISSN:0218-3013
Container-title:International Journal of Modern Physics E
language:en
Short-container-title:Int. J. Mod. Phys. E

Author:

Luo Y. X.¹²,Rasmussen J. O.²³,Hamilton J. H.¹,Ramayya A. V.¹,Wang E. H.¹,Frauendorf S.⁴⁵,Liang W. Y.⁶,Jiao C. F.⁶,Wu Q.⁶,Liu H. L.⁶,Xu F. R.⁶,Liu Y. X.⁷,Sun Y.⁸,Hwang J. K.¹,Liu S. H.¹⁹,Zhu S. J.¹¹⁰,Brewer N. T.¹¹¹,Lee I. Y.²,Ter-Akopian G. M.¹²,Oganessian Yu.¹²,Daniel A. V.¹¹²,Donangelo R.¹³,Ma W. C.¹⁴

Affiliation:

1. Physics Department, Vanderbilt University, Nashville, TN 37235, USA

2. Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA

3. Department of Chemistry, U.C. Berkeley, Berkeley, CA 94720, USA

4. Department of Physics, University of Notre Dame, Notre Dame IN 46556, USA

5. Institut für Strahlenphysik, FZD-Rossendorf, Postfach 510119, D-01314 Dresden, Germany

6. School of Physics, Peking University, Beijing 100871, P. R. China

7. School of Science, Huzhou Teachers College, Huzhou 31300, P. R. China

8. Department of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai, P. R. China

9. Department of Chemistry, University of Kentucky, Lexington, Kentucky 40505, USA

10. Department of Physics, Tsinghua University, Beijing 100084, P. R. China

11. Physics Division, Oak Ridge National Laboratory, Tennessee 37830, USA

12. Flerov Laboratory for Nuclear Reactions, JINR, Dubna, Russia

13. Facultad de Ingenieria, C.C.30, 11300 Montevideo, Uruguay

14. Mississippi State University, Drawer 5167, Mississippi State, MS 39762, USA

Abstract

Collective rotational bands were observed for the first time in neutron-rich odd–odd [Formula: see text]La by means of [Formula: see text]-[Formula: see text]-[Formula: see text] and [Formula: see text]-[Formula: see text]-[Formula: see text]-[Formula: see text] coincidence measurements of prompt fission [Formula: see text] rays from [Formula: see text]Cf using multi-detector array Gammasphere. Similarity between the yrast band of [Formula: see text]La and those of neighboring [Formula: see text]La, [Formula: see text]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 [Formula: see text]La by the TRS model calculations. The band-crossing observed in the yrast band of [Formula: see text]La was interpreted to be caused by alignment of the (h[Formula: see text])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 [Formula: see text]La, alignments of the (i[Formula: see text])2 neutron pair were found to be responsible for the band-crossing of the yrast band in the neighboring even-N [Formula: see text]La, and triaxial degree of freedom was found to play a more significant role than octupole deformations in the nucleus, although its [Formula: see text] values deduced are large.

Funder

U.S. DOE

National Natural Science Foundation of China

Special Program of Higher Education Science Foundation

NNSF of China

SJTU in Shanghai NNSF of China

973 Program of China

Russian Foundation for Basic Research

Publisher

World Scientific Pub Co Pte Lt

Subject

General Physics and Astronomy,Nuclear and High Energy Physics