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

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; Daniel, A. V.; Donangelo, R.; Ma, W. C.

doi:10.1142/s0218301321500373

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

Journal Article · Thu Jun 03 00:00:00 EDT 2021 · International Journal of Modern Physics E

DOI:https://doi.org/10.1142/s0218301321500373· OSTI ID:1808155

Luo, Y. X. ^[1]; Rasmussen, J. O. ^[2]; Hamilton, J. H. ^[3]; Ramayya, A. V. ^[3]; Wang, E. H. ^[3]; Frauendorf, S. ^[4]; Liang, W. Y. ^[5]; Jiao, C. F. ^[5]; Wu, Q. ^[5]; Liu, H. L. ^[5]; Xu, F. R. ^[5]; Liu, Y. X. ^[6]; Sun, Y. ^[7]; Hwang, J. K. ^[3]; Liu, S. H. ^[8]; Zhu, S. J. ^[9]; Brewer, N. T. ^[10]; Lee, I. Y. ^[11]; Ter-Akopian, G. M. ^[12]; Oganessian, Yu ^[12] more »

Vanderbilt Univ., Nashville, TN (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
Vanderbilt Univ., Nashville, TN (United States)
Univ. of Notre Dame, IN (United States); Inst. für Strahlenphysik, Dresden (Germany)
Peking Univ., Beijing (China)
Huzhou Teachers College (China)
Shanghai Jiao Tong Univ. (China)
Vanderbilt Univ., Nashville, TN (United States); Univ. of Kentucky, Lexington, KY (United States)
Vanderbilt Univ., Nashville, TN (United States); Tsinghua Univ., Beijing (China)
Vanderbilt Univ., Nashville, TN (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
JINR, Dubna (Russia)
Vanderbilt Univ., Nashville, TN (United States); JINR, Dubna (Russia)
Facultad de Ingenieria, Montevideo (Uruguay)
Mississippi State Univ., Mississippi State, MS (United States)

Collective rotational bands were observed for the first time in neutron-rich odd–odd ¹⁴²La by means of γ-γ-γ and γ-γ-γ-γ coincidence measurements of prompt fission γ rays from ²⁵²Cf using multi-detector array Gammasphere. Similarity between the yrast band of ¹⁴²La and those of neighboring ¹⁴⁴La, ¹⁴⁴Ce was found and interpreted as quasiparticle excitations. Here, 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 ¹⁴²La by the TRS model calculations. The band-crossing observed in the yrast band of ¹⁴²La was interpreted to be caused by alignment of the (h_11/2)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 ¹⁴²La, alignments of the (i_13/2)² neutron pair were found to be responsible for the band-crossing of the yrast band in the neighboring even-N ¹⁴³La, and triaxial degree of freedom was found to play a more significant role than octupole deformations in the nucleus, although its β₃ values deduced are large.

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Research Organization:: Vanderbilt Univ., Nashville, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC); National Natural Science Foundation of China (NSFC); Special Program of Higher Education Science Foundation; Russian Foundation for Basic Research

Grant/Contract Number:: FG02-88ER40407; AC02-05CH11231; FG02-95ER40934; AC05-00OR22725; AC52-07NA27344; FG02-95ER40939; 11175095; 2010000211007; 11235001; 11320101004; 11305059; 11275063; 11275068; 1113500511075103; 11-02-12050; 11-02-12066

OSTI ID:: 1808155

Journal Information:: International Journal of Modern Physics E, Vol. 30, Issue 05; ISSN 0218-3013

Publisher:: World ScientificCopyright Statement

Country of Publication:: United States

Language:: English

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72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
142La
143La
252Cf
γ-γ-γ and γ-γ-γ-γ coincidence measurements
Gammasphere
rotational band
spin/parity
TRS calculation
reflection-asymmetry
octupole deformation
triaxial deformation
band-crossing
rotational alignment

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

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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