New excitations in Ba142 and Ce144: Evolution of γ bands in the N=86 isotones

Naidja, H.; Nowacki, F.; Bounthong, B.; Czerwinski, M.; Rzaca-Urban, T.; Roginski, T.; Urban, W.; Wisniewski, J.; Sieja, K.; Smith, A. G.; Smith, J. F.; Simpson, G. S.; Ahmad, I.; Greene, J. P.

doi:10.1103/PhysRevC.95.064303

New excitations in ${}^{142}{Ba}$ and ${}^{144}{Ce}$ : Evolution of $γ$ bands in the $N = 86$ isotones

Journal Article · Fri Jun 02 00:00:00 EDT 2017 · Physical Review C

DOI:https://doi.org/10.1103/PhysRevC.95.064303· OSTI ID:1364617

Naidja, H. ^[1]; Nowacki, F. ^[2]; Bounthong, B. ^[2]; Czerwinski, M. ^[3]; Rzaca-Urban, T. ^[3]; Roginski, T. ^[3]; Urban, W. ^[3]; Wisniewski, J. ^[3]; Sieja, K. ^[2]; Smith, A. G. ^[4]; Smith, J. F. ^[4]; Simpson, G. S. ^[5]; Ahmad, I. ^[6]; Greene, J. P. ^[6]

Univ. de Strasbourg, Strasbourg (France); Univ. Constantine, Constantine (Algeria)
Univ. de Strasbourg, Strasbourg (France)
Univ. of Warsaw, Warsaw (Poland)
The Univ. of Manchester, Manchester (United Kingdom)
Institut National Polytechnique de Grenoble, Grenoble Cedex (France)
Argonne National Lab. (ANL), Argonne, IL (United States)

New excited states in ¹⁴²Ba and ¹⁴⁴Ce are investigated by means of prompt γ-ray spectroscopy of the radiation following spontaneous fission of ²⁵²Cf. Measurements of angular correlations and the observed branchings allowed the assignment of spins and parities with confidence. The new measurements are reinforced by shell-model calculations where energy levels, electric transitions, and magnetic moments are consistent with experimental data. Lastly, the presence of collectivity in the N = 86 isotones is confirmed by clear signatures of soft triaxial γ bands in both nuclei.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States)

Sponsoring Organization:: Polish National Science Centre; USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26)

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1364617

Journal Information:: Physical Review C, Journal Name: Physical Review C Journal Issue: 6 Vol. 95; ISSN PRVCAN; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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