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

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

H. Naïdja, F. Nowacki, B. Bounthong, M. Czerwiński, T. Rząca-Urban, T. Rogiński, W. Urban, J. Wiśniewski, K. Sieja, A. G. Smith, J. F. Smith, G. S. Simpson, I. Ahmad, and J. P. Greene

Phys. Rev. C 95, 064303 – Published 2 June 2017

Abstract

New excited states in ${}^{142}{Ba}$ and ${}^{144}{Ce}$ are investigated by means of prompt $γ -ray$ spectroscopy of the radiation following spontaneous fission of ${}^{252}{Cf}$ . 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. The presence of collectivity in the $N = 86$ isotones is confirmed by clear signatures of soft triaxial $γ$ bands in both nuclei.

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Received 24 March 2017

DOI:https://doi.org/10.1103/PhysRevC.95.064303

Physics Subject Headings (PhySH)

Collective levels Electromagnetic transitions Fission Nuclear structure & decays

90 ≤ A ≤ 149

Nuclear Physics

Authors & Affiliations

H. Naïdja^1,2, F. Nowacki¹, B. Bounthong¹, M. Czerwiński³, T. Rząca-Urban³, T. Rogiński³, W. Urban³, J. Wiśniewski³, K. Sieja¹, A. G. Smith⁴, J. F. Smith⁴, G. S. Simpson⁵, I. Ahmad⁶, and J. P. Greene⁶

¹Université de Strasbourg, CNRS, IPHC UMR 7178, F-67000 Strasbourg, France
²Université Constantine 1, LPMS, Route Ain El Bey 25000, Constantine, Algeria
³Faculty of Physics, University of Warsaw, Ulica Pasteura 5, PL-02-093 Warsaw, Poland
⁴Department of Physics and Astronomy, The University of Manchester, M13 9PL Manchester, United Kingdom
⁵LPSC, Université Joseph Fourier Grenoble 1, CNRS/IN2P3, Institut National Polytechnique de Grenoble, F-38026 Grenoble Cedex, France
⁶Argonne National Laboratory, Argonne, Illinois 60439, USA

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Vol. 95, Iss. 6 — June 2017

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Physical Review C

covering nuclear physics

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

H. Naïdja, F. Nowacki, B. Bounthong, M. Czerwiński, T. Rząca-Urban, T. Rogiński, W. Urban, J. Wiśniewski, K. Sieja, A. G. Smith, J. F. Smith, G. S. Simpson, I. Ahmad, and J. P. Greene

Phys. Rev. C 95, 064303 – Published 2 June 2017

Abstract

Physics Subject Headings (PhySH)

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Physical Review C

covering nuclear physics

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

H. Naïdja, F. Nowacki, B. Bounthong, M. Czerwiński, T. Rząca-Urban, T. Rogiński, W. Urban, J. Wiśniewski, K. Sieja, A. G. Smith, J. F. Smith, G. S. Simpson, I. Ahmad, and J. P. Greene

Phys. Rev. C 95, 064303 – Published 2 June 2017

Abstract

Physics Subject Headings (PhySH)

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