$\ensuremath{\gamma}$-ray spectroscopy of neutron-deficient ${}^{123}$Ce

$γ$ -ray spectroscopy of neutron-deficient $^{123}$ Ce

J. F. Smith, L. J. Angus, E. S. Paul, C. J. Chiara, M. P. Carpenter, H. J. Chantler, P. T. W. Choy, C. N. Davids, M. Devlin, D. B. Fossan, S. J. Freeman, R. V. F. Janssens, N. S. Kelsall, T. Koike, D. R. LaFosse, D. G. Sarantites, D. Seweryniak, K. Starosta, R. Wadsworth, and A. N. Wilson

Phys. Rev. C 86, 034303 – Published 4 September 2012

Abstract

Excited states have been identified in the very neutron-deficient $Z = 58$ nucleus $^{123}$ Ce. This is the most neutron-deficient odd- $A$ cerium isotope in which excited states have been identified. The states have been unambiguously assigned to $^{123}$ Ce by detecting de-excitation $γ$ rays in coincidence with evaporated charged particles and neutrons. Three rotational bands, each consisting of at least eight $E 2$ transitions, have been observed. The bands have tentatively been assigned to be based on neutrons in $g_{7 / 2}$ and $h_{11 / 2}$ orbitals. Two of the bands have been assigned to be signature partners, although no interband transitions have been observed. The aligned angular momenta of the bands have been studied in comparison with neighboring nuclei and with the results of Woods-Saxon cranking calculations. Observation of the deformation-dependent $π {(h_{11 / 2})}^{2}$ quasiparticle alignment at 0.36 MeV/ $ℏ$ in each of the bands suggests a quadrupole deformation of $β_{2} ≃ 0.3$ , in good agreement with theoretical predictions for the suggested possible configuration assignments.

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Received 23 May 2012

DOI:https://doi.org/10.1103/PhysRevC.86.034303

Authors & Affiliations

J. F. Smith^1,2,*, L. J. Angus^1,2, E. S. Paul³, C. J. Chiara^4,†, M. P. Carpenter⁵, H. J. Chantler^3,‡, P. T. W. Choy³, C. N. Davids⁵, M. Devlin⁶, D. B. Fossan^7,§, S. J. Freeman⁸, R. V. F. Janssens⁵, N. S. Kelsall⁹, T. Koike^7,∥, D. R. LaFosse⁷, D. G. Sarantites⁴, D. Seweryniak⁵, K. Starosta¹⁰, R. Wadsworth⁹, and A. N. Wilson¹¹

¹School of Engineering, University of the West of Scotland, Paisley PA1 2BE, United Kingdom
²Scottish Universities Physics Alliance
³Oliver Lodge Laboratory, University of Liverpool, Liverpool L69 7ZE, United Kingdom
⁴Department of Chemistry, Washington University, St. Louis, Missouri 63130, USA
⁵Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
⁶LANSCE-NS, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
⁷Department of Physics and Astronomy, State University of New York at Stony Brook, Stony Brook, New York 11794, USA
⁸School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
⁹Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
¹⁰Department of Chemistry, Simon Fraser University, Burnaby, British Columbia V5A 156, Canada
¹¹Research School of Physics and Engineering, Australian National University, Canberra ACT 0200, Australia

^*john.f.smith@uws.ac.uk
^†Present address: Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA.
^‡Present address: Addenbrookes Hospital, Department of Medical Physics, Cambridge CB2 2QQ, United Kingdom.
^§Deceased.
^∥Present address: Graduate School of Science, Tohoku University, Sendai 980-8578, Japan.

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Vol. 86, Iss. 3 — September 2012

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Physical Review C

covering nuclear physics

$γ$ -ray spectroscopy of neutron-deficient $^{123}$ Ce

J. F. Smith, L. J. Angus, E. S. Paul, C. J. Chiara, M. P. Carpenter, H. J. Chantler, P. T. W. Choy, C. N. Davids, M. Devlin, D. B. Fossan, S. J. Freeman, R. V. F. Janssens, N. S. Kelsall, T. Koike, D. R. LaFosse, D. G. Sarantites, D. Seweryniak, K. Starosta, R. Wadsworth, and A. N. Wilson

Phys. Rev. C 86, 034303 – Published 4 September 2012

Abstract

Authors & Affiliations

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Physical Review C

covering nuclear physics

γ-ray spectroscopy of neutron-deficient 123Ce

J. F. Smith, L. J. Angus, E. S. Paul, C. J. Chiara, M. P. Carpenter, H. J. Chantler, P. T. W. Choy, C. N. Davids, M. Devlin, D. B. Fossan, S. J. Freeman, R. V. F. Janssens, N. S. Kelsall, T. Koike, D. R. LaFosse, D. G. Sarantites, D. Seweryniak, K. Starosta, R. Wadsworth, and A. N. Wilson

Phys. Rev. C 86, 034303 – Published 4 September 2012

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$γ$ -ray spectroscopy of neutron-deficient $^{123}$ Ce