In-beam γ-ray spectroscopy of Mn63

T. Baugher, A. Gade, R. V. F. Janssens, S. M. Lenzi, D. Bazin, M. P. Carpenter, C. J. Chiara, A. N. Deacon, S. J. Freeman, G. F. Grinyer, C. R. Hoffman, B. P. Kay, F. G. Kondev, T. Lauritsen, E. M. Lunderberg, S. McDaniel, K. C. Meierbachtol, A. Ratkiewicz, S. R. Stroberg, K. A. Walsh, D. Weisshaar, and S. Zhu
Phys. Rev. C 93, 014313 – Published 21 January 2016

Abstract

Background: Neutron-rich, even-mass chromium and iron isotopes approaching neutron number N=40 have been important benchmarks in the development of shell-model effective interactions incorporating the effects of shell evolution in the exotic regime. Odd-mass manganese nuclei have received less attention, but provide important and complementary sensitivity to these interactions.

Purpose: We report the observation of two new γ-ray transitions in Mn63, which establish the (9/2) and (11/2) levels on top of the previously known (7/2) first-excited state. The lifetime for the (7/2) and (9/2) excited states were determined for the first time, while an upper limit could be established for the (11/2) level.

Method: Excited states in Mn63 have been populated in inelastic scattering from a Be9 target and in the fragmentation of Fe65. γγ coincidence relationships were used to establish the decay level scheme. A Doppler line-shape analysis for the Doppler-broadened (7/2)5/2, (9/2)(7/2), and (11/2)(9/2) transitions was used to determine (limits for) the corresponding excited-state lifetimes.

Results: The low-lying level scheme and the excited-state lifetimes were compared with large-scale shell-model calculations using different model spaces and effective interactions in order to isolate important aspects of shell evolution in this region of structural change.

Conclusions: While the theoretical (7/2) and (9/2) excitation energies show little dependence on the model space, the calculated lifetime of the (7/2) level and calculated energy of the (11/2) level reveal the importance of including the neutron g9/2 and d5/2 orbitals in the model space. The LNPS effective shell-model interaction provides the best overall agreement with the new data.

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  • Received 24 March 2014
  • Revised 1 December 2015

DOI:https://doi.org/10.1103/PhysRevC.93.014313

©2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

T. Baugher1,2,3, A. Gade1,2, R. V. F. Janssens4, S. M. Lenzi5, D. Bazin1, M. P. Carpenter4, C. J. Chiara4,6, A. N. Deacon7, S. J. Freeman7, G. F. Grinyer8, C. R. Hoffman4, B. P. Kay4, F. G. Kondev9, T. Lauritsen4, E. M. Lunderberg1,2, S. McDaniel1,2, K. C. Meierbachtol1,10, A. Ratkiewicz1,2, S. R. Stroberg1,2, K. A. Walsh1,2, D. Weisshaar1, and S. Zhu4

  • 1National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 2Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 3Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA
  • 4Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 5Dipartimento di Fisica e Astronomia dell'Università and INFN, Sezione di Padova, I-35131 Padova, Italy
  • 6Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
  • 7School of Physics and Astronomy, University of Manchester, Manchester M13 9PL, United Kingdom
  • 8Grand Accélérateur National d'Ions Lourds (GANIL), CEA/DSM-CNRS/IN2P3, Bvd Henri Becquerel, 14076 Caen, France
  • 9Nuclear Engineering Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 10Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA

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Vol. 93, Iss. 1 — January 2016

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