Structure of Fe60,62 and the onset of νg9/2 occupancy

N. Hoteling, C. J. Chiara, R. Broda, W. B. Walters, R. V. F. Janssens, M. Hjorth-Jensen, M. P. Carpenter, B. Fornal, A. A. Hecht, W. Królas, T. Lauritsen, T. Pawłat, D. Seweryniak, X. Wang, A. Wöhr, J. Wrzesiński, and S. Zhu
Phys. Rev. C 82, 044305 – Published 7 October 2010

Abstract

Level structures in Fe60,6234,36 and adjacent nuclei were studied with Gammasphere using the reaction of a 430-MeV Ni64 beam on a 55-mg/cm2 thick U238 target. High-spin level schemes were deduced from singly- and doubly-gated prompt coincidence events. Levels populated in the β decay of Mn60,62 isomers were studied in singly- and doubly-gated delayed coincidences. Spin and parity assignments were deduced from angular correlations of γ rays observed in both nuclei, leading to firm positive-parity yrast assignments up through 8+ in Fe62. The observed levels for Fe60 up to ~3.5 MeV compare well with pf shell-model calculations available in the literature. Calculations performed in a limited pfg basis exhibit reasonable agreement for the 2+, 4+, and 6+ levels in Fe62. However, theoretical descriptions that include the newly identified negative-parity levels in Fe62 require a much larger basis, necessarily including g9/2 neutrons, as well as improved interactions leading to negative-parity levels.

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  • Received 28 May 2010

DOI:https://doi.org/10.1103/PhysRevC.82.044305

©2010 American Physical Society

Authors & Affiliations

N. Hoteling1,2,*, C. J. Chiara1,2,†, R. Broda3, W. B. Walters1, R. V. F. Janssens2, M. Hjorth-Jensen4, M. P. Carpenter2, B. Fornal3, A. A. Hecht1,2,‡, W. Królas3,5, T. Lauritsen2, T. Pawłat3, D. Seweryniak2, X. Wang2,6,§, A. Wöhr1,2,6, J. Wrzesiński3, and S. Zhu2

  • 1Department of Chemistry and Biochemistry, University of Maryland, College Park, Maryland 20742, USA
  • 2Physics Division, Argonne National Laboratory, Argonne, Illinois 60439, USA
  • 3Niewodniczański Institute of Nuclear Physics PAN, Radzikowskiego 152, PL-31-342 Kraków, Poland
  • 4Department of Physics and Center of Mathematics for Applications, University of Oslo, N-0316 Oslo, Norway
  • 5Joint Institute for Heavy Ion Research, Oak Ridge, Tennessee 37831, USA
  • 6Department of Physics, University of Notre Dame, Notre Dame, Indiana 46556, USA

  • *Present address: Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
  • Corresponding author.
  • Present address: Department of Chemical and Nuclear Engineering, University of New Mexico, Albuquerque, New Mexico 87131-0001, USA.
  • §Present address: Department of Physics, Florida State University, Tallahassee, Florida 32306-4350, USA.

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Vol. 82, Iss. 4 — October 2010

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