Isospin Symmetry at High Spin Studied via Nucleon Knockout from Isomeric States

S. A. Milne, M. A. Bentley, E. C. Simpson, T. Baugher, D. Bazin, J. S. Berryman, A. M. Bruce, P. J. Davies, C. Aa. Diget, A. Gade, T. W. Henry, H. Iwasaki, A. Lemasson, S. M. Lenzi, S. McDaniel, D. R. Napoli, A. J. Nichols, A. Ratkiewicz, L. Scruton, S. R. Stroberg, J. A. Tostevin, D. Weisshaar, K. Wimmer, and R. Winkler
Phys. Rev. Lett. 117, 082502 – Published 15 August 2016

Abstract

One-neutron knockout reactions have been performed on a beam of radioactive Co53 in a high-spin isomeric state. The analysis is shown to yield a highly selective population of high-spin states in an exotic nucleus with a significant cross section, and hence represents a technique that is applicable to the planned new generation of fragmentation-based radioactive beam facilities. Additionally, the relative cross sections among the excited states can be predicted to a high level of accuracy when reliable shell-model input is available. The work has resulted in a new level scheme, up to the 11+ band-termination state, of the proton-rich nucleus Co52 (Z=27, N=25). This has in turn enabled a study of mirror energy differences in the A=52 odd-odd mirror nuclei, interpreted in terms of isospin-nonconserving (INC) forces in nuclei. The analysis demonstrates the importance of using a full set of J-dependent INC terms to explain the experimental observations.

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  • Received 22 May 2016

DOI:https://doi.org/10.1103/PhysRevLett.117.082502

© 2016 American Physical Society

Physics Subject Headings (PhySH)

Nuclear Physics

Authors & Affiliations

S. A. Milne1, M. A. Bentley1, E. C. Simpson2, T. Baugher3,4, D. Bazin4, J. S. Berryman4, A. M. Bruce5, P. J. Davies1, C. Aa. Diget1, A. Gade3,4, T. W. Henry1, H. Iwasaki3,4, A. Lemasson4,6, S. M. Lenzi7, S. McDaniel3,4, D. R. Napoli8, A. J. Nichols1, A. Ratkiewicz3,4, L. Scruton1, S. R. Stroberg3,4,9, J. A. Tostevin10, D. Weisshaar4, K. Wimmer4,11, and R. Winkler4

  • 1Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
  • 2Department of Nuclear Physics, Research School of Physics and Engineering, Australian National University, Canberra, Australian Capital Territory 2601, Australia
  • 3Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824, USA
  • 4National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 5School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
  • 6GANIL, CEA/DSM-CNRS/IN2P3, BP55027, F-14076, Caen Cedex 5, France
  • 7Dipartimento di Fisica del’Universita and INFN, Sezione di Padova, I-35131 Padova, Italy
  • 8INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy
  • 9TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, V6T 2A3 Canada
  • 10Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom
  • 11Department of Physics, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033 Japan

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Issue

Vol. 117, Iss. 8 — 19 August 2016

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