Mirror Energy Differences at Large Isospin Studied through Direct Two-Nucleon Knockout

P. J. Davies, M. A. Bentley, T. W. Henry, E. C. Simpson, A. Gade, S. M. Lenzi, T. Baugher, D. Bazin, J. S. Berryman, A. M. Bruce, C. Aa. Diget, H. Iwasaki, A. Lemasson, S. McDaniel, D. R. Napoli, A. Ratkiewicz, L. Scruton, A. Shore, R. Stroberg, J. A. Tostevin, D. Weisshaar, K. Wimmer, and R. Winkler
Phys. Rev. Lett. 111, 072501 – Published 16 August 2013

Abstract

The first spectroscopy of excited states in Ni52 (Tz=2) and Co51 (Tz=3/2) has been obtained using the highly selective two-neutron knockout reaction. Mirror energy differences between isobaric analogue states in these nuclei and their mirror partners are interpreted in terms of isospin nonconserving effects. A comparison between large-scale shell-model calculations and data provides the most compelling evidence to date that both electromagnetic and an additional isospin nonconserving interactions for J=2 couplings, of unknown origin, are required to obtain good agreement.

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  • Received 12 February 2013

DOI:https://doi.org/10.1103/PhysRevLett.111.072501

© 2013 American Physical Society

Authors & Affiliations

P. J. Davies1,*, M. A. Bentley1, T. W. Henry1, E. C. Simpson2, A. Gade3, S. M. Lenzi4, T. Baugher3, D. Bazin3, J. S. Berryman3, A. M. Bruce5, C. Aa. Diget1, H. Iwasaki3, A. Lemasson3, S. McDaniel3, D. R. Napoli6, A. Ratkiewicz3, L. Scruton1, A. Shore3, R. Stroberg3, J. A. Tostevin2, D. Weisshaar3, K. Wimmer3, and R. Winkler3

  • 1Department of Physics, University of York, Heslington, York YO10 5DD, United Kingdom
  • 2Department of Physics, Faculty of Engineering and Physical Sciences, University of Surrey, Guildford GU2 7XH, United Kingdom
  • 3National Superconducting Cyclotron Laboratory, Michigan State University, East Lansing, Michigan 48824, USA
  • 4Dipartimento di Fisica del’Università and INFN, Sezione di Padova, I-35131 Padova, Italy
  • 5School of Computing, Engineering and Mathematics, University of Brighton, Brighton BN2 4GJ, United Kingdom
  • 6INFN, Laboratori Nazionali di Legnaro, I-35020 Legnaro, Italy

  • *paul.davies@york.ac.uk

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Vol. 111, Iss. 7 — 16 August 2013

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