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

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  • T. Baugher
  • D. Bazin
  • J. S. Berryman
  • A. M. Bruce
  • A. Gade
  • T. W. Henry
  • H. Iwasaki
  • A. Lemasson
  • S. M. Lenzi
  • S. McDaniel
  • D. R. Napoli
  • A. J. Nichols
  • A. Ratkiewicz
  • S. R. Stroberg
  • J. A. Tostevin
  • D. Weisshaar
  • K. Wimmer
  • R. Winkler


Publication details

JournalPhysical Review Letters
DateAccepted/In press - 26 Jul 2016
DatePublished (current) - 15 Aug 2016
Issue number8
Number of pages5
Original languageEnglish


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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© 2016 American Physical Society. This is an author-produced version of the published paper. Uploaded in accordance with the publisher’s self-archiving policy. Further copying may not be permitted; contact the publisher for details


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