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One-proton and one-neutron knockout reactions from N=Z=28 Ni 56 to the A=55 mirror pair Co 55 and Ni 55

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  • M. Spieker
  • A. Gade
  • D. Weisshaar
  • B. A. Brown
  • J. A. Tostevin
  • B. Longfellow
  • P. Adrich
  • D. Bazin
  • M. A. Bentley
  • J. R. Brown
  • C. M. Campbell
  • C. Aa Diget
  • B. Elman
  • T. Glasmacher
  • M. Hill
  • B. Pritychenko
  • A. Ratkiewicz
  • D. Rhodes


Publication details

JournalPhysical Review C
DatePublished - 22 May 2019
Issue number5
Number of pages7
Original languageEnglish


We present a high-resolution in-beam γ-ray spectroscopy study of excited states in the mirror nuclei Co55 and Ni55 following one-nucleon knockout from a projectile beam of Ni56. The newly determined partial cross sections and the γ-decay properties of excited states provide a test of state-of-the-art nuclear structure models and probe mirror symmetry in unique ways. The new experimental data are compared to large-scale shell-model calculations in the full pf space which include charge-dependent contributions. A mirror asymmetry for the partial cross sections leading to the two lowest 3/2- states in the A=55 mirror pair was identified as well as a significant difference in the E1 decays from the 1/21+ state to the same two 3/2- states. The mirror asymmetry in the partial cross sections cannot be reconciled with the present shell-model picture or small mixing introduced in a two-state model. The observed mirror asymmetry in the E1 decay pattern, however, points at stronger mixing between the two lowest 3/2- states in Co55 than in its mirror Ni55.

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