# Mirrored one-nucleon knockout reactions to the Tz=$\pm\frac{3}{2}$ A=53 mirror nuclei

Abstract : Background: The study of excited states in mirror nuclei allows us to extract information on charge-dependent (i.e., isospin-nonconserving) interactions in nuclei. Purpose: To extend previous studies of mirror nuclei in the f72 region, investigating charge symmetry breaking of the strong nuclear force. Methods: γ-ray spectroscopy has been performed for the mirror (Tz=±32) pair Ni53 and Mn53, produced via mirrored one-nucleon knockout reactions. Results: Several new transitions have been identified in Ni53 from which a new level scheme has been constructed. Cross sections for knockout have been analyzed and compared with reaction model calculations where evidence is found for knockout from high-spin isomeric states. Mirror energy differences between isobaric analog states have been computed, compared to large scale shell-model calculations, and interpreted in terms of isospin-nonconserving effects. In addition, lifetimes for the long-lived Jπ=52−1 analog states in both Mn53 and Ni53 have been extracted through lineshape analysis, giving half-lives of t12=120(14) ps and t12=198(12) ps, respectively. Conclusions: The inclusion of a set of isovector isospin-nonconserving matrix elements to the shell-model calculations gave the best agreement with the experimental data.
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Submitted on : Thursday, February 25, 2016 - 9:07:57 AM
Last modification on : Thursday, February 1, 2018 - 1:26:10 AM

### Citation

S.A. Milne, M.A. Bentley, E.C. Simpson, P. Dodsworth, T. Baugher, et al.. Mirrored one-nucleon knockout reactions to the Tz=$\pm\frac{3}{2}$ A=53 mirror nuclei. Physical Review C, American Physical Society, 2016, 93 (02), pp.024318. ⟨10.1103/PhysRevC.93.024318⟩. ⟨in2p3-01278871⟩

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