Mirrored one-nucleon knockout reactions to the T-z = +/- 3/2 A=53 mirror nuclei
2016
Background: The study of excited states in
mirror nucleiallows us to extract information on charge-dependent (i.e.,
isospin-nonconserving) interactions in nuclei. Purpose: To extend previous studies of
mirror nucleiin the f7/2 region, investigating charge symmetry breaking of the strong
nuclear force. Methods: γ-ray spectroscopy has been performed for the mirror (Tz= ±3/2) pair 53Ni and 53Mn, produced via mirrored one-nucleon knockout reactions. Results: Several new transitions have been identified in 53Ni 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-modelcalculations, and interpreted in terms of
isospin-nonconserving effects. In addition, lifetimes for the long-lived J π = 5 /2 − 1 analog states in both 53Mn and 53Ni have been extracted through lineshape analysis, giving half-lives of t1/2 = 120 (14) ps and t1/2 = 198 (12) ps,respectively. Conclusions: The inclusion of a set of
isovector
isospin-nonconserving matrix elements to the
shell-modelcalculations gave the best agreement with the experimental data.
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