Mirrored one-nucleon knockout reactions to the T-z = +/- 3/2 A=53 mirror nuclei
2016
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 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-model calculations, 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-model
calculations gave the best agreement with the experimental data.
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