| Autor: |
Milne, SA, Bentley, MA, Simpson, EC, Dodsworth, P, Baugher, T, Bazin, D, Berryman, JS, Bruce, AM, Davies, PJ, Aa. Diget, C, Gade, A, Henry, TW, Iwasaki, H, Lemasson, A, Lenzi, SM, McDaniel, S, Napoli, DR, Nichols, AJ, Ratkiewicz, A, Scruton, L, Stroberg, SR, Tostevin, JA, Weisshaar, D, Wimmer, K, Winkler, R |
| Jazyk: |
angličtina |
| Rok vydání: |
2016 |
| Popis: |
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. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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