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 Jπ=5/2− 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.
Mirrored one-nucleon knockout reactions to the Tz=± 32 A=53 mirror nuclei
LENZI, SILVIA MONICA;
2016
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 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 Jπ=5/2− 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.File | Dimensione | Formato | |
---|---|---|---|
PRC93.024318.pdf
accesso aperto
Descrizione: pubblicazione
Tipologia:
Postprint (accepted version)
Licenza:
Accesso libero
Dimensione
608.06 kB
Formato
Adobe PDF
|
608.06 kB | Adobe PDF | Visualizza/Apri |
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.