Pour vous authentifier, privilégiez eduGAIN / To authenticate, prefer eduGAINeu

Séminaires

Isospin symmetry breaking in the 71Kr-71Br mirror system

par Prof. Alejandro Algora (IFIC (CSIC Univ. of Valencia))

Europe/Paris
100/0-MXX - Salle des Conseils (IJCLab)

100/0-MXX - Salle des Conseils

IJCLab

70
Montrer la salle sur la carte
Description
Studies of the beta decay of 71Kr have not been free of controversy. The first study by Oinonen et al. [1] showed a relatively too small ground state to ground state feeding for a mirror pair and prompted an immediate alternative explanation by Urkedal and Hamamoto [2] invoking possible shape effects and isospin breaking in the mirror system. Some years later, a careful in-beam study [3] restored the earlier interpretation of Oinonen, that since then has prevailed [4].

New insights have been recently obtained based on a high-statistics experiment performed at RIKEN Nishina Center. In this talk, I will present these new results from the perspective of deformation and isospin effects in the A= 70 region. Our results indicate that this is the very first identified case of isospin breaking in the ground state of a T=1/2 case [5]. We also find evidence of a long-sought 0+ state in 70Se populated in the beta delayed proton process.



[1] M. Oinonen et al., Physical Review C 56, 745 (1997).

[2] P. Urkedal and I. Hamamoto, Physical Review C 58, R1889 (1998)

[3] S. Fisher et al., Physical Review C 72, 024321 (2005).

[4] S. Waniganeththi et al., Physical Review C 106, 044317 (2022).

[5] A. Algora et al., Phys. Rev. Letts. 134, 162502 (2025)