2023/10/11 by K. Wimmer, P. Ruotsalainen, Wimmer, K. +91 · 1 citation
Physics and Astronomy · Engineering · #Nuclear physics research studies #Atomic and Molecular Physics #Particle accelerators and beam dynamics
paper · pdf · doi:10.48550/arxiv.2310.07357
Excited states in the Tz = 0, -1 nuclei 62Ga and 62Ge were populated in direct reactions of relativistic radioactive ion beams at the RIBF. Coincident \grays were measured with the DALI2+ array and uniquely assigned to the A=62 isobars. In addition, 62Ge was also studied independently at JYFL-ACCLAB using the 24Mg(40Ca,2n)62Ge fusion-evaporation reaction. The first excited T=1, Jπ=2+ states in 62Ga and 62Ge were identified at 979(1) and 965(1)~keV, respectively, resolving discrepant interpretations in the literature. States beyond the first 2+ state in 62Ge were also identified for the first time in the present work. The results are compared with shell-model calculations in the fp model space. Mirror and triplet energy differences are analyzed in terms of individual charge-symmetry and charge-independence breaking contributions. The MED results confirm the shrinkage of the p-orbits' radii when they are occupied by at least one nucleon on average.