Abstract
We have studied the decay of the shell nuclei , and produced in fragmentation reactions. The proton separation energies in the daughter nuclei are relatively large –5 MeV) so studies of the rays are essential. The experiments were performed at GSI as part of the Stopped-beam campaign with the RISING setup consisting of 15 Euroball Cluster Ge detectors. From the newly obtained high precision -decay half-lives, excitation energies, and branching ratios, we were able to extract Fermi and Gamow-Teller transition strengths in these decays. With these improved results it was possible to compare in detail the Gamow-Teller (GT) transition strengths observed in beta decay including a sensitivity limit with the strengths of the to transitions derived from high resolution reactions on the mirror target nuclei at RCNP, Osaka. The accumulated (GT) strength obtained from both experiments looks very similar although the charge exchange reaction provides information on a broader energy range. Using the “merged analysis” one can obtain a full picture of the (GT) over the full range. Looking at the individual transitions some differences are observed, especially for the weak transitions. Their possible origins are discussed.
12 More- Received 24 June 2014
- Revised 18 October 2014
DOI:https://doi.org/10.1103/PhysRevC.91.014301
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