München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 21: Postersitzung
HK 21.7: Poster
Dienstag, 21. März 2006, 15:30–17:00, P
Overview of the experimental determination of nuclear matrix elements for double-beta decay through charge-exchange reactions — •H. Dohmann, C. Bäumer, D. Frekers, E.-W. Grewe, S. Hollstein, S. Rakers und J.-H. Thies — Institut für Kernphysik, Münster
The double-beta decay is a second order weak transition. It is believed to proceed in at least two modes: the 0ν-mode and the 2ν-mode. The 2ν-mode represents a test case for our knowledge about the nuclear structure of the involved isobars. The nuclear matrix elements relevant for β β-decay can be determined, if the complete set of Gamow-Teller (GT) matrix elements for the two virtual transitions (GT+ and GT−) are known[1]. GT-strength distributions can be measured by charge-exchange reactions. We have measured the GT+ distributions in various nuclei using the (d,2He)-reaction. By combining (d,2He) data with (3He,t) or (p,n) data, we can compute the double GT matrix element and therefore the 2ν β β half-life solely from measured nuclear structure data. An Overview of recent experiments is presented.
[1] S. Rakers et al., Phys. Rev. C 70, 054302 (2004)