München 2006 – wissenschaftliches Programm
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HK: Physik der Hadronen und Kerne
HK 48: Elektromagnetische und Hadronische Sonden
HK 48.3: Gruppenbericht
Donnerstag, 23. März 2006, 18:00–18:30, F
Experimental determination of double-beta decay matrix elements thru charge-exchange reactions — •E.-W. Grewe, C. Bäumer, H. Dohmann, D. Frekers, S. Hollstein, S. Rakers, and J.-H. Thies — Institut für Kernphysik, Münster
The two neutrino double-beta decay represents a test case for our knowledge of nuclear wave functions. It is believed to proceed in at least two different modes: the neutrinoless (0ν β β) and the two-neutrino (2ν β β) mode. The decay mechanism is believed to be a combination of two virtual decays. Half-lives can be deduced from the involved nuclear matrix elements. The nuclear matrix element of the 2ν-mode can be experimentally determined using charge-exchange reactions at intermediate energies and extracting Gamow-Teller (GT) transition strengths[1]. Using the (d,2He) reaction at the KVI (Groningen, NL) we recently measured the GT+ distributions relevant for the double-beta decay of 64Zn, 76Ge and 96Zr[2]. The resulting excitation energy spectra are presented and an overview about the state of the experiments is given.
[1] S. Rakers et al., Phys. Rev. C 71, 054313 (2005)
[2] E.-W. Grewe and D. Frekers, submitted to Prog. Part. Nucl. Phys.(2005)