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HK: Fachverband Hadronen und Kerne
HK 39: Astroparticle Physics
HK 39.2: Vortrag
Dienstag, 17. März 2009, 17:00–17:15, H-ZO 70
High resolution (3He,t) reaction on 100Mo and implications to double β decay — •Pia Heinrichs, Dieter Frekers, Eike W. Grewe, Peter Puppe, Tim Ruhe, and Jan H. Thies — Institut für Kernphysik, Westfälische Wilhelms-Universität Münster, 48149 Münster
A high-resolution 100Mo(3He,t)100Tc measurement was performed at RCNP in Osaka (Japan) using the 3He beam at an incident energy of 420 MeV and the high resolution WS course beam-line. An energy resolution of 29 keV was achieved.
The measured data were used to extract the GT− strength in 100Tc.
We observe that almost the entire low-energy (< 6 MeV) GT− strength is concentrated in the ground state.
This has implications on the matrix element of the 2νββ decay of 100Mo which will be discussed. In addition, the fact that the B(GT−) strength is concentrated in the ground state allows one to consider 100Mo as a detector for supernova and solar neutrinos, where such a detector (like NEMO-3 or MOON) may even be sensitive to the neutrino spectrum, resp. neutrino temperature.
At high energies we find a double peaked Gamow-Teller Giant Resonance (GTGR) structure, which exhausts ∼ 50% of the Ikeda sum rule.