Bochum 2009 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Downloads | Hilfe
HK: Fachverband Hadronen und Kerne
HK 26: Nuclear Structure and Dynamics I
HK 26.4: Vortrag
Dienstag, 17. März 2009, 15:15–15:30, H-ZO 40
High resolution (3He,t) reaction on 76Ge and implications to double β decay — •Jan H. Thies, Dieter Frekers, Eike-W. Grewe, Pia Heinrichs, Peter Puppe, and Tim Ruhe — Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 9, 48149 Münster
A high-resolution 76Ge(3He,t)76As 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 27 keV was achieved.
The measured data were used to extract the GT− strength in 76As, which is the intermediate nucleus in the double β decay of 76Ge. We observe that the GT− strength up to 5 MeV is highly fragmented. To construct the 2νββ decay matrix element for 76Ge, these data are then combined with GT+ data from a 76Se(d,2He)76As measurement performed at KVI in Groningen (Netherlands). We note a strong level-by-level anti-correlation, which we attribute to the difference of the intrinsic deformation of the two nuclei, 76Ge and 76Se. We will discuss the implications on the matrix element of the 76Ge 2νββ decay.