Mainz 2012 – wissenschaftliches Programm
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HK: Fachverband Physik der Hadronen und Kerne
HK 31: Nukleare Astrophysik
HK 31.8: Vortrag
Mittwoch, 21. März 2012, 18:45–19:00, RW 2
The 152Sm(p,n) reaction measurements in inverse kinematics — •Moritz Pohl — Goethe Universität Frankfurt am Main, Germany
Under stellar conditions, low-lying excited states in nuclei are in thermal equlibrium with the ground state. If those excited states undergo β-decays with a higher rate than the ground state, the β-decay half-life of this nucleus is dominated by the excited state. The corresponding life-times are extremly difficult to measure directly on earth, since the excitation occurs mostly via internal transition.
If the β-decay occurs via the Gamow-Teller transition, charge exchange reactions allow to investigate the decay strength. In order to verify the method of measuring the B(GT) strength of unstable heavy nuclei via inverse kinematics, the reaction p(152Sm,152Eu)n was used as a test case. This measurement allows to set constraints on the temperature dependent electron capture of 152Eu, which is an important s-process branching point. The s405 experiment took place at the R3B/LAND setup at GSI. A newly developed Low Energy Neutron detector Array (LENA) was used to measure the recoil neutrons, which are emitted at large angles relatively to the incoming beam. Preliminary results will be presented. This project was supported by the Helmholtz International Center for FAIR and the Helmholtz Young Investigator Group VH-NG-327.