München 2006 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 21: Postersitzung

HK 21.47: Poster

Dienstag, 21. März 2006, 15:30–17:00, P

First data on ³He(α,γ)⁷Be from LUNA — •Daniel Bemmerer — Istituto Nazionale di Fisica Nucleare, Sezione di Padova, Italy

The ³He(α,γ)⁷Be cross section is currently the major nuclear physics uncertainty in the ⁸B neutrino flux obtained from solar models. Previous experimental studies of this reaction disagree on the normalization of the astrophysical S-factor. In an effort to reduce the uncertainty, a precision experiment at low energy has begun at the LUNA2 400 kV accelerator, deep underground in Italy’s Gran Sasso laboratory. Both the promptly emitted gamma rays and the produced ⁷Be activity are detected in order to exclude possible systematic effects. Preliminary results of the activation study will be presented together with an outlook on the attainable precision.