Darmstadt 2008 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Kern- und Teilchen-Astrophysik

HK 36.6: Talk

Thursday, March 13, 2008, 18:15–18:30, 2B

The Study of ³He(α,γ)⁷Be with a Recoil Separator — •Antonino DiLeva^1,2, Ralf Kunz¹, Claus Rolfs¹, Frank Strieder¹, and Lucio Gialanella² — ¹Institut für Physik mit Ionenstrahlen, Ruhr-Universität Bochum, Germany — ²INFN Napoli, Italy

The ³He(α,γ)⁷Be reaction plays an important role in the interpretation of the solar neutrino experiments, since the estimate of the total neutrino flux relies on the solar neutrino spectrum, calculated by solar models. The high energy component in this spectrum is mainly produced by the decay of ⁷Be and ⁸B. Moreover, the uncertainty in the ³He(α,γ)⁷Be cross section is one of the largest uncertainty in the predicted primordial ⁷Li abundance in Big Bang Nucleosynthesis calculations.

Previous measurements of the ³He(α,γ)⁷Be cross section have been performed detecting the capture γ-rays or, alternatively, measuring the activity of the synthesized ⁷Be. An alternative approach uses the ERNA recoil separator at the 4MV tandem accelerator at the Ruhr-Universität Bochum to detect directly the ⁷Be reaction products and, additionally, the coincident detection of the capture γ-rays. The results of this experiment are presented and compared with literature values.

Supported by DFG(Ro 429/35-3) and INFN