The 3He(4He,γ)7Be reaction is the key process for the production of 7Be and 8B neutrinos in the Sun. We have designed a new experimental setup to study this reaction with high accuracy at low energies using two different experimental techniques. The first method consists in measuring the prompt capture gamma-ray transitions with an ultra-low background germanium detector heavily shielded and placed at close distance from a 3He windowless gas target. With another fully shielded large-volume germanium detector we will also measure the β-decay of the 7Be residual nuclei. The aim of the experiment is to reduce the error on the astrophysical factor S3, 4 to 4%.
Towards a high-precision measurement of the 3He(alpha,gamma)7Be cross section at LUNA / H. Costantini, D. Bemmerer, P. Bezzon, R. Bonetti, C. Broggini, M. L. Casanova, F. Confortola, P. Corvisiero, J. Cruz, Z. Elekes, A. Formicola, Zs. Fulop, G. Gervino, C. Gustavino, A. Guglielmetti, Gy. Gyurky, G. Imbriani, A. P. Jesus, M. Junker, A. Lemut, M. Marta, R. Menegazzo, P. Prati, V. Roca, D. Rogalla, C. Rolfs, M. Romano, C. Rossi Alvarez, F. Schumann, E. Somorjai, O. Straniero, F. Strieder, F. Terrasi, H. P. Trautvetter. - In: THE EUROPEAN PHYSICAL JOURNAL. A, HADRONS AND NUCLEI. - ISSN 1434-6001. - 27:Supplement 1(2006), pp. 177-180. [10.1140/epja/i2006-08-026-5]
Towards a high-precision measurement of the 3He(alpha,gamma)7Be cross section at LUNA
R. Bonetti;A. Guglielmetti;
2006
Abstract
The 3He(4He,γ)7Be reaction is the key process for the production of 7Be and 8B neutrinos in the Sun. We have designed a new experimental setup to study this reaction with high accuracy at low energies using two different experimental techniques. The first method consists in measuring the prompt capture gamma-ray transitions with an ultra-low background germanium detector heavily shielded and placed at close distance from a 3He windowless gas target. With another fully shielded large-volume germanium detector we will also measure the β-decay of the 7Be residual nuclei. The aim of the experiment is to reduce the error on the astrophysical factor S3, 4 to 4%.
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