New measurement of the He-3(alpha,gamma)Be-7 cross section at medium energies

M. Carmona-Gallardo, B. S. Nara Singh, M. J. G. Borge, J. A. Briz, M. Cubero, B. R. Fulton, H. Fynbo, N. Gordillo, M. Hass, G. Haquin, A. Maira, E. Nacher, Y. Nir-El, V. Kumar, J. McGrath, A. Munoz-Martin, A. Perea, V. Pesudo, G. Ribeiro, J. Sanchez del RioO. Tengblad, R. Yaniv, Z. Yungreis

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We report on a new cross-section measurement for the He-3(alpha, gamma)(7) Be reaction at three medium energies of E-c.m. between 1 and 3 MeV. The interest stems from the significant role played by the reaction in calculating an accurate solar neutrino flux and the primordial Li-7 abundance. The energy dependence of the astrophysical S-34 factor observed in the present work, especially above 1 MeV, highlights the need to constrain theories in order to obtain a precise extrapolated value for S-34(0). In this context, a comparison with the recent theoretical work in a fully microscopic fermionic molecular dynamics approach and a few other representative calculations emphasize the need for further experimental as well as theoretical work to resolve the existing conflicts.

Original languageEnglish
Article number032801
Pages (from-to)1-5
Number of pages5
JournalPhysical Review C
Issue number3
Publication statusPublished - 11 Sept 2012

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