Astrophysical S-factor for the He-3(alpha,gamma)Be-7 reaction via the asymptotic normalization coefficient (ANC) method

0533993 - ÚJF 2021 RIV NL eng J - Journal Article
Kiss, G. G. - La Cognata, M. - Spitaleri, C. - Yarmukhamedov, R. - Wiedenhover, I. - Baby, L. T. - Cherubini, S. - Cvetinovic, A. - D'Agata, Giuseppe - Figuera, P. - Guardo, G. L. - Gulino, M. - Hayakawa, S. - Indelicato, I. - Lamia, L. - Lattuada, M. - Mudo, F. - Palmerini, S. - Pizzone, R. G. - Rapisarda, G. G. - Romano, S. - Sergi, M. L. - Sparta, R. - Trippella, O. - Tumino, A. - Anastasiou, M. - Kuvin, S. A. - Rijal, N. - Schmidt, B. - Igamov, S. B. - Sakuta, S. B. - Tursunmakhatov, K. I. - Fulop, Z. - Gyurky, G. - Szucs, T. - Halasz, Z. - Somorjai, E. - Hons, Zdeněk - Mrázek, Jaromír - Tribble, R. E. - Mukhamedzhanov, A. M.
Astrophysical S-factor for the He-3(alpha,gamma)Be-7 reaction via the asymptotic normalization coefficient (ANC) method.
Physics Letters. B. Roč. 807, AUG (2020), č. článku 135606. ISSN 0370-2693. E-ISSN 1873-2445
R&D Projects: GA MŠMT(CZ) EF16_013/0001679
Institutional support: RVO:61389005
Keywords : nuclear physics * nucleosynthesis
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 4.771, year: 2020
Method of publishing: Open access
https://doi.org/10.1016/j.physletb.2020.135606

The detection of the neutrinos produced in the p - p chain and in the CNO cycle can be used to test the Standard Solar Model. The He-3(alpha,gamma)Be-7 reaction is the first reaction of the 2nd and 3rd branch of the p - p chain, therefore, the uncertainty of its cross section sensitively influences the prediction of the Be-7 and B-8 neutrino fluxes. Despite its importance and the large number of experimental and theoretical works devoted to this reaction, the knowledge on the reaction cross section at energies characterizing the core of the Sun (15 keV - 30 keV) is limited and further experimental efforts are needed to reach the desired (approximate to 3%) accuracy. The precise knowledge on the external capture contribution to the He-3(alpha,gamma)Be-7 reaction cross section is crucial for the theoretical description of the reaction mechanism. In the present work the indirect measurement of this external capture contribution using the Asymptotic Normalization Coefficient (ANC) technique is reported. To extract the ANC, the angular distributions of deuterons emitted in the Li-6(He-3,d)Be-7 alpha-transfer reaction were measured with high precision at E-3He = 3.0 MeV and E-3He = 5.0 MeV. The ANCs were then extracted from comparison of DWBA calculations to the measured data and the zero energy astrophysical S-factor for He-3(alpha,gamma)Be-7 reaction was found to be 0.534 +/- 0.025 keVb.
Permanent Link: http://hdl.handle.net/11104/0312215