Low energy measurement of the 7Be(p,gamma)8B cross section

F. Hammache, G. Bogaert, P. Aguer, C. Angulo, S. Barhoumi, L. Brillard, J. F. Chemin, G. Claverie, A. Coc, M. Hussonnois, M. Jacotin, J. Kiener, A. Lefebvre, C. Le Naour, S. Ouichaoui, J. N. Scheurer, V. Tatischeff, J. P. Thibaud, E. Virassamyna"iken

Submitted on 31 January 2001


We have measured the cross section of the 7Be(p,gamma)8B reaction for E_cm = 185.8 keV, 134.7 keV and 111.7 keV using a radioactive 7Be target (132 mCi). Single and coincidence spectra of beta^+ and alpha particles from 8B and 8Be^* decay, respectively, were measured using a large acceptance spectrometer. The zero energy S factor inferred from these data is 18.5 +/- 2.4 eV b and a weighted mean value of 18.8 +/- 1.7 eV b (theoretical uncertainty included) is deduced when combining this value with our previous results at higher energies.


Comment: Accepted for publication in Phys. Rev. Lett

Subjects: Nuclear Experiment; Astrophysics