Determination of S17 from 8B breakup by means of the method of continuum-discretized coupled-channels
- Department of Physics, Kyushu University, Fukuoka 812-8581 (Japan)
- Department of Physics, Chiba-Keizai College, Todoroki-cho 4-3-30, Inage, Chiba 263-0021 (Japan)
The astrophysical factor for 7Be(p, {gamma})8B at zero energy, S17(0), is determined from an analysis of 208Pb(8B, p+7Be)208Pb at 52 MeV/nucleon by means of the method of continuum-discretized coupled-channels (CDCC) taking account of all nuclear and Coulomb breakup processes. The asymptotic normalization coefficient (ANC) method is used to extract S17(0) from the calculated breakup cross section. The main result of the present paper is S{sub 17}(0) = 20.9{sub -1.9}{sup +2.0} eV b. This value of S17(0) differs from the one extracted with the first-order perturbation theory including Coulomb breakup by dipole transitions: 18.9 {+-} 1.8 eV b. It turns out that the difference is due to the inclusion of the nuclear and Coulomb-quadrupole transitions and multi-step processes of all-order in the present work. Our main result of S17(0) is consistent with the value obtained from a precise measurement of the p-capture reaction cross section extrapolated to zero incident energy, S17(0) = 22.1 {+-} 0.85 eV b. Thus, the agreement between the values of S17(0) obtained from direct 7Be(p, {gamma})8B and indirect 8B-breakup measurements is significantly improved.
- OSTI ID:
- 20877435
- Journal Information:
- AIP Conference Proceedings, Vol. 847, Issue 1; Conference: International symposium on origin of matter and evolution of galaxies 2005: New horizon of nuclear astrophysics and cosmology, Tokyo (Japan), 8-11 Nov 2005; Other Information: DOI: 10.1063/1.2234412; (c) 2006 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
- Country of Publication:
- United States
- Language:
- English
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