Low-energy cross section of the 7Be(p,g)8B solar fusion reaction from Coulomb dissociation of 8B
F. Schuemann, S. Typel, F. Hammache, F. Uhlig, K. Suemmerer, I. Boettcher, D. Cortina, A. Foerster, M. Gai, H. Geissel, U. Greife, E. Grosse, N. Iwasa, P. Koczon, B. Kohlmeyer, R. Kulessa, H. Kumagai, N. Kurz, M. Menzel, T. Motobayashi, H. Oeschler, A. Ozawa, M. Ploskon, W. Prokopowicz, E. Schwab, P. Senger, F. Strieder, C. Sturm, Zhi-Yu Sun, G. Surowka, A. Wagner, W. Walus
Abstract
Final results from an exclusive measurement of the Coulomb breakup of 8B into 7Be+p at 254 A MeV are reported. Energy-differential Coulomb-breakup cross sections are analyzed using a potential model of 8B and first-order perturbation theory. The deduced astrophysical S17 factors are in good agreement with the most recent direct 7Be(p,gamma)8B measurements and follow closely the energy dependence predicted by the cluster-model description of 8B by Descouvemont. We extract a zero-energy S17 factor of 20.6 +- 0.8 (stat) +- 1.2 (syst) eV b.
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