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Low-energy cross section of the 7Be(p,g)8B solar fusion reaction from Coulomb dissociation of 8B

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arxiv nucl-ex/0508014 v2 pith:TA2JK4IN submitted 2005-08-11 nucl-ex

F. Schuemann , S. Typel , F. Hammache , F. Uhlig , K. Suemmerer , I. Boettcher , D. Cortina , A. Foerster
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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
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keywords coulombcrossagreementanalyzedastrophysicalbreakupcloselycluster-model
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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 S_17 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 S_17 factor of 20.6 +- 0.8 (stat) +- 1.2 (syst) eV b.

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