A Measurement of the Coulomb Dissociation of 8B at 254 MeV/nucleon and the 8B Solar Neutrino Flux

Iwasa, N.; Boue, F.; Surowka, G.; Suemmerer, K.; Baumann, T.; Blank, B.; Czajkowski, S.; Forster, A.; Gai, M.; Geissel, H.; Grosse, E.; Hellstrom, M.; Koczon, P.; Kohlmeyer, B.; Kulessa, R.; Laue, F.; Marchand, C.; Motobayashi, T.; Oeschler, H.; Ozawa, A.; Pravikoff, M. S.; Schwab, E.; Schwab, W.; Senger, P.; Speer, J.; Sturm, C.; Surowiec, A.; Teranishi, T.; Uhlig, F.; Wagner, A.; Walus, W.; Bertulani, C. A.

A Measurement of the Coulomb Dissociation of 8B at 254 MeV/nucleon and the 8B Solar Neutrino Flux

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We have measured the Coulomb dissociation of 8B into 7Be and proton at 254 MeV/nucleon using a large-acceptance focusing spectrometer. The astrophysical S17 factor for the 7Be(p,gamma)8B reaction at E{c.m.} = 0.25-2.78 MeV is deduced yielding S17(0)=20.6 \pm 1.2 (exp.) \pm 1.0 (theo.) eV-b. This result agrees with the presently adopted zero-energy S17 factor obtained in direct-reaction measurements and with the results of other Coulomb-dissociation studies performed at 46.5 and 51.2 MeV/nucleon.
paper to be published in Phys. Rev. Lett. 3 figures. New Version fixes formatting problems with the figures only. There are no other changes