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


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

Iwasa, N.; Boue, F.; Surowka, G.; Sümmerer, K.; Baumann, T.; Blank, B.; Czajkowski, S.; Förster, A.; Gai, M.; Geissel, H.; Grosse, E.; Hellström, 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.

We have measured the Coulomb dissociation of 8B into 7Be and a proton at 254 MeV/nucleon using a large-acceptance focusing spectrometer.
The astrophysical S17-factor for the 7Be(p, gamma)8B reaction at Ec.m. = 0.25-2.78 MeV is deduced yielding S17(0) = 20.6±1.2 (expt)
±1.0(theor) 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.

Keywords: Coulomb Dissociation 8B Solar Neutrino Flux

  • Physical Review Letters 83, 2910-2913

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Publ.-Id: 2925