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Bochum 1998 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 53: Nuclear Astrophysics IV

HK 53.6: Vortrag

Mittwoch, 18. März 1998, 15:30–15:45, G

Coulomb Dissociation of 8B at 254 A MeV — •N. Iwasa1, F. Boue1, G. Surowka1, T. Baumann1, B. Blank2, S. Czajkowski2, A. Förster3, M. Gai4, H. Geissel1, E. Grosse1, M. Hellström1, P. Koczon1, B. Kohlmeyer5, R. Kulessa6, F. Laue1, J. Speer3, T. Motobayashi7, H. Oeschler3, A. Ozawa1, M.S. Pravikoff2, E. Schwab1, W. Schwab1, P. Senger1, K. Sümmerer1, C. Sturm3, W. Walus6, A. Surowiec1, T. Teranishi8, F. Uhlig3, and A. Wagner31GSI Darmstadt — 2CEN Bordeaux — 3TU Darmstadt — 4Univ. Connecticut — 5Univ. Marburg — 6Univ. Krakow — 7Rikkyo Univ. — 8RIKEN Tokyo

Coulomb Dissociation (CD) of 8B into 7Be+p is an alternative approach to determine the S-factor for the 7Be(p,γ)-reaction. In experiments at RIKEN, the CD of 8B has been studied at about 50 A MeV [1,2]. At GSI we have measured the same reaction at 254 A MeV using a secondary 8B beam from the FRS.The KaoS spectrometer was used to observe both breakup products in coincidence. The CD cross section has been evaluated in the c.m.-energy range from ≈ 0.2 - 3 MeV. We obtain good agreement with both the RIKEN CD results and those of a recent direct-reaction study [3] which both favour an astrophysical S(E1)-factor about 20% lower than the presently adopted value.

[1] N. Iwasa et al., J. Phys. Soc. Japan 65, 1256 (1996).

[2] T. Kikuchi et al., Phys. Lett. B 391, 261 (1997).

[3] G. Bogaert et al., Proc. Solar Neutrino Conf. IV, Heidelberg (1997).

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