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HK: Hadronen und Kerne

HK 53: Nuclear Astrophysics IV

HK 53.6: Talk

Wednesday, March 18, 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. Wagner³ — ¹GSI 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).