Göttingen 1997 – wissenschaftliches Programm

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HK: Hadronen und Kerne

HK 31: Nukleare Astrophysik II

HK 31.4: Vortrag

Dienstag, 25. März 1997, 18:15–18:30, HS D

Coulomb Dissociation of ⁸B at 257 A MeV — •N. Iwasa¹, F. Boue¹, T. Baumann¹, H. Geissel¹, E. Grosse¹, M. Hellström¹, P. Koczon¹, F. Laue¹, E. Schwab¹, W. Schwab¹, P. Senger¹, K. Sümmerer¹, A. Surowiec¹, G. Surowka¹, B. Kohlmeyer², A. Förster³, H. Oeschler³, C. Sturm³, J. Speer³, F. Uhlig³, A. Wagner³, B. Blank⁴, C. Marchand⁴, M.S. Pravikoff⁴, R. Kulessa⁵, W. Walus⁵, T. Motobayashi⁶, T. Teranishi⁶, and M. Gai⁷ — ¹GSI Darmstadt — ²Univ. Marburg — ³TH Darmstadt — ⁴CEN Bordeaux — ⁵Univ. Krakow — ⁶Rikkyo Univ. — ⁷Univ. Connecticut

Coulomb Dissociation (CD) of the unstable nucleus ⁸B is of particular interest with respect to the “solar neutrino problem”. This is related to the fact that CD of ⁸B provides an alternative approach to obtain the S-factor for the ⁷Be(p,γ)-reaction at low energies. In experiments at RIKEN the CD of ⁸B has been studied at about 50 A MeV [1]. At GSI we have undertaken a similar study at 257 A MeV using the fragment separator FRS to produce the ⁸B beam and the KaoS spectrometer to observe both breakup products (p and ⁷Be) in coincidence. Goals were to go down to lower relative energies than in the RIKEN experiment and also to measure the M1 component in addition to the dominant E1 multipolarity. Preliminary experimental results will be presented.

[1] T. Motobayashi et al. Phys. Rev. Lett. 73 2680 (1994)