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Erlangen 2001 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 19: Kern- und Teilchen- Astrophysik II

HK 19.3: Vortrag

Dienstag, 20. März 2001, 15:00–15:15, F

Coulomb Dissociation of 8B at 254 A MeV — •F. Schümann1, K. Behr2, I. Böttcher3, A. Bruenle2, K. Burkard2, D. Cortina2, A. Förster4, M. Gai5, H. Geissel2, U. Greife6, F. Hammache2, N. Iwasa7, P. Koczon2, B. Kohlmeyer3, R. Kulessa8, H. Kumagai7, M. Menzel3, T. Motobayashi9, H. Oeschler4, A. Ozawa7, M. Ploskon8, E. Schwab2, P. Senger2, K. Sümmerer2, Z. Sun2, G. Surowka8, F. Uhlig4, A. Wagner10, and W. Walus81Univ. Bochum — 2GSI Darmstadt — 3Univ. Marburg — 4TU Darmstadt — 5Univ. Connecticut — 6Colorado School of Mines — 7RIKEN Tokyo — 8Univ. Krakow — 9Rikkyo Univ. — 10FZ Rossendorf

Coulomb Dissociation (CD) of 8B is an alternative approach to determine the astrophysical S factor of the reaction 7Be(p,γ). In previous experiments at RIKEN and GSI, the CD of 8B has been studied with different projectile energies [1,2]. In a new experiment at GSI we have measured this reaction at 254 A MeV using a secondary 8B beam from the FRS. The KaoS spectrometer was used to observe the breakup products in coincidence. The use of two PPACs positioned upstream from the target in combination with two pairs of silicon strip detectors directly after the target allows for angular distribution measurements of the excited 8B. This information is necessary to determine the strength of the E2-contribution in the breakup reaction which can influence the extracted astrophysical S17 factor. Preliminary results are in good agreement with recent direct studies leading to a lower value of the astrophysical S17 factor value.

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

[2] N. Iwasa et al., Phys. Rev. Lett. 83, 2910 (1999).

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