Berlin 2005 – wissenschaftliches Programm

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HK: Physik der Hadronen und Kerne

HK 13: Kern- und Teilchen-Astrophysik

HK 13.7: Vortrag

Freitag, 4. März 2005, 18:30–18:45, TU MA144

Indirect determination of the astrophysical S₁₇ factor via high-energy Coulomb dissociation of ⁸B — •F. Schümann — Institut für Physik mit Ionenstrahlen, Ruhr-Universität Bochum, Germany

The low-energy ⁷Be(p,g)⁸B cross section is directly linked to the flux of high-energy solar neutrinos and their flavor oscillations. Recently, a new proton-capture measurement on ⁷Be found a low-energy astrophysical S₁₇ factor which differed markedly from previous results [1]. We have measured at GSI the same quantity by a completely different method, Coulomb dissociation of a 254 A MeV radioactive ⁸B beam, and studied the angular correlations of the breakup particles, p and ⁷Be. We could show that these angular correlations can be explained to good accuracy by pure E1 multipolarity [2]. From a recent reanalysis of our data we obtained results that are in good agreement with those of Ref.[1]. These results also compare favorably with recent theoretical predictions for S₁₇.

[1] A.R. Junghans et al., Phys. Rev. C 68, 065803 (2003).

[2] F. Schümann et al., Phys. Rev. Lett. 90, 232501 (2003).