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Astron. Astrophys. 333, 1112-1116 (1998)

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Experimental cross section of [FORMULA] Sm [FORMULA] Gd and implications
for the p -process

E. Somorjai 1, Zs. Fülöp 1, Á.Z. Kiss 1, C.E. Rolfs 2, H.P. Trautvetter 2, U. Greife 2, M. Junker 3, S. Goriely 4, M. Arnould 4, M. Rayet 4, T. Rauscher 5 and H. Oberhummer 6

1 ATOMKI, P.O. Box 51, H-4001 Debrecen, Hungary
2 Ruhr-Universität, Universitätstrasse 150, D-44780 Bochum, Germany
3 INFN LNGS, Assergi, L'Aquila, Italy
4 Institut d'Astonomie et d'Astrophysique, C.P.226, Université Libre de Bruxelles, bd. du Triomphe, B-1050 Brüssel, Belgium
5 Institut für theoretische Physik, Universität Basel, Klingelbergstrasse 82, CH-4056 Basel, Switzerland
6 Institut für Kernphysik, Technische Universität Wien, Wiedner Hauptstrasse 8-10, A-1040 Wien, Austria

Received 20 October 1997 / Accepted 2 January 1998

Abstract

The cross section of the 144 Sm [FORMULA] Gd reaction has been measured at bombarding energies in the 10.5-13.4 MeV range using an activation method based on the off-line [FORMULA] -activity measurement of the 148 Gd residual nucleus. The long measuring time of the [FORMULA] -decay has required the use of etched track detectors. The resulting cross sections and astrophysical S -factors are compared to new statistical model calculations. The measured data at low energies reflect the strong energy dependence of the optical potential which is found to affect significantly our predictions of the [FORMULA] -capture rate.

Key words: nuclear reactions, nucleosynthesis, abundances – supernovae: general – solar system: general

Send offprint requests to: Zs. Fülöp

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© European Southern Observatory (ESO) 1998

Online publication: April 28, 1998

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