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Bochum 1998 – scientific programme

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HK: Hadronen und Kerne

HK 31: Nuclear Astrophysics II

HK 31.2: Talk

Tuesday, March 17, 1998, 14:15–14:30, G

Determination of the 37Ar(nth,α)34S and 37Ar(nth,p)37Cl cross sections — •Ronald Bieber1, Cyriel Wagemans2, Heinz Oberhummer3, Marc Loiselet4, Michel Gaelens4, Bruno Denecke1, Jan Wagemans1, and Peter Geltenbort51Institute for Reference Materials and Measurements, Retieseweg, B-2440 Gent — 2Dept. of Subatomic and Radiation Physics, University of Gent, Proeftuinstraat 86, B-9000 Gent — 3T.U. Vienna, Austria — 4Universite Catholique de Louvain, Belgium — 5Institut Laue-Langevin, BP 156, F38042 Grenoble Cedex 9, France

37Ar was produced at the cyclotron of the U.C.L. via the 37Cl(p,n)37Ar reaction. Several samples were prepared by implanting 37Ar-ions in a thin aluminium foil, with a number of atoms varying between 1014 and 2×1015. These samples were used at a thermal neutron guide of the High Flux Reactor of the ILL (Grenoble) for the study of the 37Ar(nth,α)34S and 37Ar(nth,p)37Cl reactions. The charged particles emitted were detected with suited Si surface barrier detectors. The flux calibration was done using a well-defined 235U layer and relying on the 235U(nth,f) reference cross-section. In this way we obtained a value of (1070±70)b for the 37Ar(nth,α) and (37±3)b for the 37Ar(nth,p) cross-section. These results are about two times smaller than the corresponding values reported by Asghar et al, Z. Phys. A288(1978)45.

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