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The 35Cl(n,p)35S and 36Cl(n,p)36S reactions are important for nucleosynthesis calculations, especially for those leading to the rare isotope 36S. Since the available data for the corresponding reaction cross-sections are very poor, an experimental campaign is underway to improve the situation. A first series of measurements was taken at the end of a very clean thermal neutron guide of the high flux reactor of the Institut Laue-Langevin at Grenoble. For the 35Cl(n(th),p) cross-section measurements, three evaporated natural AgCl deposits with different thicknesses were used and the 0.6 MeV protons were detected with a 15 micron thin totally depleted surface barrier detector. In addition, three AgCl deposits with a 36Cl content of 0.636% were used in the same set-up. This resulted in an accurate 35Cl(n(th),p) cross-section of (440+/-10)mb, which is somewhat lower than the evaluated value of (489+/-14)mb. The three last deposits were then used to study the 36Cl(n(th),p)36S reaction. The 1.9 MeV protons were identified, resulting in a thermal cross-section value of (46+/-2)mb. This result is one order of magnitude smaller than the only other available value of (0.4+/-0.1)b reported by Andrezjewski et al. (JINR Dubna Report P3-87-319, 1987). A second series of experiments is being performed at GELINA, permitting high resolution spectroscopy with keV-neutrons. Preliminary results are reported.

Additional information

Authors: DRUYTS S, JRC Geel (BE);WAGEMANS C, University of Gent, Nuclear Physics Laboratory, Gent (BE);GELTENBORT P, Institut Laue-Langevin, Grenoble (FR);SCHILLEBEECKX P, JRC Ispra (IT)
Bibliographic Reference: Paper presented: 16th General Assembly of the European Geophysical Society, Wiesbaden (DE), April 22-26, 1991
Availability: Available from (1) as Paper EN 36088 ORA
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