Investigation of the 35Cl(n,p)35S and 36Cl(n,p)36S reactions as a function of the neutron energy
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.
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
Record Number: 199110855 / Last updated on: 1994-12-02
Original language: en
Available languages: en