Study of (n,p) and (n,alpha) reactions related to astrophysics
Whenever (n,p) and (n,alpha) reactions on light nuclei reveal a high reaction cross-section with keV neutrons, they are likely to be interesting for nuclear astrophysics. Indeed, a neutron energy of 35 keV corresponds to a stellar temperature of roughly 4.10(8) K, which is a typical temperature for the red giant phase in stars. Important destructive reactions in this energy region will have a direct impact on the abundances of the naturally occurring isotopes obtained via explosive nucleosynthesis calculations. Very important reactions in this respect are 26Al(n,p)26 Mg, 33S(n,alpha)30Si, 36Cl(n,p)36S, 40K(n,p)40Ar, 40K(n,alpha)37Cl and 41Ca(n,alpha)38Ar. These reactions are studied under two different experimental conditions. At a clean and very intense thermal neutron guide of the high flux reactor of the ILL (Grenoble) the thermal neutron induced reaction cross-sections are determined, which can be used later for the normalisation of measurements with higher energy neutrons. At the linear accelerator (GELINA) of the CBNM (Geel), which provides excellent conditions for high resolution measurements with resonance and keV-neutrons, the keV-neutron energy region is investigated in detail.
Bibliographic Reference: Paper presented: General Scientific Meeting of the Belgian Physical Society, Louvain-la-Neuve (BE), May 31 - June 1, 1990
Availability: Text not available
Record Number: 199011740 / Last updated on: 1994-12-02
Original language: en
Available languages: en