Investigation of the Ar-37(n, p)Cl-37 and Ar-37(n, alpha) S-34 reactions in the neutron energy range from 10 meV to 100 keV

The Ar-37(n, p)Cl-37 and Ar-37(n, alpha)S-34 reactions were studied for the first time as a function of the neutron energy at the neutron spectrometer GELINA at the IRMM in Geel (Belgium). For the Ar-37(n, alpha)S-34 reaction , cross section data were obtained covering the neutron energy region from 10 meV up to 100 keV, but the sensitivity was too low to observe the Ar-37( n, p)Cl-37 reaction. In the low energy region, the (n, alpha) cross-section was shown to have a 1/v shape, while in the keV region several resonances were determined and subsequently analysed. Finally, the Maxwellian averaged cross section value was calculated at astrophysically relevant temperature s. (C) 2000 Elsevier Science B.V. All rights reserved.