MEASUREMENTS OF THE S-32(N,P)P-32 AND CL-35(N,ALPHA)P-32 REACTION CROSS-SECTIONS IN THE ENERGY-RANGE OF 13.3-14.9 MEV AND THEIR INTEGRAL TEST BELOW 14 MEV

The reaction cross sections of S-32(n,p)P-32 and Cl-35(n,alpha)P-32 we re measured in the energy range 13.3-14.9 MeV using the D-T neutron so urce of the FNS (Fusion Neutron Source) facility. The activation techn ique, in combination with the Cherenkov radiation counting of P-32 act ivity in aqueous solution, was employed. The cross sections were deter mined relative to the Nb-93(n,2n)Nb-92m cross section. The obtained da ta were compared with latest evaluations as well as with experimental data in the literature. An integral experiment was performed in order to verify the cross sections for the S-32(n,p)P-32 and Cl-35(n,alpha)P -32 reactions in the following comprehensive activation libraries: JEN DL Activation File, ADL-3T, EAF-3.1 and FENDL/A-1.0. Reaction rates fo r the two reactions were measured in five different neutron fields gen erated in a beryllium assembly bombarded by D-T neutrons, and the expe rimental values were compared with those calculated with the four libr aries. As a result, it was found that the evaluated cross sections for S-32(n,p)P-32 in JENDL, EAF and FENDL and those for Cl-35(n,alpha)P-3 2 in EAF and FENDL were valid over the energy range from their thresho ld energies to 15 MeV while the others were not. (C) 1997 Elsevier Sci ence S.A.