Measurements of the ( n, np+ d) activation cross sections with 13.4–14.9 MeV neutrons using a fusion neutronics source/JAERI

Abstract

The activation cross sections for 20 ( n, np+ d) reactions were measured in the energy range between 13.4 and 14.9 MeV by the activation method. The mass-separated isotopes of 87Sr, 95,100Mo, 104Ru, 106Pd, 113,116Cd, 118,119,120Sn, 123,128,130Te, 184,186W, and 189,190Os were irradiated. The 16 cross sections, excepting those for 118Sn, 128Te and 184,186W, were obtained for the first time. The d–T neutron source of the fusion neutronics source (FNS) at the Japan Atomic Energy Research Institute (JAERI) was used for irradiation. All cross section values were determined relative to that of the 27Al ( n, α) 24Na reaction (ENDF/B-VI). To measure weakly induced activities, an efficiency calibration technique with a well-type HPGe detector was applied. The present results were compared with the comprehensive evaluated data in the JENDL-3.3, the JENDL-Activation File, the ENDF/B-VI and the FENDL/A-2.0. Most of the data in the JENDL-3.3 and the JENDL-Activation File were in good agreement with the present result. However, relative to our values, 13 of the 20 evaluated data in FENDL/A-2.0 were overestimated more than 2 times or underestimated by less than one tenth.