Measurement of Neutron-Induced Reaction Cross Sections on Ni, Zr, Ta, and W Isotopes with Activation Technique

Neutron-induced reaction cross sections on different Ni, Zr, Ta, and W isotopes were determined at the Institute for Reference Materials and Measurements, Geel by the activation method. The irradiations were carried out at the 7 MV Van de Graaff accelerator. Quasi mono-energetic neutrons with energies between 14 and 21 MeV were produced via the 3H(d,n)4He reaction (Ed=1,2,3, and 4 MeV). Both natural and isotopicaly enriched samples were used in order to distinguish between activities produced by different reactions leading to the same end product. The radioactivity of the samples was determined by gamma-ray spectrometry. Monte Carlo simulations of the full-energy peak and total efficiencies of a coaxial HPGe detector were performed with the MCNP/MCNPX code in order to achieve higher geometry flexibility and better accuracy. All reaction cross sections measured in the present work are referenced to the 27Al(n,a)24Na standard reaction cross sections. The measurement results are compared with work by other authors, current evaluated data files and new model calculations.

SEMKOVA Valentina;  MOENS Andre;  PLOMPEN Arjan;  JAIME TORNIN Ricardo; 

2009-07-27

Paul Scherrer Institut

JRC50473