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Abstract

Excitation functions were measured for the (50)Cr(n,np+pn+d)(49)V, (58)Ni(n,alpha)(55)Fe, (58)Ni(n,alphap+palpha)(54)Mn and (62)Ni(n,alpha)(59)Fe reactions from 7.5 MeV to 19.4 MeV. Use was made of the activation technique in combination with non-destructive high-resolution gamma-ray spectrometry or X-ray spectrometry after radiochemical separation and thin sample preparation. Quasi-monoenergetic neutrons produced via the (2)H(d,n)(3)He and (3)H(d,n)(4)He reactions were used to irradiate samples of metallic natural chromium and nickel. The neutron flux densities were determined via the (27)Al(n,alpha)(24)Na (for E(n) < 12.5 MeV) and (93)Nb(n,2n)(92m)Nb (for E(n) > 12.5 MeV) monitor reactions. Apart from the (58)Ni(n,alphap+palpha)(54)Mn reaction, the results represent the first cross sections beyond 15 MeV. The values for the (58)Ni(n,alpha)(55)Fe reaction between 7.5 MeV and 12.3 MeV are lower than those in an earlier activation experiment but support the lower trend of literature values determined via the charged particle detection method. A renormalization of the earlier activation data with respect to the more recent monitor cross section values reduces the discrepancy. Statistical model calculations incorporating precompound effects were found to be in good agreement with the present data, showing that both first and second chance emission of nucleons are treated satisfactorily in the calculations.

Additional information

Authors: FESSLER A, JRC Geel (BE);QAIM S M, Forschungszentrum Jülich GmbH, Institut für Nuklearchemie (DE)
Bibliographic Reference: Article: Radiochimica Acta (1998)
Record Number: 199811093 / Last updated on: 1998-09-28
Category: PUBLICATION
Original language: en
Available languages: en