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Studies of excitation functions of fast neutron-induced reactions are of considerable interest in testing nuclear models. However, extensive data exist only around 14 MeV. In the energy ranges 8-13 MeV and 15-20 MeV relatively few measurements have been done and the results are often inconsistent. Different cross section evaluations, mostly based on model calculations, differ frequently by a factor of 2-3. Since in the energy region up to 20 MeV many reaction channels are open [e.g., elastic and inelastic scattering, radiative capture, (n,2n), (n,p), (n,a), (n,np), (n,d), (n,na), etc.], different reaction mechanisms need to be considered (compound, precompound and direct interactions). For nuclear reaction model calculations several computer codes, based mainly on compound-precompound mechanisms, are available but the parametrization is often uncertain. Therefore more experimental data are needed to test the model parametrizations. Of special interest are investigations on a series of isotopes of a particular target element or a particular mass region to develop such parameters in a systematic way and thus to improve the reliability of extrapolations based on these models. We chose to investigate the excitation functions of (n,2n), (n,p), (n, np), and (n, a) reactions on (52)Cr, (53)Cr and (54)Cr which lead to radioactive products and are thus measurable via the activation method. Special emphasis was given to those energy regions where no data existed. Apart from this fundamental interest, the activation data on chromium are important for practical applications in fusion (e.g., estimation of activity level, hydrogen and helium gas production, nuclear heating, and radiation damage) since chromium is an important constituent of structural steel.

Additional information

Authors: FESSLER A, Institut f³r Nuklearchemie, Forschungszentrum J³lich GmbH (DE);QAIM S-M, Institut f³r Nuklearchemie, Forschungszentrum J³lich GmbH (DE);WATTECAMPS E, JRC-IRMM, Geel (BE);SMITH D-L, Argonne National Laboratory, Technology Development Division, Argonne, Illinois (US)
Bibliographic Reference: Article: Physical Review, Vol. 58, No. 2 (1998) pp. 996-1004
Availability: Physical Review (Journal)
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