Abstract
Broad energy distributions in fast neutron beams have been achieved by appropriate filtering of the236U fission radiation provided from the RENT converter facility at the FRM research reactor. Transmission measurements in such beams result in average cross sections to which resonance reactions and shape elastic scattering contribute. We used a silicon (124.5 cm) filtered beam with a median energy of 143 keV (width 20 keV) and beams with 1.3 MeV (0.55 to 3 MeV) and 2.1 MeV (1 to 5.5 MeV) obtained through different filter combinations of lead and polyethylene. The relative high energies and the broad spectra made it possible to determine experimentally the contributions ofs- andp-wave resonance reactions to the average cross section even for light nuclei. Using the three different beams we determined the average cross sections for the elements in the mass regionA=9 to 65. Analysing the measured cross sections by means of theR matrix formalism provided a complete set ofp-wave strength functions and distant level parameters. Moreover, single particle shell effects in the cross sections were observed. In conclusion we obtained informations on the 2P and the 3S size resonances and about the validity of the optical model for neutron reactions with light nuclei.
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Work partially supported by the Bundesministerium für Forschung und Technologie
The continous assistence by the reactor staff and the support of the “Bundesministerium für Forschung und Technologie” are appreciated. We are thankful to Dr. N. Tubbs, NEA DATA BANK, for lending the ENDF/B-IV file to us.
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Koester, L., Waschkowski, W., Meier, J. et al. Experimental study onp-wave neutron strength functions for light nuclei. Z. Physik A - Atomic Nuclei 330, 387–395 (1988). https://doi.org/10.1007/BF01290124
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DOI: https://doi.org/10.1007/BF01290124