Elastic and inelastic neutron scattering angular distributions were measured on natural carbon samples to confirm existing experimental data and evaluations in the fast neutron region and to guide improvements in resonance parameters, where needed. Sixty-four (n,n′) differential cross section measurements were performed at 45 incident neutron energies between 0.5 and 8.0 MeV. Experimental angle-integrated elastic scattering cross sections are consistent with ENDF/B-VIII.0 values with the exception of the region from 3.2 to 4.0 MeV where our results are ∼3% higher. In the 3.4 to 3.6 MeV region our differential cross sections are slightly lower at forward angles and somewhat higher at backward angles than the ENDF/B-VIII.0 calculations; however, our results are consistent with measured data from other research groups. The first- through fourth-order elastic scattering Legendre coefficients from fits to these experimental data are consistent with ENDF/B-VIII.0 values across this range of incident neutron energies. Inelastic scattering cross sections were measured at 12 incident neutron energies between 5.6 and 7.8 MeV. Angle-integrated cross sections agree well with the 1978 Perey and ENDF/B-VIII.0 values; however, the angular-distribution shapes deviate somewhat from the ENDF/B-VIII.0 calculations. These data will allow refinement of the resonance parameter description in this difficult energy region.
|Journal||Nuclear Physics A|
|State||Published - Jul 2022|
Bibliographical noteFunding Information:
Research at the University of Kentucky Accelerator Laboratory is supported by contracts from the U.S. Department of Energy programs NNSA-SSAP award NA-0002931 , Nuclear Energy Universities Program award NU-12-KY-UK-0201-05 , and the Office of Nuclear Physics awards DE-20SSC000056 , DE-SC0021243 , DE-SC0021175 , and DE-SC0021424 . Support also was received from the Donald A. Cowan Physics Fund at the University of Dallas, and in part by the National Science Foundation grant PHY-1913028 . Isotope(s) used in this research were supplied by the U.S. Department of Energy Isotope Program, managed by the Office of Isotope R&D and Production. The authors also acknowledge the many contributions of H.E. Baber to these measurements.
- Differential cross sections
- Legendre coefficients
- Neutron elastic and inelastic scattering
ASJC Scopus subject areas
- Nuclear and High Energy Physics