Calculation and evaluation of cross sections and kerma factors for neutrons up to 100 MeV on carbon

Journal Article · Wed May 01 04:00:00 EDT 1996 · Nuclear Science and Engineering

OSTI ID:264350

Chadwick, M B; Cox, L J ^[1]; Young, P G ^[2]; Meigooni, A S ^[3]

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1. Lawrence Livermore National Lab., CA (United States)
2. Los Alamos National Lab., NM (United States)
3. Univ. of Kentucky, Lexington, KY (United States). Dept. of Radiation Medicine

The authors present an evaluation of the interaction of neutrons with energies between 20 and 100 MeV with carbon nuclei. The aim is to accurately represent integrated cross sections, inclusive emission spectra, and kerma factors, in a data library for use in radiation transport simulations of fast neutron radiotherapy. They apply the Feshbach-Kerman-Koonin-GNASH nuclear model code, which includes Hauser-Feshbach, pre-equilibrium, and direct reaction mechanisms, and use experimental measurements to optimize the calculations. They determine total, elastic, and nonelastic cross sections; angle-energy-correlated emission spectra for light ejectiles with A {le} 4 and gamma rays; and average energy depositions. Coupled-channel optical model calculations describe the total, elastic, and nonelastic cross sections well. The results for charged-particle emission spectra agree fairly well with University of California-Davis as well as new Los Alamos National Laboratory and Louvain-la-Neuve measurements. They compare the results with the recent ENDF/B-VI evaluation and argue that some of the exclusive channels between 20 and 32 MeV should be modified. They also compare kerma factors derived from the evaluated cross sections with the measurements, providing an integral benchmark for the work. The evaluated data libraries are available as electronic files.

• DOE Contract Number: W-7405-ENG-48; W-7405-ENG-36
• OSTI ID: 264350
• Journal Information: Nuclear Science and Engineering, Journal Name: Nuclear Science and Engineering Journal Issue: 1 Vol. 123; ISSN NSENAO; ISSN 0029-5639
• Country of Publication: United States
• Language: English

Related Subjects

55 BIOLOGY AND MEDICINE
BASIC STUDIES
66 PHYSICS
CARBON
COMPARATIVE EVALUATIONS
CROSS SECTIONS
EMISSION SPECTRA
ENERGY ABSORPTION
KERMA
NEUTRON REACTIONS
NEUTRON THERAPY
NUCLEAR DATA COLLECTIONS
NUCLEAR REACTION YIELD