Neutron spectra from materials used in fusion and fusion--fission hybrid reactors
The neutron leakage spectra from pulsed spheres of Cu (1.0, 3.0, and 5.0 mean-free-path, mfp), Nb (1.0 and 3.0 mfp), /sup 232/Th (1.0 mfp) and /sup 238/U (0.8 and 2.8 mfp) have been measured using time-of-flight techniques. The neutron spectra from the above materials used in fusion hybrid reactors have been measured between 0.8 and 14 MeV using a stilbene scintillator, pulse shape discrimination and flight paths of around 10 meters. The measured spectra are compared with calculations carried out with TARTNP, a coupled neutron-photon Monte-Carlo transport code. The Lawrence Livermore Laboratory neutron and photon cross sections library (ENDL) and the ENDF/B-IV library have been used in these calculations. The calculated neutron spectra using the ENDL library are in fair agreement with the measurements (5 to 10% discrepancies for the 1-mfp spheres). Calculations for Cu, Nb and Th carried out with the ENDF/B-IV library, badly underestimate the neutron emission between 5 and 10 MeV. The discrepancies with the measurements in this energy region are as large as a factor of two. In order to facilitate the use of these data for calculational purposes by other laboratories, one-dimensional ''experimental'' neutron energy spectra have been generated for each of the above measurements and are available upon request.
- Research Organization:
- California Univ., Livermore (USA). Lawrence Livermore Lab.
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 6380713
- Report Number(s):
- UCRL-81092; CONF-780921-8
- Country of Publication:
- United States
- Language:
- English
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ACTINIDE ISOTOPES
ACTINIDE NUCLEI
ALPHA DECAY RADIOISOTOPES
BARYON REACTIONS
CONFIGURATION
COPPER
ELEMENTS
ENERGY SPECTRA
EVEN-EVEN NUCLEI
HADRON REACTIONS
HEAVY NUCLEI
HYBRID REACTORS
ISOTOPES
MAGNETIC MIRROR TYPE REACTORS
METALS
NEUTRON REACTIONS
NEUTRON SPECTRA
NIOBIUM
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
RADIOISOTOPES
REFRACTORY METALS
SPECTRA
SPHERICAL CONFIGURATION
THERMONUCLEAR REACTORS
THORIUM 232
THORIUM ISOTOPES
TIME-OF-FLIGHT METHOD
TRANSITION ELEMENTS
URANIUM 238
URANIUM ISOTOPES
YEARS LIVING RADIOISOTOPES