System preparation and fast neutron spectra measurement in a graphite stack
A 95- X 95- X 95-cm nuclear grade graphite stack was bombarded with a well-collimated monoenergetic 14.75- + or - 0.05-MeV fast neutron beam from a tritium target of a neutron generator. The neutron spectra measured in such types of integral experiments are susceptible to the various neutron interactions (elastic and inelastic scattering by the first few excited levels including anisotropy of angular distributions). This, in turn, facilitates identification and treatment of discrepancies between the experimental and calculational results. The neutron spectra were measured with a 50- X 50-mm NE-213 liquid scintillator using the pulse shape discrimination technique to reject gamma-ray counts. The linearity test of the neutron spectrometer was performed by means of radioactive gamma-ray sources and D(d,n)He/sup 3/ and T(d,n)He/sup 4/ neutrons. Amplification factors (in light units per channel) were achieved with a /sub 11/Na/sup 22/ radioactive source. The spectrometer was checked with the D(d,n)He/sup 3/, T(d,n)He/sup 4/ reactions and an americium-beryllium radioactive neutron source. The measured proton recoil spectra were unfolded in the neutron spectra by the FORIST unfolding code.
- Research Organization:
- Ben-Gurion University of the Negev, Department of Nuclear Engineering, Beer-Sheva, P.O. Box 653
- OSTI ID:
- 5315148
- Journal Information:
- Nucl. Technol.; (United States), Vol. 62:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
74 ATOMIC AND MOLECULAR PHYSICS
GRAPHITE
IRRADIATION
NEUTRON SPECTRA
GRAPHITE MODERATED REACTORS
REACTOR MATERIALS
BEAM INJECTION
ELASTIC SCATTERING
F CODES
FAST NEUTRONS
GAMMA RADIATION
GAMMA SOURCES
HELIUM 3 BEAMS
HELIUM 4 BEAMS
INELASTIC SCATTERING
NEUTRON BEAMS
NEUTRON MONITORS
NEUTRON SOURCES
NEUTRON SPECTROMETERS
SPECTRA UNFOLDING
TRITIUM TARGET
BARYONS
BEAMS
CARBON
COMPUTER CODES
DATA PROCESSING
ELECTROMAGNETIC RADIATION
ELEMENTAL MINERALS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HADRONS
ION BEAMS
IONIZING RADIATIONS
MATERIALS
MEASURING INSTRUMENTS
MINERALS
MONITORS
NEUTRONS
NONMETALS
NUCLEON BEAMS
NUCLEONS
PARTICLE BEAMS
PARTICLE SOURCES
PROCESSING
RADIATION MONITORS
RADIATION SOURCES
RADIATIONS
REACTORS
SCATTERING
SPECTRA
SPECTROMETERS
TARGETS
210300* - Power Reactors
Nonbreeding
Graphite Moderated
210400 - Power Reactors
Nonbreeding
Otherwise Moderated or Unmoderated
640300 - Atomic
Molecular & Chemical Physics