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
- OSTI ID:
- 6449785
- Journal Information:
- Nucl. Technol.; (United States), Vol. 62:2
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
FAST NEUTRONS
NEUTRON SPECTROSCOPY
NEUTRON SPECTROMETERS
GRAPHITE
MEASURING METHODS
NEUTRON BEAMS
NEUTRON SPECTRA
SCATTERING
SLOWING-DOWN
SPECTRA UNFOLDING
TARGETS
BARYONS
BEAMS
CARBON
DATA PROCESSING
ELEMENTAL MINERALS
ELEMENTARY PARTICLES
ELEMENTS
FERMIONS
HADRONS
MEASURING INSTRUMENTS
MINERALS
NEUTRONS
NONMETALS
NUCLEON BEAMS
NUCLEONS
PARTICLE BEAMS
PROCESSING
SPECTRA
SPECTROMETERS
SPECTROSCOPY
440103* - Radiation Instrumentation- Nuclear Spectroscopic Instrumentation
654003 - Radiation & Shielding Physics- Neutron Interactions with Matter