Abstract Neutrons are detected in a small Li6I(Eu) scintillator placed at the center of polyethylene moderating spheres with sizes ranging from 2 to 12 inches in diameter. The efficiency of this neutron counter has been experimentally determined using monoenergetic neutrons from thermal energies to 15 MeV. The counter has excellent energy sensitivity from 0.1 to 2 MeV and is particularly useful for determining the shapes of continuous neutron spectra. The pronounced difference in the efficiencies for the five sizes of spheres which have been calibrated provides a basis for accurate neutron energy determination. The good γ ray discrimination of the counter allows it to be used with a radium-beryllium neutron source. Neutron spectra from a variety of sources have been determined with this counter. These include the two groups of neutrons from the C14(p,n)N14 reaction, the evaporation spectrum of the neutrons from the reaction Rh103(p,n)Pd103, the energy spectra of inelastically scattered neutrons, and the neutron spectrum from the scattering of fast neutrons by the floor and walls of a building.
[1]
C. H. Johnson,et al.
Proton‐Recoil Neutron Spectrometer
,
1956
.
[2]
A. O. Hanson,et al.
A Neutron Detector Having Uniform Sensitivity from 10 Kev to 3 Mev
,
1947
.
[3]
J. S. Levin,et al.
INELASTIC SCATTERING OF NEUTRONS FROM IRON BY TIME-OF-FLIGHT
,
1955
.
[4]
J. P. Conner,et al.
Preparation of Thin Tritium Targets
,
1951
.
[5]
A. Hemmendinger,et al.
Reaction Constants for Li 7 (p,n)Be 7
,
1948
.
[6]
Robert H. Davis,et al.
STUDY OF THE NEUTRON REACTIONS Li$sup 6$(n,/cap alpha/)H$sup 3$, F$sup 19$(n,$gamma$)F$sup 20$ AND I$sup 127$(n,$gamma$)I$sup 12$$sup 8$
,
1959
.
[7]
J. E. Brolley,et al.
MONOENERGETIC NEUTRON TECHNIQUES IN THE 10- TO 30-MEV RANGE
,
1956
.
[8]
R. L. Bramblett,et al.
Neutron evaporation spectra from (p, n) reactions
,
1960
.