Design of a single moderator-type neutron spectrometer with enhanced energy resolution in energy range from a few to 100 keV

Tanimura, Yoshihiko; Saegusa, Jun; Yoshizawa, Michio; Yoshida, Makoto

Nuclear Instruments and Methods in Physics Research A, 547(2-3), p.592 - 600, 2005/08

https://doi.org/10.1016/j.nima.2005.03.162

The moderator structure of a neutron spectrometer was optimized with a Monte Carlo code of MCNP-4B. The spectrometer consists of a cylindrical moderator and a position-sensitive thermal neutron detector. It can obtain an energy spectrum from thermal neutron distribution along the cylindrical axis of the moderator. The structure of the moderator was improved by putting a low hydrogen density material in the front of a high hydrogen density one and inserting a neutron absorber which eliminated thermal neutrons diffusing in the moderator. These improvements make energy resolution of the spectrometer better especially for the low energy neutrons from a few tens to 100 keV. The designed spectrometer can be applied to the measurement of energy spectrum over a neutron energy range from a few keV to 20 MeV.

Study on Thermal Neutron Spectra in Reactor Moderators by Time-of-Flight Method

Akino, Fujiyoshi

JAERI-M 82-207, 180 Pages, 1982/12

JAERI-M-82-207.pdf:5.16MB

no abstracts in English

Neutron thermalization

Genshiryoku Kogyo, 21(4), p.70 - 74, 1975/04

http://ci.nii.ac.jp/naid/40001072022

no abstracts in English