SYMPOSIA PAPER Published: 01 January 2001

A Novel Neutron Spectrometer with Response of Wide Energy Range


A neutron spectrometer has been developed to measure energy spectra of neutrons in the energy range from thermal to a few tens MeV. The detector consists of a spherical polyethylene moderator with a diameter of 30 cm and 19 pairs of 6Li- and 7Li-glass scintillators arranged along the orthogonal x-, y-, and z-axes of the sphere. The pairs can obtain the thermal neutron flux distribution in the sphere. The energy spectrum of the incident neutrons can be extracted from the information on the thermal neutron flux distribution in the moderator.

The detector characteristics have been examined with the Monte Carlo simulations and the experiments using monoenergetic neutrons. The response obtained by the experiments and that by the simulations show good agreement. The energy spectra of the monoenergetic neutron beams have been obtained by using the unfolding codes, SAND2 and J-log with the response function obtained with the simulations. In spite of white initial guess spectra, the unfolded energy spectra agree well with the true ones.

Author Information

Uritani, A
Nagoya University, Nagoya, Japan
Makihara, Y
Nagoya University, Nagoya, Japan
Yamaguchi, S
Nagoya University, Nagoya, Japan
Kawarabayashi, J
Nagoya University, Nagoya, Japan
Iguchi, T
Nagoya University, Nagoya, Japan
Mori, C
Aichi Institute of Technology, Toyota, Japan
Toyokawa, H
Electrotechnical Laboratory, Tsukuba, Japan
Takeda, N
Electrotechnical Laboratory, Tsukuba, Japan
Kudo, K
Electrotechnical Laboratory, Tsukuba, Japan
Sato, O
Mitsubishi Research Institute Inc., Tokyo, Japan
Iwai, S
Nuclear Development Co., Omiya, Japan
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Developed by Committee: E10
Pages: 698–705
DOI: 10.1520/STP13659S
ISBN-EB: 978-0-8031-5450-6
ISBN-13: 978-0-8031-2884-2