Low-energy neutron spectrometer and its application for 252Cf neutron spectrum measurements

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 293; no. 3; pp. 555 - 561
• Main Authors: Lajtai, A., Dyachenko, P.P., Kononov, V.N., Seregina, E.A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.08.1990
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/0168-9002(90)90323-X

A time-of-flight spectrometer with a relatively thick 6Li glass scintillator for neutron detection and an ionization chamber containing minimal built-in material for fission fragment detection were used for low-energy fission neutron spectrum determination. The efficiency of a 0.95 cm thick NE 912 glass neutron detector was determined independently by using 0.0835 cm thin glass detector as a reference, whose efficiency was determined by Monte Carlo calculations. New efficiency data are given for a thin 6Li glass detector, and the measured efficiencies for a thick glass detector and the californium neutron energy spectrum at low energies are presented. The measured neutron energy spectrum can be well described by the complex evaporation model.