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Report No.

Measurement of neutronic characteristics in JSNS and its improvement

Harada, Masahide   ; Oikawa, Kenichi   ; Maekawa, Fujio  ; Meigo, Shinichiro   ; Futakawa, Masatoshi  

To validate the neutronics design of JSNS, we have measured neutron spectra at all available neutron beam lines by a current-mode TOF (C-TOF) method. Measured values were in good agreement with evaluated ones for beam lines without guide tubes. Some discrepancies in spectral intensity were found in some of beam lines using a neutron guide tube. This result indicates that the C-TOF method is very useful for checking initial installation of beam lines because neutron spectral intensity can be measured systematically in a short time (several shots). On the other hands, we also found that the C-TOF method had larger measurement error than pulse counting type detector. Therefore, to reduce measurement error, we had additional experiments. It was found that measured Li-6 contents in scintillators were different from values in specification data sheets. Then, amount of charge produced in photomultiplier by a detected neutron was measured. As a result, the measurement error could be reduced.



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