Neutron Beam Filter System for Fast Neutron Cross-Section Measurement at the ANNRI Beamline of MLF/J-PARC

Gerard Rovira,Atsushi Kimura,Shoji Nakamura,Shunsuke Endo,Osamu Iwamoto,Nobuyuki Iwamoto,Tatsuya Katabuchi,Yu Kodama,Hideto Nakano,Jun-ichi Hori,Yuji Shibahara,Terada Kazushi

Nuclear instruments and methods in physics research Section A, Accelerators, spectrometers, detectors and associated equipment/Nuclear instruments & methods in physics research Section A, Accelerators, spectrometers, detectors and associated equipment（2021）

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摘要

A neutron filtering system has been designed and implemented in the Accurate Neutron -Nucleus Reaction Measurement Instrument (ANNRI) beamline in the Materials and Life Science (MLF) facility of the Japan Proton Accelerator Research Complex (J-PARC) to bypass the effect of the double -bunch mode of J-PARC by molding the incident neutron flux into quasi-monoenergetic neutron beams. Filter assemblies using Fe, Si and Cr as filter materials were analyzed by means of experimental analysis, together with Monte Carlo simulations. The characteristics of the filtered neutron beam are presented and discussed alongside its viability in future applications for neutron cross-section measurements in the keV neutron region.

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关键词

Si neutron filter,Fe neutron filter,Filtered neutron beam,Capture cross-section,Transmission,PHITS,Neutron time-of-flight

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