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Study on accuracy improvement of fast-neutron capture reaction data of long-lived MA for development of nuclear transmutation systems, 2; Development of a neutron beam filter system at ANNRI in J-PARC

Rovira Leveroni, G.  ; Katabuchi, Tatsuya*; Iwamoto, Osamu ; Kimura, Atsushi  ; Nakamura, Shoji ; Iwamoto, Nobuyuki ; Endo, Shunsuke  ; Terada, Kazushi*; Kodama, Yu*; Nakano, Hideto*; Hori, Junichi*; Shibahara, Yuji*

The double-bunch mode of the J-PARC facility introduces serious ambiguities in the neutron induced cross-section measurement in the fast neutron energy region. The neutron filtering technique is applied in the ANNRI beamline in order to produce quasi-monoenergetic neutron beams. In this work, three different filter configurations consisting of 20 cm of $$^{nat}$$Fe and 20 and 30 cm of $$^{nat}$$Si were used to test their performance as neutron filters by means of capture and transmission experiments and using the Monte-Carlo simulation code PHITS. The characteristic of the three neutron filter configuration are presented and their viability as a neutron filter is discussed from the results of the present work.

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