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Report No.

Response function for the measurement of (n,$$gamma$$) reactions with the ANNRI-Cluster Ge detectors at J-PARC

Hara, Kaoru; Goko, Shinji*; Harada, Hideo  ; Hirose, Kentaro ; Kimura, Atsushi  ; Kin, Tadahiro*; Kitatani, Fumito ; Koizumi, Mitsuo ; Nakamura, Shoji ; Toh, Yosuke  ; Igashira, Masayuki*; Katabuchi, Tatsuya*; Kino, Koichi*; Kiyanagi, Yoshiaki*; Hori, Junichi*

Recently, neutron shields of a large Ge detector array at the Accurate Neutron-Nucleus Reaction Measurement Instrument (ANNRI) in the Japan Proton Accelerator Research Complex (J-PARC) were modified to suppress the background from boron rubber sheets to enriched $$^{6}$$LiF tiles. For the new experimental set-up, efficiencies and response functions of the cluster Ge detectors with the BGO anti-coincidence detectors were measured with $$gamma$$-rays from standard sources and prompt $$gamma$$-rays from the $$^{28}$$Si(n,$$gamma$$) and $$^{35}$$Cl(n,$$gamma$$) reactions. The simulation parameters were adjusted with the EGS5 code so as to reproduce the data set of efficiencies and response functions. Based on this information, a pulse height weighting function will be deduced in the energy range of 0.1-10 MeV.



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