Characterization of germanium detectors for the measurement of the angular distribution of prompt -rays at the ANNRI in the MLF of the J-PARC

Takada, Shusuke*; Okudaira, Takuya*; Goto, Fumiya*; Hirota, Katsuya*; Kimura, Atsushi   ; Kitaguchi, Masaaki*; Koga, Jun*; Nakao, Taro*; Sakai, Kenji ; Shimizu, Hirohiko*; Yamamoto, Tomoki*; Yoshioka, Tamaki*

In this study, the germanium detector assembly, installed at the Accurate Neutron Nuclear Reaction measurement Instruments (ANNRI) in the Material and Life Science Facility (MLF) operated by the Japan Proton Accelerator Research Complex (J-PARC), has been characterized for extension to the measurement of the angular distribution of individual -ray transitions from neutron-induced compound states. We have developed a Monte Carlo simulation code using the GEANT4 toolkit, which can reproduce the pulse-height spectra of -rays from radioactive sources and (n,) reactions. The simulation is applicable to the measurement of -rays in the energy region of 0.5-11.0 MeV.