Neutron capture measurements using the 4 Ge detector for Au and Ag

Harada, Hideo   ; Kitatani, Fumito  ; Toh, Yosuke   ; Kimura, Atsushi   ; Nakamura, Shoji  ; Furutaka, Kazuyoshi  ; Koizumi, Mitsuo ; Oshima, Masumi; Mizumoto, Motoharu*; Igashira, Masayuki*; Osaki, Toshiro*; Hori, Junichi*; Goto, Jun*

The rays produced by neutron capture reactions for Au and Ag samples were measured using the 4 Ge spectrometer in the resonance region in a time-of-flight (TOF) mode. Two dimensional matrices for TOF and summed Ge pulse heights were produced to analyze the data. From the analyses of the matrices, the origin of each resonance peak is identified. For example, the resonance of Ag-107 and Ag-109 were clearly separated in the measurement of Ag-nat sample by gating at the neutron separation energy for each isotope. Furthermore, the -ray spectrum for each resonance is deduced from the matrices. The potential of the 4 Ge detector as the high-energy-resolution total energy absorption detector is demonstrated using the TOF data obtained for Au and Ag.