Neutron capture cross sections of curium isotopes measured with ANNRI at J-PARC

Kawase, Shoichiro* ; Kimura, Atsushi   ; Harada, Hideo   ; Iwamoto, Nobuyuki  ; Iwamoto, Osamu  ; Nakamura, Shoji  ; Segawa, Mariko   ; Toh, Yosuke   

The neutron capture cross sections of Cm and Cm were measured for the neutron energy range of 1-1000 eV via the neutron time-of-flight method with ANNRI at MLF of the J-PARC. The world's most intense neutron pulses from the Japan Spallation Neutron Source enable the accurate measurement of neutron capture cross sections. Besides, single-bunched neutron pulses allow the analysis in a higher neutron energy region than the previous measurement at ANNRI. The resonance analyses were performed up to 1000 eV by using a resonance shape analysis code REFIT. The spectra of prompt gamma-rays from neutron capture reactions of Cm and Cm were also obtained, and 43 and 10 prompt gamma-ray peaks from Cm(n,) and Cm(n,) reactions were newly observed, respectively.