A study was conducted to demonstrate the results of the capture cross section measurement for highly radioactive 244Cm obtained using the 4π Ge spectrometer. Neutron capture measurements with a time-of-flight (TOF) technique were carried out for a 244Cm sample, using neutron-nucleus reaction instrument (NNRI) installed at the Beam Line No. 4 (BL04) of the Materials and Life Science Experimental Facility (MLF) in the Japan Proton Accelerator Research Complex (J-PARC). A disk chopper with a semicircular shape was used to prevent the intrusion of the low-energy tail of a neutron pulse into the next pulse duration. The TOF spectrum for the Cm sample measured, using the 4π Ge spectrometer revealed the first experimental data in the world wherein the neutron capture resonances were observed below 20 eV. The neutron energy was calibrated by measuring a Au sample with neutron resonances, while the dead time of detectors was deduced by comparing the number of random timing pulses from the random pulse generator with the number of measured pulses.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Nuclear Energy and Engineering