The prompt gamma rays from the neutron capture reactions by 91Zr and 96Zr were measured. A neutron time-of-flight (TOF) method was adopted with a 4π Ge spectrometer installed at the Accurate Neutron-Nucleus Reaction measurement Instrument (ANNRI) in the J-PARC Material and Life science experimental Facility (MLF). The gamma-ray pulse-height spectra corresponding to the 292-eV resonance of 91Zr and the 301-eV resonance of 96Zr were obtained by gating on the TOF regions, respectively. The relative intensities of those transitions were derived. Moreover, we have demonstrated the nuclide discrimination technique by identifying 91Zr resonances (isotopic composition of 5.3%) in the measurement of 96Zr sample. This technique can be applicable to the neutron capture measurement for a small amount of sample expected in case of long-lived fission products (LLFPs) such as 93Zr.
All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)