Abstract
The neutron capture cross section measurement on 91Zr was performed at neutron TOF beam line ANNRI installed at J-PARC/MLF. Prompt capture gamma rays from the sample were detected with an array of large Ge detectors at a distance of 21.5 m from the spallation neutron source by the time-of-fligh (TOF) method. The neutron capture gamma-ray pulse-height spectra from the 182-eV p-wave resonance and the 292-eV s-wave resonance were obtained by gating on the TOF regions, respectively. Though the decay patterns of primary transitions from the capture state were quite different between resonances, the prominent characteristics common to both resonances was the very strong ground-state transition from the 935-keV state. Therefore, a ground-state transition method was applied to obtain the capture yield, so that the background components due to impurities were successfully eliminated. The preliminary result of the neutron capture cross section for 91Zr up to 5 keV is presented.
Highlights
Accurate neutron capture cross sections of long-lived fission products (LLFPs) are required for the nuclear transmutation study
The neutron capture cross sections of stable zirconium isotopes are important because those produced in fission reactors accompany 93Zr to the transmutation system and affects the transmutation performance
Zirconium alloy which has very low neutron capture cross sections in thermal energy region, high hardness and corrosion resistance is largely used as a cladding material of fuel rods in nuclear reactors
Summary
Accurate neutron capture cross sections of long-lived fission products (LLFPs) are required for the nuclear transmutation study. The neutron capture cross sections of stable zirconium isotopes are important because those produced in fission reactors accompany 93Zr to the transmutation system and affects the transmutation performance. Zirconium alloy which has very low neutron capture cross sections in thermal energy region, high hardness and corrosion resistance is largely used as a cladding material of fuel rods in nuclear reactors. The neutron capture cross sections of stable zirconium isotopes contribute the neutron balance in the reactor. From the viewpoints mentioned above, a systematic measurement of neutron capture cross sections and capture gamma-ray spectra of zirconium stable isotopes as well as 93Zr has been started. Since 91Zr is around the closed shell of 90Zr with a doublemagic number, the neutron capture gamma-ray transition with single-particle behaviour can be expected
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