21-29 July 2022
US/Pacific timezone

Neutron Capture Cross Section Measurement and Resonance Analysis of Pd-107 Using ANNRI at MLF/J-PARC

26 Jul 2022, 12:27
Capitol ()



Hideto Nakano


The long-term accumulation of Long-Lived Fission Products (LLFPs) in nuclear waste has been a significant issue in nuclear industry due to their long half-life. The nuclear transmutation of LLFPs into short-lived or stable nuclides is expected to contribute reducing the current amount of high-level radioactive waste. Highly accurate nuclear data for the neutron-induced nuclear reactions are necessary in order to design LLFPs nuclear transmutation systems.

Palladium-107 (half life: 6.5×10$^{6}$ y) is one of the important LLFPs, and accurate data for the neutron capture cross section are needed for the study on LLFPs transmutation systems. Nevertheless, only a few experiments to measure the neutron capture cross section of Pd-107 have been performed. The neutron energy regions of most of the measurements are limited. A new measurements with a wide neutron energy range from the thermal to keV energies is needed to improve the neutron capture cross section of $^{107}$Pd.

In the present work, the neutron capture cross section measurements were carried out using the Accurate Neutron Nucleus Reaction Measurement Instrument (ANNRI) at the Materials and Life Science Facility (MLF) of the Japan Proton Accelerator Research Complex (J-PARC). A high intensity pulsed neutron beam from Japan Spallation Neutron Source at the MLF using the 3 GeV proton beam was utilized. NaI(Tl) detectors of ANNRI were used for capture measurements. The time-of-flight (TOF) method was employed to determine the incident neutron energy. Two-dimensional data, TOF and pulse-height (PH), were acquired and the data were analyzed based on a PH weighting technique. Resonance parameters were derived from resonance analysis using the REFIT code.

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