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Measurement of the neutron-capture cross-section of $$^{133}$$Cs using ANNRI in the MLF at J-PARC

Hales, B. P.; Nakamura, Shoji ; Kimura, Atsushi  ; Iwamoto, Osamu 

As part of the ImPACT project, it is currently planned to measure the neutron cross-section of $$^{135}$$Cs (half-life $$2.3 times 10^6$$ y), a long-lived fission product (LLFP), via neutron time-of-flight (TOF) method using ANNRI in the Material and Life science Facility (MLF) at the Japan Proton Accelerator Research Complex (J-PARC). $$^{133}$$Cs (natural Cs, stable) exists as a contaminant in the $$^{135}$$Cs sample. To make an accurate measurement of $$^{135}$$Cs, accurate data of the $$^{133}$$Cs cross-section is required. We have measured the neutron cross-section in the thermal and epithermal energy regions. We will report on the measured cross-section data, resonances, and our methodology.

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