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Report No.

Measurement of the neutron capture cross-section of $$^{133}$$Cs as a part of the ImPACT project

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 at the Japan Proton Accelerator Research Complex (J-PARC). Both $$^{133}$$Cs (natural Cs, stable) and $$^{137}$$Cs (half-life $$30.0$$ y) are unavoidable contaminants in the $$^{135}$$Cs sample. In working towards the measurement of $$^{135}$$Cs, a measurement of non-radioactive $$^{133}$$Cs has been conducted. The neutron capture cross-section of $$^{133}$$Cs in the thermal to epithermal energy region was experimentally measured via neutron TOF method at J-PARC. Measured results show good agreement with JENDL in the energy region below 10 eV.



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