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Report No.
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A High-precision measurement of the $$^{133}$$Cs neutron-capture cross-section as part of the ImPACT project

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

There is currently a plan to measure the neutron-capture cross-section of $$^{135}$$Cs (half-life 2.3 million years), using the neutron beam at the Materials and Life science Facility (MLF) at J-PARC. In the course of measuring $$^{135}$$Cs, it is unavoidable that $$^{133}$$Cs (stable) will be an impurity within the sample. In order to derive high-quality $$^{135}$$Cs data, it is necessary to also measure $$^{133}$$Cs. We have measured the neutron-capture cross-section of $$^{133}$$Cs using ANNRI at the MLF at J-PARC, in the energy region from thermal to 1.5 keV, via the time-of-flight method. This measurement has better statistics and covers a wider energy range than previous measurements of $$^{133}$$Cs. Additionally, we have confirmed the misassignment of various resonances from previous experiments.

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