[2E09-11] Neutron capture reaction

[2E10] A high-precision measurement of the ¹³³Cs neutron-capture cross-section as part of the ImPACT project

*Brian Yamada Hales¹, Shoji Nakamura¹, Atsushi Kimura¹, Osamu Iwamoto¹ (1. JAEA)

Keywords:ImPACT, neutron capture cross-section, ANNRI, Cs-133, TOF

There is currently a plan to measure the neutron-capture cross-section of ¹³⁵Cs (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 ¹³⁵Cs, it is unavoidable that ¹³³Cs (stable) will be an impurity within the sample. In order to derive high-quality ¹³⁵Cs data, it is necessary to also measure ¹³³Cs. We have measured the neutron-capture cross-section of ¹³³Cs 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 ¹³³Cs. Additionally, we have confirmed the misassignment of various resonances from previous experiments.