2017 Annual Meeting

Presentation information

Oral presentation

II. Radiation, Accelerator and Beam Technologies » 201-1 Nuclear Physics, Nuclear Data Measurement/Evaluation/Validation, Nuclear Reaction Technology

[2E09-11] Neutron capture reaction

Tue. Mar 28, 2017 2:45 PM - 3:35 PM Room E (16-205 Building No.16)

Chair: Toshiyuki Shizuma (QST)

3:00 PM - 3:15 PM

[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.