51. Measurement of the thermal neutron capture-cross section of 191Ir at ANNRI MLF J-PARC.
- Author
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Ahmed Patwary, Md Kawchar, Segawa, Mariko, Maeda, Makoto, Toh, Yosuke, Endo, Shunsuke, Nakamura, Shoji, Rovira, Gerard, and Kimura, Atsushi
- Subjects
NEUTRONS ,TIME-of-flight spectroscopy ,CROSS-sectional method ,DATA libraries ,EVALUATION - Abstract
Thermal neutron capture cross-section for
191 Ir, ${{\rm{\sigma }}_{{\rm{Ir}}}}$ σ Ir (Eth ), is a prominent parameter in producing192 Ir radionuclide used in high-dose-rate brachytherapy. However, considerable discrepancies exist in past measurements using the activation method and a derived cross-section data calculation from positive resonance parameters of191 Ir, which were measured using the neutron time-of-flight (TOF) method. Therefore, for the first time, we aimed to measure the ${{\rm{\sigma }}_{{\rm{Ir}}}}$ σ Ir (Eth ) accurately using the neutron TOF method. Experiments were performed using a pulsed neutron beam and a NaI(Tl) detector at the Accurate Neutron–Nucleus Reaction Measurement Instrument of the Materials and Life Science Experimental Facility in the J-PARC. The ${{\rm{\sigma }}_{{\rm{Ir}}}}$ σ Ir (Eth ) was derived from the capture yield using the pulse height weighting technique. As a result, this study obtained the ${{\rm{\sigma }}_{{\rm{Ir}}}}$ σ Ir (Eth ) as 949 ± 80 b. The result agrees with some activation data and the evaluated nuclear data libraries, JENDL-5 and ENDF/B-VIII.0, within its uncertainty of 8.4%. This study provides a data reference for the ${{\rm{\sigma }}_{{\rm{Ir}}}}$ σ Ir (Eth ) measurement using the neutron TOF method. [ABSTRACT FROM AUTHOR]- Published
- 2024
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