Integral experiment of 129I(n, γ) reaction using fast neutron source in the 'YAYOI' reactor. Issue 7 (3rd July 2022)

• Record Type: Journal Article
• Authors: Nakamura, Shoji; Toh, Yosuke; Kimura, Atsushi; Hatsukawa, Yuichi; Harada, Hideo
• Is Part Of: Journal of nuclear science and technology. Volume 59:Issue 7(2022)
• Page Start: 851
• Page End: 865
• Publication Date: 2022-07-03
• Subjects: Iodine-129 -- iodine-130 -- activation -- integral experiment -- JENDL-4.0 -- fast neutron source reactor -- YAYOI; Nuclear engineering -- Periodicals; Nuclear physics -- Periodicals; Nuclear energy -- Periodicals; 621.4805
• DOI: 10.1080/00223131.2021.2011794
• Languages: English
• ISSNs: 0022-3131

Abstract

ABSTRACT: The present study analyzes an integral experiment performed in the fast-neutron reactor 'YAYOI' of the University of Tokyo to validate the 129 I (n, γ) cross-section. An iodine-129 sample and 15 neutron flux monitors were irradiated with fast neutrons in the Glory hole of the reactor. Capture reaction rates of 129 I were obtained by measurement of gamma rays emitted through the decay of 130 I, and the 15 neutron flux monitors helped validate the computed fast-neutron flux spectrum in the Glory hole. By comparing the experimental and calculated reaction rates for 129 I, the present study reveals that the 129 I (n, γ) cross-section of JENDL-4.0 should be reduced by 18% in the 10 keV–3 MeV energy range and supports the data by Noguere et al. below 100 keV. Graphical abstract: uf0001