Speaker
Description
The electron linear accelerator at the Institute for Integrated Radiation and Nuclear Science, Kyoto University (KURNS-LINAC) is an L-band accelerator installed in 1965. In nuclear data measurements at KURNS-LIAC, pulsed neutron sources consisting of a water-cooled tantalum target as a photo-neutron source and light water moderators were used. The time resolutions of those pulsed neutron sources had been evaluated through numerical calculation [1] and experiment [2]. In recent years, an improved cylindrical moderator vessel called the 170 mm diameter moderator was implemented. The moderator vessel has been modified for improvement of the Ta target installation. Thus, time resolution of the 170 mm diameter moderator was evaluated by the PHITS3.31A [3] with the JENDL-5 [4] in this study. As the result, it was obtained that the time resolutions at a neutron flight path of 12.7 m are approximately 0.6 % for TOF times between 30 - 100 μsec. This work was supported by JSPS KAKENHI Grant Number JP25K15764.
References
[1] T. Sano, et. al., “Analysis of energy resolution in the KURRI-LINAC pulsed neutron facility”, EPJ web of conference, 146, 03031 (2017).
[2] Y. Matsuo, et. al., “Experimental Evaluation of Energy Resolutions for Pulsed Neutron Beam in the KURNS-LINAC”, EPJ web of conference, 284, 06003 (2023).
[3] T. Sato, et. al., “Features of Particle and Heavy Ion Transport code System (PHITS) version 3.02”, J. Nucl. Sci. Technol. 55(5-6), (2018), pp. 684-690.
[4] O. Iwamoto, et al., "Japanese evaluated nuclear data library version 5: JENDL-5", J. Nucl. Sci. Technol., 60(1), 1-60 (2023).
