Attenuation curves of neutrons from 400 to 550 Mev/u for Ca, Kr, Sn, and U ions in concrete on a graphite target for the design of shielding for the RAON in-flight fragment facility in Korea

Autor: Eunjoong Lee, Junhyeok Kim, Giyoon Kim, Jinhwan Kim, Kyeongjin Park, Gyuseong Cho
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Nuclear Engineering and Technology, Vol 51, Iss 1, Pp 275-283 (2019)
Druh dokumentu: article
ISSN: 1738-5733
DOI: 10.1016/j.net.2018.09.005
Popis: Rare isotope beam facilities require shielding data in early stage of their design. There is much less shielding data on neutrons from the reactions between heavy ion beams and matter than the data on neutrons produced by protons. The purpose of the present work is to produce and thus increase the amount of shielding data on neutrons generated by high-energy heavy ion beams based on the RAON in-flight fragment facility. Calculations were performed with the computational Monte Carlo codes PHITS and MCNPX. The secondary neutron source terms were evaluated at 550 MeV/u for Ca, Kr, and Sn and at 400 MeV/u for U ions on a graphite target. Source terms and attenuation lengths were obtained by fitting the ambient dose equivalent inside an ordinary concrete shield. Keywords: Heavy ion accelerator, Shielding data, Neutron attenuation, Monte Carlo
Databáze: Directory of Open Access Journals