Shielding experiments of concrete and iron for the 244 MeV and 387 MeV quasi-mono energetic neutrons using an organic scintillator (at RCNP, Osaka Univ.)

¹ High Energy Accelerator Research Organization (KEK), 1-1Oho, Tsukuba, Ibaraki 305-0801, Japan
² Department of Accelerator Science, Graduate University for Advanced Studies (SOKENDAI), 1-1Oho, Tsukuba, Ibaraki 305-0801, Japan
³ Japan Atomic Energy Agency (JAEA), 2-4 Shirakata,Tokai, Naka, Ibaraki 319-1195, Japan
⁴ National Institute of Advanced Industrial Science and Technology (AIST), 1-1-1 Umezono, Tsukuba, Ibaraki 305-8568, Japan
⁵ Research Reactor Institute, Kyoto University, 2-1010 Asashiro-nishi, Kumatori, Sennan, Osaka 590-0494, Japan
⁶ Research Center for Nuclear Physics (RCNP), Osaka University, 10-1Mihogaoka, Ibaraki, Osaka 567-0047, Japan
⁷ Shimizu Corporation, Etchujima 3-4-17, Koto-ku, Tokyo 135-8530, Japan
⁸ Cyclotron and Radioisotope Center, Tohoku University, 6-3 Aramaki, Aoba, Sendai 980-8578, Japan

^a Corresponding author: masayuki.hagiwara@kek.jp

Published online: 25 September 2017

Abstract

A shielding benchmark experiment has been performed using a quasi-monoenergetic ⁷Li(p,n) neutron source with the peak energies of 244 and 387 MeV at the Research Center for Nuclear Physics (RCNP) of Osaka University, in order to assess the accuracy of nuclear data and calculation codes used in high-energy accelerator shielging design. Energy spectra behind bulk shields of 10- to 100-cm-thick iron, 25- to 300-cm-thick concrete and their composite are measured using a NE213 organic liquid scintillator with a diameter and thickness of 25.4 cm each with a time-of-flight and an unfolding method. The neutron attenuation lengths are illustared for iron and concrete as a function of the incident energy.