# Radiation field characterization with emphasis on the collimator configuration at the compact neutron source RANS-II facility

Kenta Sugihara, Yujiro Ikeda, Tomohiro Kobayashi, Kunihiro Fujita, Shota Ikeda, Nobuhiro Shigyo, Yoshie Otake

## 抄録

The RIKEN Accelerator-driven compact Neutron Source-II (RANS-II) based on the 7Li(p,n)7Be reaction with 2.49 MeV proton injection was installed in a small area of the experimental hall, where the scattered radiation is expected to strongly influence experiments. Therefore, we have begun to study the radiation characteristics of the RANS-II hall by simulation with the Particle and Heavy Ion Transport code System (PHITS) and by experiments to clearly identify the scattered component. In addition, to suppress the background, a collimator is studied with respect to its size, shape, and materials. With the use of the (Formula presented.) 30 mm borated polyethylene collimator, we found that the background becomes less than 1 (Formula presented.) of the extracted neutron beam intensity 1.0 m from the Li target. For the experiment, neutron suppression was characterized by measuring the neutron dose rate with a neutron dosimeter and a collimator. The suppression ability of the neutron beam was confirmed by comparing the results of simulations with those of experiments.

本文言語 英語 journal of nuclear science and technology https://doi.org/10.1080/00223131.2022.2088632 印刷中 - 2022

## !!!All Science Journal Classification (ASJC) codes

• 核物理学および高エネルギー物理学
• 原子力エネルギーおよび原子力工学

## フィンガープリント

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