ABSTRACT

A measurement of high-energy neutron streaming was performed through a maze at the CERN (Conseil Européen pour la Recherche Nucléaire) High-energy AcceleRator Mixed-field (CHARM) facility. The protons of 24 GeV/c were injected onto a 50-cm-thick copper target and the released neutrons were streamed through a maze with several corridor-legs horizontally designed with the shield walls in the facility. Streaming neutrons were measured by using aluminum activation detectors placed at 10 locations in the maze. From the radionuclide production rate in the activation detectors, the attenuation profile along the maze was obtained for the reaction of ²⁷Al(n,α)²⁴Na. Monte Carlo simulations performed with two codes, the Particle and Heavy Ion Transport System (PHITS) and CERN FLUktuierende KAskade (FLUKA), gave good agreements with the measurements within a factor of 1.7 for the production rates ranging over more than 3 orders of magnitude.

摘要

在 CERN (Conseil Européen pour la Recherche Nucléaire) 高能加速器混合场 (CHARM) 设施中，通过迷宫对高能中子流进行了测量。将 24 GeV/c 的质子注入 50 厘米厚的铜靶上，释放的中子流过迷宫，迷宫中有多条走廊腿与设施中的屏蔽墙水平设计。通过使用放置在迷宫中 10 个位置的铝激活探测器来测量流动中子。从激活探测器中的放射性核素产生率，获得了²⁷ Al(n,α) ²⁴反应沿迷宫的衰减曲线呐。使用粒子和重离子传输系统 (PHITS) 和欧洲核子研究中心 FLUktuierende KAskade (FLUKA) 这两个代码执行的蒙特卡罗模拟，对于超过 3 个数量级的生产率，在 1.7 倍的因子内与测量结果非常吻合。