Performance of the neutron time-of-flight facility n_TOF at CERN
Performance of the neutron time-of-flight facility n_TOF at CERN
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DOI：
10.1140/epja/i2013-13027-6
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发表时间：
2013-02-01
影响因子：
2.7
通讯作者：
Zugec, P.
中科院分区：
文献类型：
--
作者：
Guerrero, C.;Tsinganis, A.;Zugec, P.
中子飞行时间设施n_TOF的特点是由20 GeV/c质子撞击铅靶产生的白色中子源。该设施主要用于测量中子诱导反应截面，在2001年至2004年期间在CERN运行，然后在2008年进行了重大升级。本文详细介绍了在现有的两种准直系统和两种中子慢化剂选择下，新中子束流的所有特性。讨论的特性包括中子通量的强度和能量依赖性、束流的空间分布、束内背景成分和能量分辨率/展宽。这些功能的讨论是基于专门的测量和蒙特卡罗模拟，并包括上述数量的系统不确定性的估计。
The neutron time-of-flight facility n_TOF features a white neutron source produced by spallation through 20 GeV/c protons impinging on a lead target. The facility, aiming primarily at the measurement of neutron-induced reaction cross sections, was operating at CERN between 2001 and 2004, and then underwent a major upgrade in 2008. This paper presents in detail all the characteristics of the new neutron beam in the currently available configurations, which correspond to two different collimation systems and two choices of neutron moderator. The characteristics discussed include the intensity and energy dependence of the neutron flux, the spatial profile of the beam, the in-beam background components and the energy resolution/broadening. The discussion of these features is based on dedicated measurements and Monte Carlo simulations, and includes estimations of the systematic uncertainties of the mentioned quantities.