GEANT4 simulation of the neutron background of the C$_6$D$_6$ set-up for capture studies at n_TOF
TOF collaboration, P. Žugec, N. Colonna, D. Bosnar, S. Altstadt, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Bécares, F. Bečvář, F. Belloni, E. Berthoumieux,… 展开作者
TOF collaboration, P. Žugec, N. Colonna, D. Bosnar, S. Altstadt, J. Andrzejewski, L. Audouin, M. Barbagallo, V. Bécares, F. Bečvář, F. Belloni, E. Berthoumieux, J. Billowes, V. Boccone, M. Brugger, M. Calviani, F. Calviño, D. Cano-Ott, C. Carrapiço, F. Cerutti, E. Chiaveri, M. Chin, G. Cortés, M. A. Cortés-Giraldo, M. Diakaki, C. Domingo-Pardo, R. Dressler, I. Duran, N. Dzysiuk, C. Eleftheriadis, A. Ferrari, K. Fraval, S. Ganesan, A. R. García, G. Giubrone, M. B. Gómez-Hornillos, I. F. Gonçalves, E. González-Romero, E. Griesmayer, C. Guerrero, F. Gunsing, P. Gurusamy, S. Heinitz, D. G. Jenkins, E. Jericha, Y. Kadi, F. Käppeler, D. Karadimos, N. Kivel, P. Koehler, M. Kokkoris, M. Krtička, J. Kroll, C. Langer, C. Lederer, H. Leeb, L. S. Leong, S. Lo Meo, R. Losito, A. Manousos, J. Marganiec, T. Martìnez, C. Massimi, P. F. Mastinu, M. Mastromarco, M. Meaze, E. Mendoza, A. Mengoni, P. M. Milazzo, F. Mingrone, M. Mirea, W. Mondalaers, C. Paradela, A. Pavlik, J. Perkowski, A. Plompen, J. Praena, J. M. Quesada, T. Rauscher, R. Reifarth, A. Riego, F. Roman, C. Rubbia, R. Sarmento, A. Saxena, P. Schillebeeckx, S. Schmidt, D. Schumann, G. Tagliente, J. L. Tain, D. Tarrío, L. Tassan-Got, A. Tsinganis, S. Valenta, G. Vannini, V. Variale, P. Vaz, A. Ventura, R. Versaci, M. J. Vermeulen, V. Vlachoudis, R. Vlastou, A. Wallner, T. Ware, M. Weigand, C. Weiß, T. Wright
发表信息：
P. Zugec, N. Colonna, D. Bosnar et al., Nucl. Instrum. Methods A 760, 57 (2014)
通过详细的GEANT 4模拟研究了n_TOF俘获测量用C $_6$ D $_6$探测器装置的中子灵敏度。在模拟中实现了整个n_TOF实验大厅的真实软件副本，包括中子束线、样品、探测器支撑和实验区域的墙壁。模拟已被分析的方式与实验数据相同，特别是通过应用脉冲高度加权技术。模拟已被验证对中子背景的测量与$^\mathrm{nat}$ C样品进行，显示出良好的协议以上1千电子伏。在较低的能量下，在测量的$^\mathrm{nat}$ C产率中发现了一个额外的成分，这阻止了在低于几百eV的中子能量下使用$^\mathrm{nat}$ C数据进行中子背景估计。从模拟中得到了中子本底的起源和时间结构。两个不同样品的中子背景的例子证明了中子背景的准确模拟在俘获截面测量中的重要作用。
英文摘要：
The neutron sensitivity of the C$_6$D$_6$ detector setup used at n_TOF for capture measurements has been studied by means of detailed GEANT4 simulations. A realistic software replica of the entire n_TOF experimental hall, including the neutron beam line, sample, detector supports and the walls of the experimental area has been implemented in the simulations. The simulations have been analyzed in the same manner as experimental data, in particular by applying the Pulse Height Weighting Technique. The simulations have been validated against a measurement of the neutron background performed with a $^\mathrm{nat}$C sample, showing an excellent agreement above 1 keV. At lower energies, an additional component in the measured $^\mathrm{nat}$C yield has been discovered, which prevents the use of $^\mathrm{nat}$C data for neutron background estimates at neutron energies below a few hundred eV. The origin and time structure of the neutron background have been derived from the simulations. Examples of the neutron background for two different samples are demonstrating the important role of accurate simulations of the neutron background in capture cross section measurements.
Monte-Carlo Simulations for the optimisation of a TOF-MIEZE Instrument
MIEZE（Modulation of Intensity with Zero Effort）技术是中子共振自旋回波（NRSE）技术的一种变体，已被证明是一种独特的中子散射技术，可在磁场中进行高能量分辨率测量。它在飞行路径差异方面的局限性已经被研究分析为中子束与消失发散。在目前的工作蒙特卡罗模拟准弹性MIEZE实验考虑到光束发散以及样品尺寸。MIEZE技术的一个应用可以是瑞典欧洲空间源的专用NRSE-MIEZE仪器。在此将详细讨论基于Montel镜光学器件并借助蒙特卡罗模拟的特定设计的优化。
Design development and implementation of an irradiation station at the neutron time-of-flight facility at CERN
一个新的寄生式、混合场、中子为主的辐照站最近已在欧洲粒子物理实验室（CERN）投入使用。该站安装在中子飞行时间设施中，利用中子散射靶产生的二次辐射。新的台站允许在更接近于粒子加速器运行期间所遇到的辐照条件下进行辐射损害研究;在台站进行的辐照试验将补充通常用伽马源进行的材料标准试验。样品将每年暴露于MGy范围内的中子剂量，对n TOF设施运行的影响最小。该工作站有24个辐照位置，每个位置可容纳多达100 cm 3的样品材料。鉴于其接近nTOF靶，在保护屏蔽内，考虑到人员的安全并避免对nTOF设施和实验的操作产生任何不必要的影响，已经仔细地开发了辐照站及其操作程序。由于nTOF靶周围的整个区域和辐照样品的残留放射性，即使当nTOF设施不运行时，也禁止人类操作员进入辐照站。机器人用于远程安装和取回样品，并根据辐射防护条例和最大限度地减少人员剂量的目的，对处理程序进行了其他优化。
High-Pressure Reinforced Vessel, produced by Additive Manufacturing, to be used as a gas target for the measurement program at n_TOF -- Multiple Argon Experiments (MArEX)
National Institute for Nuclear Physics (INFN), Gran Sasso National Laboratory (LNGS)（意大利国家核物理研究所（INFN），格兰萨索国家实验室（LNGS））；National Institute of Nuclear Physics (INFN), Legnaro National Laboratory (LNL)（意大利国家核物理研究所（INFN），莱尼亚罗国家实验室（LNL））
Recoil Proton Telescopes and Parallel Plate Avalanche Counters for the $^{235}$U(n,f) cross section measurement relative to H(n,n)H between 10 and 450 MeV neutron energy
