Particle - Identified Spectroscopy with Phoswich Detector in High-Energy Mixed Radiation Field

中子谱几乎没有在航天器或飞机上测量过，因为中子测量需要区分中子和带电粒子事件。基于这种观点，我们研制了一种新的磷硅氧探测器，它由NE 213液体闪烁体（直径133 mm）组成。X 133 mm长），周围为NE 115塑料闪烁体（10 mm厚）。在NE 115闪烁体中由带电粒子引起的光具有225 nsec的长特征衰减时间常数，而在NE 213闪烁体中由中子反冲质子引起的光具有30 nsec的时间常数。光衰减时间常数的这些差异使得有可能分离不同粒子种类的脉冲。利用70 MeV的质子轰击2 mm厚的Be靶，在近红外光谱仪上产生了中子和带电粒子的混合场 ...更多信息 （国立放射科学研究所）回旋加速器设施，并在NIRS的HIMAC（千叶的重离子医用加速器）上将100 MeV/n碳离子轰击在停止长度的碳或铝靶上。将探测器放置在目标下游3 5 m处，0 45度。到光束轴。用日本理化学研究所环形回旋加速器135 MeV质子轰击Be+C靶，测量了该探测器对中子的响应函数。测量的中子响应函数进行了比较与蒙特卡罗计算，SCINFUL代码。根据这些实验和计算的响应函数，完成了高达130 MeV的中子的响应矩阵。用FERDOU程序对实验能谱进行展开，得到了近红外回旋加速器中子-带电粒子混合场中的γ能谱和中子能谱。少

Neutron spectra have scarcely been measured on board a spacecraft or an aircraft, because the neutron measurement requires a discrimination between neutron and charged-particle events. In this viewpoint, we have developed a new phoswich detector consisting of an NE213 liquid scintillator (133mm diam. X 133mm long) surrounded by an NE115 plastic scintillator (10mm thickness). The light induced by charged particles in the NE115 scintillator has a long characteristic decay time constant of 225nsec, whereas the light by recoil protons from neutrons in the NE213 has the time constant of 30nsec. These differences in the light-decay time constant make it possible to separate pulses of the different particle species. This detector can measure the neutron spectrum up to about 130MeV by discriminating between neutron and charged-particle events in a mixed field in space.A mixed field of neutrons and charged particles were produced by bombarding 70MeV protons on a 2mm thick Be target at the NIRS … More (National Institute of Radiological Sciences) cyclotron facility and by bombarding 100MeV/n carbon ions on stopping length carbon or aluminium target at the HIMAC (Heavy Ion Medical Accelerator in Chiba) in the NIRS. The detector was placed at 3〜5m downstream from the target at 0〜45deg. To the beam axis. It was found that this phoswich detector was able to discriminate neutron and gamma-ray events from incident charged-particle events.The response functions of the phoswich detector to neutrons were measured with neutrons from the Be+C target bombarded by 135MeV protons from the RIKEN (Institute of Physical and Chemical Research) ring cyclotron. The measured response functions for neutrons were compared with Monte Carlo calculations, SCINFUL code. From these experimental and calculated response functions, the response matrices were completed for neutrons up to 130MeV. By unfolding the experimental spectra with the FERDOU code, the gamma-ray and neutron spectra in a mixed field of neutrons and charged particles at NIRS cyclotron were obtained. Less