一套液闪快中子探测系统

介绍了一种在强γ辐射场中探测快中子的探测系统，利用实验室n－γ放射源，调试了系统n－γ甄别性能，确定了其最佳工艺状态。运用Monte-Carlo数值模拟，从理论上计算了模拟探测器的探测效率，并与实验测量结果进行了对比分析。     

放射性核束首次物理实验的探测器系统

描述了放射性核束进行首次物理实验所使用的探测器系统的构成及各类探测器的性能,同时给出了该系统用于物理实验所得到的人令人满意的在线获取结果。     

Experimental Study of Two-Neutron Correlation in ~8He~+

A neutron detector array was used in a breakup reaction experiment at RIKEN with an 82.5 MeV/u 8He beam impinging on the CH2 and C targets. The array was calibrated using the cosmic ray, the γ ray from the 6 He+Pb reaction and the mono-energetic neutrons from the 7Li(p, n)7Be(g.s.+0.43 MeV) reaction. The position resolution, timing resolution and neutron detection efficiency were obtained accordingly. Cross-talk rejection conditions were developed based on analysis of the data taken from the 7Li(p, n) 7Be(g.s.+0.43 MeV) test experiment, and finally a preliminary two-neutron correlation function for the 8 He breakup reaction was investigated.     

Recoiled Proton Tagged Knockout Reaction for ~8He

An experiment for knockout reaction induced by 8He beam at 82.5 MeV/nucleon on CH2 and C targets was carried out. The 6He and 4He core fragments at forward angles and the recoiled protons at large angles were detected coincidently. From this exclusive measurement the valence nucleon knockout mechanism and the core knockout mechanism are separated, which can be applied to the exclusive spectroscopic study on the structure of exotic nuclei.     

有轻元素存在的薄靶中重元素表面质量的测定

本文建议的方法能够测定靶中重元素(Z≥28)成分的表面质量。即使有其他元素成分存在,但只要它们足够地轻(Z≤17)则仍然可用。该方法利用放射性核素~(212)Po(~(220)Rn的活性沉积物~(212)Pb的子体)的a粒子在靶上发生的弹性散射。装置的刻度是借助于一个已知厚度的任何重元素标准靶来完成的。表面质量的测量精度可达±12%左右。     

Study of Isotopic Distribution of the Projectile-like Fragments Produced in the 17,18N + 197Au Reactions at 33 MeV/u

The experimental data of the isotopic distribution for projectile-like fragments are presented for the 17,18N + 197Au reaction at 33MeV/u. The width of the isotopic distributions for 18N projectile is significantly broader than that for 17N projectile, and the average N/Z ratio of the former shifts to higher neutron number side. As long as the realistic nucleon density distribution is used, the isotopic distribution for fragments is reproduced by the simple abrasion-ablation model calculation, which thus provides an independent way to determine the surface distribution of the nuclear matter density for neutron-rich nuclei.     

一个屏栅电离室计数器望远镜

本文描述一个以屏栅电离室作△E探测器,以Au-Si面垒探测器测定核粒子剩余能量E_R的△E-E计数器望远镜,如图1所示。作为阴极而处于地电位的壳体是由黄铜加工而成的。入射窗架固定在前盖板上,它同时又充当入射粒子的准直孔(φ4 mm×40 mm)。     

在25 AMeV 6 He+9 Be双中子转移反应中位置灵敏望远镜探测器的应用

叙述了25 AMeV^6He ^9Be双中子转移反应微分截面测量的实验设计思想。对某些角度望远镜探测器的构造进行了改进，并与其它探测器一起用于出射粒子鉴别。实验的初步分析结果表明：基于双中子转移反应设计的探测器布局和构造达到了实验的设计要求。     

大面积位置灵敏中低能中子谱仪的时间刻度系统的研究

在利用飞行时间法测量中子位置和能量的大面积位置灵敏中子谱仪的研制过程中,提出了利用“绝对时间差”刻度的方法来测量各个电子学的相对时间,系统研究了对光电倍增管时间分辨影响的因素,其中包括光源的种类、光源的发光时间等,并得到使光电倍增管的时间分辨达到最佳60ps的实验条件。     

放射性核束17N轰击9Be和197Au靶的中子发射

用飞行时间技术测得33.4MeV/u