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利用俄罗斯杜布纳联合核子研究所的高能加速器进行加速器驱动次临界系统 (ADS)靶区中子学研究。用 0 .5 33、1 .0、3.7和 7 4GeV质子轰击U(Pb)、Pb和Hg靶的测量结果表明 :U(Pb)和Pb与Hg靶的中子产额比分别为 ( 2 0 1± 0 1 0 )和 ( 1 76± 0 33) ,从获得较强中子的角度看 ,Hg作为ADS靶是不利的 ;沿厚 2 0cm靶的中子产额随入射质子穿透深度增大而下降 ,质子能量越低 ,中子产额下降越快 ,为在较大厚度范围内获得较均匀的中子场 ,质子能量不应低于 1GeV ;不同能量质子产生的次级中子能谱相近 ,但随质子能量提高 ,较高能量中子的比例逐渐增大。
The neutron research of Accelerator Driven Subcritical System (ADS) target zone was carried out by using the high energy accelerator of Dubbona Nuclear Research Institute in Russia. The results of proton bombardment U (Pb), Pb and Hg targets with 0 .5 33,1 .0, 3.7 and 7 4 GeV protons showed that the neutron yield ratios of U (Pb), Pb and Hg targets were 1 ± 0 1 0) and (1 76 ± 0 33), Hg was disadvantageous for the ADS target from the point of obtaining stronger neutrons. The neutron yield along a 20 cm thick target increased with the incident proton penetration depth Large and declining, the proton energy is lower, the neutron yield drops faster, in order to obtain a more uniform neutron field in a wide range of thickness, proton energy should not be less than 1GeV; different energy proton secondary neutron energy The spectra are similar, but as the proton energy increases, the proportion of higher energy neutrons gradually increases.