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在我所回旋加速器上进行在束γ能谱学的研究工作,由于加速器的束流聚焦性能不够理想,造成严重的中子、γ本底,使工作存在一定的困难。经采取相应措施后,已初步达到在束γ能谱实验的要求,并测得了~(199)TI的在束γ能谱。 中子及γ本底的主要来源有三部分:1).限流光栏、准直器及法拉第筒;2).靶核的核反应产物;3).探测器周围物体如支架、墙壁等的散射。在这三种来源中,第2部分是不可避免的,但使用约1nA的束流强度时可使
In my cyclotron beam gamma spectroscopy research work, because the accelerator beam focusing performance is not ideal, causing serious neutron, γ background, so that there are some difficulties in the work. After taking the corresponding measures, the requirements of beam γ spectrometry experiment have been reached initially, and the in-beam γ energy spectrum of ~ (199) TI has been measured. The main sources of neutron and gamma background are three parts: 1) the current-limiting light bar, the collimator and the Faraday cup; 2) the nuclear reaction product of the target nucleus; and 3) the scattering of objects, such as brackets, walls, etc. around the detector. Of these three sources, Part 2 is unavoidable, but using a beam current of about 1 nA allows