利用低能D-D核反应出射质子和氚产额比研究重核屏蔽势.docVIP

  利用低能 D-D 核反应出射质子和氚产额比 研究重核屏蔽势# 周钰珊，方开洪，王铁山** 5 10 15 20 25 30 35 40 （兰州大学核科学与技术学院，兰州 730000） 摘要：本文利用低能区 D-D 核反应出射产物质子和氚的产额比研究重核屏蔽势。入射的 D+ 在载体材料中与材料原子发生相互作用（如多次散射等），损失能量的同时，离子飞行方向 与探测器探测方向的夹角发生变化，该变化导致实验室系下特定探测角内 D-D 核反应出射 的质子和氚的产额比(Yp/Yt)发生改变，利用这一性质结合模拟计算可反推 D+与重核间的屏 蔽势。本实验在日本东北大学 LNS 低能强流加速器装置上开展，由 D+轰击不同材料形成自 吸收靶，并测量自吸收靶内 10-20 keV D-D 核反应的 Yp/Yt。通过蒙特卡罗方法模拟氘在材 料中的多次散射过程，同时改变作用势模型(Kinetics, Bohr potential, Universal potential)，计 算不同屏蔽函数下的 Yp/Yt。结果表明：1) 利用 Bohr potential 模拟的 Yp/Yt 好于 Universal potential 和简单动力学的结果，但仍然与实验值有一定的差距；2)模拟中增强屏蔽效应能更 好地符合实验结果。 关键词：低能核反应；产额比；重核；屏蔽势 中图分类号：O562.5 Analysis of inter-atomic potential in heavy atom by the yield ratio of protons to tritons emitted from low energy D-D reaction Zhouyushan, Fangkaihong, Wangtieshan (The School of Nuclear Science and Technology,Lanzhou University,Lanzhou 730000) Abstract: The yield ratio of protons to tritons (P/T ratio) emitted from low energy D-D reaction has been used to analyses the screening effect for Coulomb barrier of heavy atom. Self-absorbing target has been produced by bombarding target with D+ beam. The P/T ratio at a given detection direction is affected by angles between the fly direction of deuterons and the detection direction. The angles are determined by the interaction, multi-scattering for example, between deuterons and target atoms. Therefore the inter-atomic potential among deuterons and target atoms could be deduced from the variation of P/T ratio. The experiment was performed with a low-energy and high-current ion beam generator at Tohoko University. A Monte Carlo computer program had been used to simulate the transport process with different kinds of potential models, Kinetics, Bohr potential, and Universal potential for instance. It is found that: 1) The simulative yield ratio could not agree well with the experimental result. 2）In the simulation the increasing of the screening effect can let the simulative data matches the experimental results better. Key words: knuclear