Solid State Studies Utilizing an Intense Low Energy PositronBeam

利用强低能正电子束进行固态研究

• 批准号: 8620168
• 负责人: Leonard Roellig
• 金额: --
• 依托单位: CUNY City College
• 依托单位国家: 美国
• 项目类别: Continuing grant
• 财政年份: 1987
• 资助国家: 美国
• 起止时间: 1987-05-15 至 1990-10-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8620168&HistoricalAwards=false
• 关键词: Solid; State; Studies; Utilizing; Intense

An intense monoenergetic, variable low energy beam of positrons has been constructed at the Brookhaven National Laboratory. This is more than 100 times greater than any existing beams from radioactive sources. They propose to increase further the low energy positron beam flux by two orders of magnitude, and to carry out two types of experiments with it. The first is to produce a beam of positronium atoms to determine the reflection coefficient of positronium as a function of its energy from solid surfaces to determine whether positronium diffraction would be a useful tool for analyzing the structure of solid surfaces. The second type of experiment consists of measuring the angular correlation of annihilation radiation resulting from positrons annihilating on the surface of solids, and thereby obtain the surface electrons momentum density distribution.

一种强的单能可变低能正电子束 它是在布鲁克海文国家实验室建造的。 这 比现有的任何梁都大100倍以上， 放射源。 他们建议进一步提高低 能量正电子束通量两个数量级， 用它做两种实验。第一种是 产生一束正电子素原子来确定 正电子偶素系数与其能量的函数关系 表面，以确定是否正电子素衍射将是一个 分析固体表面结构的有用工具。 的 第二类实验包括测量角度 正电子湮没辐射的关联 在固体表面上湮灭，从而获得 表面电子动量密度分布