U.S.-Western Europe Cooperative Research on Single-Nucleon Wave Functions and Reaction Mechanisms for Single-Nucleon Knockouts

该奖项支持R. S. Hicks博士和马萨诸塞大学中能核物理组的其他成员与瑞典、荷兰和英国的物理学家合作，利用隆德大学加速器设备产生的连续光子束进行一项实验。目前在美国还没有类似的已知能量光子光束。主要的欧洲合作者是G. van der Steenhoven博士，他是一个主要来自国家核与高能物理研究所的荷兰小组的首席发言人，爱丁堡大学的D. Branford和D.G. Ireland，以及光子核反应小组的B. Schroeder。隆德大学。这个核物理实验的主要目的是提高对由于与入射电子或伽马射线的电磁相互作用而使核子从原子核中射出的机制的理解。具体来说，合作的科学家们将测量原子核吸收已知能量的光子所产生的质子抛射的动量矢量。这项研究将为运动学区域的单核子敲除反应机制提供新的见解，其中介子交换电流和短程相互作用是重要的。这样的理解是必需的，以便正确地解释某些反应，以获得关于原子核内单核子分布的全面和详细的信息。

This award supports Dr. R. S. Hicks and others of the Medium Energy Nuclear Physics Group of the University of Massachusetts to collaborate with physicists from Sweden, the Netherlands and the United Kingdom in an experiment to be carried out using the continuous photon beam produced by the University of Lund accelerator facility. Comparable beams of known-energy photons are currently not available in the United States. The main European collaborators are Dr. G. van der Steenhoven, principal spokesperson of a Dutch group primarily from the National Institute for Nuclear and High Energy Physics, D. Branford and D.G. Ireland of Edinburgh University, and B. Schroeder of the Photonuclear Reactions Group, University of Lund. The primary objective of this nuclear physics experiment is to improve the understanding of mechanisms by which nucleons are ejected from the nucleus as a result of an electromagnetic interaction with an incident electron or gamma ray. Specifically, the cooperating scientists will measure the momentum vectors of protons ejected from the nucleus as a result of the absorption by the nucleus of photons of known energy. This study should give fresh insights into reaction mechanisms for single-nucleon knockout in the kinematic region where meson exchange currents and short-range interactions are important. Such an understanding is required in order to correctly interpret certain reactions to obtain comprehensive and detailed information on the distributions of single nucleons inside nuclei.