The Study of Intermediate Energy Photonuclear Physics with Polarized Beams and Targets

詹姆斯麦迪逊大学的光核物理小组正在布鲁克海文国家实验室（BNL）的国家同步加速器光源（NSLS）的激光电子伽马源（LEGS）和杜克大学（DU）的杜克自由电子激光实验室（DFELL）的高强度伽马源（HIGS）设施中进行康普顿散射和介子生产计划。这两个设施的工作都集中在偏振光子束和目标上。在LEGS，实验将使用专门为该计划建造的非极化HD目标。极化目标正在弗吉尼亚大学（UVA）、DU和JMU的HIGS设施中为该计划开发。其中包括几个极化目标，包括使用JMU制造的材料的可极化闪烁体目标。LEGS的工作重点是蒸馏用于目标生产的高纯度HD和参与数据收集的最后阶段。HIGS的工作重点是制造可极化散射器靶和建造探测器组装和测试实验室。该实验室将使用JMU的资金进行装备，并将允许HIGS的碘化钠探测器组装和测试。所有的学生都参加了纪念活动。这为他们提供了一个在JMU独一无二的机会。这是校园里唯一的低温实验室。此外，这座建筑在世界上是独一无二的，使JMU校园的这一设施成为LEGS计划的重要组成部分，也是我们学生理想的学习环境。HIGS碘化钠探测器测试实验室将作为核物理实验室课程开发的起点，以补充PI介绍的现有讲座，并将允许扩展一个新的部门外展计划，包括核物理。JMU的可极化靶材料的制备正在与这里的材料科学组产生密切的联系。这在不同研究小组的学生和教师之间建立了联系。

The photonuclear physics group at James Madison University is engaged in aprogram of Compton scattering and meson production located at the LaserElectron Gamma Source (LEGS) at the National Synchrotron Light Source (NSLS)at Brookhaven National Laboratory (BNL), and the High Intensity Gamma Source(HIGS) facility at the Duke Free Electron Laser Laboratory (DFELL)laboratory at Duke University (DU). The work at both facilities is focusedon polarized photon beams and targets. At LEGS, the experiments will use apolarized HD target especially constructed for this program. Polarizedtargets are being developed for the program at the HIGS facility at theUniversity of Virginia (UVA), DU and JMU. These include several polarizedtargets, including the polarizable scintillator target using materialfabricated at JMU.The LEGS effort focuses on the distillation of high purity HD for targetproduction and the participation in the final phase of data collection. TheHIGS effort is concentrated on the fabrication of polarizable scintillatortargets and the construction of a detector assembly and testing laboratory.This lab will be equiped using JMU money and will permit NaI detectorassembly and testing for HIGS. All the students are involved in distilleryoperation. This provides them with an opportunity that is unique at JMU.This is the only cryogenic laboratory of any kind on campus. In addition,this distillery is unique in the world making this facility on the JMUcampus a critical component for the LEGS program and an ideal learningsituation for our students. The HIGS NaI detector testing lab will serve asa starting point for the development of a nuclear physics lab course tocomplement the existing lecture introduced by the PI and will allowextension of a new department outreach program to include nuclear physics.The preparation of polarizable target materials at JMU is generating acloser connection with the material science group here. This buildsconnections among the students in different research groups and connectionsamong the faculty.