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

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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.