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3-D MEASUREMENT OF THE NSCL POSITION-SENSITIVE GAMMA RAY DETECTOR ARRAY



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Proceedings of the 7th International Workshop on Accelerator Alignment SPring 8 2002 3 D MEASUREMENT OF THE NSCL POSITION SENSITIVE GAMMA RAY DETECTOR ARRAY D P Sanderson and W F Mueller The National Superconducting Cyclotron Laboratory Michigan State University East Lansing MI USA 1 INTRODUCTION The National Superconducting Cyclotron Laboratory NSCL is a national nuclear physics research laboratory on the campus of Michigan State University In a typical experiment heavy ions with masses ranging from hydrogen to uranium are created in an Electron Cyclotron Resonance ECR ion source and injected into the K500 cyclotron The accelerated beam is transported to the K1200 cyclotron where its electrons are stripped to a higher charge state before additional acceleration After extraction the beam has an energy of up to 200 MeV per nucleon The extracted beam is focused onto a production target and the secondary beam from the fragmentation reaction is analyzed in a series of dipoles and quadrupoles multipoles A beam switchyard focuses the beam into one of nine experimental stations Superconducting magnets are found in the main coils of the two cyclotrons one of the ECR ion sources and in all of the high energy beam transport dipoles and quadrupoles multipoles The research programs at NSCL include nuclear astrophysics nuclear structure and the production of isotopes far from the valley of stability One of the newest pieces of experimental equipment is the Segmented Germanium Array SeGA 1 2 SeGA is an array of eighteen 32 fold segmented germanium detectors see Figs 1 2 These detectors are designed to measure gamma rays emitted from heavy ion beams with energies up to 140 MeV per nucleon At high beam velocities the detected energy of a gamma ray emitted from the beam nucleus will depend on the angle at which the gamma ray was detected For example a 1 MeV gamma ray emitted by a 32Mg beam with a velocity of 0 4c will have an apparent energy of 1 4 MeV when detected at 30 degrees



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