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Nuclear Instruments and Methods in Physics Research Research: Accelerators, Spectrometers, Detectors and Associated Equipment 560 (2006) 395-404
Response of the GLAST LAT calorimeter to relativistic heavy ions
B. Lott1, F. Piron2, B. Blank1, G. Bogaert3, J. Bregeon1, G. Canchel1, A. Chekhtman, P. D'avezac3, D. Dumora1, J. Giovinazzo1, J.E. Grove, M. Hellström, A. Jacholkowska2, W.N. Johnson, E. Nuss2, T. Reposeur1, D.A. Smith1, K. Sümmerer
GLAST Collaboration(s)

The CsI calorimeter of the Gamma-Ray Large-Area Space Telescope (GLAST) will be calibrated in flight with cosmic-ray heavy ions. In order to determine the response of the calorimeter to relativistic heavy ions lighter than Fe, an experiment was carried out at the GSI heavy ion facility using the Fragment Separator (FRS). The measured response exhibits an unexpected feature for light ions, opposite to that observed at low incident energy: for a given deposited energy, the observed signal is greater for these ions than for protons (or more generally Z=1 minimum ionizing particles). Pulse shapes are found to be almost identical for carbon ions and Z=1 particles, with a significant slow scintillation component, which constitutes another departure from the low-energy behavior. Data on the energy resolution for the individual CsI crystals and on the loss of ions due to nuclear reactions in the calorimeter are also presented.
1 :  CENBG - Centre d'Etudes Nucléaires de Bordeaux Gradignan
2 :  LPTA - Laboratoire de Physique Théorique et Astroparticules
3 :  LLR - Laboratoire Leprince-Ringuet
Physique/Physique/Instrumentations et Détecteurs
Scintillation – Relativistic heavy ions – CsI – Calorimeter