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Astronomy and Astrophysics 411 (2003) L107-L112
SPI instrumental background characteristics
P. Jean1, G. Vedrenne1, J.P. Roques1, V. Schonfelder, B.J. Teegarden, A. von Kienlin, J. Knodlseder1, C. Wunderer, G.K. Skinner1, G. Weidenspointner1, D. Attie2, S. Boggs, P. Caraveo, B. Cordier2, R. Diehl, M. Gros2, P. Leleux, G.G. Lichti, E. Kalemci, J. Kiener3, V. Lonjou1, P. Mandrou1, P. Paul1, S. Schanne2, P. von Ballmoos1

In its space environment the INTEGRAL observatory is subject to an intense irradiation by energetic cosmic-ray particles that leads, via nuclear interactions with the telescope and spacecraft materials, to an important background of false events. In this paper we present the characteristics of the instrumental background that is observed in the spectrometer SPI (SPectrometer of INTEGRAL). We explain the tuning that has been performed on the parameters of the anticoincidence system in order to optimise the telescope sensitivity over the full energy range. Temporal variations of the instrumental background are discussed and methods are proposed that allow for their modelling in first order.
1 :  CESR - Centre d'étude spatiale des rayonnements
2 :  DAPNIA - Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée
3 :  CSNSM - Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse
Physique/Astrophysique/Cosmologie et astrophysique extra-galactique

Planète et Univers/Astrophysique
gamma-ray: instruments
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