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Neutron-induced nuclear reactions and degradation in germanium detectors

Leleux, P. and Albernhe, F. and Borrel, V. and Cordier, B. and Coszach, R. and Crespin, S. and Denis, J.M. and Duhamel, P. and Frabel, P. and Galster, W. and Graulich, J.S. and Jean, P. and Kandel, B. and Meulders, P. and Tauzin, G. and Vanhorenbeeck, J. and Vedrenne, G. and von Ballmoos, P. (2003) Neutron-induced nuclear reactions and degradation in germanium detectors. Astronomy and Astrophysics, 411 (1). L85-L90. ISSN 0004-6361

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We have measured cross sections of neutron-induced nuclear reactions leading to the delayed production of -ray lines similar to the ones of astrophysical interest. Conclusions were drawn concerning the expected background in the 26Al 1809 keV line and the 7Be 478 keV line in SPI. The neutron-induced degradation of Ge detectors was studied vs. the neutron energy, the neutron fluence and the detector temperature. Performance recovery of the detectors was studied for different annealing temperatures. Optimum temperature and times for annealing were determined.