Identification of backgrounds in the EDELWEISS-I dark matter search experiment
S. Fiorucci, A. Benoit, L. Berge, J. Blumer, A. Broniatowski, B. Censier, A. Chantelauze, M. Chapellier, G. Chardin, S. Collin, X. Defay, M. De Jesus, H. Deschamps, P. Di Stefano, Y. Dolgorouky, L. Dumoulin, K. Eitel, M. Fesquet, J. Gascon, G. Gerbier, C. Goldbach, M. Gros, M. Horn, A. Juillard, R. Lemrani, A. De Lesquen, A. Lubashevskiy, M. Luca, S. Marnieros, L. Mosca, X. -F. Navick, G. Nollez, O. Olivieri, P. Pari, V. Sanglard, L. Schoeffel, F. Schwamm, M. Stern, E. Yakushev
Abstract
This paper presents our interpretation and understanding of the different backgrounds in the EDELWEISS-I data sets. We analyze in detail the several populations observed, which include gammas, alphas, neutrons, thermal sensor events and surface events, and try to combine all data sets to provide a coherent picture of the nature and localisation of the background sources. In light of this interpretation, we draw conclusions regarding the background suppression scheme for the EDELWEISS-II phase.
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