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Influence of neutrons and γ-rays in the Fréjus underground laboratory on the NEMO experiment

To be sensitive to an effective Majorana neutrino mass, 〈 m ν〉, on the order of 0.1 eV, the NEMO 3 double beta (ββ(0ν)) decay experiment requires precise knowledge and control of the backgrounds. The effect of neutrons and γ-rays from the Fréjus underground laboratory (LSM, Laboratoire Souterrain de...

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Published in:Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Accelerators, spectrometers, detectors and associated equipment, 2001, Vol.457 (3), p.487-498
Main Authors: Marquet, Ch, Piquemal, F., Arnold, R., Augier, C., Baker, J., Barabash, A., Bing, O., Blum, D., Brudanin, V., Caffrey, J., Campagne, J.E., Caurier, E., Dassie, D., Egorov, V., Errahmane, K., Eschbach, R., Filipova, T., Guyonnet, J.L., Jollet, C., Jullian, S., Hubert, F., Hubert, Ph, Kisel, I., Kochetov, O., Kornoukhov, V.N., Kovalenko, V., Lalanne, D., Laplanche, F., Leccia, F., Linck, I., Longuemare, C., Mauger, F., Nicholson, H.W., Nikolic-Audit, I., Ohsumi, H., Pilugin, I., Reyss, J.L., Sarazin, X., Scheibling, F., Štekl, I., Suhonen, J., Sutton, C.S., Szklarz, G., Timkin, V., Tretyak, V., Umatov, V., Vála, L., Vanyushin, I., Vareille, A., Vorobel, V., Vylov, Ts
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Language:English
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Summary:To be sensitive to an effective Majorana neutrino mass, 〈 m ν〉, on the order of 0.1 eV, the NEMO 3 double beta (ββ(0ν)) decay experiment requires precise knowledge and control of the backgrounds. The effect of neutrons and γ-rays from the Fréjus underground laboratory (LSM, Laboratoire Souterrain de Modane) has been studied during 10 700 h of data collection. The data were taken with a NEMO 2 prototype detector using different shield configurations. Monte Carlo calculations with GEANT/MICAP code and a new library of γ-rays from neutron captures are presented. The implied consequences for the NEMO 3 detector which is under construction are discussed. The neutrinoless double beta decay background induced by neutrons and γ-rays within the LSM will be suppressed to the very suitable level of 0.1 event in a live time of five years given the appropriate shield and magnetic field.
ISSN:0168-9002
1872-9576
DOI:10.1016/S0168-9002(00)00789-0