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  1. Development and underground test of radiopure ZnMoO4 scintillating bolometers for the LUMINEU 0 nu 2 beta project
    Autor*in: Armengaud, E. ; Arnaud, Q. ; Augier, C. ; Benoit, A. ; Berge, L. ; Boiko R., S. ; Bergmann, T. ; Blueme,, J. ; Broniatowski, A. ; Brudanin, V. ; Camus, P. ; Cazes, A. ; Chapellier, M. ; Charlieux, F. ; Chernyak D., M. ; Coron, N. ; Coulter, P. ; Danevich F., A. ; de Boissiere, T. ; Decourt, R. ; de Jesus, M. ; Devoyon, L. ; Drillien, A. ; Dumoulin, L. ; Eitel, K. ; Enss, C. ; Filosofov, D. ; Fleischmann, A. ; Foerster, N. ; Fourches, N. ; Gascon, J. ; Gastaldo, L. ; Gerbier, G. ; Giuliani, A. ; Gray, D. ; Gros, M. ; Hehn, L. ; Henry, S. ; Herve, S. ; Heuermann, G. ; Humbert, V. ; Ivanov I., M. ; Juillard, A. ; Kefelian, C. ; Kleifges, M. ; Kluck, H. ; Kobychev V., V. ; Koskas, F. ; Kozlov, V. ; Kraus, H. ; Kudryavtsev,v., A. ; Le Sueur, Hélène ; Loidl, M. ; Magnie,, P. ; Makarov E., P. ; Mancuso, M. ; de Marcillac, P. ; Marnieros, S. ; Marrache-Kikuchi, C. ; Menshikov, A. ; Nasonov S., G. ; Navick X., -F. ; Nones, C. ; Olivieri, E. ; Pari, P. ; Paul, B. ; Penichot, Y. ; Pessina, G. ; Piro, M.C. ; Plantevin, O. ; Poda D., V. ; Redon, T. ; Robinson, M. ; Rodrigues, M. ; Rozov, S. ; Sanglard, V. ; Schmidt, B. ; Scorza, S. ; Shlegel V., N. ; Siebenborn, B. ; Strazzer, O. ; Tcherniakhovski, D. ; Tenconi, M. ; Torres, Lionel ; Tretyak V., I. ; Vagneron, L. ; Vasiliev Ya, V. ; Velázquez, Matias ; Viraphong, Oudomsack ; Walker R., J. ; Weber, M. ; Yakushev, E. ; Zhang, X. ; Zhdankov V., N.
    Erschienen: 2015
    Verlag:  HAL CCSD ; IOP Publishing

    International audience ; The LUMINEU (Luminescent Underground Molybdenum Investigation for NEUtrino mass and nature) project envisages a high-sensitivity search for neutrinoless double beta (0 nu 2 beta) decay of Mo-100 with the help of scintillating... mehr

     

    International audience ; The LUMINEU (Luminescent Underground Molybdenum Investigation for NEUtrino mass and nature) project envisages a high-sensitivity search for neutrinoless double beta (0 nu 2 beta) decay of Mo-100 with the help of scintillating bolometers based on zinc molybdate (ZnMoO4) crystals. One of the crucial points for the successful performance of this experiment is the development of a protocol for producing high quality large mass ZnMoO4 crystal scintillators with extremely high internal radiopurity. Here we report a significant progress in the development of large volume ZnMoO4 crystalline boules (with mass up to 1 kg) from deeply purified materials. We present and discuss the results achieved with two ZnMoO4 samples (with mass of about 0.3 kg each): one is a precursor of the LUMINEU project, while the other one was produced in the framework of LUMINEU with an improved purification / crystallization procedure. The two crystals were measured deep underground as scintillating bolometers in the EDELWEISS dilution refrigerator at the Laboratoire Souterrain de Modane (France) protected by a rock overburden corresponding to 4800 m w.e. The results indicate that both tested crystals are highly radiopure. However, the advanced LUMINEU sample shows a clear improvement with respect to the precursor, exhibiting only a trace internal contamination related with Po-210 at the level of 1 mBq/kg, while the activity of Ra-226 and Th-228 is below 0.005 mBq/kg. This demonstrates that the LUMINEU purification and crystal-growth procedures are very efficient and leads to radiopurity levels which exceedingly satisfy not only the LUMINEU goals but also the requirements of a next-generation 0 nu 2 beta experiment.

     
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