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  1. Development and underground test of radiopure ZnMoO4 scintillating bolometers for the LUMINEU 0 nu 2 beta project

    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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  2. Status of LUMINEU program to search for neutrinoless double beta decay of 100Mo with cryogenic ZnMoO4 scintillating bolometers

    ISBN: 978-0-7354-1333-7 ; International audience ; The LUMINEU program aims at performing a pilot experiment on 0ν2β decay of 100 Mo using radiopure ZnMoO4 crystals enriched in 100 Mo operated as cryogenic scintillating bolometers. Large volume... mehr

     

    ISBN: 978-0-7354-1333-7 ; International audience ; The LUMINEU program aims at performing a pilot experiment on 0ν2β decay of 100 Mo using radiopure ZnMoO4 crystals enriched in 100 Mo operated as cryogenic scintillating bolometers. Large volume ZnMoO4 crystal scintillators (∼ 0.3 kg) were developed and tested showing high performance in terms of radiopurity, energy resolution and α/β particle discrimination capability. Zinc molybdate crystal scintillators enriched in 100 Mo were grown for the first time by the low-thermal-gradient Czochralski technique with a high crystal yield and an acceptable level of enriched molybdenum irrecoverable losses. A background level of ∼ 0.5 counts/(yr keV ton) in the region of interest can be reached in a large detector array thanks to the excellent detectors radiopurity and particle discrimination capability, suppression of randomly coinciding events by pulse-shape analysis, and anticoincidence cut. These results pave the way to future sensitive searches based on the LUMINEU technology, capable of approaching and exploring the inverted hierarchy region of the neutrino mass pattern.

     

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    Quelle: BASE Fachausschnitt Germanistik
    Sprache: Englisch
    Medientyp: Konferenzveröffentlichung
    Format: Online
    Übergeordneter Titel: AIP Conference Proceedings ; Matrix Elements for the Double-beta-decay EXperiments (MEDEX'15) ; https://hal.in2p3.fr/in2p3-01226305 ; Matrix Elements for the Double-beta-decay EXperiments (MEDEX'15), Jun 2015, Prague, Czech Republic. pp.020007, ⟨10.1063/1.4934896⟩
    Schlagworte: NUCLEI; OXYGEN COMPOUNDS; PARTICLE IDENTIFICATION; TRANSITION ELEMENT COMPOUNDS; TRANSITION ELEMENTS; STABLE ISOTOPES; SIGNAL CONDITIONERS; RESOLUTION; REFRACTORY METALS; REFRACTORY METAL COMPOUNDS; PULSE CIRCUITS; METALS; MEASURING INSTRUMENTS; ISOTOPES; INTERMEDIATE MASS NUCLEI; EVEN-EVEN NUCLEI; ELEMENTS; ELECTRONIC CIRCUITS; DECAY; BETA-MINUS DECAY; BETA DECAY; ZINC COMPOUNDS; TEMPERATURE GRADIENTS; PULSE SHAPERS; PHOSPHORS; PARTICLE DISCRIMINATION; NUCLEAR DECAY; MOLYBDENUM COMPOUNDS; ANTICOINCIDENCE; BOLOMETERS; CRYSTALS; DOUBLE BETA DECAY; ENERGY RESOLUTION; MOLYBDATES; MOLYBDENUM ISOTOPES; [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]; [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det]
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    info:eu-repo/semantics/OpenAccess