This paper reports on the development of a technology involving
-enriched scintillating bolometers, compatible with the goals of CUPID, a proposed next-generation bolometric experiment to search for ...neutrinoless double-beta decay. Large mass (
), high optical quality, radiopure
-containing zinc and lithium molybdate crystals have been produced and used to develop high performance single detector modules based on 0.2-0.4 kg scintillating bolometers. In particular, the energy resolution of the lithium molybdate detectors near the
-value of the double-beta transition of
(3034 keV) is 4-6 keV FWHM. The rejection of the
-induced dominant background above 2.6 MeV is better than
. Less than
activity of
and
in the crystals is ensured by boule recrystallization. The potential of
-enriched scintillating bolometers to perform high sensitivity double-beta decay searches has been demonstrated with only
exposure: the two neutrino double-beta decay half-life of
has been measured with the up-to-date highest accuracy as
= 6.90 ± 0.15(stat.) ± 0.37(syst.)
. Both crystallization and detector technologies favor lithium molybdate, which has been selected for the ongoing construction of the CUPID-0/Mo demonstrator, containing several kg of
.
This paper reports on the development of a technology involving
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\begin{document}$$^{100}\hbox {Mo}$$\end{document}
100
Mo
-enriched scintillating bolometers, compatible with the goals of CUPID, a proposed next-generation bolometric experiment to search for neutrinoless double-beta decay. Large mass (
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\begin{document}$$\sim 1~\hbox {kg}$$\end{document}
∼
1
kg
), high optical quality, radiopure
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\begin{document}$$^{100}\hbox {Mo}$$\end{document}
100
Mo
-containing zinc and lithium molybdate crystals have been produced and used to develop high performance single detector modules based on 0.2–0.4 kg scintillating bolometers. In particular, the energy resolution of the lithium molybdate detectors near the
Q
-value of the double-beta transition of
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\begin{document}$$^{100}\hbox {Mo}$$\end{document}
100
Mo
(3034 keV) is 4–6 keV FWHM. The rejection of the
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\begin{document}$$\alpha $$\end{document}
α
-induced dominant background above 2.6 MeV is better than
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\begin{document}$$8\sigma $$\end{document}
8
σ
. Less than
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\begin{document}$$10~\upmu \hbox {Bq/kg}$$\end{document}
10
μ
Bq/kg
activity of
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\begin{document}$$^{232}\hbox {Th}\, (^{228}\hbox {Th})$$\end{document}
232
Th
(
228
Th
)
and
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\begin{document}$$^{226}\hbox {Ra}$$\end{document}
226
Ra
in the crystals is ensured by boule recrystallization. The potential of
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\begin{document}$$^{100}\hbox {Mo}$$\end{document}
100
Mo
-enriched scintillating bolometers to perform high sensitivity double-beta decay searches has been demonstrated with only
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\begin{document}$$10~\hbox {kg}\times \hbox {d}$$\end{document}
10
kg
×
d
exposure: the two neutrino double-beta decay half-life of
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100
Mo
has been measured with the up-to-date highest accuracy as
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\begin{document}$$T_{1/2}$$\end{document}
T
1
/
2
= 6.90 ± 0.15(stat.) ± 0.37(syst.)
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\begin{document}$$\times ~10^{18}~\hbox {years}$$\end{document}
×
10
18
years
. Both crystallization and detector technologies favor lithium molybdate, which has been selected for the ongoing construction of the CUPID-0/Mo demonstrator, containing several kg of
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100
Mo
.
This paper reports on the development of a technology involving
100
Mo
-enriched scintillating bolometers, compatible with the goals of CUPID, a proposed next-generation bolometric experiment to ...search for neutrinoless double-beta decay. Large mass (
∼
1
kg
), high optical quality, radiopure
100
Mo
-containing zinc and lithium molybdate crystals have been produced and used to develop high performance single detector modules based on 0.2–0.4 kg scintillating bolometers. In particular, the energy resolution of the lithium molybdate detectors near the
Q
-value of the double-beta transition of
100
Mo
(3034 keV) is 4–6 keV FWHM. The rejection of the
α
-induced dominant background above 2.6 MeV is better than
8
σ
. Less than
10
μ
Bq/kg
activity of
232
Th
(
228
Th
)
and
226
Ra
in the crystals is ensured by boule recrystallization. The potential of
100
Mo
-enriched scintillating bolometers to perform high sensitivity double-beta decay searches has been demonstrated with only
10
kg
×
d
exposure: the two neutrino double-beta decay half-life of
100
Mo
has been measured with the up-to-date highest accuracy as
T
1
/
2
= 6.90 ± 0.15(stat.) ± 0.37(syst.)
×
10
18
years
. Both crystallization and detector technologies favor lithium molybdate, which has been selected for the ongoing construction of the CUPID-0/Mo demonstrator, containing several kg of
100
Mo
.
The LUMINEU is designed to investigate the possibility to search for neutrinoless double beta decay in 100 Mo by means of a large array of scintillating bolometers based on ZnMoO4 crystals enriched ...in 100 Mo. High energy resolution and relatively fast detectors, which are able to measure both the light and the heat generated upon the interaction of a particle in a crystal, are very promising for the recognition and rejection of background events. We present the LUMINEU concepts and the experimental results achieved aboveground and underground with large-mass natural and enriched crystals. The measured energy resolution, the α/β discrimination power and the radioactive internal contamination are all within the specifications for the projected final LUMINEU sensitivity. Simulations and preliminary results confirm that the LUMINEU technology can reach zero background in the region of interest (around 3 MeV) with exposures of the order of hundreds kgxyears, setting the bases for a next generation 0v2β decay experiment capable to explore the inverted hierarchy region of the neutrino mass pattern.
The CUPID-Mo experiment at the Laboratoire Souterrain de Modane (France) is a demonstrator for CUPID, the next-generation ton-scale bolometric 0νββ experiment. It consists of a 4.2 kg array of 20 ...enriched Li_{2}^{100}MoO_{4} scintillating bolometers to search for the lepton-number-violating process of 0νββ decay in ^{100}Mo. With more than one year of operation (^{100}Mo exposure of 1.17 kg×yr for physics data), no event in the region of interest and, hence, no evidence for 0νββ is observed. We report a new limit on the half-life of 0νββ decay in ^{100}Mo of T_{1/2}>1.5×10^{24} yr at 90% C.I. The limit corresponds to an effective Majorana neutrino mass ⟨m_{ββ}⟩<(0.31-0.54) eV, dependent on the nuclear matrix element in the light Majorana neutrino exchange interpretation.
We report on a search for low-energy (E < 20 keV) WIMP-induced nuclear recoils using data collected in 2009 - 2010 by EDELWEISS from four germanium detectors equipped with thermal sensors and an ...electrode design (ID) which allows to efficiently reject several sources of background. Using an exposure of 113 kg.d, we find no evidence for an exponential distribution of low-energy nuclear recoils that could be attributed to WIMP elastic scattering. For WIMPs of mass 10 GeV, the observation of one event in the WIMP search region results in a 90% CL limit of 1.0 \times 10^-5 pb on the spin-independent WIMP-nucleon scattering cross-section, which constrains the parameter space associated with the findings reported by the CoGeNT, DAMA and CRESST experiments.
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