CaMoO/sub 4/ scintillation crystal for the search of /sup 100/Mo double beta decay

Belogurov, S.; Kornoukhov, V. N.; Annenkov, Alexander; Borisevich, A.; Fedorov, A.; Korzhik, M.; Ligoun, V.; Missevitch, O.; Kim, S.K.; Kim, S.C.; Kim, S.Y.; Kwak, Jungwon; Lee, H.S.; Lee, J.; Myung, S. S.; Lee, Mi Jung; Kim, Y.D.; Lee, J.Y.; Lee, J.I.; Kim, H.J.; Kwon, Y. J.; Hwang, Mun Kyung; Zhu, J.

doi:10.1109/tns.2005.852678

Cited by 64 publications

(26 citation statements)

References 11 publications

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“…24 The 2νββ decay distribution can be an issue only for bolometric experiments based on the materials which contain several ββ candidate nuclei with high Q ββ , e.g. calcium molybdate 56,71,72 or cadmium molybdate, 73 once the choice of the isotope of interest with the highest ββ transition energy is impossible for some reason. This is the case of CaMoO 4 due to the absence of a technology for the industrial enrichment in 48 Ca (i.a.…”

Section: Bulk Activity In the Absorbermentioning

confidence: 99%

Low background techniques in bolometers for double-beta decay search

Poda

Giuliani

2017

Int. J. Mod. Phys. A

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Bolometers are low temperature particle detectors with high energy resolution and detection efficiency. Some types of bolometric detectors are also able to perform an efficient particle identification. A wide variety of radiopure dielectric and diamagnetic materials makes the bolometric technique favorable for applications in astroparticle physics. In particular, thanks to their superior performance, bolometers play an important role in the world-wide efforts on searches for neutrinoless double-beta decay. Such experiments strongly require an extremely low level of the backgrounds that can easily mimic the process searched for. Here we overview recent progress in the development of low background techniques for bolometric double-beta decay searches.Comment: Review, a part of IJMPA Special Issue on Low Background Technique

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Section: Bulk Activity In the Absorbermentioning

confidence: 99%

Low background techniques in bolometers for double-beta decay search

Poda

Giuliani

2017

Int. J. Mod. Phys. A

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“…The Czochralski technique is a universal method commonly used in the production of high-quality tungstates and molybdates [10,11,13,14]. The melting temperature of CaMoO 4 (T=1445 °C) permits pulling the crystals in air atmosphere using a crucible made of platinum (T melt = 1769 °C) or in an oxygen-free atmosphere using an iridium crucible (T melt = 2454 °C).…”

Section: Crystal Growthmentioning

confidence: 99%

“…The as-grown crystal has strong blue coloration due to oxygen depletion and reduction of Mo 6+ ions. It has been shown that this coloration can be removed by extended annealing in an oxygen atmosphere [13,17]. This procedure was applied and finally a colourless 40 Ca 100 MoO 4 crystal was obtained (Fig.…”

Section: Crystal Growthmentioning

confidence: 99%

“…This motivated the development of calcium molybdate scintillators for the 0νDBD experiment that has been initiated by some of the authors a few years ago. The work demonstrated the feasibility of production of large CaMoO 4 crystals with good optical and scintillation characteristics as well as low intrinsic radioactivity [13,14]. The objective of achieving better sensitivity in the experimental search for rare processes calls for an increase of the total number of nuclei subject to such process.…”

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confidence: 99%

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Growth and characterization of isotopically enriched ⁴⁰Ca¹⁰⁰MoO₄ single crystals for rare event search experiments

Аленков

Бузанов

Khanbekov

et al. 2011

Cryst. Res. Technol.

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Calcium molybdate is considered as a very promising scintillator material for experimental studies of rare processes. This paper reports on the production and characterization of a 40 Ca 100MoO 4 scintillator. Using the Czochralski technique, a crystal of high optical quality with total mass 0.55 kg, 42 mm diameter (minimum) and 53 mm 1ength of the cylindrical section was produced from isotopically enriched raw materials, containing 96.1% of 100 Mo and 99.964% of 40 Ca. To satisfy the requirement of low intrinsic radioactivity the purity of the materials was monitored at different stages of the production process and it is shown that the concentration of 238 U and 232 Th in the final crystal does not exceed 0.05 ppb. The scintillation properties of 40 Ca 100 MoO 4 were measured over the 8 -300 K temperature range and it is found that the light yield of the 40 Ca 100MoO 4 crystal is very similar to that of the CaMoO 4 reference scintillator.

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“…Metal molybdates form a wide and important class of inorganic materials that have a high application potential in various fields such as scintillator detectors, phosphors and electro-optic applications (Zhang et al 2015; Bavykina et al 2009; Zhou et al 2011; Danevich et al 2014; Belogurov et al 2005; Mikhailik et al 2007; Korzhik et al 2008; Lei and Yan 2008; Shivakumara et al 2015). Divalent metal molybdates with relatively large cations such as Ca 2+ , Sr 2+ , Ba 2+ and Pb 2+ (ionic radius above 99 pm) exist in scheelite-type structure (tetragonal symmetry, space group I4 1 /a ; Z = 4) where molybdenum ions adopt tetrahedral coordination, while divalent metal ions represent an eight-coordinated position (Sczancoski et al 2008; Sczancoski et al 2009; Ghosh et al 2015).…”

Section: Introductionmentioning

confidence: 99%

Dielectric and magnetic characteristics of Ca1−xMnxMoO4 (0 ≤ x ≤ 0.15) nanomaterials

et al. 2018

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Scheelite-type Ca1−xMnxMoO4 (x = 0.0, 0.01, 0.05, 0.10 and 0.15) nanomaterials were successfully synthesized via a combustion route. Dielectric studies showed a weak n-type electrical conductivity characteristic for insulators and low relative permittivity (εr < 15) decreasing with increasing Mn2+ content. CaMoO4 and Mn2+-doped nanomaterials are chemically compatible with Al and Ag electrodes and promising for low-temperature co-fired ceramic applications. Magnetic studies showed, at room-temperature diamagnetism for pure CaMoO4, the balance between diamagnetism and paramagnetism for Ca1−xMnxMoO4 (x = 0.01) and paramagnetic behaviour when 0.05 ≤ x ≤ 0.15 as well as the short-range antiferromagnetic interactions growing in strength as Mn2+ content increases. The Landé factor fitting procedure showed a spin-only contribution to the magnetic moment. CaMoO4 matrix unexpectedly revealed the residual paramagnetism at low temperatures derived probably from the molybdenum ions having unpaired 4d electrons as well as a paramagnetic-diamagnetic transition at 70 K.

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CaMoO/sub 4/ scintillation crystal for the search of /sup 100/Mo double beta decay

Cited by 64 publications

References 11 publications

Low background techniques in bolometers for double-beta decay search

Low background techniques in bolometers for double-beta decay search

Growth and characterization of isotopically enriched ⁴⁰Ca¹⁰⁰MoO₄ single crystals for rare event search experiments

Dielectric and magnetic characteristics of Ca1−xMnxMoO4 (0 ≤ x ≤ 0.15) nanomaterials

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CaMoO/sub 4/ scintillation crystal for the search of /sup 100/Mo double beta decay

Cited by 64 publications

References 11 publications

Low background techniques in bolometers for double-beta decay search

Low background techniques in bolometers for double-beta decay search

Growth and characterization of isotopically enriched 40Ca100MoO4 single crystals for rare event search experiments

Dielectric and magnetic characteristics of Ca1−xMnxMoO4 (0 ≤ x ≤ 0.15) nanomaterials

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Growth and characterization of isotopically enriched ⁴⁰Ca¹⁰⁰MoO₄ single crystals for rare event search experiments