Quick facts

CUORE

Physics with CUORE [ref]

Background goal in 0νββ region of interest 0.01 counts/keV/kg/yr
Expected energy resolution 5 keV at 2615 keV
Expected sensitivity to 0νββ T1/2 = 9.5 × 1025 yr in 5 years (90% C.L.)

CUORE Detectors [ref]

Number of bolometers 988, arranged into 19 towers with 13 floors of 4 crystals each
Detector composition TeO2 crystals, with natural isotopic abundance of tellurium
Crystal dimensions 5 × 5 × 5 cm3
Detector mass 742 kg, with 206 kg of 130Te

CUORE Cryostat [ref]

Configuration Dilution refrigerator with pulse tube cryocoolers
Internal shielding Roman lead shield on sides and below detector, and modern low-radioactivity lead shield above detector
External shielding Modern low-radioactivity lead shield and borated polyethylene neutron shield

CUORE-0

Physics with CUORE-0 [ref]

0νββ half-life limit T1/2 > 2.7 × 1024 yr (90% C.L.)
0νββ half-life limit (with Cuoricino) T1/2 > 4.0 × 1024 yr (90% C.L.)
Effective Majorana neutrino mass limit (with Cuoricino) mββ < 270–760 meV (90% C.L.)
Energy resolution in 0νββ region of interest 5.1 ± 0.3 keV FWHM
Background level in 0νββ region of interest 0.058 ± 0.004 (stat.) ± 0.002 (syst.) counts/keV/kg/yr
Final isotopic (130Te) exposure 9.8 kg yr

CUORE-0 Detectors [ref]

Number of bolometers 52, arranged into 1 tower with 13 floors of 4 crystals each
Detector composition TeO2 crystals, with natural isotopic abundance of tellurium
Crystal dimensions 5 × 5 × 5 cm3
Instrumented detector mass 39.1 kg, with 10.9 kg of 130Te

CUORE-0 Cryostat [ref]

Configuration Dilution refrigerator
Internal shielding Roman lead shield cylindrical shield around detector and disks above and below the detector
External shielding Modern low-radioactivity lead shield, borated polyethylene neutron shield, and acrylic anti-radon box flushed with nitrogen gas

Cuoricino

Physics with Cuoricino [ref]

0νββ half-life limit T1/2 > 2.8 × 1024 yr (90% C.L.)
Effective Majorana neutrino mass limit mββ < 300–710 meV (90% C.L.)
Energy resolution in 0νββ region of interest 6.3 ± 2.5 keV FWHM for 5 × 5 × 5 cm3 crystals
Background level in 0νββ region of interest 0.169 ± 0.006 counts/keV/kg/yr
Final isotopic (130Te) exposure 19.75 kg yr

Cuoricino Detectors

Number of bolometers 62, arranged into 11 floors of four 5 × 5 × 5 cm3 crystals each and 2 floors of nine 3 × 3 × 6 cm3 crystals each.
Detector composition All the TeO2 crystals feature natural isotopic abundance of tellurium, with the exception of two 3 × 3 × 6 cm3 crystals enriched in 130Te (82%) and two 3 × 3 × 6 cm3 crystals enriched in 128Te (75%)

Bolometers

Detector working temperature T ≈ 10 mK
Crystal heat capacity C ≈ 2 × 10-9 J/K at 10 mK
Thermal coupling of crystal to heat bath G ≈ 2 × 10-9 W/K at 10 mK
Bolometer time constant τ = C/G ≈ 1 s at 10 mK
Thermistor resistance R ≈ 100 MΩ at 10 mK
Typical pulse rise time t ≈ 0.05 s
Typical pulse decay time t ≈ 0.2 s
Thermistor voltage signal ΔV ≈ 0.3 mV/MeV
Crystal temperature rise ΔTcrystal ≈ 0.1 mK/MeV

130Te

0νββ decay Q-value 2527.515 ± 0.013 keV [ref][ref][ref]
130Te isotopic abundance 34.167% [ref]
130Te atomic mass 129.9062244 ± 0.0000021 u [ref]
Expected 0νββ half-life for mββ =50 meV T1/2 = 1.0–5.6 × 1026 yr