Presentazione di PowerPoint

Presentazione di PowerPoint

CUORE (Cryogenic Underground Osservatory for Rare Events) and CUORICINO E.Fiorini, Neutrino 2004 Paris , June 17, 2004 For searches on neutrinoless decay WIMPs and axions interactions and on rare nuclear events The collaboration Laurence Berkeley National Laboratory University of California, Berkeley CA 94720 USA Dipartimento di Fisica e Matematica dell Universita dell Insubria e Sezione di Milano dell INFN, Como I-22100, Italy Dipartimento di Fisica dell Universita di Firenze e Sezione di Firenze dell INFN, Firenze ,I50125,Italy

Laboratori Nazionali del Gran Sasso,I-67010,Italy Laboratori Nazionali di Legnaro, Via Romea 4, I-35020 Legnaro (Padova) Kamerling Onnes Laboratory, Leiden University,2300 RAQ Leiden, Netherland Dipartimento di Fisica dell Universita di Milano-Bicocca e Sezione di Milano dell INFN, Milano I-20126 Italy Dipartimento di Ingegneria Strutturale del Politecnico di Milano, Milano I-20133, Italy Dipartimento di Fisica dell Universita di Genova e Sezione di Genova dell INFN, Genova, I-16146, Italy Department of Physics and Astronomy, University of South Carolina, Columbia, S.C. 29208, USA Lab. of Nucl. and High Energy Phys, University of Zaragoza, 50009, Zaragoza,Spain Dipartimento di Fisica dell Universita di Roma e Sezione di Roma1 dell INFN, Roma ,I-16146, Italy (A,Z) => (A,Z+2) + 2 e- + 2 e (A,Z) => (A,Z+2) + 2 e- + ( 2,3 (A,Z) => (A,Z+2) + 2 eu d W

d W u e- d W W e e

e- u d ee e e- u 0 - decay

2 - decay Neutrinoless peak 2 sum electron energy / Q Present Cuoricino region Possible evidence (best value 0.39 eV) quasi degeneracy m1 m2 m3 Inverse hierarchy m212= m2atm

Direct hierarchy m212= m2sol Cosmological disfavoured region (WMAP) Feruglio F. , Strumia A. , Vissani F. hep-ph/0201291 Experimental approach Thermal detectors heat bath Source = detector (calorimetric) e- Thermal sensor

absorber crystal e- Incident particle Why thermal detectors Flexibility in the choice of detectors uncertainty in nuclear matrix evaluation apeak could be simulated by a radioactive signal. If found in two different regions => Clear indication Excellent resolution <1 eV ~ 4 eV ~10 eV ~keV

Present choice of @ 6 keV @ 2 MeV Te due to 130 Importante per lespansione a basso costo dei rivelatori futuri Good natural isotopic abundance (i.a. = 33.87 %) High transition energy (Q = (2528.8 1.3) keV ) Spazio delle fasi grande, minor fondo radioattivo ( valle tra len. piena ed il Compton edge del

mee 208 Tl 0.1) eV T 1/2 1026 y observed with geo-chimical techniques ( T1/2 incl = ( 0.7 - 2.7 ) 1021 y) CUORE @ LNGS CUORE R&D (Hall C) CUORE (Hall A) Cuoricino (Hall A) Increase of the detector mass

10000,00 Mass [kg] 1000,00 100,00 Cuoricino 10,00 1,00 Mibeta 4 detectors array 340 g 0,10

73 g 0,01 1985 1990 1995 2000 Year 2005 2010

2015 Resolution of the 5x5x5 cm3 (~ 760 g ) crystals : @ 46 keV @ 0.351 MeV @ 0.911 MeV @ 2.615 MeV @ 5.407 MeV 210 Po line Counts

0.8 keV FWHM 1.4 keV FWHM 2.1 keV FWHM 2.6 keV FWHM 3.2 keV FWHM (the best spectrometer ever realized) Energy [keV] CUORICINO Search for the 2|o in 130Te (Q=2529 keV) and other rare events At Hall A in the Laboratori Nazionali del Gran Sasso (LNGS) 18 crystals 3x3x6 cm3 + 44 crystals 5x5x5 cm3 = 40.7 kg of TeO2

Operation started in the beginning of 2003 => ~ 4 months Background .19.02 c /kev/ kg/ a T 1/2 0 (130Te) > 7.5 x 1023 y .3 -1. 6 Klapdor 0.1 0.9 2 modules, 9 detector each, crystal dimension 3x3x6 cm3 crystal mass 330 g 9 x 2 x 0.33 = 5.94 kg of TeO 2 11 modules, 4 detector each, crystal dimension 5x5x5 cm3 crystal mass 790 g 4 x 11 x 0.79 = 34.76 kg of TeO2

IL PROGETTO CUORE CUORE is an array of 988 bolometers grouped in 19 colums with 13 flours of 4 crystals 750 kg TeO2 => 600 kg Te => 203 kg 130Te Crystals are separated by a few mm, only, with little material among them Progetto di set-up per CUORE External shiled Roman Pb (< 4 mBq/kg)

Modern Pb (~16 Bq/kg) Common Modern Pb (~160 Bq/kg) External shield in B-PET Anti-Rn box with flux of N2 Suspension system of CUORE The detector is suspended in an INDEPENDENTfrom the cryostat A mobile platform allows opening the cryostat disassemnling the shielding CUORE sensitivity b = 0.01 - = 5 keV F0 = 9.4 1025 ( T[y ] )1/2 | < m > |(0.024- 0.13 eV in 5 y)

F0 = 3 1026 ( T[y ] )1/2 | < m > |(0.016- 0.09 eV in 5 y) b = 0.001 - = 5 keV CUORE Background in the neutrinoless region Monte Carlo results , supported by CUORICINO Bulk crystal (<.1 pg/g) and external activity negligible a. cryostat activity(thermal shield larger in in CUORICINO then MIDBD) Increased Roman lead and no thermal shileds < .0038 counts/keV/kg/year . & surface activity from Copper structure (Monte Carlo => ~ 0.1 ng/g v.s. < 1 pg/g internal) proved!

c. & surface activity of crystals (Monte Carlo ~ 0.1 ng/g v.s. < .1 pg/g internal) Larger crystals (6x6x6 cm3 => 1.3 kg) Reasonably good , but fragile Active reduction of surface activity The scintillating bolometer Proved for CaF2 being studied for TeO2 Cu tape

TeO2 Ge-1 Ge-2 800 400 Conclusions - Thermal detectors are very flexible, and allow to study different nuclei

Compound Isotopic abundance Transition energy CaF2 .0187 % 4272 keV Ge 7.44 " 2038.7 "

MoPbO4 9.63 " 3034 " CdWO4 7.49 " 2804 " 34

" 2528 " 5.64 " 3368 " 48 76 100

116 130 150 NdF3 TeO2 150 NdGaO3 -130Te has high transition energy and 34% isotopic abundance => enrichment needed and/or very cheap. Any future extensions are possible -Performance of CUORE, amply tested with CUORICINO - CUORE has been approved and has already an underground location

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