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Claudia Nones

Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse - Orsay. Status of Cuoricino and CUORE with some remarks on nuclear matrix elements. Claudia Nones. Physics of Massive Neutrinos - Blaubeuren, July 1 - 5, 2007. Outline of the talk.

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Claudia Nones

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  1. Centre de Spectrométrie Nucléaire etde Spectrométrie de Masse - Orsay Status of Cuoricino and CUORE with some remarks on nuclear matrix elements Claudia Nones Physics of Massive Neutrinos - Blaubeuren, July 1 - 5, 2007

  2. Outline of the talk • Brief remarks on the bolometric technique and the choice of 130Te as source of the 0vDBD • Cuoricino experiment: the detector and the updated results • CUORE project • Cuoricino vs HM ; 130Te vs other isotopes: comparisons through different N.M.E. calculations seen by the eyes of an experimentalist • Conclusions

  3. Bolometric technique: temperature sensor heat sink absorber crystal thermal coupling depositedenergy • this means large phase space for the decay • the Q-value is important with respect to the natural • radioactive background Brief remarks From a very simple thermal model Signal:∆T = E/C -> to develop high pulses the detector has to work at low temperature (10mk) • Main advantages: • high energy resolution • wide flexibility (few constraints on absorber material) • the detector is fully sensitive (no dead layer) • (also a drawback) WHY 130Te ? • high natural isotopic abundance (33.87 %) • high transition energy (Q=2530.30 ± 1.99 keV) • encouraging theoretical calculations for 0vDBD lifetime

  4. CUORE (hall A) Cuoricino (hall A) R&D final tests for CUORE (hall C) Cuoricino and CUORE Location Cuoricino experiment is installed in Underground National Laboratory of Gran Sasso L'Aquila – ITALY the mountain providing a 3500 m.w.e. shield against cosmic rays

  5. It is a self-consistent experiment giving significant results on Double Beta Decay. The Cuoricino detector Total number of detectors: 62 total active mass • TeO2 : 40.7 kg • 130Te : 11.3 kg • 128Te : 10.5 kg

  6. The Cuoricino detector

  7. 60Co pile up 130Te 0vBB Counts Energy (keV) Neutrinoless DBD results (1) Background sum spectrum of all the detectors in the DBD region MT = 11.83 kg 130Te  y

  8. Neutrinoless DBD results (2) UPDATED RESULTS: MT = 11.83 kg 130Te  y mee< 0.2 – 0.98 eV T1/20v (y) > 3  1024 y FWHM measured on sum bkg spectrum @ 2.6 MeV ~7 keV Bkg = 0.18±0.02 c/keV/kg/y Are we now able to scrutinize the HM claim of evidence? … we will see in the last part of the talk!!!

  9. CUORE Cryogenic Underground Observatory for Rare Events

  10. CUORE status Funded by the US For the moment, we are not late with respect to the master plan Data taking foreseen in 2011

  11. The world of the Nuclear Matrix Elements through the eyes of an experimentalist “PER ME SI VA NE LA CITTA’ DOLENTE,      PER ME SI VA NE L’ETERNO DOLORE,      PER ME SI VA TRA LA PERDUTA GENTE.  GIUSTIZIA MOSSE IL MIO ALTO FATTORE:      FECEMI LA DIVINA POTESTATE,      LA SOMMA SAPIENZA E ‘L PRIMO AMORE.  DINANZI A ME NON FUR COSE CREATE      SE NON ETERNE, E IO ETERNA DURO. LASCIATE OGNI SPERANZA, VOI CH’ENTRATE.” (Inferno, Canto III, vv. 1-9) Thanks to A. Poves, V. Rodin and J. Suhonen for their help…in this hell!!! « THROUGH ME THE WAY TO THE CITY OF WOE,THROUGH ME THE WAY INTO ETERNAL PAIN, THROUGH ME THE WAY AMONG THE LOST.JUSTICE MOVED MY MAKER ON HIGH.DIVINE POWER MADE ME, WISDOM SUPREME, AND PRIMAL LOVE.BEFORE ME NOTHING WAS BUT THINGS ETERNAL,AND I ENDURE ETERNALLY. ABANDON ALL HOPE, YOU WHO ENTER HERE. »

  12. QRPA or not QRPA?…this is the question!!! J. Suhonen – O. Civitarese and the Jyväskylä group QRPA A. Faessler and the Tuebingen group E. Caurier, F. Nowacki, A. Poves, et al. Shell Model Prof. Faessler’s advice: « Do not take democratic averaged matrix elements » … but so what can we do with our value of T0v1/2? • to evaluate mv • to scrutinize the HM result • to compare next generation experiments

  13. Cuoricino prospects Are we able now to scrutinize the HM claim of evidence? HM experimental results: T1/20v (y) = (0.69-4.18)  1025 (3σ range) Best value: 1.19x1025 y REF. Klapdor et al., Physics Letters B 586 (2004) 198-212 Nuclear matrix element of Muto-Bender-Klapdor mee= 0.24 – 0.58 eV (3σ range) What I have done… T1/20v (Klapdor) Choose a nuclear model T1/20v (130Te) References • Tuebingen’s group: erratum of nucl-th/0503063 • Suhonen’s group: nucl-th/0208005 • Shell Model: Poves’ talk @ 4th ILIAS Annual Meeting - Chambery

  14. Final sensitivity 6x1024 y Cuoricino limit vs Klapdor’s claim of evidence 3x1024 y Nuclear models Tuebingen group Shell model group Jyväskylä group T1/2 x 1024 y for 130Te N.B.: No univoque definition of G0v and M0v!!!

  15. And what about CUORE? (1) The main goal of CUORE is to test the inverted hierarchy

  16. And what about CUORE? (2) a: isotopic abundance A: atomic mass ε: efficiency M: active mass [kg] T: live time [y] b: background [c/keV/kg/y] Γ: energy resolution [keV] CUORE_conservative b=0.01 – Γ=5 – T=5y CUORE_aggressive b=0.001 – Γ=5 – T=5y F0v = 2.1 x 1026 y (1σ) F0v = 6.6 x 1026 y (1σ)

  17. CUORE and the inverted hierarchy CUORE_conservative CUORE_aggressive Nuclear models Tuebingen group Shell Model group Jyväskylä group T1/2 x 1026 y for 130Te

  18. Summarizing Cuoricino CUORE_conservative CUORE_aggressive Tuebingen group Shell Model group Jyväskylä group T1/2 x 1024 y for 130Te

  19. What about 130Te compared with other isotopes? • I fix the range of the mass -> inverted hierarchy (19-50 meV) • I use the 3 main “schools of thoughts” in terms of N.M.E. • I compare the capability to explore the inverted hierarchy region • Tuebingen’s group: erratum of nucl-th/0503063 • Suhonen’s group: nucl-th/0208005 • Shell Model: Poves’ talk @ 4th ILIAS Annual Meeting - Chambery References

  20. 150Nd 100Mo 82Se 136Xe 76Ge 116Cd 130Te T1/2 x 1026 y RQRPA (erratum) – Tuebingen group G0v calculates with gA=1.25 and r0=1.1fm

  21. 100Mo 82Se 136Xe 76Ge 116Cd 130Te T1/2 x 1026 y QRPA – Suhonen’s group G0v calculates with gA=1.25 and r0=1.2fm

  22. 82Se 136Xe 76Ge 116Cd 130Te T1/2 x 1026 y Shell Model group G0v calculates with gA=1.25 and r0=1.2fm

  23. Conclusions • Cuoricino is presently the most sensitive 0νDBD running experiment, capable to confirm the KK-HM “evidence”. • Cuoricino demonstrates the feasibility of a large scale bolometric detector (CUORE) with good energy resolution and bkg on many detectors. • CUORE, a second generation detector, will be built and start up in the next 4 years. • Recent results on background suppression confirm the capability to attack the inverted hierarchy mass region.

  24. Unit:y Suhonen + SM Rodin There is a difference of about 25%

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