The Search for Neutrinoless Double Beta Decay
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The Search for Neutrinoless Double Beta DecayTashi Parsons-MossBNL NCSS 2006
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Decay and Weak Interaction(A, Z) (A, Z + 1) + - + e(1)(A, Z) (A, Z - 1) + + + e (2)(A, Z) + e- (A, Z - 1) + e(3)
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Neutrinose , , 1930 postulated by Pauli1956 detected by Cowen et al. Oscillations and Mass
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Double Beta Decay(A, Z) (A, Z + 2) + 2e- + 2(48Ca, 76Ge, 82Se, 96Zr, 100Mo, 116Cd, 128Te, 130Te, 150Nd, 238U) (A, Z) (A, Z + 2) + 2e- (A, Z) (A, Z + 2) + 2e- + 0(+0)
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Possible Mechanisms of 0 decay SUSY particlesLeptoquarks Right-Handed weak interaction Light of Heavy Majorana Neutrinos
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0 Decay and Neutrino Mass3 Ranges of Mass sensitivity:Quasi-Degenerate ~100-500 meVAtmospheric neutrino oscillation results ~20-55 meVSolar neutrino oscillation results ~2-5 meV
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Whats the big deal? = ?Absolute mass scale for neutrinosLeptogenesisWeak ForceGrand Unified Theories
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ChallengesDetermining the dominant mechanismUncertainties in nuclear matrix elementsLimited resources, expenseBackground, background, Background!!!2 peakCosmic radiationIntrinsic backgroundShielding and cryostat material
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Recent 0 results
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Recent claim of 0 detection
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Heidelberg-Moscow71.7 Kg-y dataControversial ResultsIncreased interest in quasi-degenerate 76Ge experiments
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0 Proposals
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GENIUS (Germanium Nitrogen Underground Setup)Assumes limiting background on HM from external sourcesArray of 2.5 Kg p-type 86% enriched Ge crystals naked in LN2
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MajoranaAssumes 68Ge within Ge detectors was limiting background in IGEX210 86% enriched, segmented n-type Ge crystals in ultra-pure electroformed Cu cryostats
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Majorana
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MOON (Mo Observatory of Neutrinos)Uses unique nuclear structure of 100Mo to combine 0 search and solar neutrino experimentModules of plastic fiber scintillators with thin layers Mo
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MOON
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AcknowledgementsI would like to thank Richard Ferrieri and all of the TAs, professors, students and supporters of the BNL Nuclear and Radiochemistry Summer School