The Search for Neutrinoless Double Beta Decay

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The Search for Neutrinoless Double Beta Decay. Tashi Parsons-Moss BNL NCSS 2006. β Decay and Weak Interaction. (A, Z)  (A, Z + 1) + β - +  e (1) (A, Z)  (A, Z - 1) + β + +  e (2) (A, Z) + e -  (A, Z - 1) +  e (3). Neutrinos.  e ,  µ ,   - PowerPoint PPT Presentation

Transcript of The Search for Neutrinoless Double Beta Decay

  • The Search for Neutrinoless Double Beta DecayTashi Parsons-MossBNL NCSS 2006

  • 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)

  • Neutrinose , , 1930 postulated by Pauli1956 detected by Cowen et al. Oscillations and Mass

  • 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)

  • Possible Mechanisms of 0 decay SUSY particlesLeptoquarks Right-Handed weak interaction Light of Heavy Majorana Neutrinos

  • 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

  • Whats the big deal? = ?Absolute mass scale for neutrinosLeptogenesisWeak ForceGrand Unified Theories

  • ChallengesDetermining the dominant mechanismUncertainties in nuclear matrix elementsLimited resources, expenseBackground, background, Background!!!2 peakCosmic radiationIntrinsic backgroundShielding and cryostat material

  • Recent 0 results

  • Recent claim of 0 detection

  • Heidelberg-Moscow71.7 Kg-y dataControversial ResultsIncreased interest in quasi-degenerate 76Ge experiments

  • 0 Proposals

  • 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

  • MajoranaAssumes 68Ge within Ge detectors was limiting background in IGEX210 86% enriched, segmented n-type Ge crystals in ultra-pure electroformed Cu cryostats

  • Majorana

  • 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

  • MOON

  • AcknowledgementsI would like to thank Richard Ferrieri and all of the TAs, professors, students and supporters of the BNL Nuclear and Radiochemistry Summer School