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Unknowns of Neutrinos

Delve into unknowns of neutrinos such as mass hierarchy, CP phase, and more. Learn about JUNO-bb, reactor neutrino measurements, and uncover opportunities for future advancements in neutrino research. Explore new technologies, mass scaling, global collaborations, and the quest for understanding neutrino properties.

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Unknowns of Neutrinos

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  1. Unknowns of Neutrinos • Neutrino oscillation： • Neutrino mass hierarchy • Θ23 Octant • CP phase • Unitarity of neutrino mixing matrix • For exotics and sterile neutrinos • Neutrino mass • Dirac or Majorana ? • Sterile neutrinos ? • Magnetic moments ? • Relic neutrinos • Searches,…

  2. Unknowns of Neutrinos • Neutrino oscillation： • Neutrino mass hierarchy • Θ23 Octant • CP phase • Unitarity of neutrino mixing matrix • For exotics and sterile neutrinos • Neutrino mass • Dirac or Majorana ? • Sterile neutrinos ? • Magnetic moments ? • Relic neutrinos • Searches,…

  3. Unknowns of Neutrinos • Neutrino oscillation： • Neutrino mass hierarchy • Θ23 Octant • CP phase • Unitarity of neutrino mixing matrix • For exotics and sterile neutrinos • Neutrino mass • Dirac or Majorana ? • Sterile neutrinos ? • Magnetic moments ? • Relic neutrinos • Searches… JUNO can do some JUNO-bb JUNO-near

  4. JUNO-Near • A ~1 m3 Liquid Xe TPC placed at ~ 20m from a reactor core • Precision measurement of reactor neutrino energy spectrum with a resolution ~ 1%@1MeV • Neutrino magnetic moment • Background ? • R&D on going to have a conceptual design • Try to get funding, man power, technologies,… • Welcome collaborators

  5. JUNO-bb • JUNO is a great detector with an extremely good energy resolution. What can be done next ? • A KamLAND-Zen and SNO+ type of detector for bb decays ? • Can sensitivity improve with the increase of mass ? • Is the shallow depth of JUNO a problem ? • What is the ultimate sensitivity ? Zhao et al., arXiv:1610.07143, submitted to CPC

  6. A First Look • Take the KamLAND-Zen type of approach as an example: insert a balloon filled with 136Xe-loaded LS (other isotopes?) into JUNO • Cosmic-induced backgrounds are removed by cutting a volume around the muon track • Yes, sensitivity scales with the mass Muon tracking is important ! Zhao et al., arXiv: 1610.07143, accepted by CPC

  7. Future • New ideas • New technologies • Global coordination • Global collaboration: Huge detectors at scale of B $ ? • Neutrino mass • bb decays • Magnetic moments ?

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