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Big World of Small Neutrinos

Big World of Small Neutrinos. Roman Shcherbakov 21, March, 2007. 3 Nobel prizes. 1988 LEDERMAN, SCHWARTZ and JACK STEIN BERG ER – detected muon neutrinos 1995 REINES – detected reactor neutrinos in 1956 2002 RAYMOND and KOSHIBA – detected solar neutrinos. NS. Neutrino optics.

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Big World of Small Neutrinos

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  1. Big World of Small Neutrinos Roman Shcherbakov 21, March, 2007

  2. 3 Nobel prizes • 1988 LEDERMAN,SCHWARTZ and JACKSTEINBERGER – detected muon neutrinos • 1995 REINES – detected reactor neutrinos in 1956 • 2002 RAYMOND andKOSHIBA – detected solar neutrinos

  3. NS Neutrino optics in the Neutron Star in the Sun in the Earth

  4. Neutrino oscillations

  5. Mixing matrix =>different neutrino & antineutrino For E=10MeV L12~300km L13~10km Neutrino oscillations Hierarchy is not yet known Only 1/3 of born electron neutrino stay electron neutrino

  6. Solar neutrinos > 50 trillion solar neutrinos pass through the human body every second but it would take approximately one light year of lead to block half of them 400kEv 10MEv

  7. In the nucleus Atom recoil

  8. 8 B-decay energy spectrum

  9. MSW effect Oscillations enforced by scattering • Not important for the Sun • Considered in detailed calculations of supernova explosions

  10. Supernova 1987a 51kpc away 24 neutrinos

  11. Supernova explosion (type II)

  12. Theoretical neutrino spectrum

  13. Total neutrinobackground luminosity

  14. Cosmic neutrino background (CNB) Similar to CMB Undetectable by any means Bad dark matter candidate – relativistic in the time of recombination Cold dark matter is favorable for structure formation

  15. Cuspy halos are not cuspy 2 solutions • Large annihilation cross-section of • cold dark matter (KKT model) • Warm dark matter

  16. Cold dark matter annihilation Doesn’t work Only decay to sterile particles Is possible

  17. ☻ ☺ ☺ ☻ Conclusions Neutrinos provide a new great tool for: • probing the interior of the Sun • observing the early stages of supernovae • proving particle theories

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