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Presupernovae as powerful neutrino sources

Presupernovae as powerful neutrino sources. detectable by next neutrino experiments M. Kutschera, A. Odrzywołek, M. Misiaszek Ustroń 2009. Neutrino astrophysics group Institute of Physics, Jagellonian University, Kraków, Poland: A.Odrzywołek, M. Misiaszek, M.K.

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Presupernovae as powerful neutrino sources

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  1. Presupernovae as powerful neutrino sources detectable by next neutrino experiments M. Kutschera, A. Odrzywołek, M. Misiaszek Ustroń 2009

  2. Neutrino astrophysics group • Institute of Physics, Jagellonian University, Kraków, Poland: A.Odrzywołek, M. Misiaszek, M.K. References to our papers: arXiv Neutrino spectra available at

  3. Research summary: • Spectra of neutrinos from stars at late stages of thermonuclear burning (presupernovae) are found • This allows us to predict counting rates in various neutrino detectors • Presupernovae seem to be detectable by next generation of neutrino detectors

  4. Stars with initial mass (ZAMS) M>9Msol after red giant phase: • ignite carbon • develope iron core • end life as core-collapse supernovae • example: 15 Msol :

  5. Nearby candidate: - Betelgeuse in ORION constellation - distance 130 pc

  6. After carbon ignition neutrino-cooled stars • Photon luminosity much less L<<Lν than neutrino luminosity. -photon luminosity constant after carbon ignition -neutrino luminosity grows by many orders!

  7. Strong temperature growth in the core

  8. Can neutrino experiments detect presupernovae?

  9. Pair annihilation dominant Antineutrino flux from pair annihilation crucial ! Different than for the Sun (only neutrinos)

  10. High density – neutrino and antineutrino spectra differ

  11. Near the collapse: Total flux grows as Lν~Tc9 Mean neutrino energy grows

  12. Predictions for various detectors

  13. Range one day before collapse (various detectors)

  14. Presupernova neutrinos vs geoneutrinos

  15. Nuclear reactions produce more neutrinos νe than pair annihilation • More than 1000 nuclei must be included

  16. Weak nuclear reactions: neutrinosexcess

  17. Comparison with solar neutrinos

  18. REAL NEUTRINO ASTRONOMY STARTS

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