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Supernova neutrino detection: present status and new ideas Marco Selvi Bologna University & INFN

Supernova neutrino detection: present status and new ideas Marco Selvi Bologna University & INFN. Detectors for stellar collapse n.

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Supernova neutrino detection: present status and new ideas Marco Selvi Bologna University & INFN

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  1. Supernova neutrino detection:present status and new ideasMarco SelviBologna University & INFN

  2. Detectors for stellar collapse n Others approved detector in costruction: Borexino (300 t of C9H12), Icarus (600 t of LAr) (AMANDA may observe a statistical enhance in the PM counting rate).

  3. in LVD Neutrino oscillations in SN We consider the system of 3 active neutrinos nf=(ne, nm, nt), mixed in vacuum such that nf=Unmwhere nm=(n1, n2, n3) is the vector of mass eigenstates and U is the mixing matrix. If neutrinos have mass they could oscillate between flavors. The oscillation is resonantly enhanced if a flavor-asymmetric medium is present (MSW matter effect). The medium density r res for the resonance tooccur depends on the oscillation parameters.The wide range of density values in the SN matter allows for 2 resonance levels. The resonance is expected for nor n depending on the mass hierarchy (=sign of Dm2atm)

  4. n-Fe “New” ideas in the market • Adding a small amount of Gd (100 t of GdCl3 in SK) in a water Čerenkov. ne + p  n + e+ allows the detection of both the interaction product: • clear ne detection through ne+ 16O  16F + e- interactions • SN relic neutrinos neutrino proton elastic scatteringnx + p  nx + pin low energy threshold detectors electron n detection in liquid argon ne+ 40Ar  40K + e- electron n detection in iron ne+ 56Fe  56Co + e- electron n detection in lead-scintillator calorimeter ADONIS

  5. SNEWS Main goals: • Improve the trigger sensitivity for a SN core collapse by correlating the signals of two or more detectors • Promptly alert the astronomy community

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