Fluctuating Cu-O-Cu Bond Model for Cuprate Superconductivity
Keywords in the Physics Content Management System
Document Actions
| Event Type | High Energy Experimental Seminar |
|---|---|
| Date and Time | 28-Mar-2008 from 11:10 to 12:00 |
| Location | MP912 |
| Host | John Martin |
HALO - Helium and Lead Observatory for Supernova Neutrinos
Stan Yen
TRIUMF
Existing neutrino detectors are mostly
of the water Cerenkov and liquid scintillator types, which are
primarily sensitive to electron anti-neutrinos via charged-current
interactions on the hydrogen nuclei in these materials. By contrast,
the large neutron excess of a heavy nucleus like Pb acts to
Pauli-block p→n transitions induced by electron anti-neutrinos,
making it primarily sensitive to electron neutrinos. This channel is
expected to show the most interesting effects of flavour-swapping and
spectral splitting due to MSW-like collective neutrino-neutrino
interactions in the core of the supernova, the only place in the
universe where there is a sufficient density of neutrinos for this to
occur. The observation of a galactic core-collapse supernova by a
Pb-based neutrino detector, as a complement to other neutrino
detectors, would provide a wealth of data for both particle
physicists and astrophysicists. The data would provide a test for θ 13 ≠0 and an inverted neutrino mass hierarchy, and the ratio of 1-neutron to 2-neutron events would be a measure of the temperature of the cooling neutron star. HALO is a detector of opportunity proposed for SNOLAB, which will utilize 80 tons of surplus Pb blocks, together with the
neutral-current detectors from the SNO experiment and the SNO data
acquisition system, to provide a low-cost, low-maintenance,
long-lived, high-livetime detector. A supernova at 10 kpc would
result in 43 neutrons in the absence of collective ν-ν
interactions, and many more in their presence. A future upgrade to 1
kiloton would be sensitive to supernova anywhere in our galaxy.
| Contact Info | |
|---|---|
| Name | John Martin |
| martin@physics.utoronto.ca | |
| Phone | 8-2954 |
In Memoriam: Lev Kofman