The Solution to the Solar n Problem. Jordan A. Goodman University of Maryland January 2003 Solar Neutrinos MSW Oscillations Super-K Results SNO Results Kamland Results Overall Results. Our current view of underlying structure of matter. P is uud N is udd p + is ud k + is us
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Jordan A. Goodman
University of Maryland
January 2003
}Baryons
(nucleons)
}Mesons
The Standard Model
Neutrinos are only weakly interacting
40 billion neutrinos continuously hit every cm2 on earth from the Sun (24hrs/day)
Interaction length is ~1 light-year of steel
1 out of 100 billion interact going through the Earth
1931 – Pauli predicts a neutral particle to explain energy and momentum non-conservation in Beta decay.
1934 - Enrico Fermi develops a comprehensive theory of radioactive decays, including Pauli's particle, Fermi calls it the neutrino (Italian: "little neutral one").
1959 - Discovery of the neutrino is announced by Clyde Cowan and Fred Reines
Neutrinos
They only interact weakly
If they have mass at all – it is very small
=Electron n
=Muon n
n1n2
n1n2
Muonn
Electronn
Resonant Matter Oscillations in the sun (MSW- Mikheev, Smirnov, Wolfenstein)
(Mikheev, Smirnov, Wolfenstein)
LMA
SMA
LOW
VAC
Aircraft moves through
air faster than speed of
sound.
Sonic Boom
Sonic boom
When a charged particle moves through
transparent media faster
than speed of light in that
media.
Cone of
light
Cherenkov radiation
Cherenkov ring on the wall
Electron or muon track
The pattern tells us the energy and type of particle
We can easily tell muons from electrons
SK+Gallium+Cholrine - flux only allowed 95% C.L.
95% excluded by SK flux-independent zenith angle energy spectrum
95% C.L allowed. - SK flux constrained w/ zenith angle energy spectrum
SK+Gallium+Cholrine - flux only allowed 95% C.L.
95% excluded by SK flux-independent zenith angle energy spectrum
95% C.L allowed. - SK flux constrained w/ zenith angle energy spectrum
(Like SK)
Fne= (35 ± 3 )% Fssm
The Winner