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Snowmass Workshop |
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A.
Bettini July 3 2001 | |
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The energy region beyond the reach of present end
future accelerators can be explored searching for naturally
happening phenomena. But they are extremely rare |
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Extreme energy frontier = the frontier of
background and disturbance
reduction | |
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1400 m rock overburden |
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Flat cross-section |
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Low n fluence from rock
(CaCO3) |
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Cosmic µ flux attenuation = 10–6 (1
/m2 h) |
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Underground area 18 000 m2 |
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Accelerator laboratory standard facilities on the
surface |
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Operational budget 25 Glit/yr |
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Winter (W) - Summer (S) event rate in (SNU), after
geometric effect removal |
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GNO is not in real time. |
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Winter: long nights. Summer: short
nights |
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a means to look for day-night effects (mainly from
pp)) |
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Fogli e co. |
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Method may define parameters in the LOW solution,
but larger sensitive masses are necessary. |
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Very expensive today. 100 t of Ga = 250
M$ | |
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Detect direct oscillation signals @
Dm2 (atmospheric) |
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Prove if oscillation is between
nm and nt or else |
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detect t appearance |
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Improve knowledge of mixing parameters
and Dm2 |
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CNGS project |
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OPERA |
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ICARUS |
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Atmospheric neutrinos |
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MONOLITH proposal |
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Detect direct oscillation signals @
dm2 ( “solar”) |
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Improve knowledge of mixing parameters
and
dm2 |
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Choose solar solution |
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GNO |
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BOREXINO |
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LENS proposal |
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Measure relevant cross-sections and
screening effect |
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LUNA2 |
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Nature of neutrinos: Majorana or
Dirac |
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Measure sign of
Dm2 |
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Measure absolute values of the
masses |
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Neutrino-less double beta
decay |
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HM, GENIUS-TF, GENINO,
GENIUS |
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MIBETA, CUORICINO, CUORE |
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CP violation not at reach for a while.
Doubly suppressed. dm2 /Dm2 and
|Ue3|2 are both
small! | |
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Day-night, yearly averaged, asymmetry (in %)
normalised to SSM due to e-neutrino regeneration in the Earth
(mainly at Be energy) |
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Fogli and
co. | |
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To complete the solar neutrino program, we
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sensitivity to the low energy (pp) neutrinos in
real time |
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flavour sensitivity |
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source sensitivity (pp.
7Be,8B) | |
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Neutrinos have only one “charge”: lepton
number |
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If total lepton number is not conserved, then
e-neutrino and anti e-neutrino (etc.) may be the same particle:
Majorana neutrino |
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neutrinisation |
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(r-process) | |
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