Reactor & Accelerator Thanks to Bob McKeown for many of the slides.

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Presentation transcript:

Reactor & Accelerator Thanks to Bob McKeown for many of the slides

June 2005Steve Elliott, NPSS Outline Reactor Neutrinos The neutrinos Past experiments What we know and what we want to learn Accelerator Neutrinos The neutrinos Past experiments What we know and what we want to learn

June 2005Steve Elliott, NPSS Distance (m) P( e  e ) Dominant  12 Oscillation Subdominant  13 Oscillation e Disappearance

June 2005Steve Elliott, NPSS  13 90, 95, 99% CL hep-ph/  m 23 2 from SK atmospheric Chooz Solar

June 2005Steve Elliott, NPSS Neutrino Oscillation Studies with Nuclear Reactors e from n-rich fission products detection via inverse beta decay ( e +p  e + +n) Measure flux and energy spectrum Improve detectors, reduce background Variety of distances L= 10m-250km

June 2005Steve Elliott, NPSS Detection Signal Coincidence signal: detect Prompt: e + annihilation  E  E prompt +E n +0.8 MeV Delayed: n capture 180  s capture time p + e 511keV   2.2 MeV  d n

June 2005Steve Elliott, NPSS 20057

June 2005Steve Elliott, NPSS KamLAND uses the entire Japanese nuclear power industry as a longbaseline source Kashiwazaki Takahama Ohi

June 2005Steve Elliott, NPSS 20059

June 2005Steve Elliott, NPSS Solar :  m 2 = 5.5x10 -5 eV 2 sin 2 2  = G.Fogli et al., PR D66, , (2002) Ratio of Measured and Expected e Flux from Reactor Neutrino Experiments

June 2005Steve Elliott, NPSS Measurement of Energy Spectrum

June 2005Steve Elliott, NPSS KamLAND best fit :  m 2 = 7.9 x eV 2 tan 2  = 0.45 KamLAND fixes mass Solar fixes angle

June 2005Steve Elliott, NPSS New Reactor Proposals Braidwood, Il Daya Bay, China Chooz, France ~1.5 km baseline Deeper/bigger Near/Far

June 2005Steve Elliott, NPSS Detector Design Studies horizontal cylinder spherical

June 2005Steve Elliott, NPSS Oscillation Formulae for Long- Baseline Neutrinos For anti-neutrinos, the J cp terms change sign.

June 2005Steve Elliott, NPSS Long Baseline Physics Goals Definitive observation of oscillatory behavior in   disappearance mode and precise determination of  m 2 23 and  23. Detection of oscillation   e in appearance mode and measurement of  13. Observe matter effects, hence sign of  m Measure  cp

June 2005Steve Elliott, NPSS CP violation and matter effects hep-ph/

June 2005Steve Elliott, NPSS T2K Phase I 0.75 MW +SK Phase II 4 MW + HyperK

June 2005Steve Elliott, NPSS HyperK

June 2005Steve Elliott, NPSS NO A Use the NUMI beam line from FermiLab. Far detector uses alternate vertical planes of active scintillator with passive wood absorber.

June 2005Steve Elliott, NPSS Off-Axis Beam For pions decaying in flight, most neutrinos are forward directed Neutrino energy is proportional to E  Neutrino energy flattens with angle, however. Allowing one to “choose” an energy by choosing the angle.

June 2005Steve Elliott, NPSS Far Detector 810 km from target km off axis

June 2005Steve Elliott, NPSS LONG baseline km

June 2005Steve Elliott, NPSS The LSND Puzzle and MiniBOONE

June 2005Steve Elliott, NPSS The Evidence for Neutrino Oscillations

June 2005Steve Elliott, NPSS Requires a 3 rd  m 2

June 2005Steve Elliott, NPSS

June 2005Steve Elliott, NPSS

June 2005Steve Elliott, NPSS Measurement of Oscillation Parameters

June 2005Steve Elliott, NPSS Typical Muon-Neutrino Event

June 2005Steve Elliott, NPSS Typical Michel Electron Event

June 2005Steve Elliott, NPSS Resources Bob Mckeown APS April 2005 (Tampa) APS neutrino study on reactors and long baseline experiments. BNL, T2K and NO A Letters of Intent Bill Louis Talks