the SUDBURY neutrino detector

(1 kiloliter of D2O surrounded by 9500 photomultiplier tubes)
  it's greek to me


inverse beta decay
(CC = charged current)
fission 
(NC =  neutral current)
elastic scattering 
(ES = electron scattering)
(identical to the SK experiment)


neutrino
reactions

νe  +   d  --> 
p  +  p  +  e-

νμτ
+   d  -->  p  +  p  +  μ--
can't happen]


  νi + d
  -->  νi  + p + n

[i stands for any flavor of ν:
e or μ  or 

comes in 2 varieties:
νi   +    e   -->    νi   +  e

νe   +   e-     -->    e-    +  νe
(but with a 6x greater probability than above)

threshold
energy

1.4 Mev  for  e- production

110 Mev  for  μ- production

1.8 Gev  for τ- production



2.2 Mev =

binding energy
of  deuterium


5 Mev
or else insignificant
Cerenkov radiation
over the background

detection
method

e- Cerenkov radiation
(isotropic)
n capture by
deuterium produces
an excited tritium
that decays via a
6.25-Mev γ ray

e-   Cerenkov radiation
(directed)
what's being measured
only the νe flux
the total ν flux
mostly νe flux with some νi flux

experimental detections
(relative to theoretical neutrino flux)



0.33 +  0.03


0.97 + 0.05

0.46  +  0.03  (SNO)
0.43  +  0.01  (SK data)  

experimental/theoretical
(if electron neutrinos oscillate equally
into muon and tauon neutrinos)



1.0 +  0.1


0.97 + 0.05


1.0  + 0.0

capture rate

φνe = 1.76 + 0.11 
(x 106  νe/cm2/s)

φνi = 5.09 + 0.11 
φνi = 2.39  + 0.23
= φνe + (φνμντ)/7

φ&vu;i = 2.30  + 0.03  (SK data) ]