The solar neutrino problem

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The solar neutrino problem

• Motohiro Ichinose

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The purpose

• We want to know what is going on inside the sun.
• Electromagnetic radiation is interacted with
  matter till it reaches to the surface of the Sun.
  
• Distoted information
• Nuetrino is hardly interact with the matter
• True information

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Key topics

• 1.How nuetrino is created inside the sun?
• 2.How much energy they carry?
• 3.How to detect Nuetrino?
• 4.the experiment and theory
• 5.nuetrino oscillation

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1.How nuetrino is created inside the sun?

• Hydogen-burning
• N --- p e- ve B-decay
• P --- n e ve invert B-decay
• Conserved charge
• Conserved lepton number
• Note whenever P --- n, Nuetrino appears

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2.How much energy they carry?

• Hydrogen ---- helium
• Common to all chain
• P P --- d e ve 0.423
  (Mev)
• P d --- 3He ganma 5.493 (Mev)
• PP1 chain
• 3He 3He --- 4He P P 12.86 (Mev)
• PP2 chain
• 3He 4He --- 7Be Ganma 1.586 (Mev)
• 7Be e- ---7Li ve 0.861
  (Mev)
• 7Li P --- 4He 4He 17.34 (Mev)
• PP3-chain
• 7Be P --- 8B Ganma 0.135 (Mev)
• 8B --- 8Be e ve 18.07 (Mev)

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CNO cycling
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Neutrino energy
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3.How to detect Nuetrino?

• Chemical reaction
• Ve 37Cl --- 37Ar e- (0.813Mev)
• Ve 71Ga --- 71Ge e- (0.232Mev)
• Nuetrinoelectron scattering(Cherenkov radiation)
• Ve d --- p n e-
• All types of nuetrino
• Ve 2H --- p n e-
• Vx 2H --- p p Vx

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4.the experiment and theory

• Standard solar model 7.9 SNU for ve 37Cl, 127
  SNU for ve 71Ga
• Experiment value is 2.55 SNU and 77 SNU
• The reason
• detecter is only sensitive to high-energy
  neutrinos
• Neutrino oscillation

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5.nuetrino oscillation

• Nuetrino has 3 generation
• Ve, vnyu, vtau
• The experiment are only sensitive to the
  electron-nuetrino.
• If they change their flavor during the
  propagation,
• Nuetrino flux is less than the theory does make
  sense.
• 8B dacay matches the experiment and theory