One of the source of neutrinos in the Sun is the decay 8 B2 + e +

Question:

One of the source of neutrinos in the Sun is the decay 8B→2α + e+ + νe. The boron neutrinos dominate the energy spectrum around 10 MeV. Consider the energy interval 9 MeV < Eν < 11 MeV. In absence of oscillations their flux at the Earth should be Φ =1010 m–2s–1. The Super-Kamiokande detector is a 22.5 ktfiducial mass water Cherenkov detector in the Kamioka underground observatory.It detects these neutrinos by observing the electron produced in the elastic scatteringνe + e- → νe + e-. Assume the cross-section σ (νee) = 10-47 m2 and a detection efficiency ε = 50%. How many events per year are expected? How much is the observed rate in comparison? What is the reason for the difference, if there is one?

Fantastic news! We've Found the answer you've been seeking!

Step by Step Answer:

Related Book For  book-img-for-question
Question Posted: