If the Sun is assumed to be a uniform spherical plasma consisting of nucleons, with radius 7
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If the Sun is assumed to be a uniform spherical plasma consisting of nucleons, with radius 7 × 105 km and total mass 2 × 1030 kg, calculate the mean free path λ = 1/nσ of solar neutrinos from the dominant reaction (2.35). Here n is the number of nucleons per unit volume and σ, the neutrino-nucleon cross-section, may be written σ = 0.7EL × 10−42 m2, where EL is the neutrino laboratory energy in GeV.
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