A revised solar model predicts the following neutrino fluxes at Earth

PHYSICS · Subjective · Fermi University Physics · Nuclear Physics · Astrophysics & Cosmology · Stellar structure, energy generation and evolution

Stars from the Inside, Ch Thermonuclear energy generation: reaction rates, burning stages and the elements they make

Problem

A revised solar model predicts the following neutrino fluxes at Earth, in

\mathrm{cm^{-2}\,s^{-1}}

. Data: pp

5.98\times10^{10}

; pep

1.5\times10^{8}

;

{}^{7}\mathrm{Be}

5.2\times10^{9}

;

{}^{8}\mathrm{B}

6.5\times10^{6}

. Each completed ppI chain emits two neutrinos from its first step (pp or pep, since pep is an alternative to one pp reaction); each completed ppII or ppIII chain emits one first-step (pp) neutrino plus one

{}^{7}\mathrm{Be}

{}^{8}\mathrm{B}

neutrino respectively. Use this counting to find the percentage of completed chains that go through ppI, ppII and ppIII.

Related theory

Nuclear Physics

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