The ppI branch of the pp chain releases a total per completed chain and emits two pp…

PHYSICS · Multi-part · Fermi University Physics · Nuclear Physics · Nuclear astrophysics and applications · Nuclear astrophysics and applications

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

Problem

The ppI branch of the pp chain releases a total

Q = 26.73\,\mathrm{MeV}

per completed chain and emits two pp neutrinos, each of mean energy

0.265\,\mathrm{MeV}

. ((a)) Find the total energy carried off by neutrinos per ppI chain. ((b)) Find the percentage of

Q

this represents, and the energy left behind as heat in the star.