How much energy is released in the first nuclear reaction of the p-p chain which produces energy in lower-mass stars like the Sun? The value of 1.44 MeV is given in many sources, but I don't understand why. The reaction is:
p + p -> 2H + e+ + νe
Mass of proton is 938.783 Mev, mass of deuterium 1876.124 MeV, mass of electron 0.511 MeV. So I would expect the production of
2 * 938.783 - 1876.124 - 0.511 = 0.931 MeV
I get the 1.44 MeV without positron on the right side... In the stellar interior anihilation of the positron with a free electron is expected. Sometimes, it is said that taking the anihilation into account gives the 1.44 MeV value, but I can't see why.
The energy produced in anihilation should be 2 * 0.511 MeV, that is 1.022 MeV, a this plus 0.931 MeV gives 1.862 MeV, not 1.44 MeV.