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## Homework Statement

Im being asked what is the minimum energy requiered for the proccess

e + p -> nutrino + nutron

assumptions are: 1. Kinetic energy of proton is much lower from his rest

mass, not true for the electron.

2. border line case is when nutrino energy is close to zero.

## Homework Equations

energy and momentum conservation, pc = sqrt(E^2 - m0^2*c^4) ?

## The Attempt at a Solution

i should use energy and momentum conservation but i have no idea how to

do that since i dont know what are the kinetic energies of the

proton and electron.

thank you for any help avaiable