# Could anyone explain how energy and momentum are conserved when an isolated neutron decays into a beta-minus particle?

I am not able to get to a reasonable explanation as to how momentum and energy are conserved when an electron, a proton, and a neutrino are created.

• Not clear what part you are having trouble with. – user93146 Sep 7 '18 at 20:10

Now after the neutron decays, (let's ignore the $W$ boson, that just complicates things), it shoots out three particles. Separately their momenta may take a range of values, but adding them all together, their total momentum must be 0, since we had 0 momentum to start with.