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## Main Question or Discussion Point

In beta decay, positron emission, how come the condition for decay is:

M_p > M_d + 2m_e

Thats: atomic mass of parent > "daughter + twice the mass of an electron.

I'm sure there is some simple way of showing it, but I cant seem to find it!!

Also, is the most stable isobar on an atomic mass parabola the most stable one? It's a question my lecturer posed to us, and I have been thinking about it a while.

Thanks!

M_p > M_d + 2m_e

Thats: atomic mass of parent > "daughter + twice the mass of an electron.

I'm sure there is some simple way of showing it, but I cant seem to find it!!

Also, is the most stable isobar on an atomic mass parabola the most stable one? It's a question my lecturer posed to us, and I have been thinking about it a while.

Thanks!