Please explain

Asked by  | 21st Mar, 2009, 11:08: AM

Expert Answer:

In all the cases where β+ decay is allowed energetically (and the proton is a part of a nucleus with electron shells), it is accompanied by the electron capture process, when an atomic electron is captured by a nucleus with the emission of a neutrino:

energy  p+  e  →  n0  νe

But if the energy difference between initial and final states is low (less than 2mec2), then β+ decay is not energetically possible, and electron capture is the sole decay mode.

Answered by  | 28th Mar, 2009, 06:22: PM

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