${{m}_{\alpha }}\simeq 4{{m}_{p}};{{m}_{\alpha }}=7300{{m}_{\beta }}$ ${{q}_{\beta }}=\pm e;{{q}_{p}}=+e;q\alpha =+2e$ $F=E\left| q \right|=ma\Rightarrow a=\frac{\left| q \right|E}{m}$