In a simple model for a radioactive nucleus, an alpha particle $($m$=6\mathrm{.}641027$kgm$=6\mathrm{.}641027$kg$)$ is trapped by a square barrier that has width $2\mathrm{.}0$ fmfm and height $30\mathrm{.}0$ MeVMeV. In a simple model for a radioactive nucleus, an alpha particle $($m$=6\mathrm{.}641027$kgm$=6\mathrm{.}641027$kg$)$ is trapped by a square barrier that has width $2\mathrm{.}0$ fmfm and height $30\mathrm{.}0$ MeVMeV.