Calculate the height of potential barrier for a head on collision of two denterons. The effective radius of deuteron can be taken to be $2 fm$ . Note that height of potential barrier is given by the coulmb repulsion between two denterons when they just touch each other .

Question

$\begin{array}{1 1} 180\;Kev \\ 180\;Mev \\ 180\;ev \\ none\;of\;these \end{array}$