TeX source:

_{92}^{238}\textrm{U} \; + \; _{0}^{1}\textrm{n}\; \rightarrow\; _{92}^{239}\textrm{U}\; \overset{\beta }{\rightarrow} \; _{93}^{239}\textrm{Np} \; \overset{\beta }{\rightarrow} \;  _{94}^{239}\textrm{Pu}