The 9.17-Mev radiation from the reaction ${\mathrm{C}}^{13}(p, \gamma ){\mathrm{N}}^{14}$, $E_p=1.75\mathrm{}$ Mev, was used to obtain resonant absorption in the inverse process ${\mathrm{N}}^{14}+\gamma \to {\mathrm{N}}^{14*}(E_{\mathrm{ex}}=9.17\mathrm{} \mathrm{Mev})$. The strength of the absorption was measured as a function of absorber thickness. Analysis of the measurements gives $\Gamma =(77\mathrm{}\pm 12)$ ev and $\omega {\Gamma }_{\gamma }=(14.5\mathrm{}\pm 2)$ ev. The latter value indicates dipole radiation.

• Received 16 March 1959

DOI:https://doi.org/10.1103/PhysRev.115.986