Radiative Proton Capture byC13

Abstract

A new resonance in the yield of the ${\mathrm{C}}^{13}(p, \gamma ){\mathrm{N}}^{14}$ reaction has been observed at $E_p=3.11\mathrm{}\pm 0.01$ Mev with a total width of 30±3 kev and a peak cross section of 0.70±0.14 millibarn for the ground state transition. An assignment of $2^{-}$ has been made for this 10.43-Mev level in ${\mathrm{N}}^{14}$ which results from the capture of $d$-wave protons and decays mainly by electric dipole radiation to the ground state. This result is inferred from the observed angular correlation of $W\left(\theta \right)=1-(0.40\mathrm{}\pm 0.02)P_2\left(cos\theta \right)$ and the large radiation width of 17 ev. It is most probably a $T=1\mathrm{}$ state. There is about a 10% cascade through the 6.44-Mev level of ${\mathrm{N}}^{14}$.