Threshold and Resonances inC14(p,n)N14Reaction and Energy Levels ofN15

Abstract

The threshold energy required to induce the ($p,n$) reaction in ${\mathrm{C}}^{14}$ has been measured to be $E_t=0.664\mathrm{}\pm 0.009$ Mev or a reaction energy of -0.620±0.009 Mev. This reaction is the inverse of the ${\mathrm{N}}^{14}\mathrm{}(n,p)\mathrm{}{\mathrm{C}}^{14}$ process studied by Hughes and Eggler and their observed reaction energy $Q_{n,p}=0.597\mathrm{}\pm 0.009$ Mev can be compared with the negative of the reaction energy observed here. Six resonances have been observed in the process at 1.14, 1.30, 1.47, 2.05, 2.21, and 2.65 Mev, three of which can be correlated with those previously observed in the ${\mathrm{N}}^{14}\mathrm{}(n,p)\mathrm{}$ reaction. The cross section at the first resonance at 1.14 Mev has been measured to be approximately 0.7 barn.