Beta decay ofC16andN17

The delayed neutron emitters ${}_{}{}^{16}{}_{}{}^{}\mathrm{C}$ and ${}_{}{}^{17}{}_{}{}^{}\mathrm{N}$ have been studied with a ${}_{}{}^3{}_{}{}^{}\mathrm{He}$ neutron detector and $\gamma$ radiations have been measured with a Ge(Li) detector. ${}_{}{}^{16}{}_{}{}^{}\mathrm{C}$ was formed in the reaction ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{16}{}_{}{}^{}\mathrm{O}$)${}_{}{}^{16}{}_{}{}^{}\mathrm{C}$ with 56-MeV ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ ions, and also in the reaction ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}({}_{}{}^7{}_{}{}^{}\mathrm{Li},2\mathrm{}p){}_{}{}^{16}{}_{}{}^{}\mathrm{C}$ with 40-MeV ${}_{}{}^7{}_{}{}^{}\mathrm{Li}$ ions. The thermalized neutrons following both reactions yield together a ${}_{}{}^{16}{}_{}{}^{}\mathrm{C}$ half-life of 0.747 ± 0.008 sec with the well-known 4.17-sec ${}_{}{}^{17}{}_{}{}^{}\mathrm{N}$ activity as an accompaniment formed in the ${}_{}{}^{14}{}_{}{}^{}\mathrm{C}$(${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$, ${}_{}{}^{17}{}_{}{}^{}\mathrm{N}$)${}_{}{}^{15}{}_{}{}^{}\mathrm{N}$ and ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}({}_{}{}^7{}_{}{}^{}\mathrm{Li},p){}_{}{}^{17}{}_{}{}^{}\mathrm{N}$ reactions. The neutron spectra in a bare