Decays ofNa26andNa27

Abstract

${}_{}{}^{26}{}_{}{}^{}\mathrm{Na}$ and ${}_{}{}^{27}{}_{}{}^{}\mathrm{Na}$ were produced in the ${}_{}{}^{10}{}_{}{}^{}\mathrm{B}({}_{}{}^{18}{}_{}{}^{}\mathrm{O},2p){}_{}{}^{26}{}_{}{}^{}\mathrm{Na}$ and ${}_{}{}^{11}{}_{}{}^{}\mathrm{B}({}_{}{}^{18}{}_{}{}^{}\mathrm{O},2p){}_{}{}^{27}{}_{}{}^{}\mathrm{Na}$ reactions by bombarding pellets of boron with 42-MeV ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}$ ions. ${}_{}{}^{26}{}_{}{}^{}\mathrm{Na}$ was also studied using the ${}_{}{}^{18}{}_{}{}^{}\mathrm{O}({}_{}{}^{13}{}_{}{}^{}\mathrm{C},p\alpha ){}_{}{}^{26}{}_{}{}^{}\mathrm{Na}$ reaction at a ${}_{}{}^{13}{}_{}{}^{}\mathrm{C}$ beam energy of 35 MeV. After transfer of the target in a rabbit the $\beta$ and $\gamma$ rays were measured with NE102 and Ge(Li) detectors. ${}_{}{}^{26}{}_{}{}^{}\mathrm{Na}$ decays with $T_{\frac{1}{2}}=1.087\mathrm{}\pm 0.012$ sec and emits 10 $\gamma$ rays involving 7 excited states of ${}_{}{}^{26}{}_{}{}^{}\mathrm{Mg}$. From the end-point energy of $\beta$ rays in coincidence with 1809-keV $\gamma$ rays the mass excess of ${}_{}{}^{26}{}_{}{}^{}\mathrm{Na}$ is found to be -7004 ± 200 keV in agreement with the more accurate data of reaction $Q$ values. ${}_{}{}^{27}{}_{}{}^{}\mathrm{Na}$ decays with $T_{\frac{1}{2}}=280\mathrm{}\pm 20$ msec in agreement with a previous measurement. $\gamma$ rays of 984.77 ± 0.20 and 1698.5 ± 0.5 keV are emitted with...