Lifetimes of levels inNe24

Abstract

Nuclear lifetimes of levels in $^{24}\mathrm{Ne}$ have been measured by employing the $^{22}\mathrm{Ne}(t,p)$ reaction at a triton bombarding energy of 2.9 MeV. Protons were detected by an annular silicon surface-barrier detector at an average angle of 174\ifmmode^\circ\else\textdegree\fi{}, and coincident $\ensuremath{\gamma}$ rays were detected by a Ge(Li) detector positioned at angles of 30 and 120\ifmmode^\circ\else\textdegree\fi{}. Nuclear lifetimes were extracted by the Doppler-shift-attenuation technique. Measured lifetimes of the 1.98, 3.87, and 4.76 levels are ${0.89}_{\ensuremath{-}0.29}^{+0.36}$, 0.18, and ${3.3}_{\ensuremath{-}1.2}^{+2.1}$ psec. The experimental results are well reproduced by the shell-model calculations of Robertson and Wildenthal.[NUCLEAR REACTIONS $^{22}\mathrm{Ne}(t,p)$, ${E}_{t}=2.8$ MeV; measured $\ensuremath{\sigma}({E}_{p},{E}_{\ensuremath{\gamma}},{\ensuremath{\theta}}_{\ensuremath{\gamma}})$. $^{24}\mathrm{Ne}$ deduced ${\ensuremath{\tau}}_{m}$. Solid Ne target; Doppler shift attenuation.]