Doppler-Shift Measurements of Lifetimes of Low-Lying Levels inNa23

Abstract
Lifetimes of low-lying levels in the nucleus Na23 have been measured using the Doppler-shift-attenuation method. Precise level energies have also been deduced. The measured lifetimes or limits on lifetimes {Ex (MeV) τm (psec)} for a number of levels of Na23 are 2.078 (