Lifetimes of the 1.02-MeV State inNe23

The lifetime of the ${\mathrm{½}}^{+}$ 1.02-MeV state in the ${\mathrm{Ne}}^{23}$ has been measured with a fast time-to-height converter. A half-life of (178±10) psec was obtained from the logarithmic slope of the distribution of time delays between protons from the ${\mathrm{Ne}}^{22}(d, p){\mathrm{Ne}}^{23}$ reaction detected in a solid-state counter and gamma rays detected with a plastic scintillator. This lifetime measurement implies a ${\frac{5}{2}}^{+}$ assignment for the ground state in ${\mathrm{Ne}}^{23}$; the deduced $B\left(E2\mathrm{}\right)\mathrm{}$ transition probability is consistent with the Nilsson model.