Studies on theNe22(d, pγ)Ne23Reaction

Abstract

States of ${\mathrm{Ne}}^{23}$ below 4 MeV in excitation energy have been studied via the ${\mathrm{Ne}}^{22}(d, p\gamma ){\mathrm{Ne}}^{23}$ reaction. Deexcitation branching ratios for these states were determined by two-parameter analysis of proton-gamma coincidence spectra observed at a bombarding energy $E_d=3.40\mathrm{}$ MeV. Proton-gamma angular correlations were measured in a collinear geometry at $E_d=2.72\mathrm{} \mathrm{and} 3.52$ MeV in order to obtain information on possible spin assignments for the 1.70-, 1.83-, and 2.31-MeV states. Assuming the most probable value of $J=\frac{5}{2}$ for the ${\mathrm{Ne}}^{23}$ ground state, these results indicate $J=\frac{3}{2} or \frac{7}{2}$ for the 1.70-MeV state and $J=\frac{3}{2}$ for the 1.83-MeV state. A gamma-gamma angular correlation was also studied at $E_d=2.85\mathrm{}$ MeV, leading, when combined with previous information, to the assignment $J^{\pi }={\frac{3}{2}}^{-}$ for the 3.22-MeV state. Presently available evidence on the states of ${\mathrm{Ne}}^{23}$ is shown to be consistent in general with the predictions of a strong-coupling collective model; tentative assignments of members of Nilsson rotational bands are presented for these states.