Nuclear structure ofTc94

Abstract

Levels in $^{94}\mathrm{Tc}$ up to an excitation of 4.5 MeV were populated by means of the $^{92}\mathrm{Mo}$($^{3}\mathrm{He}$,$p$)$^{94}\mathrm{Tc}$ reaction at ${E}_{^{3}\mathrm{He}}=25$ MeV. Distorted-wave Born-approximation analyses of the proton angular distributions lead to spin and parity assignments for several levels. Coupled channel calculations predict that contributions of a sequential ($p\ensuremath{-}n$) transfer mechanism are important and angular distributions for the lowest ${0}^{+}$, ${1}^{+}$, and ${2}^{+}$ states are better accounted for by interference effects between one- and two-step processes. A possible ${0}^{+}$ state at 2.72 MeV excitation is suggested to be the [${{d}_{\frac{5}{2}}}^{p}{{d}_{\frac{5}{2}}}^{n}$] antianalog of the $^{94}\mathrm{Mo}$ ground state.NUCLEAR REACTIONS $^{92}\mathrm{Mo}$ ($^{3}\mathrm{He}$, $p$), $E=25$ MeV; measured $\ensuremath{\sigma}(Ep, \ensuremath{\theta})$, $\ensuremath{\theta}=5\ifmmode^\circ\else\textdegree\fi{}\ensuremath{-}50\ifmmode^\circ\else\textdegree\fi{}$, $\ensuremath{\Delta}\ensuremath{\theta}=5\ifmmode^\circ\else\textdegree\fi{}$, enriched target, split-pole spectrograph. $^{94}\mathrm{Tc}$ deduced levels, ${L}_{\mathrm{np}}$, ${J}^{\ensuremath{\pi}}$. DWBA and CRC analyses.