Proton decay ofT>hole states in heavy nuclei by means of the (He3,αp) reaction onZr96andSm144

Abstract

The $^{96}\mathrm{Zr}(^{3}\mathrm{He},\ensuremath{\alpha}p)^{94}\mathrm{Y}$ and the $^{144}\mathrm{Sm}(^{3}\mathrm{He},\ensuremath{\alpha}p)^{142}\mathrm{Pm}$ reactions studied at 39 MeV incident energy were used to investigate the proton decay of hole analog states. The $\ensuremath{\alpha}$ particles leading to these unbound levels in $^{95}\mathrm{Zr}$ and $^{143}\mathrm{Sm}$ were detected near 0\ifmmode^\circ\else\textdegree\fi{} in coincidence with the protons emitted from the ${T}_{>}$ hole states. In the case of the $2{d}_{\frac{5}{2}}$ hole analog state in $^{143}\mathrm{Sm}$ only a mean value for the proton branching ratio has been determined from this study. Proton hole-neutron hole states have been observed in $^{94}\mathrm{Y}$ through the proton decay of the $2{p}_{\frac{1}{2}}$, $2{p}_{\frac{3}{2}}$, and $1{f}_{\frac{5}{2}}$ ${T}_{>}$ levels of $^{95}\mathrm{Zr}$. Analysis of the $\ensuremath{\alpha}\ensuremath{-}p$ angular correlations has given inelastic proton widths, spins, and parities as well as shell model configurations of several of the observed residual states in $^{94}\mathrm{Y}$.NUCLEAR REACTIONS $^{96}\mathrm{Zr}(^{3}\mathrm{He},\ensuremath{\alpha}p)$, $^{144}\mathrm{Sm}(^{3}\mathrm{He},\ensuremath{\alpha}p)$, $E=39$ MeV; measured $\ensuremath{\sigma}({E}_{\ensuremath{\alpha}},{E}_{p},{\ensuremath{\theta}}_{p})$. $^{95}\mathrm{Zr}$, $^{143}\mathrm{Sm}$ deduced IAS, proton branching. $^{94}\mathrm{Y}$ deduced levels, $J$, $\ensuremath{\pi}$, ${\ensuremath{\Gamma}}_{{p}^{\ensuremath{'}}}$, spectroscopic factors. Enriched targets. 0\ifmmode^\circ\else\textdegree\fi{} spectrometer.