Population of intrinsic high spin states with the directSn116(α,p)Sb119reaction

Abstract

The $^{116}\mathrm{Sn}$($\ensuremath{\alpha}$,$p$)$^{119}\mathrm{Sb}$ reaction at ${E}_{\ensuremath{\alpha}}=35.6$ MeV has been used to locate previously unknown high spin states in $^{119}\mathrm{Sb}$. Cluster distorted-wave Born-approximation calculations have been employed to identify $L=10$ (${J}^{\ensuremath{\pi}}=\frac{19}{{2}^{+}}, \frac{21}{{2}^{+}}$) transfers to states at 4.120\ifmmode\pm\else\textpm\fi{}0.015 and 4.210\ifmmode\pm\else\textpm\fi{}0.015 MeV. A state located at 4.020\ifmmode\pm\else\textpm\fi{}.015 MeV may be fit by either $L=12 or 14$ distorted-wave Born-approximation curves. These high spin states are not members of the previously identified ${K}^{\ensuremath{\pi}}=\frac{9}{{2}^{+}}$ rotational band. No evidence for population of this $\frac{9}{{2}^{+}}$ band was observed. Residual interaction matrix elements for the ${(\ensuremath{\nu}{h}_{\frac{11}{2}}\ensuremath{\pi}{s}_{\frac{1}{2}})}_{{5}^{\ensuremath{-}},{6}^{\ensuremath{-}}}$ configurations have been deduced, assuming simple wave functions for the states populated by $L=10$ transfers. The resulting matrix elements are in excellent agreement with the predictions of a $\ensuremath{\delta}$ force, as are other matrix elements extracted from the odd-odd Sb spectra.NUCLEAR REACTIONS $^{116}\mathrm{Sn}$($\ensuremath{\alpha}$,$p$)$^{119}\mathrm{Sb}$, separated isotope, measured $\ensuremath{\sigma}({E}_{p},\ensuremath{\theta})$, cluster DWBA analysis, deduced residual interaction matrix elements.