Abstract

The 0\ifmmode^\circ\else\textdegree\fi{} differential cross sections for the $^{11}\mathrm{B}$(\ensuremath{\alpha},n${)}^{14}$N, $^{12}\mathrm{C}$(\ensuremath{\alpha},n${)}^{15}$O, and $^{24}\mathrm{Mg}$ (\ensuremath{\alpha},n${)}^{27}$Si reactions were measured at ${E}_{\ensuremath{\alpha}}$=47.4 MeV. Well-known states of high spin in $^{15}\mathrm{O}$ were used to determine the excitation energy of states in $^{14}\mathrm{N}$ and $^{27}\mathrm{Si}$. Several states of high excitation energy in these nuclei are reported. The energies of these states are consistent with particle-hole weak coupling calculations for high spin states. Comparisons with previous experiments are made where possible.

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