Abstract
Anomalies in the excitation function of the reaction $^{72}\mathrm{Ge}(\ensuremath{\alpha},n)^{75}\mathrm{Se}$ are compared with isobaric analog resonances observed in the $^{75}\mathrm{As}(p,n)^{75}\mathrm{Se}$ reaction. The results are consisted with the interpretation that the same analog resonance is populated in both reactions. Since the ($\ensuremath{\alpha},n$) reaction through isobaric analog states is isospin forbidden in both entrance and exit channels, these results imply some isospin-breaking mechanism for the excitation of analog resonances via $\ensuremath{\alpha}$ and/or neutron channels.NUCLEAR REACTIONS $^{72}\mathrm{Ge}(\ensuremath{\alpha},n)$, $E=7.735\ensuremath{-}8.355$ MeV; measured 111 and 286 keV $\ensuremath{\gamma}$-ray yields; enriched target. $^{75}\mathrm{As}(p,n)$, $E=2.91\ensuremath{-}3.59$; measured total 0\ifmmode^\circ\else\textdegree\fi{} neutron yield. Deduced properties IAR in $^{76}\mathrm{Se}$.
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