Nuclear Energy Levels of ${\mathrm{Cr}}^{52}$, ${\mathrm{Mn}}^{55}$, and ${\mathrm{Zn}}^{66}$

Nuclear energy levels of ${\mathrm{Cr}}^{52}$, ${\mathrm{Mn}}^{55}$, and ${\mathrm{Zn}}^{66}$ have been determined by analyses of particles from the ${\mathrm{Cr}}^{52}(p,p^{\prime }){\mathrm{Cr}}^{52}$, ${\mathrm{Mn}}^{55}(p,\alpha ){\mathrm{Cr}}^{52}$, ${\mathrm{Mn}}^{55}(p,p^{\prime }){\mathrm{Mn}}^{55}$, ${\mathrm{Zn}}^{66}(p,p^{\prime }){\mathrm{Zn}}^{66}$, and ${\mathrm{Ga}}^{69}(p,\alpha ){\mathrm{Zn}}^{66}$ reactions with a broadrange single-gap magnetic spectrograph. In the first 6.3 MeV of excitation energy, 66 levels of ${\mathrm{Cr}}^{52}$; in the first 3.9 MeV, 62 levels of ${\mathrm{Mn}}^{55}$; and in the first 4.8 MeV, 74 levels of ${\mathrm{Zn}}^{66}$ were resolved and investigated.