$Q$ values were measured for 27 reactions on targets of ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{54}{}_{}{}^{}\mathrm{Cr}$, ${}_{}{}^{54,56}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}$, and ${}_{}{}^{58,60,62,64}{}_{}{}^{}\mathrm{Ni}$ with resulting uncertainties of 0.7 to 3.2 keV. Care was taken to define sources of error. A ${\chi }^2$ test on an interconnected set of 19 measurements indicates internal consistency and a comparison of eight ($d,p$) $Q$ values with ($n,\gamma$) numbers shows excellent agreement. A mass evaluation was performed on a truncated region centered on Co. The results indicate that the 1971 values for the masses of ${}_{}{}^{55}{}_{}{}^{}\mathrm{Cr}$ and ${}_{}{}^{55}{}_{}{}^{}\mathrm{Co}$ are in error. The uncertainties of the masses of ${}_{}{}^{53}{}_{}{}^{}\mathrm{Fe}$ and ${}_{}{}^{61}{}_{}{}^{}\mathrm{Co}$ are greatly reduced. The question of the ${}_{}{}^{57}{}_{}{}^{}\mathrm{Fe}$ mass raised in The 1971 Atomic Mass Evaluation is not entirely resolved and consequently the absolute values of some masses in this region are still uncertain to about 5 keV although the $Q$ values are improved.

NUCLEAR REACTIONS ${}_{}{}^{54,56}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}$, ${}_{}{}^{58,60,62,64}{}_{}{}^{}\mathrm{Ni}\mathrm{}(p,a)\mathrm{}$; ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}$, ${}_{}{}^{54}{}_{}{}^{}\mathrm{Cr}$, ${}_{}{}^{54,56}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}$, ${}_{}{}^{58,60,62}{}_{}{}^{}\mathrm{Ni}(d,p)$; ${}_{}{}^{54,56}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}$, ${}_{}{}^{60,62}{}_{}{}^{}\mathrm{Ni}\mathrm{}(d,t)\mathrm{}$; ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}$, ${}_{}{}^{60,62}{}_{}{}^{}\mathrm{Ni}\mathrm{}(d,a)\mathrm{}$; ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}({}_{}{}^3{}_{}{}^{}\mathrm{He},d)$; ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}({}_{}{}^3{}_{}{}^{}\mathrm{He},a)$; ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{59}{}_{}{}^{}\mathrm{Co}\mathrm{}(a,p)\mathrm{}$ measured $Q$ values. ${}_{}{}^{12}{}_{}{}^{}\mathrm{C}\mathrm{}(d,d)\mathrm{}$, ($p,p$) measured $E_x$. Mass adjustment.

• Received 3 July 1974

DOI:https://doi.org/10.1103/PhysRevC.10.2449