The ($p$, ${}_{}{}^6{}_{}{}^{}\mathrm{He}$) reaction was used to observe and measure the masses of the proton-rich nuclei ${}_{}{}^{45}{}_{}{}^{}\mathrm{V}$, ${}_{}{}^{49}{}_{}{}^{}\mathrm{Mn}$, and ${}_{}{}^{53}{}_{}{}^{}\mathrm{Co}$, thus completing all mirror pairs in the $f_{\frac{7}{2}}$ shell. New measurements of the masses of ${}_{}{}^{43}{}_{}{}^{}\mathrm{Ti}$, ${}_{}{}^{47}{}_{}{}^{}\mathrm{Cr}$, ${}_{}{}^{51}{}_{}{}^{}\mathrm{Fe}$, and ${}_{}{}^{55}{}_{}{}^{}\mathrm{Ni}$ were made using the (${}_{}{}^3{}_{}{}^{}\mathrm{He}$, ${}_{}{}^6{}_{}{}^{}\mathrm{He}$) reaction. Coulomb energy differences of the $T=\frac{1}{2}$ mirror pairs are extracted, and the new masses are used to predict the masses of proton-rich nuclei with $23\le Z\le 28$.

NUCLEAR REACTIONS ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$, ${}_{}{}^{50}{}_{}{}^{}\mathrm{Cr}$, ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}(p, {}_{}{}^6{}_{}{}^{}\mathrm{He})$, $E_p=46\mathrm{}$ MeV, ${}_{}{}^{27}{}_{}{}^{}\mathrm{Al}$, ${}_{}{}^{46}{}_{}{}^{}\mathrm{Ti}$, ${}_{}{}^{50}{}_{}{}^{}\mathrm{Cr}$, ${}_{}{}^{54}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{58}{}_{}{}^{}\mathrm{Ni}$(${}_{}{}^3{}_{}{}^{}\mathrm{He}$, ${}_{}{}^6{}_{}{}^{}\mathrm{He}$), $E_{{}_{}{}^3{}_{}{}^{}\mathrm{He}}=70\mathrm{}$ MeV, measured $Q$, deduced mass excess of ${}_{}{}^{43}{}_{}{}^{}\mathrm{Ti}$, ${}_{}{}^{45}{}_{}{}^{}\mathrm{V}$, ${}_{}{}^{47}{}_{}{}^{}\mathrm{Cr}$, ${}_{}{}^{49}{}_{}{}^{}\mathrm{Mn}$, ${}_{}{}^{51}{}_{}{}^{}\mathrm{Fe}$, ${}_{}{}^{53}{}_{}{}^{}\mathrm{Co}$, ${}_{}{}^{55}{}_{}{}^{}\mathrm{Ni}$, predicted masses of proton-rich nuclei with $21\le Z\le 28$.

• Received 13 January 1975

DOI:https://doi.org/10.1103/PhysRevC.12.51