Masses of ${}^{56,57}\mathrm{Fe}$, ${}^{53}\mathrm{Co}$${}^m$, ${}^{53,56}\mathrm{Co}$, ${}^{55,56,57}\mathrm{Ni}$, ${}^{57,58}\mathrm{Cu}$, and ${}^{59,60}\mathrm{Zn}$ have been determined with the JYFLTRAP Penning trap mass spectrometer at the Ion-Guide Isotope Separator On-Line facility with a precision of $\delta m/m⩽3\times {10}^{-8}$. The $Q_{\mathrm{EC}}$ values for ${}^{53}\mathrm{Co}$, ${}^{55}\mathrm{Ni}$, ${}^{56}\mathrm{Ni}$, ${}^{57}\mathrm{Cu}$, ${}^{58}\mathrm{Cu}$, and ${}^{59}\mathrm{Zn}$ have been measured directly with a typical precision of better than $0.7\hspace{0.5em}\mathrm{keV}$ and Coulomb displacement energies have been determined. The $Q$ values for proton captures on ${}^{55}\mathrm{Co}$, ${}^{56}\mathrm{Ni}$, ${}^{58}\mathrm{Cu}$, and ${}^{59}\mathrm{Cu}$ have been measured directly. The precision of the proton-capture $Q$ value for ${}^{56}\mathrm{Ni}$$(p,\gamma )$${}^{57}\mathrm{Cu}$, $Q_{(p,\gamma )}=689.69(51)\hspace{0.5em}\mathrm{keV}$, crucial for astrophysical $\mathit{rp}$-process calculations, has been improved by a factor of 37. The excitation energy of the proton-emitting spin-gap isomer ${}^{53}\mathrm{Co}$${}^m$ has been measured precisely, $E_x=3\hspace{0.5em}174.3(10)\hspace{0.5em}\mathrm{keV}$, and a Coulomb energy difference of $133.9(10)\hspace{0.5em}\mathrm{keV}$ for the $19/2^{-}$ state has been obtained. Except for ${}^{53}\mathrm{Co}$, the mass values have been adjusted within a network of 17 frequency ratio measurements between 13 nuclides, which allowed also a determination of the reference masses ${}^{55}\mathrm{Co}$, ${}^{58}\mathrm{Ni}$, and ${}^{59}\mathrm{Cu}$.

• Received 6 July 2010

DOI:https://doi.org/10.1103/PhysRevC.82.034311