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We report the mass measurement of $^{56}$Cu, using the LEBIT 9.4T Penningtrap mass spectrometer at the National Superconducting Cyclotron Laboratory atMichigan State University. The mass of $^{56}$Cu is critical for constrainingthe reaction rates of the$^{55}$Ni(p,$\gamma$)$^{56}$Cu(p,$\gamma$)$^{57}$Zn($\beta^+$)$^{57}$Cu bypassaround the $^{56}$Ni waiting point. Previous recommended mass excess valueshave disagreed by several hundred keV. Our new value, ME=$-38 626.7(6.4)$ keV,is a factor of 30 more precise than the suggested value from the 2012 atomicmass evaluation [Chin. Phys. C {\bf{36}}, 1603 (2012)], and more than a factorof 12 more precise than values calculated using local mass extrapolations,while agreeing with the newest 2016 atomic mass evaluation value [Chin. Phys. C{\bf{41}}, 030003 (2017)]. The new experimental average was used to calculatethe astrophysical $^{55}$Ni(p,$\gamma$) and $^{57}$Zn($\gamma$,p) reactionrates and perform reaction network calculations of the rp-process. These showthat the rp-process flow redirects around the $^{56}$Ni waiting point throughthe $^{55}$Ni(p,$\gamma$) route, allowing it to proceed to higher masses morequickly and resulting in a reduction in ashes around this waiting point and anenhancement to higher-mass ashes.

High-precision mass measurement of $^{56}$Cu and the redirection of the rp-process flow