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We report on the precise mass measurement of the $^{173}$Hf isotope performedat the Ion Guide Isotope Separator On-Line facility using the JYFLTRAP doublePenning trap mass spectrometer. The new mass-excess value, ${\mathrm{ME} =-55390.8(30)}$ keV, is in agreement with the literature while being nine timesmore precise. The newly determined $^{173}$Hf electron-capture $Q$ value,$Q_{EC} = 1490.2(34)$ keV, allows us to firmly reject the population of anexcited state at 1578 keV in $^{173}$Lu and 11 transitions tentatively assignedto the decay of $^{173}$Hf. Our refined mass value of $^{173}$Hf reducesmass-related uncertainties in the reaction rate of$^{174}$Hf$(\gamma,n)^{173}$Hf. Thus, the rate for the main photodisintegrationdestruction channel of the $p$ nuclide $^{174}$Hf in the relevant temperatureregion for the $\gamma$ process is better constrained.

Precision mass measurement of $^{173}$Hf for nuclear structure of $^{173}$Lu and the $\gamma$ process