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We report high-precision mass measurements of $^{50-55}$Sc isotopes performedat the LEBIT facility at NSCL and at the TITAN facility at TRIUMF. Our resultsprovide a substantial reduction of their uncertainties and indicate significantdeviations, up to 0.7 MeV, from the previously recommended mass values for$^{53-55}$Sc. The results of this work provide an important update to thedescription of emerging closed-shell phenomena at neutron numbers $N=32$ and$N=34$ above proton-magic $Z=20$. In particular, they finally enable a completeand precise characterization of the trends in ground state binding energiesalong the $N=32$ isotone, confirming that the empirical neutron shell gapenergies peak at the doubly-magic $^{52}$Ca. Moreover, our data, combined withother recent measurements, does not support the existence of closed neutronshell in $^{55}$Sc at $N=34$. The results were compared to predictions fromboth \emph{ab initio} and phenomenological nuclear theories, which all hadsuccess describing $N=32$ neutron shell gap energies but were highly disparatein the description of the $N=34$ isotone.

Precision mass measurements of neutron-rich scandium isotopes refine the evolution of $N=32$ and $N=34$ shell closures