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The low-lying structure of $^{55}$Sc has been investigated using in-beam$\gamma$-ray spectroscopy with the $^{9}$Be($^{56}$Ti,$^{55}$Sc+$\gamma$)$X$one-proton removal and $^{9}$Be($^{55}$Sc,$^{55}$Sc+$\gamma$)$X$inelastic-scattering reactions at the RIKEN Radioactive Isotope Beam Factory.Transitions with energies of 572(4), 695(5), 1539(10), 1730(20), 1854(27),2091(19), 2452(26), and 3241(39) keV are reported, and a level scheme has beenconstructed using $\gamma\gamma$ coincidence relationships and $\gamma$-rayrelative intensities. The results are compared to large-scale shell-modelcalculations in the $sd$-$pf$ model space, which account for positive-paritystates from proton-hole cross-shell excitations, and to it ab initioshell-model calculations from the in-medium similarity renormalization groupthat includes three-nucleon forces explicitly. The results of proton-removalreaction theory with the eikonal model approach were adopted to aididentification of positive-parity states in the level scheme; experimentalcounterparts of theoretical $1/2^{+}_{1}$ and $3/2^{+}_{1}$ states aresuggested from measured decay patterns. The energy of the first $3/2^{-}$state, which is sensitive to the neutron shell gap at the Fermi surface, wasdetermined. The result indicates a rapid weakening of the $N=34$ subshellclosure in $pf$-shell nuclei at $Z>20$, even when only a single proton occupiesthe $\pi f_{7/2}$ orbital.

Structure of 55Sc and development of the N=34 subshell closure