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The low-lying excited states in the neutron-deficient $N=Z+1$ nucleus$^{87}_{43}$Tc$^{\ }_{44}$ have been studied via the fusion-evaporationreaction $^{54}$Fe($^{36}$Ar, $2n1p$)$^{87}$Tc at the Grand Acc\'el\'erateurNational d'Ions Lourds (GANIL), France. The AGATA spectrometer was used inconjunction with the auxiliary NEDA, Neutron Wall, and DIAMANT detector arraysto measure coincident prompt $\gamma$-rays, neutrons, and charged particlesemitted in the reaction. A level scheme of $^{87}$Tc from the(9/2$^{+}_{g.s.}$) state to the (33/2$^{+}_{1}$) state was established based on6 mutually coincident $\gamma$-ray transitions. The constructed level structureexhibits a rotational behavior with a sharp backbending at $\hbar\omega\approx0.50$ MeV. A decrease in alignment frequency and increase in alignmentsharpness in the odd-mass isotonic chains around $N=44$ is proposed as aneffect of the enhanced isoscalar neutron-proton interactions in odd-mass nucleiwhen approaching the $N=Z$ line.

Evidence for enhanced neutron-proton correlations from the level structure of the $N=Z+1$ nucleus $^{87}_{43}$Tc$^{\ }_{44}$