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This experimental study of high-spin structure near N = Z = 20 nuclei wasfocused on $^{41}$K, but will also mention three newly observed $\gamma$transitions in $^{41}$Ca observed in the same reaction. High-spin states werepopulated using the $^{26}$Mg($^{18}$O, $p2n\gamma$)$^{41}$K and$^{26}$Mg($^{18}$O, $3n\gamma$)$^{41}$Ca reactions. The experiment was carriedout at an incident beam energy of 50 MeV at the Florida State University (FSU)John D. Fox Superconducting Linear Accelerator Laboratory and used the FSUhigh-purity germanium detector array. The $^{41}$K level scheme was extended to12325 keV, possibly with J$^{\pi}$ = 25/2$^-$ or 27/2$^+$, by means of 25 newtransitions and that of $^{41}$Ca to 9916 keV. Linear polarization and ameasure of angular distribution results are also reported and used to provideinformation on the spins and parities of several states in the $^{41}$K decayscheme. The results have been compared to the $spsdpf$ cross-shell FSU shellmodel interaction calculations. The theoretical results from configurationsinvolving no or one additional nucleon promoted from the $sd$ to the $fp$ shellagree relatively well with the energies of known states, while those thatinvolve multi-particle excitations paint an interesting and complex picture ofinterplay between single-particle excitations, collective pairing, anddeformation. This presents an interesting challenge for future theory.

Multiparticle-hole excitations in nuclei near N = Z = 20: $^{41}$K