The nuclear halo structure is one of the exotic phenomena appearing near the drip line. Due to the Coulomb barrier, proton halo nuclei are rarer than neutron halo ones, with some different properties. However, most previous research on halos only considered the nuclei as spherical or axially deformed. Motivated by previous research on the effect of triaxial deformation on neutron halos, we analyze the effect of triaxial deformation on proton halos, based on the theoretical model including a core plus single proton, using Woods-Saxon potential, the spin-orbit coupling potential, and the Coulomb potential. In our calculation, one can find that the inclusion of triaxiality can increase the $s$-wave component for weakly bound $d$-wave protons, leading to an extra extension of density distribution on some nuclei that were previously excluded from proton halo candidates by traditional models. Additionally, triaxial deformation also affects the rms radius of the $s$-wave proton halo nuclei, increasing the consistency between theory and experiments. Therefore, future experiments on the structure of proton halo nuclei are hoped to help explore the possible triaxial deformation in more nuclides.

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• Nuclear shapes and moments
• Nuclear structure & decays
• Nucleon distribution