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The production of ultra-pure raw material is a crucial step to ensure therequired background level in rare event searches. In this work, we establish aninnovative technique developed to produce high-purity (99.999%) granular zinc.We demonstrate the effectiveness of the refining procedure by measuring theinternal contaminations of the purified zinc with a high-purity germaniumdetector at the Laboratori Nazionali del Gran Sasso. The total activity ofcosmogenic activated nuclides is measured at the level of a few mBq/kg, as wellas limits on naturally occurring radionuclides are set to less than mBq/kg. Theexcellent radiopurity of the zinc sample allows us to search for electroncapture with positron emission and neutrinoless double electron capture of$^{64}$Zn, setting the currently most stringent lower limits on theirhalf-lives, $T_{1/2}^{\varepsilon\beta^+} > 2.7 \times 10^{21}\text{yr}$ (90%C.I.), and $T_{1/2}^{0\nu2\varepsilon}> 2.6 \times 10^{21}\text{yr}$ (90%C.I.), respectively.

Search for double $\beta$-decay modes of $^{64}$Zn using purified zinc