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The $\beta$-asymmetry parameter $\widetilde{A}$ for the Gamow-Teller decay of$^{60}$Co was measured by polarizing the radioactive nuclei with the bruteforce low-temperature nuclear-orientation method. The $^{60}$Co activity wascooled down to milliKelvin temperatures in a $^3$He-$^4$He dilutionrefrigerator in an external 13 T magnetic field. The $\beta$ particles wereobserved by a 500 ${\mu}m$ thick Si PIN diode operating at a temperature ofabout 10 K in a magnetic field of 0.6 T. Extensive GEANT4 Monte-Carlosimulations were performed to gain control over the systematic effects. Ourresult, $\widetilde{A} = -1.014(12)_{stat}(16)_{syst}$, is in agreement withthe Standard-Model value of $-0.987(9)$, which includes recoil-ordercorrections that were addressed for the first time for this isotope. Further,it enables limits to be placed on possible tensor-type charged weak currents aswell as other physics beyond the Standard Model.

Precision measurements of the $^{60}$Co $\beta$-asymmetry parameter in search for tensor currents in weak interactions