We report on the first compelling observation of α decay of 151 Eu to the ground state of 147 Pm. The measurement was performed using a 6.15 g Li 6 Eu(BO 3 ) 3 crystal operated as a scintillating bolometer. The Q-value and half-life measured are: Q = 1948.9±6.9(stat.) ± 5.1(syst.) keV, and T 1/2 = (4.62 ± 0.95(stat.) ± 0.68(syst.)) × 10 18 y. The half-life prediction of nuclear theory using the Coulomb and proximity potential model are in good agreement with this experimental result.

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