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The indication for the α decay of 151 Eu (Qα=1.964 MeV) with the half-life T1/2α=5−3+11×1018 yr has been observed for the first time with the help of a low background CaF 2 (Eu) crystal scintillator (mass of 370 g) in measurement at the Gran Sasso National Laboratories of the INFN during 7426 h. In a conservative approach the lower limit on the half-life of 151 Eu has been...
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