Abstract
Pioneer experimental indication of an extremely low alpha activity due to 151Eu isotope (equivalent to ∼10–70 disintegrations (h-kg of 
) is discussed in the framework of a simple, one-parameter model to alpha transitions recently developed by us. The present evaluated alpha activity is found equivalent to ∼18 disintegrations(h-kg)−1, in excellent agreement with the observed decay rate. Partial alpha decay half-life evaluations for 147–153Eu isotopes are also reported.
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