Alpha-Radioactivity in the 82-Neutron Region
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Abstract
In a survey for alpha-activity among cyclotron produced neutron deficient nuclides of the elements below lead, alpha-activity was detected in a number of rare earth nuclides with atomic number greater than 62, that of samarium, and in a gold and a mercury nuclide. A detailed study of the alpha-active nuclides of europium, gadolinium, terbium, and dysprosium was made.The relationship between alpha-decay rates and energies in the rare earth region is examined. Calculations of the "effective nuclear radius for alpha-particles" were made using five different alpha-decay rate formulas.The trends of the rare earth alpha-decay energies are discussed, particularly with respect to the discontinuity in neutron binding energies at the closed shell of 82 neutrons.
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