Large β-delayed neutron emission probabilities in the Ni78 region

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The β-delayed neutron branching ratios (Pβn) for nuclei near doubly magic Ni78 have been directly measured using a new method combining high-resolution mass separation, reacceleration, and digital β-γ spectroscopy of U238 fission products. The Pβn values for the very neutron-rich isotopes Cu76-78 and Ga83 were found to be much higher than previously reported and predicted. Revised calculations of the βn process, accounting for new mass measurements and an inversion of the π2p3/2 and π1f5/2 orbitals, are in better agreement with these new experimental results. © 2009 The American Physical Society.

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Physical Review Letters

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