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Phys Rev Lett. 2009 Apr 10;102(14):142502. Epub 2009 Apr 8.

Large beta-delayed neutron emission probabilities in the 78Ni region.

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  • 1Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA.


The beta-delayed neutron branching ratios (P{betan}) for nuclei near doubly magic 78Ni have been directly measured using a new method combining high-resolution mass separation, reacceleration, and digital beta-gamma spectroscopy of 238U fission products. The P{betan} values for the very neutron-rich isotopes ;{76-78}Cu and 83Ga were found to be much higher than previously reported and predicted. Revised calculations of the betan process, accounting for new mass measurements and an inversion of the pi2p{3/2} and pi1f{5/2} orbitals, are in better agreement with these new experimental results.

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