Large beta-delayed neutron emission probabilities in the 78Ni region.
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.
Winger
J A
JA
Department of Physics and Astronomy, Mississippi State University, Mississippi State, Mississippi 39762, USA. j.a.winger@msstate.edu
Ilyushkin
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Rykaczewski
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Gross
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Batchelder
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Goodin
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Grzywacz
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Hamilton
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Korgul
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Królas
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Padgett
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Piechaczek
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