The Beta-delayed neutron branching ratios (Pbn) for nuclei near doubly magic 78Ni have been directly measured using a new method combining high-resolution mass separation, reacceleration, and digital - spectroscopy of 238U fission products. The Pbn values for the very neutron-rich isotopes 76–78Cu and 83Ga were found to be much higher than previously reported and predicted. Revised calculations of the bn process, accounting for new mass measurements and an inversion of the 2p3=2 and 1f5=2 orbitals, are in better agreement with these new experimental results.
Large beta-delayed neutron emission probabilities in the 78Ni region / J. A. Winger, S. V. Ilyushkin, K. P. Rykaczewski, C. J. Gross, J. C. Batchelder, C. Goodin, R. Grzywacz, J. H. Hamilton, A. Korgul, W. Krolas, S. N. Liddick, C. Mazzocchi, S. Padgett, A. Piechaczek, M. M. Rajabali, D. Shapira, E. F. Zganjar, I. N. Borzov. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 102:14(2009 Apr 08), pp. 142502.142502.1-142502.142502.4.
Large beta-delayed neutron emission probabilities in the 78Ni region
C. Mazzocchi;
2009
Abstract
The Beta-delayed neutron branching ratios (Pbn) for nuclei near doubly magic 78Ni have been directly measured using a new method combining high-resolution mass separation, reacceleration, and digital - spectroscopy of 238U fission products. The Pbn values for the very neutron-rich isotopes 76–78Cu and 83Ga were found to be much higher than previously reported and predicted. Revised calculations of the bn process, accounting for new mass measurements and an inversion of the 2p3=2 and 1f5=2 orbitals, are in better agreement with these new experimental results.
Pubblicazioni consigliate
I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
