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| Title: | WEAKENING OF THE 78Ni CORE FOR Z > 28, N > 50? | |
| Source: | FISSION AND PROPERTIES OF NEUTRON-RICH NUCLEI (pp 663-670) | |
| Author(s): | J. A. WINGER
Dept. of Physics and Astronomy, Mississippi State Univ., Mississippi State, MS 39762, USA S. V. ILYUSHKIN Dept. of Physics and Astronomy, Mississippi State Univ., Mississippi State, MS 39762, USA C. J. GROSS Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA K. P. RYKACZEWSKI Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA D. SHAPIRA Physics Division, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA R. GRZYWACZ Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA S. N. LIDDICK Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA S. PADGETT Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA M. M. RAJABALI Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37996, USA J. C. BATCHELDER UNIRIB, Oak Ridge Associated Universities, Oak Ridge, TN 37831, USA A. KORGUL Institute of Experimental Physics, Warsaw University, Warszawa, PL 00-681, Poland W. KRÓLAS Institute of Nuclear Physics, Polish Academy of Sciences, Kraków, PL 31-342, Poland C. MAZZOCCHI IFGA, University of Milan and INFN, Milano, I-20133, Italy A. PIECHACZEK Dept. of Physics and Astronomy, Louisiana State Univ., Baton Rouge, Louisiana 70803, USA E. F. ZGANJAR Dept. of Physics and Astronomy, Louisiana State Univ., Baton Rouge, Louisiana 70803, USA C. GOODIN Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA J. H. HAMILTON Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235, USA |
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| Abstract: | The β and β-delayed neutron decay properties of 83,84,85Ga were measured at the Holifield Radioactive Ion Beam Facility (HRIBF) at Oak Ridge National Laboratory. For 83Ga we establish an extensive decay schème in the β and βn branches including observing for the first time the 247-keV transition between the νs1/2 first excited state and the νd5/2 ground state in 83Ge. The β-delayed neutron probability was found to be 69.5(2.3)%, significantly higher than the currently "accepted" value. For 84Ga, we assign a 624-keV γ ray as depopulating the  state in 84Ge, indicating that the  states for the N = 52 isotones continue to decrease in energy below mid-shell. This transition has also been observed with limited statistics in the decay of 85Ga. The lowering of these states cannot be explained within the context of current shell model spaces/interactions and may require weakening of the 78Ni core. |
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