Shapes of the neutron-rich 88-94Kr nuclei |
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| Authors: | T Rzaca-Urban W Urban A Kaczor JL Durell MJ Leddy MA Jones WR Phillips AG Smith BJ Varley I Ahmad LR Morss M Bentaleb E Lubkiewicz N Schulz |
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| Institution: | (1) Institue of Experimental Physics, Warsaw University, ul.Hoża 69, 00-681 Warszawa, Poland, PL;(2) Schuster Laboratory, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL, UK., GB;(3) Argonne National Laboratory, Argonne, IL 60439, U.S.A., US;(4) Institut de Recherches Subatomiques UMR7500, CNRS-IN2P3 et Université Louis Pasteur, 67037 Strasbourg, France, FR |
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| Abstract: | Neutron-rich, 88-94Kr nuclei, populated in spontaneous fission of 248Cm, have been studied with EUROGAM 2, by measuring prompt γ-rays. Many new excited states in even-even Kr isotopes have been
identified. For the first time spins and parities were determined experimentally in these nuclei. Our results indicate that
the quadrupole deformation of Kr isotopes will appear only above N = 58, as observed in Sr and Zr nuclei. The newly found 3- level at 1506.4 keV in 90Kr suggests the exsistence of a new region of increased octupole correlations, probably associated with the ν(d
5/2
h
11/2) pair of Δl = Δj = 3 orbitals.
Received: 18 September 2000 / Accepted: 18 October 2000 |
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| Keywords: | PACS 21 10 -k Properties of nuclei nuclear energy levels – 23 20 Lv Gamma transitions and level energies – 25 85 Ca Spontaneous fission – 27 60 +j 90 ≤ A≤ 149 |
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