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The ν9/2[404] orbital and the deformation in the A ∼ 100 region

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Abstract.

A T1/2 = 16(2)ns isomeric level, populated in the spontaneous fission of 248Cm, has been found in 101Zr at 941.8keV in a measurement of prompt γ-rays using the EUROGAM2 array. The level is interpreted as a K-isomer corresponding to the 9/2[404] neutron-hole excitation. The quadrupole moment, Q0 = 3.6(4)eb, deduced for the new band indicates a large deformation of β2 = 0.38(4), which is produced by a specific shape-coexistence mechanism. This is another observation of the ν9/2[404] orbital in the mass A ∼ 100 region, confirming the presence of the effect reported first in our previous work. The 9/2[404] neutron-hole excitation is also confirmed in the 97Sr nucleus and the deformation β2 = 0.44(2) is determined for this configuration. The properties of the 9/2[404] neutron orbital and its influence on the onset of deformation in the A ∼ 100 region are discussed.

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Authors and Affiliations

  1. Laboratoire de Physique Subatomique et de Cosmologie[:EORGNAME:], [:ORGNAME:]IN2P3-CNRS/Université Joseph Fourier, F-38026, Grenoble Cedex, France

    W. Urban, J. A. Pinston & J. Genevey

  2. Institute of Experimental Physics, Warsaw University, ul. Hoża 69, PL-00-681, Warszawa, Poland

    W. Urban, T. Rzaca-Urban & A. Złomaniec

  3. Institut Laue-Langevin, F-38042, Grenoble Cedex, France

    G. Simpson

  4. Schuster Laboratory, Department of Physics and Astronomy, University of Manchester, M13 9PL, Manchester, UK

    J. L. Durell, W. R. Phillips, A. G. Smith & B. J. Varley

  5. Argonne National Laboratory, 60439, Argonne, IL, USA

    I. Ahmad

  6. Institut de Recherches Subatomiques UMR7500, CNRS-IN2P3 et Université Louis Pasteur, F-67037, Strasbourg, France

    N. Schulz

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  1. W. Urban
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Correspondence to W. Urban.

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Urban, W., Pinston, J.A., Genevey, J. et al. The ν9/2[404] orbital and the deformation in the A ∼ 100 region. Eur. Phys. J. A 22, 241–252 (2004). https://doi.org/10.1140/epja/i2004-10037-5

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  • DOI: https://doi.org/10.1140/epja/i2004-10037-5

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