Abstract:
A new band, populated by the spontaneous fission of 248Cm and studied by means of prompt γ-ray spectroscopy using the EUROGAM2 array, was observed in 99Zr. The 1038.8 keV band head with a half-life T 1/2 = 54(10) ns is interpreted as a K-isomer, corresponding to the 9/2[404] neutron-hole excitation. It is the first observation of this orbital in the mass A ∼ 100 region. The quadrupole moment, Q 0 = 3.9(3) eb deduced for the new band indicates a large deformation of β = 0.41, which is produced by a specific shape-coexistence mechanism, known in other regions and now found in the A ∼ 100 nuclei.
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Received: 11 September 2002 / Accepted: 31 October 2002 / Published online: 17 January 2003
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Communicated by D. Schwalm
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Urban, W., Pinston, J., Rzaca-Urban, T. et al. First observation of the ν9/2[404] orbital in the A ∼ 100 mass region. Eur Phys J A 16, 11–15 (2003). https://doi.org/10.1140/epja/i2002-10104-y
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DOI: https://doi.org/10.1140/epja/i2002-10104-y