First observation of the ν9/2[404] orbital in the a ∼ 100 mass region

W. Urban, J. A. Pinston, T. Rzaca-Urban, A. Złomaniec, G. Simpson, J. L. Durell, W. R. Phillips, A. G. Smith, B. J. Varley, I. Ahmad, N. Schulz

    Research output: Contribution to journalArticlepeer-review


    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. © Società Italiana di Fisica and Springer-Verlag 2003.
    Original languageEnglish
    Pages (from-to)11-15
    Number of pages4
    JournalEuropean Physical Journal A
    Issue number1
    Publication statusPublished - 2003


    • Nuclear energy level (isomer; of zirconium 99); Gamma ray; Nuclear energy level; Quadrupole moment (of zirconium 99)


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