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

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

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    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. © Società Italiana di Fisica/Springer-Verlag 2004.
    Original languageEnglish
    Pages (from-to)241-252
    Number of pages11
    JournalEuropean Physical Journal A
    Issue number2
    Publication statusPublished - Nov 2004


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