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The $\nu$9/2[404] orbital and the deformation in the A $\sim$ 100 region

Abstract : A T 1/2 = 16(2) ns isomeric level, populated in the spontaneous fission of $^{248}$Cm, has been found in $^{101}$Zr at 941.8 keV in a measurement of prompt $\gamma$-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 $\beta_2$=0.38(4), which is produced by a specific shape-coexistence mechanism. This is another observation of the $\nu$9/2[404] orbital in the mass A $\sim$ 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 $^{97}$Sr nucleus and the deformation $\beta_2$=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 $\sim^100 region are discussed.
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Submitted on : Tuesday, November 23, 2004 - 10:52:43 AM
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W. Urban, J.A. Pinston, J. Genevey, T. Rzaca-Urban, A. Zlomaniec, et al.. The $\nu$9/2[404] orbital and the deformation in the A $\sim$ 100 region. European Physical Journal A, EDP Sciences, 2004, 22, pp.241-252. ⟨10.1140/epja/i2004-10037-5⟩. ⟨in2p3-00023332⟩



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