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The ν9/2 orbital and the deformation in the A ∼ 100 region
W. Urban1,2*, J. A. Pinston1, J. Genevey1, T. Rzaca-Urban2, A. Złomaniec2, G. Simpson3, J. L. Durell4, W. R. Phillips4, A. G. Smith4, B. J. Varley4, I. Ahmad5 and N. Schulz6
Laboratoire de Physique Subatomique et de Cosmologie[:EORGNAME:], [:ORGNAME:]IN2P3-CNRS/Université Joseph Fourier, F-38026, Grenoble Cedex, France
2 Institute of Experimental Physics, Warsaw University, ul. Hoża 69, PL-00-681, Warszawa, Poland
3 Institut Laue-Langevin, F-38042, Grenoble Cedex, France
4 Schuster Laboratory, Department of Physics and Astronomy, University of Manchester, M13 9PL, Manchester, UK
5 Argonne National Laboratory, 60439, Argonne, IL, USA
6 Institut de Recherches Subatomiques UMR7500, CNRS-IN2P3 et Université Louis Pasteur, F-67037, Strasbourg, France
* e-mail: firstname.lastname@example.org
Accepted: 2 June 2004
Published online: 9 November 2004
A T 1/2 = 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 neutron-hole excitation. The quadrupole moment, Q 0 = 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 orbital in the mass A ∼ 100 region, confirming the presence of the effect reported first in our previous work. The 9/2 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 neutron orbital and its influence on the onset of deformation in the A ∼ 100 region are discussed.
© Società Italiana di Fisica and Springer-Verlag, 2004