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

  • W. UrbanEmail author
  • J. A. Pinston
  • J. Genevey
  • T. Rzaca-Urban
  • A. Złomaniec
  • G. Simpson
  • J. L. Durell
  • W. R. Phillips
  • A. G. Smith
  • B. J. Varley
  • I. Ahmad
  • N. Schulz
Article

Abstract.

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.

Keywords

Elementary Particle Large Deformation Quadrupole Moment Spontaneous Fission Isomeric Level 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Società Italiana di Fisica and Springer-Verlag 2004

Authors and Affiliations

  • W. Urban
    • 1
    • 2
    Email author
  • J. A. Pinston
    • 1
  • J. Genevey
    • 1
  • T. Rzaca-Urban
    • 2
  • A. Złomaniec
    • 2
  • G. Simpson
    • 3
  • J. L. Durell
    • 4
  • W. R. Phillips
    • 4
  • A. G. Smith
    • 4
  • B. J. Varley
    • 4
  • I. Ahmad
    • 5
  • N. Schulz
    • 6
  1. 1.Laboratoire de Physique Subatomique et de Cosmologie[:EORGNAME:], [:ORGNAME:]IN2P3-CNRS/Université Joseph FourierGrenoble CedexFrance
  2. 2.Institute of Experimental PhysicsWarsaw UniversityWarszawaPoland
  3. 3.Institut Laue-LangevinGrenoble CedexFrance
  4. 4.Schuster Laboratory, Department of Physics and AstronomyUniversity of ManchesterManchesterUK
  5. 5.Argonne National LaboratoryArgonneUSA
  6. 6.Institut de Recherches Subatomiques UMR7500CNRS-IN2P3 et Université Louis PasteurStrasbourgFrance

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