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Coulomb-Recoil-Implantation Mössbauer Experiments with Ge73

Gordon Czjzek*, J. L. C. Ford, Jr., John C. Love†, Felix E. Obenshain, and Horst H. F. Wegener‡

  • Oak Ridge National Laboratory, Oak Ridge, Tennessee

  • *On leave 1967-1968, Kernforschungszentrum, Karlsruhe, Germany.
  • †Oak Ridge Graduate Fellow from Ohio State University under appointment with Oak Ridge Associated Universities.
  • ‡Permanent address: Universitat Erlangen-Nurnberg, Germany.
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Phys. Rev. 174, 331 – Published 10 October, 1968

DOI: https://doi.org/10.1103/PhysRev.174.331

Abstract

The 67.03-keV state of Ge73 has been populated by Coulomb excitation and the recoiling excited nuclei implanted into Cr, Fe, and Cu backings. Nuclear and solid-state properties of Ge73 have been determined by studying the de-excitation γ rays by Mössbauer techniques. The present measurements yield a lifetime of (2.68±0.14)×10−9 sec, and favor a spin of 72 for the 67.03-keV excited state. The measured isomer shift between pure germanium and GeO2 is + 1.0±0.1 mm/sec, and electron densities calculated for these two cases imply that the radius of the excited state is larger than that of the ground state, and ΔRR=+0.9×10−3 in reasonable agreement with calculations based on the pairing-plus-quadrupole model. To calculate the recoilless fraction f of an impurity atom, a simple model with spring forces between nearest neighbors is introduced. In each case the effective spring constant for the impurity, as derived from the observed f value, is weaker than that of the host lattice. A remarkable difference was found between f values for tetragonal and hexagonal GeO2, namely f(tetr)∼5f(hex).

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Phys. Rev. 174, 331– Published 10 October, 1968
  • Received 5 April 1968

© 1968 American Physical Society

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