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                       Phys. Rev. 120, 513–520 (1960)

                        [Issue 2 – 15 October 1960 ]

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Time Dependence of Resonantly Filtered Gamma Rays from Fe57

     F. J. Lynch, R. E. Holland, and M. Hamermesh
     Argonne National Laboratory, Argonne, Illinois

Received 6 June 1960

The time dependence of gamma rays emitted by the 14.4-kev state of Fe57 has
been studied by delayed-coincidence measurements between a 123-kev gamma
ray preceding formation of the state and the 14.4-kev gamma ray from the
state. When no filter was used, the number of gamma rays decreased
exponentially with the known half-life of 0.1 µsec. When a foil of Fe57
(which was resonant to 14.4-kev radiation) was used as a filter, the number
of gamma rays observed through the filter did not decrease exponentially.
Instead, the filter absorbed almost none of the gamma rays first emitted by
the 14.4-kev state; at later times the absorption increased. Data were
taken with three different thicknesses of absorber and with emission and
absorption peaks separated by 0 to 11 times the width of the resonance. The
energy separation resulted from the Doppler shift associated with a
constant velocity between source and absorber. These data were, for the
most part, in good accord with the prediction of a theory based on a
classical model for absorber and source. In particular, the results
verified the theoretical prediction that at certain times the intensity of
radiation observed would be greater with the filter than without it.

©1960 The American Physical Society

URL: http://link.aps.org/abstract/PR/v120/p513
DOI: 10.1103/PhysRev.120.513

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References

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  1. R. E. Holland, F. J. Lynch, G. J. Perlow, and S. S. Hanna, Phys. Rev.
     Letters 4, 181 (1960) .
  2. M. Hamermesh, Argonne National Laboratory Report ANL-6111, February,
     1960 (unpublished), p. 6.
  3. Nuclear Data Sheets, National Academy of Sciences, National Research
     Council, 1959 (U. S. Government Printing Office, Washington, D. C.).
  4. R. L. Mössbauer, Z. Physik 151, 124 (1958); J. P. Schiffer and W.
     Marshall, Phys. Rev. Letters 3, 556 (1959) ; R. V. Pound and J. A.
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  5. H. R. Lemmer, O. J. A. Segaert, and M. A. Grace, Proc. Phys. Soc.
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  6. J. A. Stratton, Electromagnetic Theory (McGraw-Hill Book Company,
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  7. S. S. Hanna, J. Heberle, C. Littlejohn, G. J. Perlow, R. S. Preston,
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  8. S. S. Hanna, J. Heberle, C. Littlejohn, G. J. Perlow, R. S. Preston,
     and D. H. Vincent, Phys. Rev. Letters 4, 28 (1960) .
  9. Omitted endnote.
 10. F. J. Lynch and R. E. Holland, Phys. Rev. 114, 825 (1959) ; R. E.
     Holland and F. J. Lynch, Phys. Rev. 113, 903 (1959) .

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