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Kinetics of Stimulated Emission in Neutron-Pumped Nuclear Laser Systems

  • G. C. Baldwint

Abstract

Plane wave solution of kinetic equations for a Mössbauer transition graser, pumped by an instantaneous neutron burst, shows low group velocity and reduced nonexponential amplification prolonged by superradiance when account is taken of time-dependence (“inertia”) in the resonance cross section and of finite neutron moderation time and indicates that directly pumped grasers, assuming that radiation damage and isomer ratios do not preclude their functioning, should employ resonance capture and recoilless transitions between excited states.

Keywords

Isomer Ratio Plane Wave Solution Resonance Cross Section Neutron Burst Borrmann Effect 
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References

  1. 1.
    B. V. Chirikov, Sov. Phys.-JETP 17, 1355–59 (1963).Google Scholar
  2. 2.
    V. I. Vorontsov and V. I. Vysotskii, Sov. Phys.-JETP 39, 748–751 (1974).ADSGoogle Scholar
  3. 3.
    G. T. Trammel and J. P. Hannon, Bull. Amer. Phys. Soc. 20, 637 (1975).Google Scholar
  4. 4.
    F. A. Hopf, P. Meystre, M. O. Scully and John F. Seely, Phys. Rev. Letters 35, 511–512 (1975).ADSCrossRefGoogle Scholar
  5. 5.
    We suggest the term “inertia of response” as an unalliterative alternative to “lethargy”, which is already in use; it denotes the logarithm of the reciprocal of neutron energy and, should grasers become available, would lead to confusion.Google Scholar
  6. See S. Glasstone and M. C. Edlund, The Elements of Nuclear Reactor Theory, D. Van Nostrand, New York, Ch. 6, 1952.Google Scholar
  7. 6.
    E. J. Lynch, R. E. Holland and M. Hammermesh, Phys. Rev. 120, 513–520 (1960).ADSCrossRefGoogle Scholar
  8. 7.
    N. G. Basov et al, Sov. Phys.-JETP 23 16–22 (1966).ADSGoogle Scholar
  9. 8.
    G. C. Baldwin, J. P. Neissel, J. H. Terhune and L. Tonks, Trans. Amer. Nucl. Soc. 6, 178 (1963)Google Scholar
  10. W. Vali and V. Vali, Proc. IEEE 51, 182 (1963).CrossRefGoogle Scholar
  11. 9.
    G. C. Baldwin and R. V. Khokhlov, Physics Today 28, 32–39 (1973).CrossRefGoogle Scholar
  12. 10.
    Y. A. Ilfinskii and R. V. Khokhlov, Sov. Phys.-JETP 40, 819–820 (1975)Google Scholar
  13. V. A. Namiot, Sov. Phys.-JETP Letters 18, 216–219 (1975).ADSGoogle Scholar
  14. 11.
    V. I. Gol’danskii, S. V. Karyagin and V. A. Namiot, Sov. Phys.- JETP Letters 19, 324–326 (1974)ADSGoogle Scholar
  15. Yu. Kagan, Sov. Phys.-JETP Letters 19, 373–374 (1974).ADSGoogle Scholar
  16. 12.
    V. I. Gol’danskii and Yu. Kagan, Sov. Phys.-Uspekhi 16, 563–565 (1974)ADSCrossRefGoogle Scholar
  17. V. I. Gol’danskii and Yu. Kagan, Sov. Phys.-JETP 37, 49–52 (1973)ADSGoogle Scholar
  18. J. C. Solem, private communication; C. D. Bowman, private communication.Google Scholar
  19. 13.
    G. Borrmann, Z. Phys. 42, 157 (1942); 127, 297 (1950).Google Scholar
  20. 14.
    G. C. Baldwin, J. P. Neissel and L. Tonks, Proc. IEEE 51, 1247–1248 (1963)CrossRefGoogle Scholar
  21. Y. Kagan, Sov. Phys.-JETP Letters 20, 11–12 (1974).ADSGoogle Scholar
  22. 15.
    G. C. Baldwin, J. W. Pettit and H. R. Schwenn, Proc. 1975 Int. Conf. Mössbauer Spectr., Krakow, Vol. II, 413–428 (1975).Google Scholar
  23. 16.
    N. R. Williams, The Slowing Down and Thermalization of Neutrons John Wiley & Sons, New York 339 (1966).Google Scholar
  24. 17.
    Consideration of the dipole selection rules for capture gamma radiation leading to formation of isomeric states (J. R. Huizenga and Vandenbosch, Phys. Rev. 120, 1305–1312 (1960) suggests that the isomer ratio is not likely to have values greatly different from 1/2 for isomers with small spin differences, but can be large when the spin difference is large and one state has spin near that of the capture state. The latter case is more likely to occur in long-lived transitions, which, as they require line narrowing, are unsuitable for direct excitation.Google Scholar
  25. 18.
    For simplicity in considering general cases we have taken the statistical weight factor to be unity. Particular cases will therefore give somewhat different numerical results, but the qualitative features we wish to discuss are not critically dependent upon this ratio.Google Scholar
  26. 19.
    I am indebted to B. R. Suydam for assistance in finding this solution.Google Scholar
  27. 20.
    G. C. Baldwin and J. H. Terhune, Phys. Rev. Letters 14, 589–591 (1965).MathSciNetADSCrossRefGoogle Scholar
  28. 21.
    The total intensity of radiation emitted into this direction can be obtained by integrating the square of this quantity over the entire length of the graser body.Google Scholar
  29. 22.
    But not of a low absorption directionally-selective waveguide; i.e., one using the Borrmann effect (Ref. 12,13)Google Scholar

Copyright information

© Plenum Press, New York 1977

Authors and Affiliations

  • G. C. Baldwint
    • 1
  1. 1.Los Alamos Scientific LaboratoryUniversity of CaliforniaLos AlamosUSA

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