<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>μ</mi></math></span>-Mesonic X Rays in the Iron Region

C. Scott Johnson; E. P. Hincks; H. L. Anderson

doi:10.1103/PhysRev.125.2102

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$μ$ -Mesonic X Rays in the Iron Region

C. Scott Johnson, E. P. Hincks^*, and H. L. Anderson

The Enrico Fermi Institute for Nuclear Studies, The University of Chicago, Chicago, Illinois

^*On leave from Atomic Energy of Canada, Ltd. Present address: Division of Pure Physics, National Research Council of Canada, Ottawa, Ontario, Canada.

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Phys. Rev. 125, 2102 – Published 15 March, 1962

DOI: https://doi.org/10.1103/PhysRev.125.2102

Abstract

The energies and intensities of the $μ$ -mesonic $K$ x rays emitted as muons cascade down through the Bohr orbits of Al, K, Ca, Ti, Cr, Mn, Fe, Co, Ni, Cu, and Zn have been measured as well as the time distribution of $K_{α}$ x rays from Fe using a NaI spectrometer. This experiment was carried out in an effort to see if some anomaly in the emission of the x rays could help explain the anomalously high muon decay rates reported by Yovanovitch. Such an effect could be explained if for some reason the muons were delayed in reaching the $1 s$ atomic level in a time short compared with their lifetime for capture and decay. No effects of magnitude great enough to explain the decay rate anomaly were discovered. The $K_{α}$ x-ray energies were found to be somewhat higher than those calculated by Ford and Wills. The x-ray yields from the elements studied were found to be close to 100%. From the time distribution of $K_{α}$ x rays emitted by Fe, an upper limit of 4× $10^{- 9}$ sec was set for the mean life of the muons in reaching the $1 s$ level.

References (14)

D. D. Yovanovitch, Phys. Rev. 117, 1580 (1960)
V. L. Fitch and J. Rainwater, Phys. Rev. 92, 789 (1953)
M. B. Stearns and M. Stearns, Phys. Rev. 105, 1573 (1957)
K. W. Ford and J. G. Wills, Los Alamos Scientific Laboratory Report LAMS—2387, 1960 (unpublished)
R. Gabriel and A. M. Segar, Nuclear Instr. and Methods (to be published)
W. F. Miller and W. J. Snow, Argonne National Laboratory Report ANL-6318, 1961 (unpublished) Rev. Sci. Instr. 31, 39 (1960)
J. A. Wheeler, Revs. Modern Phys. 21, 133 (1949)
R. Hofstadter, Ann. Rev. Nuclear Sci. 7, 231 (1957)
L. N. Cooper and E. M. Henley, Phys. Rev. 92, 801 (1953)
B. Hahn, D. G. Ravenhall, and R. Hofstadter, Phys. Rev. 101, 1131 (1956) H. Crannell, R. Helm, H. Kendall, J. Oeser, and M. Yearian, ibid. 121, 283 (1961)
K. Siegbahn, Beta- and Gamma-Ray Spectroscopy, edited by K. Siegbahn Publishers, Inc., New York, 1955), Appendix I, p. 857
J. L. Lathrop, R. A. Lundy, V. L. Telegdi, and R. Winston, Phys. Rev. Letters 7, 147 (1961)
Y. Eisenberg and D. Kessler, Nuovo cimento 19, 1195 (1961)
R. S. Weaver and R. E. Bell, Nuclear Instr. and Methods 9, 149 (1960)

[c1] D. D. Yovanovitch, Phys. Rev. 117, 1580 (1960)

[c2] V. L. Fitch and J. Rainwater, Phys. Rev. 92, 789 (1953)

[c3] M. B. Stearns and M. Stearns, Phys. Rev. 105, 1573 (1957)

[c4] K. W. Ford and J. G. Wills, Los Alamos Scientific Laboratory Report LAMS—2387, 1960 (unpublished)

[c5] R. Gabriel and A. M. Segar, Nuclear Instr. and Methods (to be published)

[c6] W. F. Miller and W. J. Snow, Argonne National Laboratory Report ANL-6318, 1961 (unpublished) Rev. Sci. Instr. 31, 39 (1960)

[c7] J. A. Wheeler, Revs. Modern Phys. 21, 133 (1949)

[c8] R. Hofstadter, Ann. Rev. Nuclear Sci. 7, 231 (1957)

[c9] L. N. Cooper and E. M. Henley, Phys. Rev. 92, 801 (1953)

[c10] B. Hahn, D. G. Ravenhall, and R. Hofstadter, Phys. Rev. 101, 1131 (1956) H. Crannell, R. Helm, H. Kendall, J. Oeser, and M. Yearian, ibid. 121, 283 (1961)

[c11] K. Siegbahn, Beta- and Gamma-Ray Spectroscopy, edited by K. Siegbahn Publishers, Inc., New York, 1955), Appendix I, p. 857

[c12] J. L. Lathrop, R. A. Lundy, V. L. Telegdi, and R. Winston, Phys. Rev. Letters 7, 147 (1961)

[c13] Y. Eisenberg and D. Kessler, Nuovo cimento 19, 1195 (1961)

[c14] R. S. Weaver and R. E. Bell, Nuclear Instr. and Methods 9, 149 (1960)

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μ-Mesonic X Rays in the Iron Region

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$μ$ -Mesonic X Rays in the Iron Region