Zenith Angle and Momentum Spectrum of <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>μ</mi></math></span>-Mesons at Sea Level

Jacob L. Zar

doi:10.1103/PhysRev.83.761

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Zenith Angle and Momentum Spectrum of $μ$ -Mesons at Sea Level

Jacob L. Zar^*

Physics Department, W. S. College, New York University, New York, New York

^*This paper is part of a thesis submitted to the Graduate School of Arts and Science of New York University in partial fullfillment of the requirements for the Ph.D. degree.

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Phys. Rev. 83, 761 – Published 15 August, 1951

DOI: https://doi.org/10.1103/PhysRev.83.761

Abstract

The zenith angle dependence of the $μ$ -meson intensity at sea level has been measured for several values of momentum between 280 and 1080 Mev/c. Results were obtained by three methods: the coincidence, anticoincidence, and delayed coincidence methods, and it has been found that the shape of the zenith spectrum depended on which technique was used. The delayed coincidence method was capable of determining meson intensities in the presence of other types of penetrating particles. It suggests the existence of a considerable number of nonmesonic particles in the low energy region of the hard component. The lifetime of the meson was computed from its anomalous absorption in the atmosphere. It was found to be 2.2±0.3 microseconds.

References (19)

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[c1] M. Conversi, Phys. Rev. 76, 444, 849, 851 (1949)

[c2] Merkle, Goldwasser, and Brode, Phys. Rev. 79, 926 (1950)

[c3] G. T. Reynolds, Revs. Modern Phys. 21, 122 (1949)

[c4] W. L. Kraushaar, Phys. Rev. 76, 1045 (1949)

[c5] R. D. Rusk and A. Rosenbaum, Phys. Rev. 76, 1166 (1949)

[c6] Rossi, Sands, and Sard, Phys. Rev. 72, 120 (1947)

[c7] M. H. Shamos and M. G. Levy, Phys. Rev. 73, 1396 (1948)

[c8] B. Rossi, Revs. Modern Phys. 20, 537 (1948)

[c9] K. Greisen, Phys. Rev. 61, 212 (1942)

[c10] G. Cocconi and V. Tongiorgi, Phys. Rev. 70, 855 (1946)

[c11] W. Y. Chang and J. R. Winckler, Rev. Sci. Instr. 20, 276 (1949)

[c12] H. P. Koenig, Phys. Rev. 69, 590 (1946)

[c13] E. P. Gross, Range, Energy, Ionization Curves. Distributed by Princeton University (1947)

[c14] G. C. Wick, Nuovo cimento, Sec. 9 1, 310 (1943)

[c15] K. Greisen, Phys. Rev. 61, 212 (1942)

[c16] L. Janossy, Cosmic Rays (Oxford University Press, London, 1950)

[c17] J. R. Winckler and W. G. Stroud, Phys. Rev. 76, 1012 (1949)

[c18] W. G. Brombacher, National Committee of Aeronautics, Report No. 538 (1935)

[c19] M. Conversi, Phys. Rev. 79, 749 (1950)

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Zenith Angle and Momentum Spectrum of $μ$ -Mesons at Sea Level

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Zenith Angle and Momentum Spectrum of μ-Mesons at Sea Level

Abstract

References (19)

Zenith Angle and Momentum Spectrum of $μ$ -Mesons at Sea Level