<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>Z</mi></math></span>-Dependence of Bremsstrahlung

W. C. Barber; A. I. Berman; K. L. Brown; W. D. George

doi:10.1103/PhysRev.99.59

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$Z$ -Dependence of Bremsstrahlung

W. C. Barber, A. I. Berman^*, K. L. Brown, and W. D. George

High-Energy Physics Laboratory, Stanford University, Stanford, California

^*Now with Pratt and Whitney, Hartford, Connecticut.

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Phys. Rev. 99, 59 – Published 1 July, 1955

DOI: https://doi.org/10.1103/PhysRev.99.59

Abstract

The relative amounts of bremsstrahlung produced by the elements Cu, Ta, Pb, and U for incident electrons of energy 24 and 34 Mev were measured by using the ${Cu}^{63} (γ, n) {Cu}^{62}$ reaction as the photon detector. Because of the shape of the cross-section function, photons were detected in a comparatively narrow energy band centered at 17.5 Mev. The electron beam was monitored by a Faraday cup placed immediately behind the radiator and detector foils. Corrections were applied to account for ionization and radiation losses of the electrons, and for pair production and Compton losses of the photons.

The experimentally-determined "thin-target" cross sections relative to copper for Ta, Pb, and U, respectively, were 5.681±0.13, 6.959±0.16, and 8.221±0.19 per atom, at 24 Mev; and 5.583±0.08, 6.770±0.09, and 8.172±0.12 at 34 Mev. These values are from five to thirteen percent lower than the corresponding ratios calculated from the Bethe-Heitler theory (including screening and radiation produced in collision with atomic electrons). The results are consistent with a deviation from theory of (1.54±0.2)× $10^{- 3}$ $Z^{2}$ percent for 24-Mev electrons, and (1.38±0.14)× $10^{- 3}$ $Z^{2}$ percent for 34-Mev electrons.

References (14)

H. A. Bethe and W. Heitler, Proc. Roy. Soc. (London) A146, 83 (1934)
J. W. Dewire and L. A. Beach, Phys. Rev. 83, 476 (1951)
Powell, Hartsough, and Hill, Phys. Rev. 81, 213 (1951)
L. H. Lanzl and A. O. Hansen, Phys. Rev. 83, 959 (1951)
C. D. Curtis, Phys. Rev. 89, 123 (1953)
A. I. Berman, Phys. Rev. 90, 210 (1953)
C. R. Emigh, Phys. Rev. 86, 1028 (1952)
R. L. Walker, Phys. Rev. 76, 527 (1949) ibid.76, 1440 (1949)
J. L. Lawson, Phys. Rev. 75, 433 (1949)
H. A. Bethe and L. C. Maximon, Phys. Rev. 93, 768 (1954)
Davies, Bethe, and Maximon, Phys. Rev. 93, 788 (1954)
A. I. Berman and K. L. Brown, Phys. Rev. 96, 83 (1954)
Barber, George, and Reagan, Phys. Rev. 98, 73 (1955)
J. A. Wheeler and W. E. Lamb, Phys. Rev. 55, 858 (1939)

[c1] H. A. Bethe and W. Heitler, Proc. Roy. Soc. (London) A146, 83 (1934)

[c2] J. W. Dewire and L. A. Beach, Phys. Rev. 83, 476 (1951)

[c3] Powell, Hartsough, and Hill, Phys. Rev. 81, 213 (1951)

[c4] L. H. Lanzl and A. O. Hansen, Phys. Rev. 83, 959 (1951)

[c5] C. D. Curtis, Phys. Rev. 89, 123 (1953)

[c6] A. I. Berman, Phys. Rev. 90, 210 (1953)

[c7] C. R. Emigh, Phys. Rev. 86, 1028 (1952)

[c8] R. L. Walker, Phys. Rev. 76, 527 (1949) ibid.76, 1440 (1949)

[c9] J. L. Lawson, Phys. Rev. 75, 433 (1949)

[c10] H. A. Bethe and L. C. Maximon, Phys. Rev. 93, 768 (1954)

[c11] Davies, Bethe, and Maximon, Phys. Rev. 93, 788 (1954)

[c12] A. I. Berman and K. L. Brown, Phys. Rev. 96, 83 (1954)

[c13] Barber, George, and Reagan, Phys. Rev. 98, 73 (1955)

[c14] J. A. Wheeler and W. E. Lamb, Phys. Rev. 55, 858 (1939)

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$Z$ -Dependence of Bremsstrahlung

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Z-Dependence of Bremsstrahlung

Abstract

References (14)

$Z$ -Dependence of Bremsstrahlung