(<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>γ</mi><mo>,</mo><mi> </mi><mi>p</mi></math></span>) Reaction in Argon-40

B. M. Spicer

doi:10.1103/PhysRev.100.791

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( $γ, p$ ) Reaction in Argon-40

B. M. Spicer^*

Physics Research Laboratory, University of Illinois, Champaign, Illinois

^*Fulbright Fellow, on leave from the Physics Department, University of Melbourne, Melbourne, Australia.

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Phys. Rev. 100, 791 – Published 1 November, 1955

DOI: https://doi.org/10.1103/PhysRev.100.791

Abstract

The energy distribution and angular distribution of photoprotons from argon irradiated with 22.5-Mev bremsstrahlung have been measured. The yield of protons was found to be 6.6× $10^{5}$ protons per mole per r, in good agreement with Saskatoon results. The angular distribution of protons indicated that the absorption was predominantly electric dipole, as expected. The energy distribution peaked at 2.6 Mev, and, from its characteristics, it was inferred that the Coulomb barrier for protons plus ${Cl}^{39}$ was only about 2.5 Mev, and that the level density in ${Cl}^{39}$ increased with energy approximately as $\exp (E)$ . These result are discussed in terms of the compound nucleus model and the direct photoeffect model.

References (14)

O. Hirzel and H. Waffler, Helv. Phys. Acta 20, 373 (1947)
E. D. Courant, Phys. Rev. 82, 703 (1951)
D. H. Wilkinson and J. H. Carver, Phys. Rev. 83, 466 (1951)
McPherson, Pederson, and Katz, Can. J. Phys. 32, 593 (1954)
B. M. Spicer, Phys. Rev. 99, 33 (1955)
J. J. Wilkins, Atomic Energy Research Establishment, Harwell G/R 664 (1951)
B. C. Diven and G. M. Almy, Phys. Rev. 80, 407 (1950)
Feshbach, Shapiro, and Weisskopf, Nuclear Development Association Report NYO 3077, 1953 (unpublished)
H. A. Bethe, Revs. Modern Phys. 9, 69 (1937)
J. M. C. Scott, Phil. Mag. 45, 441 (1954)
D. H. Wilkinson, Proceedings of the Photonuclear Conference, Philadelphia, May, 1954(unpublished)
P. C. Gugelot, Phys. Rev. 81, 51 (1951)
Miller, Friedlander, and Markowitz, Phys. Rev. 98, 1197(A) (1955)
B. L. Cohen and E. Newman, Phys. Rev. 99, 718 (1955) private communication

[c1] O. Hirzel and H. Waffler, Helv. Phys. Acta 20, 373 (1947)

[c2] E. D. Courant, Phys. Rev. 82, 703 (1951)

[c3] D. H. Wilkinson and J. H. Carver, Phys. Rev. 83, 466 (1951)

[c4] McPherson, Pederson, and Katz, Can. J. Phys. 32, 593 (1954)

[c5] B. M. Spicer, Phys. Rev. 99, 33 (1955)

[c6] J. J. Wilkins, Atomic Energy Research Establishment, Harwell G/R 664 (1951)

[c7] B. C. Diven and G. M. Almy, Phys. Rev. 80, 407 (1950)

[c8] Feshbach, Shapiro, and Weisskopf, Nuclear Development Association Report NYO 3077, 1953 (unpublished)

[c9] H. A. Bethe, Revs. Modern Phys. 9, 69 (1937)

[c10] J. M. C. Scott, Phil. Mag. 45, 441 (1954)

[c11] D. H. Wilkinson, Proceedings of the Photonuclear Conference, Philadelphia, May, 1954(unpublished)

[c12] P. C. Gugelot, Phys. Rev. 81, 51 (1951)

[c13] Miller, Friedlander, and Markowitz, Phys. Rev. 98, 1197(A) (1955)

[c14] B. L. Cohen and E. Newman, Phys. Rev. 99, 718 (1955) private communication

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( $γ, p$ ) Reaction in Argon-40

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(γ, p) Reaction in Argon-40

Abstract

References (14)

( $γ, p$ ) Reaction in Argon-40