Photoprotons from Magnesium

M. Elaine Toms; William E. Stephens

doi:10.1103/PhysRev.82.709

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Photoprotons from Magnesium

M. Elaine Toms and William E. Stephens

Department of Physics, University of Pennsylvania, Philadelphia, Pennsylvania

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Phys. Rev. 82, 709 – Published 1 June, 1951

DOI: https://doi.org/10.1103/PhysRev.82.709

Abstract

The distributions in energy and in angle of the protons ejected from magnesium by the bremsstrahlung x-rays of a 24-Mev betatron have been observed in nuclear emulsions. Both normal magnesium and enriched ${Mg}^{25}$ show a uniform angular distribution for all proton energies. The energy distribution of the protons from enriched ${Mg}^{25}$ is compared to the distributions calculated from an evaporation process using various energy level densities. Good agreement is obtained using the known ${Na}^{24}$ level densities. The integrated cross section of the ${Mg}^{25} (γ, p)$ reaction is determined as 0.056±0.03 Mev-barn.

References (23)

O. Hirzel and H. Wäffler, Helv. Phys. Acta 20, 373 (1947)
V. F. Weisskopf and D. H. Ewing, Phys. Rev. 57, 472, 935 (1940)
G. C. Baldwin and G. S. Klaiber, Phys. Rev. 73, 1156 (1948)
M. L. Perlman and G. Friedlander, Phys. Rev. 74, 422 (1948)
McElhinney, Hanson, Becker, Duffield, and Diven, Phys. Rev. 75, 542 (1949)
L. I. Schiff, Phys. Rev. 73, 1311 (1948)
M. Goldhaber and E. Teller, Phys. Rev. 74, 1046 (1948)
Toms, Halpern, and Stephens, Phys. Rev. 77, 753(A) (1950)
Curtis, Hornbostel, Lee, and Salant, Phys. Rev. 77, 290 (1950)
B. C. Diven and G. M. Almy, Phys. Rev. 80, 407 (1950)
E. D. Courant, Phys. Rev. 74, 1226(A) (1948) and private communications
P. Jensen, Naturwiss. 35, 190 (1948)
L. Wolfenstein, Phys. Rev. 78, 322(A) (1950)
J. S. Levinger and H. A. Bethe, Phys. Rev. 78, 115 (1950)
K. J. LeCouteur, Proc. Phys. Soc. (London) 63, 259 (1950)
Lattes, Fowler, and Cuer, Proc. Phys. Soc. (London) 59, 883 (1947)
J. S. Levinger, Nucleonics 6, No. 5, 64 (1950)
Johns, Katz, Douglas, and Haslam, Phys. Rev. 80, 1062 (1950)
A. K. Mann and J. Halpern, Phys. Rev. 81, 318 (1951)
Omitted endnote
D. E. Alburger and E. M. Hafner, Revs. Modern Phys. 22, 373 (1950)
G. A. Price and D. W. Kerst, Phys. Rev. 77, 806 (1950)
P. R. Byerly, Jr., and W. E. Stephens, Phys. Rev. 81, 473 (1951)

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

[c2] V. F. Weisskopf and D. H. Ewing, Phys. Rev. 57, 472, 935 (1940)

[c3] G. C. Baldwin and G. S. Klaiber, Phys. Rev. 73, 1156 (1948)

[c4] M. L. Perlman and G. Friedlander, Phys. Rev. 74, 422 (1948)

[c5] McElhinney, Hanson, Becker, Duffield, and Diven, Phys. Rev. 75, 542 (1949)

[c6] L. I. Schiff, Phys. Rev. 73, 1311 (1948)

[c7] M. Goldhaber and E. Teller, Phys. Rev. 74, 1046 (1948)

[c8] Toms, Halpern, and Stephens, Phys. Rev. 77, 753(A) (1950)

[c9] Curtis, Hornbostel, Lee, and Salant, Phys. Rev. 77, 290 (1950)

[c10] B. C. Diven and G. M. Almy, Phys. Rev. 80, 407 (1950)

[c11] E. D. Courant, Phys. Rev. 74, 1226(A) (1948) and private communications

[c12] P. Jensen, Naturwiss. 35, 190 (1948)

[c13] L. Wolfenstein, Phys. Rev. 78, 322(A) (1950)

[c14] J. S. Levinger and H. A. Bethe, Phys. Rev. 78, 115 (1950)

[c15] K. J. LeCouteur, Proc. Phys. Soc. (London) 63, 259 (1950)

[c16] Lattes, Fowler, and Cuer, Proc. Phys. Soc. (London) 59, 883 (1947)

[c17] J. S. Levinger, Nucleonics 6, No. 5, 64 (1950)

[c18] Johns, Katz, Douglas, and Haslam, Phys. Rev. 80, 1062 (1950)

[c19] A. K. Mann and J. Halpern, Phys. Rev. 81, 318 (1951)

[c20] Omitted endnote

[c21] D. E. Alburger and E. M. Hafner, Revs. Modern Phys. 22, 373 (1950)

[c22] G. A. Price and D. W. Kerst, Phys. Rev. 77, 806 (1950)

[c23] P. R. Byerly, Jr., and W. E. Stephens, Phys. Rev. 81, 473 (1951)

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Photoprotons from Magnesium

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