Anomalies in Yield Curves over the 992-kev <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="normal">Al</mi></mrow><mrow><mn>27</mn></mrow></msup></mrow><mo>(</mo><mi>p</mi><mo>,</mo><mi> </mi><mi>γ</mi><mo>)</mo><mrow><msup><mrow><mi mathvariant="normal">Si</mi></mrow><mrow><mn>28</mn></mrow></msup></mrow></math></span> Resonance

W. L. Walters; D. G. Costello; J. G. Skofronick; D. W. Palmer; W. E. Kane; R. G. Herb

doi:10.1103/PhysRev.125.2012

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Anomalies in Yield Curves over the 992-kev ${Al}^{27} (p, γ) {Si}^{28}$ Resonance

W. L. Walters^*, D. G. Costello, J. G. Skofronick, D. W. Palmer, W. E. Kane, and R. G. Herb

University of Wisconsin, Madison, Wisconsin

^*Present address: Department of Physics, University of Wisconsin—Milwaukee, Milwaukee, Wisconsin.

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Phys. Rev. 125, 2012 – Published 15 March, 1962

DOI: https://doi.org/10.1103/PhysRev.125.2012

Abstract

Gamma-ray yields from the ${Al}^{27} (p, γ) {Si}^{28}$ reaction have been investigated at the 992-kev resonance using $H_{1}^{+}$ and $H_{2}^{+}$ ions on thick and thin aluminum targets. Thick-target yield curves due to proton bombardment show a prominent peak a few hundred ev above the resonance energy. This structure was predicted by Lewis and is caused by the discrete nature of the energy losses suffered by the protons as they penetrate the target. A Monte Carlo calculation gives good agreement with the general form of the experimental curve. Diatomic ion thick-target yield curves are more complex in structure than those found with protons. The largest effect here is due to Coulomb repulsion between the two protons as they pass through the target. Internal kinetic energy of the ions makes a contribution to the structure. The Lewis effect also appears to contribute. Some information regarding the relative populations of the vibrational levels of the ions was obtained from $H_{2}^{+}$ ion thin-target yield curves.

References (23)

W. L. Walters, D. G. Costello, J. G. Skofronick, D. W. Palmer, W. E. Kane, and R. G. Herb, Phys. Rev. Letters 7, 284 (1961)
H. W. Lewis, Phys. Rev. 125, 937 (1962)
Omitted endnote
P. F. Dahl, D. G. Costello, and W. L. Walters, Nuclear Phys. 21, 106 (1960)
Jerry B. Marion, Revs. Modern Phys. 33, 139 (1961)
W. L. Walters, Ph.D. thesis, University of Wisconsin, Madison, Wisconsin, 1961 (unpublished)
Omitted endnote
R. D. Evans, The Atomic Nucleus (McGraw-Hill Book Company, Inc., New York, 1955), Chaps. 18, 22
F. Bloch, Z. Physik 81, 363 (1933)
H. E. Gove, in Nuclear Reactions, edited by P. M. Endt and M. Demeur (North-Holland Publishing Company, Amsterdam, 1959), Vol. I, p. 293
H. Bichsel and E. A. Uehling, Phys. Rev. 119, 1670 (1960)
Omitted endnote
D. F. Herring, R. A. Douglas, E. A. Silverstein, and R. Chiba, Phys. Rev. 100, 1239 (1955)
S. L. Andersen, K. Gjötterud, T. Holtebekk, and O. Lönsjö, Nuclear Phys. 7, 384 (1958)
R. O. Bondelid and C. A. Kennedy, Naval Research Laboratory Report NRL-5083 Washington, D. C., 1958 (unpublished)
P. F. Dahl, Ph.D. thesis, University of Wisconsin, Madison, Wisconsin, 1960 (unpublished)
E. J. Bernet, R. G. Herb, and D. B. Parkinson, Phys. Rev. 54, 398 (1938)
R. Serber, Phys. Rev. 72, 1008 (1947)
G. Herzberg, Molecular Spectra and Molecular Structure (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1950), p. 193ff
S. Cohen, J. R. Hiskes, and R. J. Riddell, Jr., University of California Radiation Laboratory Report UCRL-8871, 1959 (unpublished)
p. 123 of [19]
Omitted endnote
J. R. Hiskes (private communications, 1961)

[c1] W. L. Walters, D. G. Costello, J. G. Skofronick, D. W. Palmer, W. E. Kane, and R. G. Herb, Phys. Rev. Letters 7, 284 (1961)

[c2] H. W. Lewis, Phys. Rev. 125, 937 (1962)

[c3] Omitted endnote

[c4] P. F. Dahl, D. G. Costello, and W. L. Walters, Nuclear Phys. 21, 106 (1960)

[c5] Jerry B. Marion, Revs. Modern Phys. 33, 139 (1961)

[c6] W. L. Walters, Ph.D. thesis, University of Wisconsin, Madison, Wisconsin, 1961 (unpublished)

[c7] Omitted endnote

[c8] R. D. Evans, The Atomic Nucleus (McGraw-Hill Book Company, Inc., New York, 1955), Chaps. 18, 22

[c9] F. Bloch, Z. Physik 81, 363 (1933)

[c10] H. E. Gove, in Nuclear Reactions, edited by P. M. Endt and M. Demeur (North-Holland Publishing Company, Amsterdam, 1959), Vol. I, p. 293

[c11] H. Bichsel and E. A. Uehling, Phys. Rev. 119, 1670 (1960)

[c12] Omitted endnote

[c13] D. F. Herring, R. A. Douglas, E. A. Silverstein, and R. Chiba, Phys. Rev. 100, 1239 (1955)

[c14] S. L. Andersen, K. Gjötterud, T. Holtebekk, and O. Lönsjö, Nuclear Phys. 7, 384 (1958)

[c15] R. O. Bondelid and C. A. Kennedy, Naval Research Laboratory Report NRL-5083 Washington, D. C., 1958 (unpublished)

[c16] P. F. Dahl, Ph.D. thesis, University of Wisconsin, Madison, Wisconsin, 1960 (unpublished)

[c17] E. J. Bernet, R. G. Herb, and D. B. Parkinson, Phys. Rev. 54, 398 (1938)

[c18] R. Serber, Phys. Rev. 72, 1008 (1947)

[c19] G. Herzberg, Molecular Spectra and Molecular Structure (D. Van Nostrand Company, Inc., Princeton, New Jersey, 1950), p. 193ff

[c20] S. Cohen, J. R. Hiskes, and R. J. Riddell, Jr., University of California Radiation Laboratory Report UCRL-8871, 1959 (unpublished)

[c21] p. 123 of [19]

[c22] Omitted endnote

[c23] J. R. Hiskes (private communications, 1961)

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Anomalies in Yield Curves over the 992-kev ${Al}^{27} (p, γ) {Si}^{28}$ Resonance

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Anomalies in Yield Curves over the 992-kev Al27(p, γ)Si28 Resonance

Abstract

References (23)

Anomalies in Yield Curves over the 992-kev ${Al}^{27} (p, γ) {Si}^{28}$ Resonance