(<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>p</mi><mo>,</mo><mi> </mi><mi>pn</mi></math></span>) and (<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>p</mi><mo>,</mo><mi> </mi><mn>2</mn><mi>n</mi></math></span>) Cross Sections in Medium Weight Elements

Bernard L. Cohen; Eugene Newman

doi:10.1103/PhysRev.99.718

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( $p, pn$ ) and ( $p, 2 n$ ) Cross Sections in Medium Weight Elements

Bernard L. Cohen and Eugene Newman^*

Oak Ridge National Laboratory, Oak Ridge, Tennessee

^*Present address: U. S. Army.

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Phys. Rev. 99, 718 – Published 1 August, 1955

DOI: https://doi.org/10.1103/PhysRev.99.718

Abstract

The quantity $\frac{F_{p}}{F_{n}}$ , the ratio of probabilities for proton and neutron emission from nuclear reaction in the statistical region, is determined from measurements of ( $p, pn$ ) and ( $p, 2 n$ ) cross sections induced by 21.5-Mev protons bombarding nuclei of masses 48 to 71. The results are then compared with determinations of $\frac{F_{p}}{F_{n}}$ from reactions induced by lower-energy protons and 14-Mev neutrons. Both the absolute values of $\frac{F_{p}}{F_{n}}$ and their variation with bombarding energy are very difficult to explain by usual nuclear reaction theories.

References (25)

J. M. Blatt and V. F. Weisskopf, Theoretical Nuclear Physics (John Wiley and Sons, Inc., New York, 1952)
E. B. Paul and R. L. Clarke, Can. J. Physics 31, 267 (1953)
D. B. Beard, Phys. Rev. 94, 738 (1954) V. F. Weisskopf (private communication)
H. McManus and W. T. Sharp, Phys. Rev. 87, 188 (1952) R. M. Eisberg, 94, 739 (1954)
B. L. Cohen, Phys. Rev. 92, 1245 (1953)
Cohen, Newman, Charpie, and Handley, Phys. Rev. 94, 620 (1954) G. H. McCormick and B. L. Cohen, 96, 722 (1954)
L. R. Zumwalt, U. S. Atomic Energy Commission Report, MDDC 1346 (unpublished)
Omitted endnote
Cohen, Newman, and Handley, following paper [Phys. Rev. 99, 723 (1955)]
([11])
Blaser, Boehm, Marmier, and Peaslee, Helv. Phys. Acta 24, 3, 441 (1951) H. G. Blosser (to be published)
P. C. Gugelot, Phys. Rev. 81, 51 (1951)
Omitted endnote
Omitted endnote
Good, Kunz, and Moak, Phys. Rev. 94, 87 (1954)
R. M. Eisberg and G. Igo, Phys. Rev. 93, 1039 (1954) J. B. Reynolds and K. G. Standing, 95, 639 (1954)
P. C. Gugelot, Phys. Rev. 93, 425 (1954)
H. Hurwitz and H. A. Bethe, Phys. Rev. 81, 898 (1951)
S. N. Ghoshal, Phys. Rev. 80, 939 (1950)
Omitted endnote
V. F. Weisskopf (private communication)
Miller, Friedlander, and Markowitz, Phys. Rev. 98, 1197(A) (1955)
Brolley, Fowler, and Schlacks, Phys. Rev. 88, 618 (1953)
E. P. Wigner (private communication)
W. Meadows, Phys. Rev. 91, 885 (1953)

[c1] J. M. Blatt and V. F. Weisskopf, Theoretical Nuclear Physics (John Wiley and Sons, Inc., New York, 1952)

[c2] E. B. Paul and R. L. Clarke, Can. J. Physics 31, 267 (1953)

[c3] D. B. Beard, Phys. Rev. 94, 738 (1954) V. F. Weisskopf (private communication)

[c4] H. McManus and W. T. Sharp, Phys. Rev. 87, 188 (1952) R. M. Eisberg, 94, 739 (1954)

[c5] B. L. Cohen, Phys. Rev. 92, 1245 (1953)

[c6] Cohen, Newman, Charpie, and Handley, Phys. Rev. 94, 620 (1954) G. H. McCormick and B. L. Cohen, 96, 722 (1954)

[c7] L. R. Zumwalt, U. S. Atomic Energy Commission Report, MDDC 1346 (unpublished)

[c8] Omitted endnote

[c9] Cohen, Newman, and Handley, following paper [Phys. Rev. 99, 723 (1955)]

[c10] ([11])

[c11] Blaser, Boehm, Marmier, and Peaslee, Helv. Phys. Acta 24, 3, 441 (1951) H. G. Blosser (to be published)

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

[c13] Omitted endnote

[c14] Omitted endnote

[c15] Good, Kunz, and Moak, Phys. Rev. 94, 87 (1954)

[c16] R. M. Eisberg and G. Igo, Phys. Rev. 93, 1039 (1954) J. B. Reynolds and K. G. Standing, 95, 639 (1954)

[c17] P. C. Gugelot, Phys. Rev. 93, 425 (1954)

[c18] H. Hurwitz and H. A. Bethe, Phys. Rev. 81, 898 (1951)

[c19] S. N. Ghoshal, Phys. Rev. 80, 939 (1950)

[c20] Omitted endnote

[c21] V. F. Weisskopf (private communication)

[c22] Miller, Friedlander, and Markowitz, Phys. Rev. 98, 1197(A) (1955)

[c23] Brolley, Fowler, and Schlacks, Phys. Rev. 88, 618 (1953)

[c24] E. P. Wigner (private communication)

[c25] W. Meadows, Phys. Rev. 91, 885 (1953)

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(p, pn) and (p, 2n) Cross Sections in Medium Weight Elements

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( $p, pn$ ) and ( $p, 2 n$ ) Cross Sections in Medium Weight Elements