Reaction Mechanisms in (<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>p</mi><mo>,</mo><mrow><msup><mrow><mi>p</mi></mrow><mrow><mo>′</mo></mrow></msup></mrow></math></span>) Reactions Exciting the High-Energy Continuum

B. L. Cohen; G. R. Rao; J. H. Degnan; K. C. Chan

doi:10.1103/PhysRevC.7.331

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Reaction Mechanisms in ( $p, p^{'}$ ) Reactions Exciting the High-Energy Continuum

B. L. Cohen, G. R. Rao, J. H. Degnan, and K. C. Chan

University of Pittsburgh, Pittsburgh, Pennsylvania 15213

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Phys. Rev. C 7, 331 – Published 1 January, 1973

DOI: https://doi.org/10.1103/PhysRevC.7.331

Abstract

The reaction mechanism in ( $p, p^{'}$ ) reactions exciting states above about 3-MeV excitation energy has been studied in several nuclei in which ordinary compound-nucleus contributions have been shown to be unimportant. Up to 7 MeV in ${}^{64}{Ni}$ and ${}^{124}{Sn}$ , there is strong structure in the energy spectra of emitted protons which is closely correlated with the structure in ( $d, d^{'}$ ) reactions; this indicates that direct reactions exciting collective states are the dominant mechanism here. Distorted-wave Born-approximation calculations are used to show that there is an additional mechanism contributing low-energy protons. This mechanism is believed to be isospin-conserving reactions via $T_{>}$ states, but it is shown that the decay of these states cannot be treated with statistical theory in the Sn region. A reason for this is proposed, and supporting evidence is presented. The applicability of pre-equilibrium calculations to ( $p, p^{'}$ ) reactions is discussed.

References (20)

B. L. Cohen, G. R. Rao, C. L. Fink, J. C. Van der Weerd, and J. A. Penkrot, Phys. Rev. Letters 25, 306 (1970)
B. L. Cohen, J. H. Degnan, C. L. Fink, G. R. Rao, and R. Balasubramanian, Phys. Rev. Letters 26, 23 (1971)
G. R. Rao, R. Balasubramanian, B. L. Cohen, C. L. Fink, and J. H. Degnan, Phys. Rev. C 4, 1855 (1971)
B. L. Cohen and A. G. Rubin, Phys. Rev. 111, 1568 (1958) W. T. Pinkston and G. R. Satchler, Nucl. Phys. 27, 270 (1961) N. Austern, Direct Nuclear Reaction Theories (Wiley-Interscience, New York, 1970)
J. J. Griffin, Phys. Rev. Letters 17, 478 (1966) M. Blann, ibid. 21, 1357 (1968) C. K. Cline and M. Blann, Nucl. Phys. A172, 225 (1971)
C. H. Holbrow.and H. H. Barschall, Nucl. Phys. 42, 264 (1963) R. M. Wood, R. R. Borchers, and H. H. Barschall, ibid. 71, 529 (1965) R. R. Borchers, R. M. Wood, and C. H. Holbrow, ibid. 88, 689 (1966) S. M. Grimes, J. D. Anderson, B. A. Pohl, J. W. McClure, and C. Wong, Phys. Rev. C 4, 607 (1971) ibid.3, 645 (1971)
M. J. Fluss, J. M. Miller, J. M. D'Auria, N. Dudey, B. M. Foreman, L. Kowalski, and R. C. Reedy, Phys. Rev. 187, 1449 (1967) J. M. Miller, in Statistical Properties of Nuclei, edited by J. B. Garg (Plenum, New York, 1972), p. 517 ff
F. Goulding et al., IEEE Trans. Nucl. Sci. NS-11, 388 (1964)
J. H. Degnan, B. L. Cohen, G. R. Rao, and K. C. Chan, Phys. Rev. C 7, 316 (1973)
Omitted endnote
F. G. Perey, Phys. Rev. 131, 745 (1963) C. M. Perey and F. G. Perey, 132, 755 (1963)
R. Balasubramanian, B. L. Cohen, G. R. Rao, C. L. Fink, and J. H. Degnan, Nucl. Phys. A185, 488 (1972)
R. Beurtey et al., Comp. Rend. 252, 1756 (1961) N. Austern, R. M. Drisko, E. Rost, and G. R. Satchler, Phys. Rev. 128, 733 (1962)
C. K. Cline, J. R. Huizenga, and H. K. Vonach, Bull. Am. Phys. Soc. 17, 1, 51 (1972)
R. Arking, R. N. Boyd, J. C. Lombardi, and A. B. Robbins, Nucl. Phys. A155, 480 (1970)
E. J. Schneid, A. Prakash, and B. L. Cohen, Phys. Rev. 156, 1316 (1967)
D. L. Allan, Phys. Letters 14, 311 (1965) D. L. Allan et al., ibid. 17, 56 (1965) ibid.21, 197 (1966)
B. L. Cohen, Phys. Rev. 116, 426 (1959)
N. T. Porile et al., Nucl. Phys. 43, 500 (1963) A. A. Caretto and E. O. Wiig, Phys. Rev. 115, 1238 (1959) G. B. Saha, N. T. Porile, and I. L. Yaffe, ibid. 144, 962 (1966) C. J. Batty et al., Nucl. Phys. A116, 643 (1968) G. Albouy et al., J. Phys. Radium 23, 1000 (1962)
C. K. Cline, private communication

[c1] B. L. Cohen, G. R. Rao, C. L. Fink, J. C. Van der Weerd, and J. A. Penkrot, Phys. Rev. Letters 25, 306 (1970)

[c2] B. L. Cohen, J. H. Degnan, C. L. Fink, G. R. Rao, and R. Balasubramanian, Phys. Rev. Letters 26, 23 (1971)

[c3] G. R. Rao, R. Balasubramanian, B. L. Cohen, C. L. Fink, and J. H. Degnan, Phys. Rev. C 4, 1855 (1971)

[c4] B. L. Cohen and A. G. Rubin, Phys. Rev. 111, 1568 (1958) W. T. Pinkston and G. R. Satchler, Nucl. Phys. 27, 270 (1961) N. Austern, Direct Nuclear Reaction Theories (Wiley-Interscience, New York, 1970)

[c5] J. J. Griffin, Phys. Rev. Letters 17, 478 (1966) M. Blann, ibid. 21, 1357 (1968) C. K. Cline and M. Blann, Nucl. Phys. A172, 225 (1971)

[c6] C. H. Holbrow.and H. H. Barschall, Nucl. Phys. 42, 264 (1963) R. M. Wood, R. R. Borchers, and H. H. Barschall, ibid. 71, 529 (1965) R. R. Borchers, R. M. Wood, and C. H. Holbrow, ibid. 88, 689 (1966) S. M. Grimes, J. D. Anderson, B. A. Pohl, J. W. McClure, and C. Wong, Phys. Rev. C 4, 607 (1971) ibid.3, 645 (1971)

[c7] M. J. Fluss, J. M. Miller, J. M. D'Auria, N. Dudey, B. M. Foreman, L. Kowalski, and R. C. Reedy, Phys. Rev. 187, 1449 (1967) J. M. Miller, in Statistical Properties of Nuclei, edited by J. B. Garg (Plenum, New York, 1972), p. 517 ff

[c8] F. Goulding et al., IEEE Trans. Nucl. Sci. NS-11, 388 (1964)

[c9] J. H. Degnan, B. L. Cohen, G. R. Rao, and K. C. Chan, Phys. Rev. C 7, 316 (1973)

[c10] Omitted endnote

[c11] F. G. Perey, Phys. Rev. 131, 745 (1963) C. M. Perey and F. G. Perey, 132, 755 (1963)

[c12] R. Balasubramanian, B. L. Cohen, G. R. Rao, C. L. Fink, and J. H. Degnan, Nucl. Phys. A185, 488 (1972)

[c13] R. Beurtey et al., Comp. Rend. 252, 1756 (1961) N. Austern, R. M. Drisko, E. Rost, and G. R. Satchler, Phys. Rev. 128, 733 (1962)

[c14] C. K. Cline, J. R. Huizenga, and H. K. Vonach, Bull. Am. Phys. Soc. 17, 1, 51 (1972)

[c15] R. Arking, R. N. Boyd, J. C. Lombardi, and A. B. Robbins, Nucl. Phys. A155, 480 (1970)

[c16] E. J. Schneid, A. Prakash, and B. L. Cohen, Phys. Rev. 156, 1316 (1967)

[c17] D. L. Allan, Phys. Letters 14, 311 (1965) D. L. Allan et al., ibid. 17, 56 (1965) ibid.21, 197 (1966)

[c18] B. L. Cohen, Phys. Rev. 116, 426 (1959)

[c19] N. T. Porile et al., Nucl. Phys. 43, 500 (1963) A. A. Caretto and E. O. Wiig, Phys. Rev. 115, 1238 (1959) G. B. Saha, N. T. Porile, and I. L. Yaffe, ibid. 144, 962 (1966) C. J. Batty et al., Nucl. Phys. A116, 643 (1968) G. Albouy et al., J. Phys. Radium 23, 1000 (1962)

[c20] C. K. Cline, private communication

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Reaction Mechanisms in ( $p, p^{'}$ ) Reactions Exciting the High-Energy Continuum

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Reaction Mechanisms in (p,p′) Reactions Exciting the High-Energy Continuum

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References (20)

Reaction Mechanisms in ( $p, p^{'}$ ) Reactions Exciting the High-Energy Continuum