Polarization Effects in the Isospin-Coupled Reaction Channels <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>p</mi></math> + <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Zr</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>91</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math> and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>n</mi></math> + <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Nb</mi></mrow><mrow><mi mathvariant="normal">IAS</mi></mrow><mrow><mo>*</mo></mrow><mrow></mrow><mrow></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>91</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math>

J. G. Cramer; E. Preikschat; M. P. Baker; M. D. Hasinoff; G. W. Roth; W. G. Weitkamp; W. J. Braithwaite; C. Fred Moore

doi:10.1103/PhysRevC.6.366

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Polarization Effects in the Isospin-Coupled Reaction Channels $p$ + ${}^{91}{Zr}$ and $n$ + ${}^{91}{Nb}_{IAS}^{*}$

J. G. Cramer, E. Preikschat, M. P. Baker, M. D. Hasinoff^*, G. W. Roth, and W. G. Weitkamp

W. J. Braithwaite

C. Fred Moore

Department of Physics, University of Washington, Seattle, Washington 98195

Department of Physics, Princeton University, Princeton, New Jersey 08540

Center for Nuclear Studies, University of Texas, Austin, Texas 78712

^*Present address: University of British Columbia, Vancouver, B. C., Canada.

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Phys. Rev. C 6, 366 – Published 1 July, 1972

DOI: https://doi.org/10.1103/PhysRevC.6.366

Abstract

The analyzing-power and differential cross-section excitation functions for the reaction $p$ + ${}^{91}{Zr}$ have been measured at 150° in the energy range from 10.0 to 14.9 MeV, which spans the thresholds of the ( $p, n$ ) quasi-elastic and quasi-inelastic reaction channels leading to the production of the analogs in ${}^{91}{Nb}$ of the ${}^{91}{Zr}$ target ground state and ${\frac{5}{2}}^{+}$ (1.46 MeV) excited state, respectively. A pronounced variation in the analyzing power is observed in the ( $\vec{p}, d_{0}$ ) exit channel at just the energy regions where charge-exchange coupling is expected to occur due to the opening of the quasi-elastic and quasi-inelastic channels. Somewhat less expected is the change in analyzing power observed in the elastic proton channel in the vicinity of the quasi-elastic and quasi-inelastic thresholds. Sharp resonance structures are observed in the analyzing-power and differential cross-section excitation functions for the ( $\vec{p}, d_{0}$ ) channel near the quasi-elastic and quasi-inelastic thresholds which are not readily observable in the elastic channel. The analyzing power for the ( $\vec{p}, n \tilde{p}$ ) process has been measured at a number of energies in this region and found to be consistent with zero.

References (18)

C. F. Moore, C. E. Watson, S. A. A. Zaidi, J. J. Kent, and J. G. Kulleck, Phys. Rev. Letters 17, 926 (1966)
S. A. A. Zaidi and P. von Brentano, Phys. Letters 23, 466 (1966)
T. Tamura and C. E. Watson, Phys. Letters 25B, 186 (1967)
J. Zimányi and B. Gyarmati, Phys. Letters 27B, 120 (1968)
R. Coker and T. Tamura, Phys. Rev. 182, 1277 (1969) H. Bledsoe, R. Coker, and T. Tamura, to be published
A. M. Lane, Phys. Letters 33B, 274 (1970)
J. Zimányi and J. P. Bondorf, Nucl. Phys. A146, 81 (1970) Rev. C 2, 1384 (1970)
C. F. Moore, Phys. Letters 25B, 408 (1967) R. Heffner, C. Ling, N. Cue, and P. Richard, 26B, 150 (1968)
W. R. Coker and C. F. Moore, Phys. Letters 25B, 271 (1967)
R. A. Hinrichs, G. W. Phillips, J. G. Cramer, and H. Wieman, Phys. Rev. Letters 22, 301 (1969) Phys. Rev. C 4, 1366 (1971)
L. S. Michelman, T. I. Bonner, and J. G. Kulleck, Phys. Letters 28B, 659 (1969)
G. Clausnitzer, G. Graw, C. F. Moore, and K. Wienhard, Phys. Rev. Letters 22, 793 (1969)
T. Tamura, private communication
W. Haeberli, in Polarization Phenomena in Nuclear Reactions, edited by H. H. Barschall and W. Haeberli (University of Wisconsin Press, Madison, 1971), p. 235
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[c1] C. F. Moore, C. E. Watson, S. A. A. Zaidi, J. J. Kent, and J. G. Kulleck, Phys. Rev. Letters 17, 926 (1966)

[c2] S. A. A. Zaidi and P. von Brentano, Phys. Letters 23, 466 (1966)

[c3] T. Tamura and C. E. Watson, Phys. Letters 25B, 186 (1967)

[c4] J. Zimányi and B. Gyarmati, Phys. Letters 27B, 120 (1968)

[c5] R. Coker and T. Tamura, Phys. Rev. 182, 1277 (1969) H. Bledsoe, R. Coker, and T. Tamura, to be published

[c6] A. M. Lane, Phys. Letters 33B, 274 (1970)

[c7] J. Zimányi and J. P. Bondorf, Nucl. Phys. A146, 81 (1970) Rev. C 2, 1384 (1970)

[c8] C. F. Moore, Phys. Letters 25B, 408 (1967) R. Heffner, C. Ling, N. Cue, and P. Richard, 26B, 150 (1968)

[c9] W. R. Coker and C. F. Moore, Phys. Letters 25B, 271 (1967)

[c10] R. A. Hinrichs, G. W. Phillips, J. G. Cramer, and H. Wieman, Phys. Rev. Letters 22, 301 (1969) Phys. Rev. C 4, 1366 (1971)

[c11] L. S. Michelman, T. I. Bonner, and J. G. Kulleck, Phys. Letters 28B, 659 (1969)

[c12] G. Clausnitzer, G. Graw, C. F. Moore, and K. Wienhard, Phys. Rev. Letters 22, 793 (1969)

[c13] T. Tamura, private communication

[c14] W. Haeberli, in Polarization Phenomena in Nuclear Reactions, edited by H. H. Barschall and W. Haeberli (University of Wisconsin Press, Madison, 1971), p. 235

[c15] E. Preikschat, G. Michel, G. W. Roth, J. G. Cramer, Jr., and W. G. Weitkamp, in Polarization Phenomena in Nuclear Reactions [14]), p. 832

[c16] J. A. Nolen, Jr., G. C. Morrison, J. P. Schiffer, and N. Williams, Bull. Am. Phys. Soc. 12, 526 (1967) J. P. Bondorf, C. Ellegaard, J. Kantele, H. Lütken, and P. Vedelsby, Nucl. Phys. A101, 338 (1967)

[c17] K. Wienhard and G. Graw, in Polarization Phenomena in Nuclear Reactions ([14]), p. 655

[c18] C. F. Moore, S. A. A. Zaidi, and J. J. Kent, Phys. Rev. Letters 18, 345 (1967)

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Polarization Effects in the Isospin-Coupled Reaction Channels $p$ + ${}^{91}{Zr}$ and $n$ + ${}^{91}{Nb}_{IAS}^{*}$

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Polarization Effects in the Isospin-Coupled Reaction Channels p + Zr91 and n + NbIAS*91

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Polarization Effects in the Isospin-Coupled Reaction Channels $p$ + ${}^{91}{Zr}$ and $n$ + ${}^{91}{Nb}_{IAS}^{*}$