Polarization transfer in quasifree ( p→,n→ ) reactions at 495 MeV

X. Y. Chen, T. N. Taddeucci, J. B. McClelland, T. A. Carey, R. C. Byrd, L. J. Rybarcyk, W. C. Sailor, D. J. Mercer, D. L. Prout, S. DeLucia, B. Luther, D. G. Marchlenski, E. Sugarbaker, J. Rapaport, E. Gülmez, C. A. Whitten, Jr., C. D. Goodman, W. Huang, Y. Wang, and W. P. Alford
Phys. Rev. C 47, 2159 – Published 1 May 1993
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Abstract

A complete set of polarization-transfer observables has been measured for quasifree (p→,n→) reactions on H2, C12, and Ca40 at a bombarding energy of 495 MeV and a laboratory scattering angle of 18°. The data span an energy-loss range from 0 to 160 MeV, with a corresponding momentum transfer range of qc.m.=1.7–1.9 fm1. The laboratory observables are used to construct partial cross sections proportional to the nonspin response and three orthogonal spin responses. These results are compared to the transverse spin response measured in deep inelastic electron scattering and to nuclear responses based on the random phase approximation. The polarization observables for all three targets are remarkably similar and reveal no evidence for an enhancement of the spin-longitudinal nuclear response relative to the spin-transverse response. These results suggest the need for substantial modifications to the standard form assumed for the residual particle-hole interaction.

  • Received 22 January 1993

DOI:https://doi.org/10.1103/PhysRevC.47.2159

©1993 American Physical Society

Authors & Affiliations

X. Y. Chen, T. N. Taddeucci, J. B. McClelland, T. A. Carey, R. C. Byrd, L. J. Rybarcyk, W. C. Sailor, D. J. Mercer, D. L. Prout, S. DeLucia, B. Luther, D. G. Marchlenski, E. Sugarbaker, J. Rapaport, E. Gülmez, C. A. Whitten, Jr., C. D. Goodman, W. Huang, Y. Wang, and W. P. Alford

  • University of Colorado, Boulder, Colorado 80309
  • Los Alamos National Laboratory, Los Alamos, New Mexico 87545
  • The Ohio State University, Columbus, Ohio 43210
  • Ohio University, Athens, Ohio 45701
  • University of California, Los Angeles, California 90024
  • Indiana University Cyclotron Facility, Bloomington, Indiana 47405
  • University of Western Ontario, London, Ontario, Canada N6A 3K7

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Vol. 47, Iss. 5 — May 1993

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