Momentum Dependence of the Nuclear Isovector Spin Responses from (<span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mrow><mover><mrow><mi>p</mi></mrow><mrow><mo>→</mo></mrow></mover></mrow></mrow><mo>,</mo><mrow><mrow><mover><mrow><mi>n</mi></mrow><mrow><mo>→</mo></mrow></mover></mrow></mrow></math></span>) Reactions at 494 MeV

T. N. Taddeucci; B. A. Luther; L. J. Rybarcyk; R. C. Byrd; J. B. McClelland; D. L. Prout; S. DeLucia; D. A. Cooper; D. G. Marchlenski; E. Sugarbaker; B. K. Park; Thomas Sams; C. D. Goodman; J. Rapaport; M. Ichimura; K. Kawahigashi

doi:10.1103/PhysRevLett.73.3516

Momentum Dependence of the Nuclear Isovector Spin Responses from ( $\vec{p}, \vec{n}$ ) Reactions at 494 MeV

T. N. Taddeucci, B. A. Luther, L. J. Rybarcyk, R. C. Byrd, J. B. McClelland, D. L. Prout, S. DeLucia, D. A. Cooper, D. G. Marchlenski, E. Sugarbaker, B. K. Park, Thomas Sams, C. D. Goodman, J. Rapaport, M. Ichimura, and K. Kawahigashi

Phys. Rev. Lett. 73, 3516 – Published 26 December 1994

Abstract

Complete sets of polarization transfer coefficients have been measured for quasifree ( $\vec{p}, \vec{n}$ ) scattering from ${}^{2}H$ , ${}^{12}C$ , and ${}^{40}{Ca}$ at 494 MeV and scattering angles of 12.5°, 18°, and 27° ( $q = 1.2, 1.7, 2.5$ ${fm}^{- 1}$ ). These measurements yield separated transverse ( $σ \times q$ ) and longitudinal ( $σ \cdot q$ ) isovector spin responses. Comparison of the separated responses to calculations and to electron-scattering responses reveals a strong enhancement in the spin transverse channel. This excess transverse strength masks the effect of pionic correlations in the response ratio.