Evidence for Two-Nucleon Processes in <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi>A</mi><mo>(</mo><mrow><msub><mrow><mi>p</mi></mrow><mrow><mi mathvariant="normal">pol</mi></mrow></msub></mrow><mo>,</mo><mi> </mi><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow><mo>)</mo><mi>A</mi><mo>+</mo><mn>1</mn><mn></mn></math></span>

W. W. Jacobs; T. G. Throwe; S. E. Vigdor; M. C. Green; J. R. Hall; H. O. Meyer; W. K. Pitts; M. Dillig

doi:10.1103/PhysRevLett.49.855

Evidence for Two-Nucleon Processes in $A (p_{pol}, π^{-}) A + 1$

W. W. Jacobs, T. G. Throwe, S. E. Vigdor, M. C. Green, J. R. Hall, H. O. Meyer, W. K. Pitts, and M. Dillig

Phys. Rev. Lett. 49, 855 – Published 20 September 1982

Abstract

Possible signatures of two-nucleon pion production processes in reactions $A (p_{pol}, π^{-}) A + 1$ near threshold are identified: a dependence of the analyzing power on the total angular momentum, and a simple scaling of the cross section with subshell occupancy for the struck target neutron. Measurements for ${}^{12, 13, 14}C (p_{pol}, π^{-})$ exhibit these expected features, supporting the view that the fundamental $NN \to NN π$ processes dominate in nuclear pion production.