Elastic scattering of 19.5 and 30 MeV positive and negative pions from <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi mathvariant="normal">Ca</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>40</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow></math></span>

D. H. Wright; M. Blecher; B. G. Ritchie; D. Rothenberger; R. L. Burman; Z. Weinfeld; J. A. Escalante; C. S. Mishra; C. S. Whisnant

doi:10.1103/PhysRevC.37.1155

Elastic scattering of 19.5 and 30 MeV positive and negative pions from ${}^{40}{Ca}$

D. H. Wright, M. Blecher, B. G. Ritchie, D. Rothenberger, R. L. Burman, Z. Weinfeld, J. A. Escalante, C. S. Mishra, and C. S. Whisnant

Phys. Rev. C 37, 1155 – Published 1 March 1988

Abstract

Cross sections for the elastic scattering of positive and negative pions from calcium at 19.5 and 30 MeV were measured at scattering angles between 18° and 110°. They are compared to the angular distributions predicted by three optical models. Both 19.5 and 30 MeV data agree best with the predictions of a potential whose strengths are taken from a phenomenological potential designed to reproduce anomalously small level shifts and widths in pionic atoms.