Differential Cross Section of the <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">pn</mi><mo>→</mo><mi mathvariant="italic">pp</mi><mrow><msup><mrow><mo>(</mo></mrow><mrow><mn>1</mn></mrow></msup></mrow><mrow><msub><mrow><mi>S</mi></mrow><mrow><mn>0</mn></mrow></msub></mrow><mo>)</mo><mrow><msup><mrow><mi mathvariant="italic">π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math></span> Reaction Extracted from <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="italic">pd</mi><mspace></mspace><mo>→</mo><mspace></mspace><mi mathvariant="italic">ppp</mi><mrow><msup><mrow><mi>π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math></span>

F. Duncan; H. Hahn; C. Aclander; D. Ashery; E. G. Auld; D. R. Gill; D. A. Hutcheon; G. Jones; E. Korkmaz; S. Maytal-Beck; M. A. Moinester; J. A. Niskanen; D. Ottewell; A. Rahav; S. Ram; M. Sevior; P. L. Walden; R. Weiss

doi:10.1103/PhysRevLett.80.4390

Differential Cross Section of the $pn \to pp (^{1} S_{0}) π^{-}$ Reaction Extracted from $pd \to ppp π^{-}$

F. Duncan, H. Hahn, C. Aclander, D. Ashery, E. G. Auld, D. R. Gill, D. A. Hutcheon, G. Jones, E. Korkmaz, S. Maytal-Beck, M. A. Moinester, J. A. Niskanen, D. Ottewell, A. Rahav, S. Ram, M. Sevior, P. L. Walden, and R. Weiss

Phys. Rev. Lett. 80, 4390 – Published 18 May 1998

Abstract

The double differential cross section for $pn \to pp (^{1} S_{0}) π^{-}$ at three beam energies has been extracted from the quasifree process $pd \to ppp π^{-}$ . A comparison is carried out with single differential cross section measurements for $^{3} He (π^{-}, p n) n$ , where the pion is thought to be absorbed onto a $pp (^{1} S_{0})$ “diproton” state. A significant difference is observed in the shape of the angular distribution between the production and absorption data. This difference is ascribed to the effects of the $^{3} He$ nuclear environment characterizing the absorption process; however, an adequate theoretical explanation is not available.

Received 18 December 1997

DOI:https://doi.org/10.1103/PhysRevLett.80.4390

Authors & Affiliations

F. Duncan¹, H. Hahn³, C. Aclander³, D. Ashery³, E. G. Auld², D. R. Gill⁴, D. A. Hutcheon⁴, G. Jones², E. Korkmaz⁵, S. Maytal-Beck³, M. A. Moinester³, J. A. Niskanen⁶, D. Ottewell⁴, A. Rahav³, S. Ram³, M. Sevior⁷, P. L. Walden⁴, and R. Weiss³

¹Department of Physics, Queen's University, Kingston, Ontario, Canada K7L 3N6
²Department of Physics, University of British Columbia, Vancouver, British Columbia, Canada V6T 1Z1
³Raymond and Beverly Sackler Faculty of Exact Sciences, School of Physics and Astronomy, Tel-Aviv University, 69978 Ramat Aviv, Israel
⁴TRIUMF, 4004 Wesbrook Mall, Vancouver, British Columbia, Canada V6T 2A3
⁵Department of Physics, University of Northern British Columbia, Prince George, British Columbia, Canada V2L 5P2
⁶Department of Physics, University of Helsinki, P.O. Box 9, FIN-00014 Finland
⁷School of Physics, University of Melbourne, Parkville, Victoria, Australia 3052