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Phenomenological study of the pp -> pi(+) pn reaction
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
UCL, Phys & Astron Dept, Gower St, London WC1E 6BT, England..
2018 (English)In: Physical Review C: Covering Nuclear Physics, ISSN 2469-9985, E-ISSN 2469-9993, Vol. 97, no 2, article id 025201Article in journal (Refereed) Published
Abstract [en]

Fully constrained bubble chamber data on the pp -> pi(+) pn and pp -> pi(+) d reactions are used to investigate the ratio of the counting rates for the two processes as function of the pn excitation energy Q. Though it is important to include effects associated with the p-wave nature of pion production, the data are insufficient to establish unambiguously the dependence on Q. The angular distributions show the presence of higher partial waves which seem to be anomalously large at small Q. The dispersion relation method to determine scattering lengths is extended to encompass cases where, as for the pp -> pi(+) pn reaction, there is a bound state and, in a test example, it is shown that the values deduced for the low-energy neutron-proton scattering parameters are significantly influenced by the pion p-wave behavior.

Place, publisher, year, edition, pages
AMER PHYSICAL SOC , 2018. Vol. 97, no 2, article id 025201
National Category
Subatomic Physics
Identifiers
URN: urn:nbn:se:uu:diva-348110DOI: 10.1103/PhysRevC.97.025201ISI: 000424903300001OAI: oai:DiVA.org:uu-348110DiVA, id: diva2:1197153
Available from: 2018-04-12 Created: 2018-04-12 Last updated: 2018-04-12Bibliographically approved

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Fäldt, Göran

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