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 Double-Pionic Fusion of Nuclear Systems and the ABC Effect: Approaching a Puzzle by Exclusive and Kinematically Complete Measurements
Stockholm University, Faculty of Science, Department of Physics. (kärnfysik)
Stockholm University, Faculty of Science, Department of Physics. (kärnfysik)
Stockholm University, Faculty of Science, Department of Physics. (kärnfysik)
Stockholm University, Faculty of Science, Department of Physics. (kärnfysik)
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2009 (English)In: Physical Review Letters, ISSN 0031-9007, E-ISSN 1079-7114, Vol. 102, no 5, 052301- p.Article in journal (Refereed) Published
Abstract [en]

The ABC effect—a puzzling low-mass enhancement in the ππ invariant mass spectrum, first observed by Abashian, Booth, and Crowe—is well known from inclusive measurements of two-pion production in nuclear fusion reactions. Here we report on the first exclusive and kinematically complete measurements of the most basic double-pionic fusion reaction pn→dπ0π0 at beam energies of 1.03 and 1.35 GeV. The measurements, which have been carried out at CELSIUS-WASA, reveal the ABC effect to be a (ππ)I=L=0 channel phenomenon associated with both a resonancelike energy dependence in the integral cross section and the formation of a ΔΔ system in the intermediate state. A corresponding simple s-channel resonance ansatz provides a surprisingly good description of the data.

Place, publisher, year, edition, pages
2009. Vol. 102, no 5, 052301- p.
National Category
Subatomic Physics
Research subject
Nuclear Physics
Identifiers
URN: urn:nbn:se:su:diva-32646DOI: 10.1103/PhysRevLett.102.052301ISI: 000263166400020OAI: oai:DiVA.org:su-32646DiVA: diva2:281221
Note
Totalt 49 författareAvailable from: 2009-12-15 Created: 2009-12-15 Last updated: 2017-12-12Bibliographically approved

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