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Observation of the abc effect in the first exclusive measurements of pn -> d pi(0)pi(0)
Physikalisches Institut, Universität Tüubingen.
Uppsala University, The Svedberg Laboratory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Nuclear and Particle Physics.
Uppsala University, The Svedberg Laboratory.
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2007 (English)In: International Journal of Modern Physics A, ISSN 0217-751X, E-ISSN 1793-656X, Vol. 22, no 2-3, 617-620 p.Article in journal (Refereed) Published
Abstract [en]

The reaction pn → dπ0π0 constitutes the most fundamental system for the study of the ABC effect - a puzzling threshold enhancement in the ππ invariant mass spectrum of the ππ system in double-pionic fusion to nuclear bound states. The first exclusive measurements of this reaction have now been carried out at CELSIUS-WASA. They exhibit a striking low-mass enhancement in the ππ invariant mass spectrum, prove it to be a σ-channel phenomenon and falsify conventional theoretical models, which predict an associated high-mass enhancement not present in the new exclusive data. In the kinematically complete data sample we observe a ΔΔ excitation, where the interaction between the two Δ obviously plays a crucial role for the generation of the ππ low-mass enhancement.

Place, publisher, year, edition, pages
2007. Vol. 22, no 2-3, 617-620 p.
Keyword [en]
ABC effect, σ channel enhancement, ΔΔ interaction, medium effects
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-16891DOI: 10.1142/S0217751X07035963ISI: 000250926800063OAI: oai:DiVA.org:uu-16891DiVA: diva2:44662
Available from: 2008-06-16 Created: 2008-06-16 Last updated: 2017-12-08Bibliographically approved

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Calèn, HansFransson, KjellGustafsson, LeifHöistad, BoJacewicz, MarekJohansson, TordKeleta, SamsonKullander, SvenKupsc, AndrzejMarciniewski, PawelThörngren-Engblom, PiaZlomanczuk, Jozef

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Calèn, HansFransson, KjellGustafsson, LeifHöistad, BoJacewicz, MarekJohansson, TordKeleta, SamsonKullander, SvenKupsc, AndrzejMarciniewski, PawelThörngren-Engblom, PiaZlomanczuk, Jozef
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The Svedberg LaboratoryDepartment of Nuclear and Particle Physics
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International Journal of Modern Physics A
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