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Abashian-Booth-Crowe resonance structure in the double pionic fusion to He-4
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
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2012 (English)In: Physical Review C. Nuclear Physics, ISSN 0556-2813, E-ISSN 1089-490X, Vol. 86, no 3, 032201- p.Article in journal (Refereed) Published
Abstract [en]

Exclusive and kinematically complete high-statistics measurements of the double pionic fusion reaction dd -> He-4 pi(0)pi(0) have been performed in the energy range 0.8-1.4 GeV covering thus the region of the Abashian-Booth-Crowe effect, which denotes a pronounced low-mass enhancement in the pi pi invariant mass spectrum. The experiments were carried out with the WASA detector setup at the cooler synchrotron at Forshungszentrum Julich GmbH. Similar to the observation in the basic pn -> d pi(0)pi(0) reaction, the data reveal a correlation between the ABC effect and a resonancelike energy dependence in the total cross section. The maximum occurs at m = 2.37 GeV + 2m(N), i.e., at the same position as in the basic reaction. The observed resonance width Gamma approximate to 160 MeV can be understood from broadening due to Fermi motion of the nucleons in initial and final nuclei together with collision damping. Differential cross sections are described equally well by the hypothesis of a pn resonance formation during the reaction process.

Place, publisher, year, edition, pages
2012. Vol. 86, no 3, 032201- p.
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Physical Sciences
URN: urn:nbn:se:uu:diva-182753DOI: 10.1103/PhysRevC.86.032201ISI: 000308460800001OAI: oai:DiVA.org:uu-182753DiVA: diva2:561414
Available from: 2012-10-18 Created: 2012-10-15 Last updated: 2012-10-18Bibliographically approved

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Adlarson, PatrikCalén, HansFransson, KjellGullström, Carl-OscarHeijkenskjöld, LenaHöistad, BoJohansson, TordKupsc, AndrzejMarciniewski, PawelPyszniak, AndzejRedmer, Christoph F.Wolke, MagnusZlomanczuk, Jozef
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