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Abashian-Booth-Crowe Effect in Basic Double-Pionic Fusion: A New Resonance?
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Nuclear Physics.
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2011 (English)In: Physical Review Letters, ISSN 0031-9007, Vol. 106, no 24, 242302- p.Article in journal (Refereed) Published
Abstract [en]

We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn -> d pi(0)pi(0) over the full energy region of the ABC effect, a pronounced low-mass enhancement in the pi pi-invariant mass spectrum. The measurements, which cover also the transition region to the conventional t- channel Delta Delta process, were performed with the upgraded WASA detector setup at COSY. The data reveal the Abashian-Booth-Crowe effect to be uniquely correlated with a Lorentzian energy dependence in the integral cross section. The observables are consistent with a narrow resonance with m = 2.37 GeV, Gamma approximate to 70 MeV and I(J(P)) = 0(3(+)) in both pn and Delta Delta systems. Necessary further tests of the resonance interpretation are discussed.

Place, publisher, year, edition, pages
2011. Vol. 106, no 24, 242302- p.
National Category
Natural Sciences
URN: urn:nbn:se:uu:diva-155911DOI: 10.1103/PhysRevLett.106.242302ISI: 000291734300003OAI: oai:DiVA.org:uu-155911DiVA: diva2:429665
Available from: 2011-07-05 Created: 2011-07-04 Last updated: 2016-05-10Bibliographically approved

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