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Isospin Decomposition of the Basic Double-Pionic Fusion in the Region of the ABC Effect

EPJ Web of Conferences. 2012;37:09004 DOI 10.1051/epjconf/20123709004


Journal Homepage

Journal Title: EPJ Web of Conferences

ISSN: 2100-014X (Online)

Publisher: EDP Sciences

LCC Subject Category: Science: Physics

Country of publisher: France

Language of fulltext: English

Full-text formats available: PDF



Skorodko T.

Pricking A.

Perez del Rio E.

Doroshkevich E.

Clement H.

Bashkanov M.

Wagner G. J.


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Editorial Board

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Time From Submission to Publication: 6 weeks


Abstract | Full Text

With a proton beam of Tp = 1.2 GeV incident on the deuterium pellet target of the WASA detector setup all three basic double-pionic fusion reactions have been measured simultaneously. By use of quasifree kinematics the energy range 2.3 GeV ≤ √s < 2.5 GeV could be covered, which just coincides with the energy region, where the ABC effect and its associated resonance structure has been observed. From the isospin decomposition we see that the resonance effect is solely in the isoscalar part of the reaction process, whereas the isovector part exhibits a monotonic smoothly rising energy dependence and no ABC effect.