Observation of the ABC effect and final-state isospin

E. A. Doroshkevich; M. A. Bashkanov; H. Clement; E. Perez del Rio; A. Pricking; T. Yu Skorodko; G. J. Wagner

doi:10.1134/S1063778814070047

Observation of the ABC effect and final-state isospin

E. A. Doroshkevich^*, M. A. Bashkanov, H. Clement, E. Perez del Rio, A. Pricking, T. Yu Skorodko, G. J. Wagner

^*Corresponding author for this work

Physics

Research output: Contribution to journal › Article › peer-review

Abstract

Despite the number of inclusive measurements of the pionic fusion reactions, the nature of the ABC effect discovered in 1960 was not completely established. Exclusive measurements of the doublepion-production reactions leading to either fused d, ³He and ⁴He nuclear final states or pp pairs are analyzed. A significant ABC effect—enhancement in the region of low ππ mass—is found only in the isoscalar ππ channel while in the isovector channels it is small or absent. For the reaction with isovector pp final state an ABC effect was not observed even at the special kinematic conditions to reproduce a quasi-bound two-proton state. The total cross sections for the d and 4He fusion reactions show similar resonance-like energy dependence.

Original language	English
Pages (from-to)	936-940
Number of pages	5
Journal	Physics of Atomic Nuclei
Volume	77
Issue number	7
DOIs	https://doi.org/10.1134/S1063778814070047
Publication status	Published - Jul 2014

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abstract = "Despite the number of inclusive measurements of the pionic fusion reactions, the nature of the ABC effect discovered in 1960 was not completely established. Exclusive measurements of the doublepion-production reactions leading to either fused d, 3He and 4He nuclear final states or pp pairs are analyzed. A significant ABC effect—enhancement in the region of low ππ mass—is found only in the isoscalar ππ channel while in the isovector channels it is small or absent. For the reaction with isovector pp final state an ABC effect was not observed even at the special kinematic conditions to reproduce a quasi-bound two-proton state. The total cross sections for the d and 4He fusion reactions show similar resonance-like energy dependence.",

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AU - Doroshkevich, E. A.

AU - Bashkanov, M. A.

AU - Clement, H.

AU - Perez del Rio, E.

AU - Pricking, A.

AU - Skorodko, T. Yu

AU - Wagner, G. J.

PY - 2014/7

Y1 - 2014/7

N2 - Despite the number of inclusive measurements of the pionic fusion reactions, the nature of the ABC effect discovered in 1960 was not completely established. Exclusive measurements of the doublepion-production reactions leading to either fused d, 3He and 4He nuclear final states or pp pairs are analyzed. A significant ABC effect—enhancement in the region of low ππ mass—is found only in the isoscalar ππ channel while in the isovector channels it is small or absent. For the reaction with isovector pp final state an ABC effect was not observed even at the special kinematic conditions to reproduce a quasi-bound two-proton state. The total cross sections for the d and 4He fusion reactions show similar resonance-like energy dependence.

AB - Despite the number of inclusive measurements of the pionic fusion reactions, the nature of the ABC effect discovered in 1960 was not completely established. Exclusive measurements of the doublepion-production reactions leading to either fused d, 3He and 4He nuclear final states or pp pairs are analyzed. A significant ABC effect—enhancement in the region of low ππ mass—is found only in the isoscalar ππ channel while in the isovector channels it is small or absent. For the reaction with isovector pp final state an ABC effect was not observed even at the special kinematic conditions to reproduce a quasi-bound two-proton state. The total cross sections for the d and 4He fusion reactions show similar resonance-like energy dependence.

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Observation of the ABC effect and final-state isospin

Abstract

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