“ABC” and “DEF” effects in the reaction d + p → He3 + (mm)0: Position, width, isospin, angular and energy distributions

Banaigs, J.; Berger, J.‐P.; Goldzahl, L.; Risser, T.; Vu-Hai, L.; Cottereau, M.; Brun, C. Le

doi:10.1016/0550-3213(73)90317-9

Cited by 59 publications

(34 citation statements)

References 20 publications

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“…Subsequent measurements showed that this enhancement also persists in the fusion reactions to d and 4 He [18][19][20][21][22][23][24][25][26][27][28], if the produced pion pair is of isoscalar nature. Since there was no plausible explanation for this effect, it got named after the initials of the authors of the first publication on that issue.…”

Section: Abc Effectmentioning

confidence: 99%

Examination of the nature of the ABC effect

2017

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Recently it has been shown by exclusive and kinematically complete experiments that the appearance of a narrow resonance structure in double-pionic fusion reactions is strictly correlated with the appearance of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the ππ-invariant mass spectrum. Whereas the resonance structure got its explanation by the d * (2380) dibaryonic resonance, a satisfactory explanation for the ABC effect is still pending. In this paper we discuss possible explanations of the ABC effect and their consequences for the internal structure of the d * dibaryon. To this end we examine and review a variety of proposed explanations for the ABC effect, add a new hypothesis and confront all of them with the experimental results for the np → dπ 0 π 0 and np → npπ 0 π 0 reactions, which are the most challenging ones for this topic.

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Section: Abc Effectmentioning

confidence: 99%

Examination of the nature of the ABC effect

2017

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“…The original ABC data covered only production of the 3 He in the forward hemisphere with respect to the proton beam direction in the center-of-mass system (CMS) [2]. By using a deuteron beam with an energy about twice as high, the acceptance was increased significantly and * E-mail: jahn@hiskp.uni-bonn.de allowed the ABC effect to be observed inclusively in both hemispheres at Saclay [3].…”

Section: Introductionmentioning

confidence: 99%

Experimental study of thepd(dp)→He3ππreactions close to threshold

et al. 2016

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“…Its explanation has been a puzzle since more than 50 years and hence has been named just after the initials of those authors, who first observed this effect. Together with low-statistics bubble chamber measurements these experiments suggested that this effect is correlated with the production of an isoscalar pion pair and with the fact that the participating nucleons fuse to a bound nuclear system in the final state [2][3][4][5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

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

Bashkanov

Clement

Doroshkevich

et al. 2012

EPJ Web of Conferences

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Abstract.With a proton beam of T p = 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.

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“ABC” and “DEF” effects in the reaction d + p → He3 + (mm)0: Position, width, isospin, angular and energy distributions

Cited by 59 publications

References 20 publications

Examination of the nature of the ABC effect

Examination of the nature of the ABC effect

Experimental study of thepd(dp)→He3ππreactions close to threshold

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

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