Study of the ABC enhancement in the reaction

Wurzinger, R.; Bing, O.; Boivin, M.; Courtat, P.; Fäldt, Göran; Gacougnolle, R.; Gårdestig, Anders; Hibou, F.; Bornec, Y. Le; Martin, J.; Plouin, F.; Tatischeff, B.; Wilkin, C.; Willis, N.; Yonnet, Jean‐Paul; Zghiche, A.

doi:10.1016/s0370-2693(98)01464-6

Cited by 30 publications

(30 citation statements)

References 14 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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“…Its explanation has been a puzzle since then. In subsequent bubble-chamber [2,3] and single-arm magnetic spectrometer measurements [4][5][6][7][8][9][10][11][12] this enhancement was observed also in double-pionic fusion reactions leading to d, 3He, and 4He, if an isoscalar pion pair was produced. However, such an enhancement was not observed in fusion reactions leading to deuteron and triton, if an isovector pion pair was produced.…”

Section: Introductionmentioning

confidence: 99%

ABC effect and resonance structure in the double-pionic fusion toHe3

Adlarson¹,

Augustyniak²,

Bardan³

et al. 2015

Phys. Rev. C

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Exclusive and kinematically complete measurements of the double pionic fusion to 3He have been performed in the energy region of the so-called ABC effect, which denotes a pronounced low-mass enhancement in the 7T7r-invariant mass spectrum. The experiments were carried out with the WASA detector setup at COSY (the cooler synchrotron at Forschungszentrum Jiilich). Similar to the observations in the basic pn -* d n 07t° reaction and in the dd 4 He n ajr0 reaction, the data reveal a correlation between the ABC effect and a resonance-like energy dependence in the total cross section. Differential cross sections are well described by the hypothesis of d* resonance formation during the reaction process in addition to the conventional /-channel AA mechanism. The deduced d* resonance width can be understood from collision broadening due to Fermi motion of the nucleons in initial and final nuclei.

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“…Therefore it has been named just after the initials of those authors. In subsequent bubble-chamber [2,3] and single-arm magnetic spectrometer measurements [4][5][6][7][8][9][10][11] this enhancement showed up in double-pionic fusion reactions leading to d, 3 He and 4 He, if an isoscalar pion pair was produced. However, such an enhancement was not observed in fusion reactions leading to deuteron and triton, if an isovector pion pair was produced.…”

Section: Introductionmentioning

confidence: 99%

ABC Effect and Resonance Structure in the Double-Pionic Fusion to³He

Río

Bashkanov

Clement

et al. 2012

EPJ Web of Conferences

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Abstract. Historically the double-pionic fusion to 3 He is the reaction, where the ABC effect (low-mass enhancement of the ππ-invariant mass spectrum) was observed for the first time more than 50 years ago. Meanwhile exclusive and kinematically complete highstatistics measurements with WASA at COSY revealed a strict correlation between the ABC effect and a narrow resonance structure with I(J P ) = 0(3 + ) in the total cross section of the most basic double-pionic fusion, the pn → dπ 0 π 0 reaction. In order to investigate the situation in the double-pionic fusion to 3 He the energy dependence of the ABC effect in the fusion to 3 He has been measured by fixed energy measurements of the type pd → 3 Heππ as well as by quasifree and coherent measurements of the type dd → 3 He n ππ.

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Study of the ABC enhancement in the reaction

Cited by 30 publications

References 14 publications

Examination of the nature of the ABC effect

Examination of the nature of the ABC effect

ABC effect and resonance structure in the double-pionic fusion toHe3

ABC Effect and Resonance Structure in the Double-Pionic Fusion to³He

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Study of the ABC enhancement in the reaction

Cited by 30 publications

References 14 publications

Examination of the nature of the ABC effect

Examination of the nature of the ABC effect

ABC effect and resonance structure in the double-pionic fusion toHe3

ABC Effect and Resonance Structure in the Double-Pionic Fusion to3He

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ABC Effect and Resonance Structure in the Double-Pionic Fusion to³He