Exclusive measurement of two-pion production in the reaction

Keleta, S.; Bargholtz, Chr.; Bashkanov, M.; Berłowski, M.; Bogoslawsky, D.; Calén, H.; Clement, H.; Demirörs, L.; Ekström, C.; Fransson, K.; Gerén, L.; Gustafsson, L.; Höistad, B.; Ivanov, G.; Jacewicz, M.; Jiganov, E.; Johansson, T.; Khakimova, O.; Kren, F.; Kullander, S.; Kupść, A.; Kuzmin, A.; Lindberg, K.; Marciniewski, P.; Morosov, B.; Oelert, W.; Pauly, C.; Petrén, H.; Petukhov, Y.; Povtorejko, A.; Pricking, A.; Ruber, Roger; Schönning, K.; Scobel, W.; Shafigullin, R.; Shwartz, B.; Skorodko, T.; Sopov, V.; Steṕaniak, J.; Tegnér, P.-E.; Engblom, P. Thörngren; Tikhomirov, V.; Turowiecki, A.; Wagner, G. J.; Wilkin, C.; Wolke, M.; Zabierowski, J.; Zartova, I.; Złomańczuk, J.

doi:10.1016/j.nuclphysa.2009.04.008

Cited by 22 publications

(5 citation statements)

References 48 publications

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“…d 0 0 [6], pd ! 3 He [7] and dd 4 He [8] the first exclusive double-pionic fusion measurements of solid statistics carried out at CELSIUS/ WASA firmly established the presence of a pronounced low -mass enhancement. In addition, the first reaction showed a peculiar resonancelike behavior in the energy dependence of the total cross section [6]-indicative of a resonance in pn and ÁÁ systems at a mass roughly 90 MeV below 2m Á and a width much smaller than expected from the conventional t-channel ÁÁ excitation process.…”

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confidence: 82%

Abashian-Booth-Crowe Effect in Basic Double-Pionic Fusion: A New Resonance?

Adlarson¹,

Adolph²,

Augustyniak³

et al. 2011

Phys. Rev. Lett.

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218

125

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We report on an exclusive and kinematically complete high-statistics measurement of the basic doublepionic fusion reaction pn ! d 0 0 over the full energy region of the ABC effect, a pronounced low-mass enhancement in the -invariant mass spectrum. The measurements, which cover also the transition region to the conventional t-channel ÁÁ 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 PRL

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confidence: 82%

Abashian-Booth-Crowe Effect in Basic Double-Pionic Fusion: A New Resonance?

Adlarson¹,

Adolph²,

Augustyniak³

et al. 2011

Phys. Rev. Lett.

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218

125

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“…Finally we note that meanwhile we also carried out exclusive and kinematically complete measurements of the double-pionic fusion to 3 He and 4 He. Again we observe huge low-mass enhancements in the M π 0 π 0 spectra [45,46,47]. This means that this resonance is obviously robust enough to survive even in the nuclear medium.…”

Section: Discussionmentioning

confidence: 81%

Systematic Study of Two-Pion Production in NN Collisions—from Single-Baryon to Di-Baryon Excitations

Skorodko

Bashkanov

Clement

et al. 2010

AIP Conference Proceedings

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Abstract. The two-pion production in nucleon-nucleon collisions has been studied by exclusive and kinematically complete experiments from threshold up to T p = 1.36 GeV at CELSIUS-WASA. At near-threshold energies the total and differential distributions for the π + π − and π 0 π 0 channels are dominated by Roper excitation and its decay into Nσ and ∆π channels. At beam energies T p > 1.1 GeV the ∆∆ excitation governs the two-pion production process. In the π + π + channel evidence is found for the excitation of a higher-lying I=3/2 resonance, favorably the ∆(1600). The isovector fusion processes leading to the deuteron and to quasi-stable 2 He, respectively, exhibit no or only a modest ABC-effect, i.e. low-mass enhancement in the ππ-invariant mass spectrum, and can be described by conventional t-channel ∆∆ excitation. On the other hand, the isoscalar fusion process to the deuteron exhibits a dramatic ABC-effect correlated with a narrow resonance-like energy dependence in the total cross section with a width of only 50 MeV and situated at a mass 90 MeV below the ∆∆ mass.

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“…This is not unexpected if both are driven by the ∆∆ intermediate state. The ABC effect is seen also in pd → 3 He π 0 π 0 and, most spectacularly, in dd → 4 He π 0 π 0 [194,195]. However, in the dd case the cross section and deuteron tensor analyzing power have been described using conventional physics without the need for the d * (2380) [196].…”

Section: Two-pion Production In Neutron-proton Collisionsmentioning

confidence: 99%