Abashian-Booth-Crowe resonance structure in the double pionic fusion to ^{4}He

Medientyp: E-Artikel

Titel: Abashian-Booth-Crowe resonance structure in the double pionic fusion to ^{4}He

Beteiligte: Adlarson, P. [Verfasser:in]; Augustyniak, W. [Verfasser:in]; Calen, H. [Verfasser:in]; Wronska, A. [Verfasser:in]; Wüstner, Peter [Verfasser:in]; Wurm, Patrick [Verfasser:in]; Yamamoto, A. [Verfasser:in]; Yuan, X. [Verfasser:in]; Yurev, L. [Verfasser:in]; Zabierowski, J. [Verfasser:in]; Zheng, C. [Verfasser:in]; Zielinski, M. J. [Verfasser:in]; Zipper, W. [Verfasser:in]; Clement, H. [Verfasser:in]; Złomańczuk, J. [Verfasser:in]; Zupranski, P. [Verfasser:in]; Coderre, Daniel [Verfasser:in]; Czerwinski, E. [Verfasser:in]; Demmich, K. [Verfasser:in]; Doroshkevich, E. [Verfasser:in]; Engels, Ralf W. [Verfasser:in]; Erven, W. [Verfasser:in]; Eyrich, W. [Verfasser:in]; Fedorets, P. [Verfasser:in]; [...]

Erschienen: Inst., 2012

Sprache: Englisch

DOI: https://doi.org/10.1103/PhysRevC.86.032201

ISSN: 0556-2813; 1089-490X

Schlagwörter: differential cross section: angular dependence ; mass spectrum: two-pion ; channel cross section: energy dependence ; deuteron deuteron --> helium 2pi0 ; deuteron deuteron: fusion ; experimental results ; 0.4-0.7 GeV/nucleon ; Juelich COSY PS ; WASA ; pi0: pair production ; resonance: width

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Beschreibung: Exclusive and kinematically complete high-statistics measurements of the double pionic fusion reaction $dd \to ^4$He$\pi^0\pi^0$ have been performed in the energy range 0.8 - 1.4 GeV covering thus the region of the ABC effect, which denotes a pronounced low-mass enhancement in the $\pi\pi$-invariant mass spectrum. The experiments were carried out with the WASA detector setup at COSY. Similar to the observation in the basic $pn \to d \pi^0\pi^0$ reaction, the data reveal a correlation between the ABC effect and a resonance-like energy dependence in the total cross section. The maximum occurs at m=2.37 GeV + 2$m_N$, i.e. at the same position as in the basic reaction. The observed resonance width $\Gamma \approx$ 160 MeV can be understood from broadening due to Fermi motion of the nucleons in initial and final nuclei together with collision damping. Differential cross sections are described equally well by the hypothesis of a $pn$ resonance formation during the reaction process.

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