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

Journal Article · Fri Jun 17 04:00:00 EDT 2011 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.106.242302· OSTI ID:21567463

Adlarson, P; Calen, H; Fransson, K; Gullstroem, C -O; Heijkenskjoeld, L; Hoeistad, B; Jacewicz, M; Johansson, T; Kullander, S; Kupsc, A; Marciniewski, P; Plucinski, P; Redmer, C F; Wolke, M; Zlomanczuk, J ^[1]; Adolph, C; Eyrich, W; Schmidt, A; Schroeder, W ^[2]

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1. Department of Physics and Astronomy, Uppsala University, 75120 Uppsala (Sweden)
2. Physikalisches Institut, Friedrich-Alexander- Universitaet Erlangen-Nuernberg, 91058 Erlangen (Germany)

We report on an exclusive and kinematically complete high-statistics measurement of the basic double-pionic fusion reaction pn{yields}d{pi}{sup 0}{pi}{sup 0} over the full energy region of the ABC effect, a pronounced low-mass enhancement in the {pi}{pi}-invariant mass spectrum. The measurements, which cover also the transition region to the conventional t-channel {Delta}{Delta} 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 with m=2.37 GeV, {Gamma}{approx_equal}70 MeV and I(J{sup P})=0(3{sup +}) in both pn and {Delta}{Delta} systems. Necessary further tests of the resonance interpretation are discussed.

• OSTI ID: 21567463
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 24 Vol. 106; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
ABC EFFECT
ACCELERATORS
COSY STORAGE RING
CROSS SECTIONS
CYCLIC ACCELERATORS
ENERGY DEPENDENCE
ENERGY RANGE
GEV RANGE
GEV RANGE 01-10
INTEGRAL CROSS SECTIONS
MASS
MASS SPECTRA
MEV RANGE
MEV RANGE 10-100
RESONANCE
SPECTRA
STORAGE RINGS
SYNCHROTRONS