Measurement of the dp -->3He eta reaction near threshold

Abstract

Total and differential cross sections for the dp --> 3He eta reaction have been measured near threshold for 3He center-of-mass momenta in the range from 17.1 MeV/c to 87.5 MeV/c. The data were taken during a slow ramping of the COSY internal deuteron beam scattered on a proton target detecting the 3He ejectiles with the COSY-11 facility. The forward-backward asymmetries of the differential cross sections deviate clearly from zero for center-of-mass momenta above 50 MeV/c indicating the presence of higher partial waves in the final state. Below 50 MeV/c center-of-mass momenta a fit of the final state enhancement factor to the data of the total cross sections results in the 3He eta scattering length of a = |2.9 +/- 0.6| + i (3.2 +/- 0.4) fm.

References in corpus (16)

• Big-Bang nucleosynthesis (Particle Data Group mini-review)
• The Cosmological Parameters 2006
• Photoproduction of eta-mesic 3He
• Near-Threshold Production of $\eta$-Mesons
• Eta bound states in nuclei: a probe of flavour-singlet dynamics
• ${\eta }^{\prime }$ production in proton-proton scattering close to threshold}
• Near-Threshold eta Meson Production in Proton-Proton Collisions
• Experimental study of pp eta dynamics in the pp --> ppeta reaction
• eta-Nucleon Scattering Length and Effective Range uncertainties
• Dependence of calculated binding energies and widths of $\eta$-mesic nuclei on treatment of subthreshold $\eta$-nucleon interaction
• Measurement of p + d -> 3He + eta in S(11) Resonance
• Monitoring of the accelerator beam distributions for internal target facilities
• Comment on 'Photoproduction of $\eta$--Mesic ${}^3$He'
• Drift chamber with a c-shaped frame
• The $\eta {-}^3$He scattering length revisited
• A method to disentangle single- and multi-meson production in missing mass spectra from quasi-free pn --> pn X reactions

Cited by in corpus (61)

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• Eta-mesic nuclei: past, present, future
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• Coherent π0η photoproduction on s-shell nuclei
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• Non-Strange Meson Production with Hadronic Probes
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