Precision study of the eta-3He system using the d+p->3He+eta reaction

Abstract

The differential and total cross sections for the d+p->3He+eta reaction have been measured in a high precision high statistics COSY-ANKE experiment near threshold using a continuous beam energy ramp up to an excess energy Q of 11.3 MeV with essentially 100% acceptance. The kinematics allowed the mean value of Q to be determined to about 9 keV. Evidence is found for the effects of higher partial waves for Q>4 MeV. The very rapid rise of the total cross section to its maximum value within 0.5 MeV of threshold implies a very large eta-3He scattering length and hence the presence of a quasi-bound state extremely close to threshold.

4 pages, 4 figures, 1 table, submitted to Phys. Rev. Lett

References in corpus (5)

• Photoproduction of eta-mesic 3He
• Near-Threshold Production of $\eta$-Mesons
• Measurement of the dp -->3He eta reaction near threshold
• Near threshold eta meson production in the d+d->alpha+eta reaction
• Measurement of p + d -> 3He + eta in S(11) Resonance

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