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

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

2007-01-29

arxiv.org/abs/nucl-ex/0701072v1

Phys.Rev.Lett.98:242301,2007

Physics

Nuclear Physics

Nuclear Experiment

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

Scientific paper

10.1103/PhysRevLett.98.242301

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.

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