%X The differential and total cross sections for the dp -> He-3 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 greater than or similar to 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 He-3 scattering length and hence the presence of a quasibound state extremely close to threshold.
%O © 2007 The American Physical Society
%I AMERICAN PHYSICAL SOC
%L discovery154172
%J PHYS REV LETT
%K NEAR-THRESHOLD, ETA, SCATTERING
%D 2007
%V 98
%A T Mersmann
%A A Khoukaz
%A M Buscher
%A D Chiladze
%A S Dymov
%A M Hartmann
%A V Hejny
%A A Kacharava
%A I Keshelashvili
%A P Kulessa
%A Y Maeda
%A M Mielke
%A S Mikirtychiants
%A H Ohm
%A M Papenbrock
%A D Prasuhn
%A F Rathmann
%A T Rausmann
%A R Schleichert
%A V Serdyuk
%A HJ Stein
%A H Stroher
%A A Taschner
%A Y Valdau
%A C Wilkin
%A A Wronska
%T Precision study of the eta He-3 system using the dp -> He-3 eta reaction
%N 24