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Precision study of the eta3He system using the dp--> 3Heeta reaction.

T Mersmann,A Khoukaz,M Büscher,D Chiladze,S Dymov,M Hartmann,V Hejny,A Kacharava,I Keshelashvili,P Kulessa,Y Maeda,M Mielke,S Mikirtychiants,H Ohm,M Papenbrock,D Prasuhn,F Rathmann,T Rausmann,R Schleichert,V Serdyuk,H-J Stein,H Ströher,A Täschner,Yu Valdau,C Wilkin,A Wrońska

Physical review letters（2007）

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Abstract
The differential and total cross sections for the dp--> 3Heeta 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 >or= 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 eta3He scattering length and hence the presence of a quasibound state extremely close to threshold.
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