1. Precision study of the eta-3He system using the d+p->3He+eta reaction
- Author
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Mersmann, T., Alfons Khoukaz, Maeda, Y., Mielke, M., Mikirtychiants, S., Ohm, H., Papenbrock, M., Prasuhn, D., Rathmann, F., Rausmann, T., Schleichert, R., Serdyuk, V., Büscher, M., Stein, H. -J, Ströher, H., Täschner, A., Valdau, Yu, Wilkin, C., Wronska, A., Chiladze, D., Dymov, S., Hartmann, M., Hejny, V., Kacharava, A., Keshelashvili, I., and Kulessa, P.
- Subjects
hadroproduction [eta] ,experimental results [magnetic spectrometer] ,missing-mass [mass spectrum] ,partial wave ,+helium-3+eta%22">deuteron p --> helium-3 eta ,Juelich COSY PS ,energy dependence [channel cross section] ,exclusive reaction [p deuteron] ,angular dependence ,ddc:550 ,threshold ,momentum dependence [asymmetry] ,scattering length [eta nucleus] ,Nuclear Experiment ,nuclide [helium] - 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., Comment: 4 pages, 4 figures, 1 table, submitted to Phys. Rev. Lett
- Published
- 2007
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