Abstract
The reaction dp → 3 He η has been investigated at the COSY-ANKE experiment with both an unpolarised and a vector/tensor polarised deuteron beam in an excess energy range of Q = 0 MeV up to Q = 10 MeV. The determination of the tensor analysing power t 20 along with the unpolarised cross section allows for the investigation of the s -wave production amplitudes near threshold. The weak energy dependence of t 20 supports a strong final state interaction of the η 3 He system which might lead to a quasi-bound η-mesic state. Furthermore, the angular dependence of the t 20 might reveal further insight into the production amplitude.
Highlights
The reaction dp → 3He is known for the anomalous behaviour of its total cross section near the production threshold
The reaction dp → 3He has been investigated at the COSY-ANKE experiment with both an unpolarised and a vector/tensor polarised deuteron beam in an excess energy range of Q = 0 MeV up to Q = 10 MeV
Detailed measurements at the COSY-ANKE spectrometer provided a rich data sample consisting of 195 total cross sections within the first 11 MeV of excess energy Q as well as differential cross sections [1]
Summary
The reaction dp → 3He is known for the anomalous behaviour of its total cross section near the production threshold. A description of this excitation function was possible by assuming a pole in the production amplitude near threshold and this behaviour was attributed to a very strong final state interaction [5]. A suitable observable to this is found in the tensor analysing power t20, which can be determined by measuring the reaction with a tensor polarised deuteron beam
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