Cross Section and Tensor Analysing Power of the $\vec{d}d\to ηα$ Reaction Near Threshold

Details Cross Section and Tensor Analysing Power of the $\vec{d}d\to ηα$ Reaction Near Threshold Cross Section and Tensor Analysing Power of the $\vec{d}d\to ηα$ Reaction Near Threshold

2008-11-20

arxiv.org/abs/0811.3372v1

Nucl.Phys.A821:193-209,2009

Physics

Nuclear Physics

Nuclear Experiment

20 pages, 11 figures

Scientific paper

10.1016/j.nuclphysa.2009.02.004

The angular distributions of the unpolarised differential cross section and tensor analysing power $A_{xx}$ of the $\vec{d}d\to\alpha \eta$ reaction have been measured at an excess energy of 16.6 MeV. The ambiguities in the partial-wave description of these data are made explicit by using the invariant amplitude decomposition. This allows the magnitude of the s-wave amplitude to be extracted and compared with results published at lower energies. In this way, firmer bounds could be obtained on the scattering length of the $\eta \alpha$ system. The results do not, however, unambiguously prove the existence of a quasi-bound $\eta \alpha$ state.

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