Near threshold eta meson production in the d+d->alpha+eta reaction

Details Near threshold eta meson production in the d+d->alpha+eta reaction Near threshold eta meson production in the d+d->alpha+eta reaction

2005-10-20

arxiv.org/abs/nucl-ex/0510056v2

Eur.Phys.J.A26:421-428,2005

Physics

Nuclear Physics

Nuclear Experiment

8pp, fig.3 added, normalisation in eq.4.1 corrected

Scientific paper

10.1140/epja/i2005-10185-0

The d+d->alpha+eta reaction has been investigated near threshold using the ANKE facility at COSY-Juelich. Both total and differential cross sections have been measured at two excess energies, Q=2.6 MeV and 7.7 MeV, with a subthreshold measurement being undertaken at Q=-2.6 MeV to study the physical background. While consistent with isotropy at the lower energy, the angular distribution reveals a pronounced anisotropy at the higher one, indicating the presence of higher partial waves. Options for the decomposition into partial amplitudes and their consequences for determination of the s-wave eta-alpha scattering length are discussed.

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