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

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arxiv nucl-ex/0510056 v2 pith:V2ZKGVIP submitted 2005-10-20 nucl-ex

A. Wronska , V. Hejny , C. Wilkin , S. Dymov , C. Hanhart , V. Komarov , H. R. Koch , A. Kulikov
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A. Magiera T. Mersmann S. Mikirtytchiants H. Ohm D. Prasuhn R. Schleichert H. J. Stein H. Stroeher
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keywords alphabeenhighernearpartialreactionthresholdamplitudes
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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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