DPG Phi
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Dresden 2013 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 14: Hadronenstruktur und -spektroskopie

HK 14.3: Talk

Monday, March 4, 2013, 17:30–17:45, WIL-C307

Measurement of the spin correlation coefficients Ax,x and Ay,y in the pn→ {pp}s π reaction near the threshold at ANKE-COSY — •Vera Shmakova — DLNP, JINR, Joliot-Curie 6, 141980 Dubna, Moscow region, Russia — Institut für Kernphysik, Forschungszentrum Jülich, 52425 Jülich, Germany

A double polarization measurement of the spin correlation coefficients Ax,x and Ay,y of the pn→ {pp}s π process near the threshold has been performed at the ANKE-COSY spectrometer (Jülich). These results will facilitate further development of χ PT in the NNNNπ sector.

The transversely vector polarized deuteron beam and the hydrogen internal polarized ANKE target were used in the experiment. The pddπ0 process data were recorded concurrently and used for beam and target polarimetry. To increase the target thickness, the polarized target was equipped with a storage cell, and the beam interaction with the cell was the main source of background events. Dedicated expositions with no gas in the cell and with the cell filled with N2 gas, were taken to study the backgrounds. The results of the experiment and the data analysis procedure and will be presented. The future experimental program aiming to study the pN→ {pp}s π reaction with the use of longitudinally polarized beams will be discussed.

Supported by the COSY-FFE program.

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