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HK: Fachverband Physik der Hadronen und Kerne

HK 36: Structure and Dynamics of Nuclei 8

HK 36.1: Gruppenbericht

Dienstag, 24. März 2015, 17:00–17:30, T/HS2

Nucleon-nucleon scattering studies at small angles at COSY-ANKE — •Zara Bagdasarian for the ANKE collaboration — Forschungszentrum Jülich, Jülich, Germany — Tbilisi State University, Tbilisi, Georgia

The most accepted approach to describe nucleon-nucleon (NN) interaction is the partial wave analysis (PWA). The SAID database and analysis program comprise various experimental observables at different energies over the full angular range and express them in the partial waves. The goal of the experiments held at COSY-Jülich is to provide SAID with new valuable measurements. Scattering data was taken at small angles for six beam energies between 0.8 and 2.4 GeV with polarized proton beam incident on both proton and deuteron unpolarized targets using the ANKE spectrometer. First, the results of the proton-proton (pp) scattering analyzing power and cross section are presented. While pp data closes a very important gap at small angles in the database, proton-neutron (pn) data is a crucial contribution to the almost non-explored pn database above 800 MeV. Therefore, the talk will mainly concentrate on the proton-deuteron (pd) scattering studies, which includes the overview of the older COSY experiments with polarized deuteron beam, and the abovementioned new experiment with polarized proton beam and unpolarized deuteron target. The presentation will show the most recent results of the analyzing powers of pd elastic and pn scattering.