COSY-11: an experimental facility for studying meson production in free and quasi-free nucleon-nucleon collisions

TL;DR

The COSY-11 facility at Juelich is an experimental setup designed to study meson production in free and quasi-free nucleon-nucleon collisions, with recent upgrades enabling spin and isospin investigations.

Contribution

This paper introduces the COSY-11 experimental setup and its recent extensions for studying meson production with polarization and isospin sensitivity.

Findings

Successful measurement of outgoing protons and neutrons in meson production reactions.

Enhanced capability to investigate spin and isospin dependence in nucleon-nucleon collisions.

Extended experimental setup improves data quality for meson production studies.

Abstract

The COSY-11 experimental setup is an internal facility installed at the COoler SYnchrotron COSY in Juelich. It allows to investigate meson production in free and quasi-free nucleon-nucleon collisions, eg. pp --> pp meson and pd --> p_sp np meson reactions. Drift chambers and scintillators permit to measure outgoing protons, separated in magnetic field of COSY-11 dipole. Neutrons are registered in the neutron modular detector installed downstream the beam. Recently, the experimental setup has been extended with spectator detector, deuteron drift chamber and polarization monitoring system, and since then meson production can be investigated also as a function of spin and isospin of colliding nucleons.