Study of the near threshold total cross sesctions for the quasi-free pn-->pn eta prime reaction with the COSY-11 detector

TL;DR

This study measures the near-threshold total cross sections for the quasi-free pn-->pn eta prime reaction using the COSY-11 detector, focusing on detector efficiency and setting upper limits due to low statistics.

Contribution

It provides an analysis of the neutron detector's functioning and efficiency in measuring eta prime production near threshold energies.

Findings

Upper limits for cross sections were established.

Neutron detector efficiency was characterized.

Energy dependence of the cross section was analyzed.

Abstract

The measurement of the quasi-free production of the eta prime meson has been carried out at the COSY-11 detection setup using a proton beam and a deuteron cluster target. The energy dependence of the cross section is extracted using a fixed proton beam momentum of p_beam=3.35 GeV/c and exploiting the Fermi momenta of nucleons inside deuterons. The data cover a range of centre-of-mass excess energies from 0 to 24 MeV. Due to the low statistics at the present stage only upper limits for the cross sections could be extracted. In this article we focus on the functioning and efficiency determination of the neutron detector.