Abstract

Two methods of the luminosity determination for the experiment performed by WASA collaboration to search for 4 He- bound state are presented. During the measurement the technique of continous change of the beam momentum in one accelerator cycle (called ramped beam) was applied. This imposes the requirement to determine not only the total integrated luminosity, but also its variation as a function of the beam momentum.

Highlights

  • The existence of η-mesic nuclei in which the η meson is bound within a nucleus via the strong interaction was postulated in 1986 by Haider and Liu [1]

  • In order to calculate the total integrated luminosity, the number of events, efficiency, as well as cross section were determined for 5 intervals of cos θ∗ in the range from 0.88 to 0.98 and 5 intervals of excess energy Q in the range from −70 MeV to 30 MeV corresponding to the angular range of the reaction and the beam momentum ramping, respectively

  • We carried out the luminosity determination for the experiment performed with WASA-at-COSY to search for the 4He–η bound states in deuteron–deuteron fusion

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Summary

Introduction

The existence of η-mesic nuclei in which the η meson is bound within a nucleus via the strong interaction was postulated in 1986 by Haider and Liu [1]. The total integrated luminosity is determined based on the dd → 3Hen and quasi free pp → pp reactions for which the cross sections were already experimentally established. The absolute value of the integrated luminosity was determined using the experimental data on the dd → 3Hen cross sections measured by the SATURNE Collaboration for four beam momenta in the range between 1.65 and 2.49 GeV/c [34]. In order to calculate the total integrated luminosity, the number of events, efficiency, as well as cross section were determined for 5 intervals of cos θ∗ in the range from 0.88 to 0.98 and 5 intervals of excess energy Q in the range from −70 MeV to 30 MeV corresponding to the angular range of the reaction and the beam momentum ramping, respectively.

Luminosity dependence on the excess energy
Findings
Summary

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