Search for the eta-mesic Helium bound state with the WASA-at-COSY facility

Abstract

We performed a search for 4He-eta bound state with high statistics and high acceptance with the WASA-at-COSY facility using a ramped beam technique. The signature of eta-mesic nuclei is searched for in dd -> 3Henpi0 and dd -> 3Heppi- reactions by the measurement of the excitation functions in the vicinity of the η production threshold. This paper presents the experimental method and the preliminary results of the data analysis for dd -> 3Henpi0 process.

Proceedings from the 12th International Conference on Nucleus-Nucleus Collisions (NN2015), Catania 2015, June 21-26