Status of the X17 search in Montreal. Issue 1 (1st December 2022)

• Record Type: Journal Article
• Authors: Azuelos, G.; Bryman, D.; Chen, W.C.; de Luz, H.; Doria, L.; Gupta, A.; Hamel, L-A.; Laurin, M.; Leach, K.; Lefebvre, G.; Martin, J-P.; Robinson, A.; Starinski, N.; Sykora, R.; Tiwari, D.; Wichoski, U.; Zacek, V.
• Is Part Of: Journal of physics. Volume 2391 Issue 1(2022)
• Publication Date: 2022-12-01
• Subjects: Physics -- Congresses; 530.5
• DOI: 10.1088/1742-6596/2391/1/012008
• Languages: English
• ISSNs: 1742-6588

Abstract

Abstract: At the Montreal Tandem accelerator, an experiment is being set up to measure internal pair creation from the decay of nuclear excited states using a multiwire proportional chamber and scintillator bars surrounding it from the Daphne experiment. The acceptance covers a solid angle of nearly 4π. Preamplifiers and the data acquisition hardware have been designed and tested. The 7 LiF target, mounted on an Al foil and water-cooled is in a thin carbon fiber section of the beamline. The experiment will focus at first on a measurement of the internal pair creation from the 18.15 MeV state of 8 Be with the aim of observing independently the X17 particle discovered by the ATOMKI experiment. Assuming the ATOMKI evaluation of the electron-pair production rate from X17, Geant4 simulation predicts observation of a clear signal after about 2 weeks of data taking with 2 μ A proton beam. The IPC measurement could eventually be extended to the giant dipole resonance of 8 Be, as well as to other nuclei, in particular to 10 B.