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DTSTART:20250330T010000
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DTSTART;TZID=Europe/Rome:20250917T143000
DTEND;TZID=Europe/Rome:20250917T160000
DTSTAMP:20260510T070445
CREATED:20250905T104405Z
LAST-MODIFIED:20250905T104405Z
UID:39534-1758119400-1758124800@w3.lnf.infn.it
SUMMARY:Search for the X17 particle in the 7Li (p\, e+e-) 8 Be process with MEG II
DESCRIPTION:Speaker: Gianluca Cavoto (Istituto Nazionale di Fisica Nucleare) \nThe observation of a resonance structure in the opening angle of the electron-positron pairs in the 7Li(p\,e+e−)8Be reaction was claimed and interpreted as the production and subsequent decay of a hypothetical particle (X17). Similar excesses\, consistent with this particle\, were later observed in processes involving 4He and 12C nuclei with the same experimental technique. \nThe MEG-II apparatus at PSI\, designed to search for the µ+ → e+ γ decay\, can be exploited to investigate the existence of this particle and study its nature. Protons from a Cockroft-Walton accelerator\, with an energy up to 1.1 MeV\, were delivered on a dedicated Li-based target. The γ and the e+ e− pair emerging from the 8Be transitions were studied with calorimeters and a spectrometer\, featuring a broader angular acceptance than previous experiments. \nIn this seminar we present the analysis and the result of a four-week data-taking in 2023 with proton energy varying from 400 keV to 1080 keV\, resulting in the excitation of two different resonances with Q-value 17.6 MeV and 18.1 MeV.
URL:/event/search-for-the-x17-particle-in-the-7li-p-ee-8-be-process-with-meg-ii/
LOCATION:Aula Salvini
CATEGORIES:Seminari generali
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