Abstract
Measurement of the in-medium modifications of theresonance, signatures of the excitation of nuclear collective states and the first experimental evidence for a thermal emission of photons have been obtained from the analysis of new � ± 4 He data at T� =106 MeV at PAINUC with the PAINUC experiment at JINR. Experimental limits on the direct measurement of the muon neutrino mass is also being studied: the pion mass resolution, at present 350 eV, heavily constrains the accessible msector above 419 keV/c 2 .
Highlights
The PAINUC experiment has collected new data on elastic and inelastic π± 4He interaction, at Tπ =106 MeV where the measured maximum excitation of the ∆ resonance on 4He has been observed
The events have been collected using a triggerable self shunted streamer chamber [1] filled with helium at atmospheric pressure, installed at the Joint Institute for Nuclear Research (JINR) in Dubna (Russia)
The analysis of π±4He scattering events at Tπ ∼106 MeV revealed the existence of a channel with the emission of a high energy photon in the final state
Summary
The PAINUC experiment has collected new data on elastic and inelastic π± 4He interaction, at Tπ =106 MeV where the measured maximum excitation of the ∆ resonance on 4He has been observed. The events have been collected using a triggerable self shunted streamer chamber [1] filled with helium at atmospheric pressure, installed at the Joint Institute for Nuclear Research (JINR) in Dubna (Russia). 10 MeV, where other detectors start to show their limitations, the used technique has allowed to collect information on nuclear collective states and on the physics of phase transitions
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