\b{eta}-delayed three-proton decay of 31Ar
A.A. Lis, C. Mazzocchi, W. Dominik, Z. Janas, M. Pf\"utzner, M., Pomorski, L. Acosta, S. Baraeva, E. Casarejos, J. Du\'enas-D\'iaz, V. Dunin,, J. M. Espino, A. Estrade, F. Farinon, A. Fomichev, H. Geissel, A. Gorshkov,, G. Kami\'nski, O. Kiselev, R. Kn\"obel, S. Krupko, M. Kuich
TL;DR
This study investigates the beta decay of 31Ar, revealing a rare three-proton emission branch with a branching ratio of 0.07%, using a gaseous time projection chamber for detailed decay event recording.
Contribution
First observation of beta-delayed three-proton decay in 31Ar with precise measurement of its branching ratio.
Findings
Beta-delayed one and two-proton emissions confirmed.
Clear evidence of beta-delayed three-proton decay.
Branching ratio for three-proton decay measured as 0.07%.
Abstract
The beta decay of 31Ar, produced by fragmentation of a 36Ar beam at 880 MeV/nucleon, was investigated. Identified ions of 31Ar were stopped in a gaseous time projection chamber with optical readout allowing to record decay events with emission of protons. In addition to \b{eta}-delayed emission of one and two protons we have clearly observed the beta-delayed three-proton branch. The branching ratio for this channel in 31Ar is found to be 0.07(2)%.
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