$\ensuremath{\beta}$-delayed three-proton decay of $^{31}\mathrm{Ar}$

$β$ -delayed three-proton decay of ${}^{31}{Ar}$

A. A. Lis et al.

Phys. Rev. C 91, 064309 – Published 16 June 2015

Abstract

The $β$ decay of ${}^{31}{Ar}$ , produced by fragmentation of an ${}^{36}{Ar}$ beam at 880 MeV/nucleon, was investigated. Identified ions of ${}^{31}{Ar}$ were stopped in a gaseous time projection chamber with optical readout allowing us to record decay events with emission of protons. In addition to $β$ -delayed emission of one and two protons we clearly observed the $β$ -delayed three-proton branch. The branching ratio for this channel in ${}^{31}{Ar}$ is found to be $0.07 \pm 0.02$ %.