Energy Levels of 20Al

TL;DR

This paper evaluates experimental nuclear data for 20Al, a recently discovered unbound nucleus, detailing its decay modes and energy levels based on recent reaction analysis.

Contribution

It provides the first evaluation of 20Al's nuclear structure, including decay pathways and energy levels, based on recent experimental data.

Findings

20Al is 3p-unbound and was recently observed.

Its ground state decays via one-proton emission.

Decay pathways include decay to 19Mg and 17Ne+2p.

Abstract

Experimental nuclear structure data are evaluated for 20Al. The 3p-unbound, previously unobserved 20Al nucleus was recently discovered by (2025Xu03) through the analysis of the (2007Mu15: 9Be(20Mg,9Mg)) data. (2025Xu03) analyzed the by-product 9Be(20Mg,20 Al) charge exchange reaction channel followed by an in-flight decay of 20Al. The ground state of 20Al decays by one-proton emission to the ground state of 19Mg , which is also particle unbound and democratically decays to 17Ne(g.s.)+2p.