Spectroscopy of $^{18}$Na: Bridging the two-proton radioactivity of $^{19}$Mg
M. Assi\'e, F. de Oliveira Santos, T. Davinson, F. de Grancey, L., Achouri, J. Alc\'antara-N\'u\~nez, T. Al Kalanee, J.-C. Ang\'elique, C., Borcea, R. Borcea, L. Caceres, I. Celikovic, V. Chudoba, D.Y. Pang, C., Ducoin, M. Fallot, O. Kamalou, J. Kiener, Y. Lam
TL;DR
This study investigates the unbound nucleus $^{18}$Na through resonant elastic scattering to understand its role in the two-proton radioactivity of $^{19}$Mg, revealing insights into decay mechanisms.
Contribution
The paper provides new spectroscopic data on $^{18}$Na and demonstrates its significance in explaining $^{19}$Mg's two-proton radioactivity via sequential decay.
Findings
Spectroscopic properties of $^{18}$Na's low-lying states were determined.
The lifetime of $^{19}$Mg's radioactivity is consistent with sequential proton emission.
Resonance analysis supports the decay pathway involving $^{18}$Na resonances.
Abstract
The unbound nucleus Na, the intermediate nucleus in the two-proton radioactivity of Mg, was studied by the measurement of the resonant elastic scattering reaction Ne(p,Ne)p performed at 4 A.MeV. Spectroscopic properties of the low-lying states were obtained in a R-matrix analysis of the excitation function. Using these new results, we show that the lifetime of the Mg radioactivity can be understood assuming a sequential emission of two protons via low energy tails of Na resonances.
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