High-statistics measurement of the $\beta$ -delayed $\alpha$ spectrum of 20Na

Abstract

A measurement of the 20 Na β-delayed alpha spectrum with a high-granularity set-up has allowed the decay scheme to be revised on several points. Three new transitions of low intensity are found at low α-particle energy. An R-matrix fit of the complete spectrum gives an improved description of the decay and indicates feeding to the broad 2 + α-cluster state close to 9 MeV.

Systematic trends in beta-delayed particle emitting nuclei: The case ofβpαemission from 21 Mg

“…The α 2 , α 3 , α 4 and α 5 lines naturally fit into the 21 Mg scheme put forward in [3] as βdelayed single α branches (see [3] for the full decay scheme). The α 1 line, with measured laboratory energy 714(12) keV, does not fit with a transition between known levels in 21 Na and 17 F. However, it does agree with a known α-particle transition from 20 Ne to 16 O observed in the decay of 20 Na [7] with a laboratory energy of 714(4) keV.…”