Data availabilityThe data used in this work originate from experiment 168 at RIKEN RIBF. The raw data are available on request.Code availabilityThe code used to analyse the data is available on reasonable request.ReferencesGamow, G. Quantum theory of the atomic nucleus. Z. Phys. 51, 204–212 (1928).Article

Google Scholar

Gurney, R. W. & Condon, E. U. Quantum mechanics and radioactive disintegration. Phys. Rev. 33, 127–140 (1929).Article

Google Scholar

Rasmussen, J. O. Alpha-decay barrier penetrabilities with an exponential nuclear potential: even-even nuclei. Phys. Rev. 113, 1593–1598 (1959).Article