The European Physical Journal A The European Physical Journal A, Springer, 2020, 56 (3), pp.101. ⟨10.1140/epja/s10050-020-00109-9⟩ Eur.Phys.J.A Eur.Phys.J.A, 2020, 56 (3), pp.101. ⟨10.1140/epja/s10050-020-00109-9⟩ European Physical Journal A European Physical Journal A, EDP Sciences, 2020, 56 (3), pp.101. ⟨10.1140/epja/s10050-020-00109-9⟩