Schematic decay schemes of examples of α–X-ray coincidence measurements. The assignment of the element number of the evaporation residues (ER) at the beginning of the α-decay chains is ambiguous in (a) and (b). It is unambiguous in (c). Note, that a possible X-ray emitted from the nucleus (Z–3, A–5) in a) is not in prompt coincidence with α1 and, therefore, difficult to determine. In all three cases the compound nuclei (CN) have the same A and Z values.