New neutron magic number N = 16 for neutron-rich nuclei
A breaking of magicity has already been observed at the N = 20 shell closure where an “island of inversion” in shell ordering has been shown to exist. However, until lately no experimental evidence about magic numbers, substituting N = 20, was available. Recently, we have surveyed  two experiments performed at GANIL from the point of view of the importance of two-neutron separation energies for determination of neutron shells in this region.
PACS21.10.Dr Binding Energies and Masses 27.30.+t 20 ≤ A ≤ 38
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