Abstract
We present a review of experimental studies on the properties of extremely neutronrich nuclei (Z=6–20, A=20–60) near the neutron drip line. Recent data on mass measurements of neutron-rich nuclei at GANIL (Caen, France) and some characteristics of binding energies in this region are discussed. Being sensitive to the existence of nuclear shells separation energies S2n together with the evidence of particle instability of doubly magic nuclei 10He and 28O could provide information on changes in shell closures. Particularly opening of an N=16 shell and vanishing of the N=20 shell for very neutron-rich isotopes is under discussion. Decay studies of these hardly accessible short-lived neutronrich nuclei from oxygen to silicon using the in-beam γ-ray spectroscopy are also reported.
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