New magic number, N=16, near the neutron drip-line

The neutron separation energies (Sn) and the interaction cross-sections (σI) for the neutron-rich p-sd and sd shell region have been surveyed in order to search for a new magic number. Very recently, both measurements have reached up to the neutron drip-line, or close to the drip-line, for nuclei of Z·8. The neutron-number (N) dependence of Sn shows clear breaks at N=16 near to the neutron drip-line, which shows the creation of a new magic number. A neutron number dependence of σI shows a large increase of σI for N=15, which supports the new magic number. The origin and influence of the new magic number are also discussed. (author)