footnote
Last modification: 1996/3/26
This paper is mainly concerned with the proton-rich nuclei than the
neutron-rich ones. We thoroughly explore the proton-rich side, even to
beyond the proton drip line by several neutrons, while restricting the
investigations in the neutron-rich side within the experimental
frontier plus a few neutrons. This is because the HF+BCS method used
in this paper cannot correctly include the coupling in the pairing
channel with the continuum, which can be influential in nuclei near
the neutron drip line [DFT84,DHN94]. The HF+BCS method including the
coupling with the continuum gives rise to unphysical neutron gas
surrounding the nucleus. The solution of this problem requires the
Hartree-Fock-Bogolyubov method, with which ordinary and pair densities
are spatially localized when the Fermi level is at a negative energy
[DFT84]. On the other hand, for nuclei near the proton drip line, the
HF+BCS method is still applicable in practice to obtain localized
solutions because the Coulomb barrier confines the wavefunctions of
low-and-positive as well as negative energy levels.