Detailed study of the ground state properties of the newly found nuclide Ni-48 in relativistic mean-field theory

We investigated in detail the ground state properties of the newly discover ed doubly magic nucleus Ni-48 (1)) in the framework of relativistic mean-fi eld (RMF) theory with various parameter sets. Calculations show that this n ucleus is a bound nucleus, because both of its proton separation energies a re positive and its single particle levels are bound. This agrees with an e xperimental result.(1)) The calculated two-proton separation energy for Ni- 48 is found to be very close to the estimated value from the same experimen t.(1)) The RMF calculations also show that the proton-rich nucleus 48Ni is spherical and Z = 28 is a good magic number. The variation of the spin-orbi t splittings with proton excess is discussed in the context of RMF theory.