One—Proton Halo in ^31Cl with Relativistic Mean—Field Theory

We investigate proton-rich isotopes ^31,32Cl using the nonlinear relativistic mean-field model.It is shown that this model can reproduce the properties of these nuclei well.A long tail appears in the calculated proton density distribution of ^31Cl.The results of relativistic density-dependent Hartree theory show a similar trend of tail density distribution.It is strongly suggested that there is a proton halo in ^31Cl and it is indicated that there may be a proton skin in ^32Cl.The relation between the proton halo in ^31Cl and the new proton magic number is discussed.