Research on Excited States in N=127 Isotones with Relativistic Mean Field Theory

Key words: 
• relativistic mean field /
• isotone /
• halo in excited state

Abstract: Properties of the ground state and the excited states in N=127 isotones are investigated with relativistic mean field theory with　 the interactions PK1 and　 NL3. By analyzing the rms of proton and neutron， the single particle levels of valence nucleon and the density distributions of neutron， proton and the last neutron， it can be found that there exists a neutron halo in the excited states of 3d_5/2，4s_1/2 and 3d_3/2. It is also predicted that there exists 　a neutron halo in the excited states of 3d_5/2，4s_1/2 and 3d_3/2 in ²⁰⁷Hg，²⁰⁸Tl，²¹⁰Bi and ²¹¹Po.