Role of the Landau-Migdal Parameters with the Pseudovector and the   Tensor Coupling in Relativistic Nuclear Models -- The Quenching of the   Gamow-Teller Strength --
  Role of the Landau-Migdal parameters with the pseudovector ($g_a$) and the tensor coupling ($g_t$) is examined for the giant Gamow-Teller (GT) states in the relativistic random phase approximation (RPA). The excitation energy is dominated by both $g_a$ and $g_t$ in a similar way, while the GT strength is independent of $g_a$ and $g_t$ in the RPA of the nucleon space, and is quenched, compared with that in non-relativistic one. The coupling of the particle-hole states with nucleon-antinucleon states is expected to quench the GT strength further through $g_a$. 
Tomoyuki Maruyama, Haruki Kurasawa, Toshio Suzuki