Enhancement of low-${m_t}$ kaons in AGS heavy-ion collisions
  In the relativistic transport model, we show that the recently observed enhancement of low-$m_t$ kaons ($K^+$ and $K^-$) in Si+Pb collisions at AGS can be explained if a density isomer is introduced in the nuclear equation-of-state. 
G. Q. Li and C. M. Ko