在相对论平均场模型框架下研究了有限核的同位旋单极模式激发。本工作首次用非线性模型计算了无规位相近似下的响应函数。计算表明:通常采用非线性模型的有效Lagrangians得到的不可压缩性系数约在280～350MeV范围内,可以给出中重核和重核的呼吸模式能量的合理描述。尽管NL1参数 In the framework of the relativistic mean field model, we study the isomorphic monopole mode excitation of finite nuclei. For the first time, the nonlinear model is used to calculate the response function with no phase approximation. Calculations show that the effective incompressibility coefficients of effective Lagrangians using the nonlinear model are approximately in the range of 280-350 MeV, which can give a reasonable description of the energy of the breathing modes of the middle and heavy nuclei. Despite NL1 parameters