SOUND-LIKE COLLECTIVE MODE EXCITATION WITH PION ABSORPTION IN NUCLEAR MATTER
核物质里π介子的吸收与类声集体模式的激发

The relativistic mean field theory consistent with bulk properties of nuclear matter is extended to study the excitations of the sound-like collective modes in nuclear matter. Corresponding relativistic mean field equations are solved numerically and self-consis-tently. The effective mass of nucleon the speed of the sound and the amplitude of the sound-like solution are calculated. When the nuclear density is near or greater than the saturation density, the sound-like non-trivial solution could be found.