Development of the Neck in Fusion Reactions ^40Ca＋^90,96Zr

The neck dynamics and nucleon transfer through the neck in fusion reactions ^40Ca ^90,96Zr are studied by applyingthe improved quantum molecular dynamics model. A special attention is paid to the dynamic behaviour of the neck development at touching point and to the contribution of excess neutrons in a neutron-rich target (or projectile) to neck formation and nucleon transfer.