系统地研究“颈”发射过程中的中等质量碎片 ,能使我们更好地理解中能核反应的动力学和热力学性质 .采用具有不同的同位旋靶核研究了靶同位旋与中等质量碎片的关系 ,以及区分反应过程中类弹、类靶产生的中等质量碎片和“颈”发射过程中产生的中等质量碎片 A systematic study of medium-mass fragments during the “neck” launch allowed us to better understand the kinetic and thermodynamic properties of mid-energy nuclear reactions. The relationship between the target isospin and medium-quality debris was studied using different isobaric target nuclei , As well as to distinguish between medium-quality debris produced by the type bombs and target during the reaction and medium-quality fragments produced during the “neck” launch