中能区~（40）Ar＋~（197）Au反应中轻粒子的发射时间测量

Abstract

本文报道了２５ＭｅＶ／ｕ４０Ａｒ＋１９７Ａｕ反应中粒子－粒子关联函数的实验结果．利用三体弹道模型从关联函数提取了轻粒子发射时间．轻粒子的平均发射时间随粒子能量而变化，从低能时的约３００ｆｍ／ｃ下降至高能时的约１００ｆｍ／ｃ．Particle-particle correlation functions have been measured for 40Ar+197Au collisions at E=25 MeV/u.Emission time of light particles has been extracted from correlation functions using the three-body trajectory model.The average emission time varies with the energy of particles. It decreases from about 300 fm/c for low energy particles to about 100fm/c for energetic particles.国家自然科学基金,中国科学院留学经费择优支持基