用He 离子诱导的裂变激发函数探测核摩擦强度(英文)

Nuclear Friction Determined with He-ion Induced Fission Excitation Functions

摘要: 随机模型被用于分析³He+¹⁹⁷Au，³He+²⁰⁸Pb 和³He¹⁸⁶W反应测量的裂变激发函数。提取的鞍点前摩擦强度约为4x10²¹ s^-1。揭示了能级密度参数的大小在约束核摩擦强度中的作用。计算表明，高激发条件能能显著增强裂变截面对核耗散的敏感性。The stochastic approach to ssion is employed to analyze measured ssion excitation functions in the reactions ³He+¹⁹⁷Au, ³He+²⁰⁸Pb and ³He+¹⁸⁶W. A pre-saddle friction strength of about 4 x 10²¹ s^-1is extracted by comparing theoretical calculations with experimental data. The important role of level-density parameters in accurately determining the strength of nuclear friction is revealed.It is further shown that high-energy conditions can enhance the sensitivity of ssion cross sections to nuclear dissipation.

Abstract: The stochastic approach to ssion is employed to analyze measured ssion excitation functions in the reactions 3He+197Au, 3He+208Pb and 3He+186W. A pre-saddle friction strength of about 4 x 10²¹ s^-1is extracted by comparing theoretical calculations with experimental data. The important role of level-density parameters in accurately determining the strength of nuclear friction is revealed.It is further shown that high-energy conditions can enhance the sensitivity of ssion cross sections to nuclear dissipation.