论文部分内容阅读
使用离线γ测量技术在实验室系２８．３ＭｅＶ至４５．７ＭｅＶ的能区首次测量了１２Ｃ＋９３Ｎｂ反应产生的８个核素及同质异能态的激发函数．使用包括非弹性激发和α转移道的简单耦合道模型，结合统计蒸发程序对实验结果进行拟合．计算结果能较好地重现强截面的中子蒸发道（ｘｎ）的激发函数．而对于弱的质子（ｘＰｙｎ）特别是α粒子（ｘαｙｎ）蒸发道的截面，实验测量明显高于模型计算结果．α转移道与入射道耦合作为熔合反应的门庭态使垒下能区重离子熔合截面有很大的加强，实验测量与理论计算的比较表明对于１２Ｃ＋９３Ｎｂ反应系统在垒下能区可能存在着很强的α转移截面．
The off-line gamma measurements were used to measure the energies of 8 nuclides and isoforms of the 12C + 93Nb reaction for the first time in the energy range of 28.3MeV to 45.7MeV in the laboratory. The experimental results were fitted using a simple coupled-channel model with inelastic excitation and α-transfer tract, combined with a statistical evaporation program. The calculated results can well reproduce the excitation function of strong cross-section neutron evaporation channel (xn). For the weak proton (xPyn), especially the αα (xαyn) evaporation tunnel cross section, the experimental measurement is obviously higher than the model calculation. The coupling between the α-transfer path and the incident path as the gating mode of the fusion reaction greatly strengthens the heavy ion fusion cross-section in the barrier energy region. The comparison of experimental measurements and theoretical calculations shows that there may exist a strong potential barrier in the 12C + 93Nb reaction system Α transfer cross section.