深亚垒能区非对称系统熔合位阻的演化
Evolution of fusion hindrance for asymmetric systems at deep sub barrier energies
摘要：
测量了7Li和12C与198Pt在深亚势垒能量下的熔合截面，揭示了入口通道在熔合阻碍发生中的作用。在12C + 198Pt系统中观察到明显的熔合阻碍，而在7Li + 198Pt系统中没有观察到熔合阻碍。出现的障碍，从较轻的（6，7Li）移动到较重的（12C，16O）射弹解释采用一个模型，该模型认为在低能量下从突然到绝热制度的逐渐过渡。模型计算揭示了本系统的耦合集体运动的阻尼效果较弱相比，获得较重的弹丸系统。
英文摘要：
Measurements of fusion cross-sections of 7Li and 12C with 198Pt at deep sub-barrier energies are reported to unravel the role of the entrance channel in the occurrence of fusion hindrance. The onset of fusion hindrance has been clearly observed in 12C + 198Pt system but not in 7Li + 198Pt system, within the measured energy range. Emergence of the hindrance, moving from lighter (6,7Li) to heavier (12C,16O) projectiles is explained employing a model that considers a gradual transition from a sudden to adiabatic regime at low energies. The model calculation reveals a weak effect of the damping of coupling to collective motion for the present systems as compared to that obtained for systems with heavier projectiles.
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