核能级密度大集体增强的实验证据及其在辐射中子俘获中的意义
Experimental Evidence of Large Collective Enhancement of Nuclear Level Density and its Significance in Radiative Neutron Capture
AI总结：
本研究通过中子能谱测量发现形变$^{171}$Yb核存在40±3的大核能级密度集体增强因子，结合Oslo数据得到能量依赖的完整图像，对天体物理相关的辐射中子俘获研究有重要意义。
摘要：
通过对中子能谱的专属测量，推断出形变$^{171}$Yb核中核能级密度的集体增强及其随激发能量的衰减。中子能谱的统计模型分析首次证明了40$\pm$3的大集体增强因子，这与近期的微观模型预测相符，但与邻近形变核的测量结果相比是反常的。通过结合中子结合能以下的Oslo数据，获得了与能量相关的集体增强的完整图像。本文强调了大集体增强在天体物理关注的辐射中子俘获截面中的重要性。
英文摘要：
The collective enhancement of nuclear level density and its fade out with excitation energy in deformed $^{171}$Yb nucleus has been inferred through an exclusive measurement of neutron spectra.The statistical model analysis of neutron spectra demonstrated a large collective enhancement factor of 40$\pm$3 for the first time, which corroborates with the recent microscopic model predictions but is an anomalous result compared with the measurements in the nearby deformed nuclei. The complete picture of the energy dependent collective enhancement has been obtained by combining with Oslo data below neutron binding energy. The significance of large collective enhancement in radiative neutron capture cross section of astrophysical interest is highlighted.
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