94Zr的中子谱因子可用于研究93Zr(n,γ)94Zr直接辐射俘获反应的激发函数和天体物理反应率,对研究s-过程的核合成有重要意义。现有的94Zr中子谱因子实验结果仍存在较大的差异。本工作在北京HI-13串列加速器Q3D磁谱仪上测量了12C+94Zr、13...94Zr的中子谱因子可用于研究93Zr(n,γ)94Zr直接辐射俘获反应的激发函数和天体物理反应率,对研究s-过程的核合成有重要意义。现有的94Zr中子谱因子实验结果仍存在较大的差异。本工作在北京HI-13串列加速器Q3D磁谱仪上测量了12C+94Zr、13C+94Zr弹性散射反应及94Zr(12C,13C)93Zr单中子转移反应的角分布。通过对弹性散射角分布的仔细分析,拟合出了入射道和出射道的光学势参数,并结合扭曲波玻恩近似(Distorted wave Born approximation,DWBA)理论对转移反应的微分截面进行了理论分析,提取出94Zr的中子谱因子为2.60±0.20。展开更多
The asymptotic normalization coefficients （ANCs） of the virtual decay 16N -- 15N ＋ n are extracted from the 15N（7Li, 6Li）16N reaction populating the ground and first three excited states in 16N. The root-mean-squ...The asymptotic normalization coefficients （ANCs） of the virtual decay 16N -- 15N ＋ n are extracted from the 15N（7Li, 6Li）16N reaction populating the ground and first three excited states in 16N. The root-mean-square （rms） radii of the valence neutron in these four low-lying 16N states are then derived by using the ANCs. The probabilities of the valence neutron staying out of the core potentials are found to be 31%± 8%, 58%± 12%, 3270 ± 8%, and 60% ± 12%. The present results support the conclusion that a one-neutron halo may be formed in the 16N first and third excited states, while the ground and second excited states do not have a one-neutron halo structure. However, the core excitation effect has a strong influence on the one-neutron halo structure of the ground and first excited states in 16N.展开更多
文摘94Zr的中子谱因子可用于研究93Zr(n,γ)94Zr直接辐射俘获反应的激发函数和天体物理反应率,对研究s-过程的核合成有重要意义。现有的94Zr中子谱因子实验结果仍存在较大的差异。本工作在北京HI-13串列加速器Q3D磁谱仪上测量了12C+94Zr、13C+94Zr弹性散射反应及94Zr(12C,13C)93Zr单中子转移反应的角分布。通过对弹性散射角分布的仔细分析,拟合出了入射道和出射道的光学势参数,并结合扭曲波玻恩近似(Distorted wave Born approximation,DWBA)理论对转移反应的微分截面进行了理论分析,提取出94Zr的中子谱因子为2.60±0.20。
基金Supported by National Natural Science Foundation of China(11505117,11490560,11475264,11321064,11375269)Natural Science Foundation of Guangdong Province(2015A030310012)+1 种基金973 program of China(2013CB834406)National key Research and Development Province(2016YFA0400502)
文摘The asymptotic normalization coefficients （ANCs） of the virtual decay 16N -- 15N ＋ n are extracted from the 15N（7Li, 6Li）16N reaction populating the ground and first three excited states in 16N. The root-mean-square （rms） radii of the valence neutron in these four low-lying 16N states are then derived by using the ANCs. The probabilities of the valence neutron staying out of the core potentials are found to be 31%± 8%, 58%± 12%, 3270 ± 8%, and 60% ± 12%. The present results support the conclusion that a one-neutron halo may be formed in the 16N first and third excited states, while the ground and second excited states do not have a one-neutron halo structure. However, the core excitation effect has a strong influence on the one-neutron halo structure of the ground and first excited states in 16N.
