用转移反应研究<sup>6</sup>He奇特核体系的光学势

杨磊; 林承键; 贾会明; 马南茹; 王东玺; 杨峰; 徐新星; 孙立杰; 温培威; 钟福鹏; 孙浩瀚; 张焕乔

doi:10.7538/yzk.2019.53.10.1762

用转移反应研究⁶He奇特核体系的光学势

中国原子能科学研究院核物理研究所,北京102413
国防科技工业抗辐照应用技术创新中心,北京102413
广西师范大学物理科学与技术学院,广西桂林541004

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- 刊出日期: 2019-10-19

Study of Optical Potential of ⁶He Halo Nuclear System by Transfer Reaction

Department of Nuclear Physics, China Institute of Atomic Energy, Beijing 102413, China
National Innovation Center of Radiation Application, Beijing 102413, China
College of Physics and Technology, Guangxi Normal University, Guilin 541004, China

摘要

摘要: 由于受到放射性束强度弱、品质差的限制，奇特核体系的光学势性质一直是亟待解决的国际难题。本工作利用稳定束的转移反应作为探针，深入研究了反应出射道奇特核体系的光学势性质。利用中国原子能科学研究院的HI-13串列加速器在近库仑位垒能区高精度测量了⁷Li+⁶³Cu、²⁰⁸Pb的弹性散射以及单质子转移反应角分布，并利用扭曲波玻恩近似（DWBA）和耦合反应道（CRC）方法对实验数据进行了拟合，抽取了出射道⁶He+⁶⁴Zn、²⁰⁹Bi晕核体系的光学势参数。所得参数可重现文献中已有的6He体系的弹性散射角分布，验证了这种方法的可靠性。对所得势参数的能量相依性的分析表明，在重体系⁶He+²⁰⁹Bi中，基于因果律的色散关系并不适用，其潜在的物理原因还需进一步深入研究。
- 奇特核体系 ,
- 光学势 ,
- 转移反应 ,
- 色散关系
Abstract: Due to the limits of the intensity and quality of the radioactive ion beams, it is difficult to extract the reliable optical potentials of halo nuclei directly from elastic scattering measurements. Therefore, it is still a challenging task to study the properties of the optical potentials of halo nuclear systems. The optical potentials of ⁶He halo nuclear systems were extracted by measuring the transfer reactions with stable beams. The angular distributions of elastic scattering and one-proton transfer reactions of ⁷Li+⁶³Cu and ²⁰⁸Pb were measured at energies around the Coulomb barrier. The optical potentials of ⁶He+⁶⁴Zn and ²⁰⁹Bi systems in the exit channel were extracted by fitting the transfer reaction data with the distorted-wave Born approximation (DWBA) and coupled reaction channels (CRC) methods, respectively. The derived potential parameters can reproduce the existing experimental elastic scattering data at the corresponding energies, which verifies the validity of the transfer reaction method. According to the energy dependence of the optical potentials, it’s found that the dispersion relation, which is based on the causality principle, is not applicable for the ⁶He+²⁰⁹Bi system. The possible explanations for such a peculiar behavior were discussed, but further study is still desired for the underlying physics.
- halo nuclear system ,
- optical potential ,
- transfer reaction ,
- dispersion relation

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参考文献(28)

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用转移反应研究6He奇特核体系的光学势

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Study of Optical Potential of 6He Halo Nuclear System by Transfer Reaction

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用转移反应研究⁶He奇特核体系的光学势

Study of Optical Potential of ⁶He Halo Nuclear System by Transfer Reaction