用么正变换算符研究短程关联和动量分布
Studying short-range correlations and momentum distributions with unitarily transformed operators
摘要：
用无核壳模型中的多体波函数研究了~ 4 He的短程关联。用相似重整化群（SRG）方法研究了Argonne V8相互作用和密度算符。短程关联的影响反映在坐标空间中作为两个核子之间的距离的函数的两体密度中，或者反映在动量空间中作为两个核子之间的相对动量的函数。SRG变换是在两体近似下进行的。通过比较不同流动参数下的计算结果和用关联高斯方法得到的带有裸Argonne V8'相互作用的精确计算结果，研究了三体和三体以上贡献的重要性。
英文摘要：
Short-range correlations in 4He are investigated using many-body wave functions obtained in the no-core shell model. The similarity renormalization group (SRG) is used to evolve the Argonne V8' interaction and the density operators. The effects of short-range correlations are reflected in the two-body densities in coordinate space as a function of the distance between two nucleons, or alternatively in in momentum space as function of the relative momentum between two nucleons. The SRG transformation is performed in two-body approximation. The importance of missing three-body and higher-body contributions is investigated by comparing results obtained for different flow parameters and by comparing to exact results with the bare Argonne V8' interaction obtained in the correlated Gaussian approach.
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