EMC效应与有效口袋半径

在本文中,我们提出了束缚核子半径的减小可以产生EMC效应的论点,并对目前解释EMC效应的流行观点进行了一些讨论.     

Measurement of Carrier-Envelope Phase and Field Strength of a Few-Cycle Pulse by Non-sequential Double Ionization

We propose a method to measure the carrier-envelop phase （CEP） and the intensity of a few-cycle pulse by controlling the non-sequentiai double ionization （NSDI） process. By using an additional static electric field, we can change the momentum distribution of the double-charged ions parallel to the laser polarization from an asymmetrical double-hump structure to a nearly symmetrical one. It is found that the ratio between the strength of the static electric field and that of the laser field is sensitive to the CEP but robust against the intensity fluctuation. Therefore we can determine the OEP of a few-cycle pulse precisely by measuring the static electric field. Fhrthermore, if the CEP of the few-cycle pulse is fixed at a certain value, we can also calibrate the intensity of the laser pulse by the static electric field.     

Rotational invariants constructed by the products of three spherical harmonic polynomials

The rotational invariants constructed by the products of three spherical harmonic polynomials are expressed generally as homogeneous polynomials with respect to the three coordinate vectors in the compact form, where the coefficients are calculated explicitly in this paper.     

Complex coordinate rotation method based on gradient optimization

In atomic,molecular,and nuclear physics,the method of complex coordinate rotation is a widely used theoretical tool for studying resonant states.Here,we propose a novel implementation of this method based on the gradient optimization(CCR-GO).The main strength of the CCR-GO method is that it does not require manual adjustment of optimization parameters in the wave function;instead,a mathematically well-defined optimization path can be followed.Our method is proven to be very efficient in searching resonant positions and widths over a variety of few-body atomic systems,and can significantly improve the accuracy of the results.As a special case,the CCR-GO method is equally capable of dealing with bound-state problems with high accuracy,which is traditionally achieved through the usual extreme conditions of energy itself.     

类锂离子体系自旋四重态费米接触项的精密计算

费米接触项与原子超精细结构常数有密切关系,往往对原子能级的超精细劈裂起主要贡献.波函数在原点处的行为以及电子之间的关联效应是影响费米接触项计算精度的两个主要因素.对于一般的原子体系来说,费米接触项的高精度计算不是一件容易的工作.本文利用Hylleraas坐标下的Rayleigh-Ritz变分法求解了锂原子和类锂离子体系(Z=4—10)自旋四重态1s2s3s⁴S,1s2s4s⁴S和1s2s2p⁴P的薛定谔方程,得到的非相对论变分能量收敛精度达到10–13.根据所得到的高精度变分波函数,计算了这些体系的费米接触项,并研究了原子核的有限质量对结果的影响.费米接触项的精度达到了10–10.本文结果可以作为其他理论方法的参考基准,同时也为相关的实验研究提供了参考数据.