arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1302.0202nucl-thnucl-ex
收藏

三体力对核物质离壳质量算符和谱函数的影响

Three-body force effect on off-shell mass operator and spectral functions in nuclear matter

Pei Wang, Sheng-Xin Gan, Peng Yin, Wei Zuo

摘要:

在Brueckner理论的框架内,质量算符$M(k,ω)=V(k,ω)+iW(k,ω)$的离壳行为,即,通过引入核三体力(TBF),研究了它对动量$k$和核子频率$ω$的依赖性.考虑了质量算符的孔线展开的前两项。讨论了TBF对它们离壳性能的影响。比较了$M_{1}$的壳上值和壳外值。计算表明,在饱和密度下,TBF效应对核子谱函数和核子动量分布几乎没有影响。在比饱和密度大两倍的高密度下,包含TBF可以导致对光谱函数的可见影响,并且可以增强空穴态的耗尽。

英文摘要:

Within the framework of the Brueckner theory, the off-shell behaviors of the mass operator $M(k,ω)=V(k,ω)+iW(k,ω)$, i.e., its dependence upon the momentum $k$ and upon the nucleon frequency $ω$, are investigated by including nuclear three-body force (TBF). The first two terms of the hole-line expansion of the mass operator are taken into account. The TBF effects on their off-shell properties are discussed. A comparison is made between the on-shell and off-shell values of $M_{1}$. The nucleon spectral function and nucleon momentum distribution are also calculated, and the calculation shows that they are hardly affected by the TBF effect at the saturation density. At a high density two times greater than the saturation density, inclusion of the TBF may lead to a visible effect on the spectral function and may enhance the depletion of the hole states.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑