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arXiv 1208.0149nucl-thnucl-ex
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Gogny力的第二随机相位近似。第一应用

Second random-phase approximation with the Gogny force. First applications

D. Gambacurta, M. Grasso, V. De Donno, G. Co', F. Catara

摘要:

本文介绍了有限程Gogny相互作用下第二类随机相位近似模型的首次应用。我们讨论了在这种类型的计算中使用这样的相互作用的优点,其中包括2粒子2孔配置。在目前的工作中发现的结果证实了众所周知的第二随机相位近似谱的一般特征:我们发现一个大的位移,几个兆电子伏,响应质心相对于相应的随机相位近似值较低的能量。如已知的,这些结果表明,1粒子-1孔/2粒子-2孔和2粒子-2孔/2粒子-2孔耦合的影响是重要的。已经发现,相对于标准的随机相位近似结果的强度分布的变化是特别大的,在这种情况下。这种重要的影响是由于一些大的中子-质子相互作用的矩阵元,并表明这些矩阵元(在力参数的常规拟合过程中使用的平均场计算中没有贡献)应该被仔细约束以执行计算

英文摘要:

We present the first applications of the second random-phase-approximation model with the finite-range Gogny interaction. We discuss the advantages of using such an interaction in this type of calculations where 2 particle-2 hole configurations are included. The results found in the present work confirm the well known general features of the second random-phase approximation spectra: we find a large shift, several MeV, of the response centroids to lower energies with respect to the corresponding random-phase-approximation values. As known, these results indicate that the effects of the 1 particle-1 hole/2 particle-2 hole and 2 particle-2 hole/2 particle-2 hole couplings are important. It has been found that the changes of the strength distributions with respect to the standard random-phase-approximation results are particularly large in the present case. This important effect is due to some large neutron-proton matrix elements of the interaction and indicates that these matrix elements (which do not contribute in the mean-field calculations employed in the conventional fit procedures of the force parameters) should be carefully constrained to perform calculations

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