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arXiv 0811.4741nucl-th
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92- 100 Mo中E1强度的Skyrme随机相位近似描述

Skyrme-Random-Phase-Approximation description of E1 strength in 92-100Mo

J. Kvasil, P. Vesely, V. O. Nesterenko, W. Kleinig, P. -G. Reinhard, S. Frauendorf

摘要:

在Skyrme力SkT 6、SkM*、SLy 6和SkI 3的自洽可分随机相位近似(SRPA)模型下,分析了Mo同位素(A= 92,94,96,98,100)的等矢量偶极E1强度.特别注意的是低能量区域附近的粒子阈值(4-12兆电子伏),这是重要的天体物理过程的理解。我们表明,由于补偿效应,核变形对E1强度低于10-12 MeV的影响是相当温和的。与此同时,与先前的预测一致,变形增加了更高能量下的强度。在4-8 MeV能量范围内,强度主要由E1巨共振的尾部决定。四种Skyrme力对整个巨共振的描述不同,但在12 MeV以下给出了相当相似的结果。

英文摘要:

The isovector dipole E1 strength in Mo isotopes with A=92,94,96,98,100 is analyzed within the self-consistent separable random-phase approximation (SRPA) model with Skyrme forces SkT6, SkM*, SLy6, and SkI3. The special attention is paid to the low-energy region near the particle thresholds (4-12 MeV), which is important for understanding of astrophysical processes. We show that, due to a compensation effect, the influence of nuclear deformation on E1 strength below 10-12 MeV is quite modest. At the same time, in agreement with previous predictions, the deformation increases the strength at higher energy. At 4-8 MeV the strength is mainly determined by the tail of E1 giant resonance. The four Skyrme forces differ in description of the whole giant resonance but give rather similar results below 12 MeV.

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