On the mechanisms of superfluidity in atomic nuclei

On the mechanisms of superfluidity in atomic nuclei
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原子核超流性机制研究

DOI：
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发表时间：
2000
期刊：
影响因子：
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通讯作者：
S. Kamerdzhiev
S. Kamerdzhiev
中科院分区：
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文献类型：
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作者：
A. Avdeenkov;S. Kamerdzhiev

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得到了原子核中库珀能隙的方程组。该系统考虑到两种机制的超流性在一个近似二次的声子产生振幅：巴丁库珀施里弗（BCS）型机制和准粒子声子机制。这些方程在现实的近似中求解120 Sn。如果提出的简单程序被用来确定新的粒子-粒子相互作用和估计的平均效果，那么准粒子-声子机制的贡献所观察到的配对间隙的宽度是26%和BCS型的贡献是74%。这意味着至少在半成核中，配对是混合性质的-这是由于两种所示的机制，第一种主要是表面机制，第二种主要是体积机制。
A system of equations is obtained for the Cooper gap in nuclei. The system takes two mechanisms of superfluidity into account in an approximation quadratic in the phonon-production amplitude: a Bardeen-Cooper-Schrieffer (BCS)-type mechanism and a quasiparticle-phonon mechanism. These equations are solved for 120Sn in a realistic approximation. If the simple procedures proposed are used to determine the new particle-particle interaction and to estimate the average effect, then the contribution of the quasiparticle-phonon mechanism to the observed width of the pairing gap is 26% and the BCS-type contribution is 74%. This means that at least in semimagic nuclei pairing is of a mixed nature — it is due to the two indicated mechanisms, the first being mainly a surface mechanism and the second mainly a volume mechanism.