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arXiv 1302.3775nucl-th
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形变核有效理论中多声子带的转动常数

Rotational constants of multi-phonon bands in an effective theory for deformed nuclei

Jialin Zhang, T. Papenbrock

摘要:

我们认为变形核内的一个有效的理论,利用旋转和振动激发之间的小比例。对于偶-偶核,有效理论预测了在多声子激发上建立的带的转动常数的微小变化,所述多声子激发在激发声子的数目上是线性的。在166 Er和168 Er中,这解释了双声子伽马振动带的转动常数的主要变化。在232 Th中,有效理论正确地解释了转动常数随带头自旋增加而减小的趋势。我们还研究了形变奇核的有效理论。在这里,时间奇项进入拉格朗日并产生有效的磁力,产生在这样的原子核中观察到的高能级密度。

英文摘要:

We consider deformed nuclei within an effective theory that exploits the small ratio between rotational and vibrational excitations. For even-even nuclei, the effective theory predicts small changes in the rotational constants of bands built on multi-phonon excitations that are linear in the number of excited phonons. In 166Er and 168Er, this explains the main variations of the rotational constants of the two-phonon gamma vibrational bands. In 232Th, the effective theory correctly explains the trend that the rotational constants decrease with increasing spin of the band head. We also study the effective theory for deformed odd nuclei. Here, time-odd terms enter the Lagrangian and generate effective magnetic forces that yield the high level densities observed in such nuclei.

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