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arXiv 0912.3594nucl-th
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核巨共振中的时标

Time scales in nuclear giant resonances

WD Heiss, RG Nazmitdinov, FD Smit

摘要:

本文提出了一种测量核巨共振截面涨落的一般方法。模拟的截面是从一个特定的,但代表性的自能,其中包含所有有关碎裂的信息。使用小波分析,我们演示了提取的时间尺度的级联衰减到配置的不同复杂性的共振。我们认为,核中集体激发的扩展宽度由功率谱中的碎裂数决定。使用截面的傅立叶展开的小波分析的解析处理证实了该原理。一个简单的规则与层次结构的不同的复杂性相关联的状态的相对生命期。

英文摘要:

We propose a general approach to characterise fluctuations of measured cross sections of nuclear giant resonances. Simulated cross sections are obtained from a particular, yet representative self-energy which contains all information about fragmentations. Using a wavelet analysis, we demonstrate the extraction of time scales of cascading decays into configurations of different complexity of the resonance. We argue that the spreading widths of collective excitations in nuclei are determined by the number of fragmentations as seen in the power spectrum. An analytic treatment of the wavelet analysis using a Fourier expansion of the cross section confirms this principle. A simple rule for the relative life times of states associated with hierarchies of different complexity is given.

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。

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