Multiscale fluctuations in nuclear response

Details Multiscale fluctuations in nuclear response Multiscale fluctuations in nuclear response

1999-09-07

arxiv.org/abs/nucl-th/9909008v1

Phys.Rev. C60 (1999) 064307; Erratum-ibid. C62 (2000) 029901

Physics

Nuclear Physics

Nuclear Theory

34 Latex pages including 6 figures (submitted to Phys. Rev. C)

Scientific paper

10.1103/PhysRevC.60.064307

The nuclear collective response is investigated in the framework of a doorway picture in which the spreading width of the collective motion is described as a coupling to more and more complex configurations. It is shown that this coupling induces fluctuations of the observed strength. In the case of a hierarchy of overlapping decay channels, we observe Ericson fluctuations at different scales. Methods for extracting these scales and the related lifetimes are discussed. Finally, we show that the coupling of different states at one level of complexity to some common decay channels at the next level, may produce interference-like patterns in the nuclear response. This quantum effect leads to a new type of fluctuations with a typical width related to the level spacing.

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