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Ericson fluctuations — Wikipedia (en)

Source: Wikipedia (en)
Original: https://en.wikipedia.org/wiki/Ericson_fluctuations
License (as archived): CC-BY-SA-4.0
Archived: 2026-10-31T09:58:05.097Z
SHA-256 of the archived text: 51c5ef76a84bdba6802143895aa2d83751f0ac429ac029b4f559722c75aa31fb
Stable URL of this page: https://metraipolis.com/documento/dc_ec201eee4634

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Ericson fluctuations — Wikipedia (en) — Wikipedia (en), https://en.wikipedia.org/wiki/Ericson_fluctuations (CC-BY-SA-4.0); archived copy: https://metraipolis.com/documento/dc_ec201eee4634 (Metraipolis archive dc_ec201eee4634, sha256 51c5ef76a84bdba6802143895aa2d83751f0ac429ac029b4f559722c75aa31fb)

BibTeX

@misc{dcec201eee4634,
  title = {Ericson fluctuations — Wikipedia (en)},
  howpublished = {Wikipedia (en)},
  url = {https://en.wikipedia.org/wiki/Ericson_fluctuations},
  note = {License CC-BY-SA-4.0; archived copy https://metraipolis.com/documento/dc_ec201eee4634; sha256 51c5ef76a84bdba6802143895aa2d83751f0ac429ac029b4f559722c75aa31fb},
  year = {2026}
}

Archived text

Reproduced under CC-BY-SA-4.0. Attribution: Wikipedia (en), https://en.wikipedia.org/wiki/Ericson_fluctuations. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Ericson fluctuations constitute one of the most characteristic features of quantum chaotic scattering in the regime of strongly overlapping resonances such as a compound nucleus. These fluctuations were predicted in 1960 by Torleif Ericson in two seminal articles, further developed in 1963, based on the same statistical assumptions as those used by E. Wigner, C. E. Porter and R. G. Thomas to describe generic properties of resonances in long-lived compound nuclear systems. In the present case the fluctuations occur in the "continuum" regime for which a large number of such resonances overlap coherently, owing to the short lifetime of the compound nucleus. At the time it was believed that this would lead to a structure-less behavior. Ericson realized that the opposite was the case with strong, random fluctuations. The Ericson fluctuations were first observed in 1964 by P. Von Brentano et al. in nuclear physics giving rise to a vigorous theoretical and experimental programme. They have the curious feature of being both reproducible and random at the same time. The fluctuations are universal and have later been observed in many other areas such as photoionization of hydrogen, uni-molecular dissociation (physical chemistry), perturbed atomic and molecular systems and micro wave billiards. Present theoretical descriptions of chaotic quantum scattering confirm the predicted properties of the Ericson fluctuations. The universality of the Ericson fluctuations are thus very well established.

Tema degli esploratori: fisica e astronomia (deposito sistematico; ricerca «nuclear physics»).
Fonte: Wikipedia in inglese, voce «Ericson fluctuations» — https://en.wikipedia.org/wiki/Ericson_fluctuations
Wikidata Q109561711 (dati Wikidata in CC0 1.0) — https://www.wikidata.org/wiki/Q109561711
Autori: i contributori di Wikipedia (cronologia: https://en.wikipedia.org/wiki/Ericson_fluctuations?action=history).
Licenza: Creative Commons Attribuzione-Condividi allo stesso modo 4.0 (CC BY-SA 4.0) — https://creativecommons.org/licenses/by-sa/4.0/. Il riuso richiede attribuzione e stessa licenza.
Estratto dell'introduzione non modificato nel contenuto; revisione 1371057909, consultata il 2026-10-31T09:42:41.017Z tramite l'API ufficiale di Wikipedia. Impronta SHA-256 dell'estratto: 60134dfe1dd07dbb276bd825ddada95dce0f9f5314f837c8549a9a1eadd61190