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{{short description|Italian electron-positron collider}}
{{Unreliable sources|date=November 2024}}
{{About|the Italian electron–positron collider|the French collider DAPHNE|Détecteur à Grande Acceptance pour la Physique Photonucléaire Expérimentale|other uses|Dafne (disambiguation)}}

[[File:DAFNE.jpg|thumb|right|Overview of the hall of the e + e- collider DAFNE at the Frascati National Laboratory of INFN]]
'''DAFNE''' or '''DAΦNE''' ('''D'''ouble '''A'''nnular '''Φ F'''actory for '''N'''ice '''E'''xperiments), is an [[electron-positron collider]] at the [[Istituto Nazionale di Fisica Nucleare|INFN]] [[Laboratori Nazionali di Frascati|Frascati National Laboratory]] in [[Frascati]], [[Italy]].<ref>{{Cite web |title=INSPIRE |url=https://inspirehep.net/experiments/1609165 |access-date=2024-11-29 |website=inspirehep.net}}</ref><ref>{{Cite web |date=1995 |title=DAΦNE, THE ELECTRON POSITRON Φ-FACTORY AT INFN-FRASCATI |url=https://www.lnf.infn.it/acceleratori/dafne/PUBLICATIONS/EPS95.pdf}}</ref> It consists of 2 accelerator rings, both approximately 100 meters in length. Since 1999 it has been colliding [[electron]]s and [[positron]]s at a [[center of mass]] energy of 1.02&nbsp;GeV to create [[phi meson]]s (φ). 85% of these decay into [[kaon]]s (K), whose physics is the subject of most of the experiments at DAFNE.

There have been five experiments at DAFNE:
* [[KLOE (experiment)|KLOE]] ([[Kaon#CP violation|'''K''' '''LO'''ng]] '''E'''xperiment), which has been studying [[CP violation]] in kaon decays and rare kaon decays since 2000. This is the largest of  DAFNE experiments. It has been continued by the KLOE-2 experiment.
* [[FINUDA]] ('''FI'''sica '''NU'''cleare a '''DA'''FNE), studies the [[emission spectrum|spectra]] and nonmesonic decays of [[hypernuclei]] containing [[lambda baryon]]s (Λ). The hypernuclei are produced by negatively charged kaons ({{Subatomic particle|Kaon-}}) striking a thin target.
* DEAR ('''D'''AFNE '''E'''xotic '''A'''toms '''R'''esearch experiment), determines scattering lengths in atoms made from a kaon and a [[proton]] or [[deuteron]].
* [[DAFNE Light Laboratory]] ('''DAΦNE-L''') consists of 3 lines of [[synchrotron radiation]] emitted by DAFNE, a fourth is under construction.
*  [[SIDDHARTA]] ('''SI'''licon '''D'''rift '''D'''etectors for '''H'''adronic '''A'''tom '''R'''esearch by '''T'''iming '''A'''pplication), aims to improve the precision measurements of [[X-ray]] transitions in kaon atoms studied at DEAR.

==External links==
* Homepage of the accelerator division of Frascati National Laboratory: [http://www.lnf.infn.it/public/index.php?option=com_content&view=category&layout=blog&id=41&Itemid=75 public (Italian)], [http://www.lnf.infn.it/acceleratori/ technical]

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== References ==
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[[Category:Particle physics facilities]]
[[Category:Particle experiments]]
[[Category:Research institutes in Italy]]
[[Category:Particle accelerators]]


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