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DAFNE
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DAFNE or DAΦNE (Double Annular Φ Factory for Nice Experiments), is an electron-positron collider at the INFN Frascati National Laboratory in Frascati, Italy.[1][2] It consists of 2 accelerator rings, both approximately 100 meters in length. Since 1999 it has been colliding electrons and positrons at a center of mass energy of 1.02 GeV to create phi mesons (φ). 85% of these decay into kaons (K), whose physics is the subject of most of the experiments at DAFNE.
There have been five experiments at DAFNE:
- KLOE (K LOng Experiment), 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 (FIsica NUcleare a DAFNE), studies the spectra and nonmesonic decays of hypernuclei containing lambda baryons (Λ). The hypernuclei are produced by negatively charged kaons (K−
) striking a thin target. - DEAR (DAFNE Exotic Atoms Research 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 (SIlicon Drift Detectors for Hadronic Atom Research by Timing Application), aims to improve the precision measurements of X-ray transitions in kaon atoms studied at DEAR.
External links
[edit]- Homepage of the accelerator division of Frascati National Laboratory: public (Italian), technical
References
[edit]- ^ "INSPIRE". inspirehep.net. Retrieved 2024-11-29.
- ^ "DAΦNE, THE ELECTRON POSITRON Φ-FACTORY AT INFN-FRASCATI" (PDF). 1995.
DAFNE
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Dafne is an early opera composed by Jacopo Peri with a libretto by Ottavio Rinuccini, premiered privately in Florence in late 1597 or early 1598, and widely regarded as the first work to embody the genre of opera as understood in modern terms.[1][2][3]
The opera emerged from the intellectual circle known as the Florentine Camerata, a group of musicians, poets, and scholars in late 16th-century Florence who sought to revive the dramatic style of ancient Greek tragedy through a fusion of spoken word, music, and theater, emphasizing monody—a solo vocal line accompanied by simple instrumentation—to mimic natural speech rhythms.[1][3] Rinuccini's libretto, drawn from Ovid's Metamorphoses, recounts the mythological tale of the nymph Dafne, who flees the advances of the god Apollo and is transformed into a laurel tree to escape him, featuring characters such as Apollo, Dafne, Venus, Cupid, and a messenger, structured in six scenes with choruses and recitatives.[2][4]
Peri's score, performed by a small ensemble including harpsichord, chitarrone (a large lute), and possibly other strings, pioneered the use of stile recitativo (recitative style) to advance the narrative without the rigid structures of earlier madrigals or interludes, though only fragments of the music survive today, with the full libretto of 455 verses preserved.[2] The work was initially staged at the Palazzo Corsi during Carnival season for a private audience of nobility and intellectuals, with soprano Vittoria Archilei likely portraying Dafne in a later public performance at Palazzo Pitti in 1599, reflecting the experimental and elite context of its creation.[2][4]
Dafne's legacy lies in establishing opera as a viable art form, influencing Peri's subsequent Euridice (1600)—the earliest surviving complete opera—and paving the way for composers like Claudio Monteverdi, while its loss of most musical material has led to modern reconstructions based on the libretto and stylistic analyses to perform and study it.[1][4]
