Script Darkside

	✓	Sigla + loghi CF INFN DS20K VIS ~ 10 s

	1.	There is a wide range of astronomical evidence that all galaxies are immersed in larger clouds of non-luminous matter - hence the term, Dark Matter - which is over 5 times more abundant than the ordinary matter we are familiar with. If we put together all of visible matter, galaxies, stars, gas, black holes, planets, humans, that amounts to just about 15% of the total, while 85% is believed to be made of misterious Dark Matter ~ 30s
	2.	The first indication for the existence of Dark Matter comes in 1933, astronomer Zwicky coins the term to describe an invisible matter, necessary to explain galaxy motions in a large galaxy cluster. In 1970 clearer proof comes from the analysis of spiral galaxy rotation curves: Rubin, Ford and Freeman find that to explain the way galaxies rotate it is necessary to assume the presence of about 6 times the visible matter, and this indirect evidence has been confirmed in the following decades by several other sets of observations ~ 20s
	3.	If a large spiral galaxy just like our own Milky Way would only be composed by the traditional visible matter we know of, the inner stars would rotate at a higher speed than the outer ones (such as our Sun). This would be seen clearly in rotational velocity plot. However, from rotation velocity astronomical measurements we see a different behavior: the outer stars rotate around the galactic center as fast if not faster than the inner ones. This can only be physically possible if the galaxy itself was immersed in a much bigger and massive “halo” of a matter we can’t see… Dark Matter seems to be absolutely necessary to explain the Universe as we see it ~ 40s
	4.	We believe Dark Matter to be made of some particle whose nature is still unknown: one leading theoretical explanation, motivated by the so-called supersymmetry theory, is that dark matter is comprised of yet undiscovered Weakly Interacting Massive Particles (WIMPs) that only interact with regular atoms through gravity or through extremely rare collisions that we could in principle detect. The predicted collision rates are extremely small and require detectors with very large target masses (1-100 ton), located in deep underground sites to eliminate background ~ 20s 
	5.	The Darkside collaboration is an international affiliation of 31 universities and research institutes from 14 countries that aims at the direct detection of WIMP DM at the at the Gran Sasso National Laboratory in Assergi, Italy ~ 20s
	6.	The target material in Darkside 20K is liquid Argon, a cryogenic material with optimal properties for a DM experiment. If WIMPs exist, they are expected to collide with atomic Argon nuclei, causing them to recoil and produce free electrons and photons that we can observe. Argon is a gas present in the atmosphere, however not all Argon is the same: while Argon 40 (meaning its nucleus has 40 between protons and neutrons) is stable, and therefore optimal for a DM experiment, the unstable Argon 39 is produced in small quantities in the atmosphere by interaction with Cosmic rays coming from space. This is why the Argon for Darkside is found underground: the stable Argon 40 is shielded from the cosmic rays, and the Argon 39 that got trapped has already decayed in thousands of years underground ~ 30s
	7.	The best quality Argon is extracted in a deep mine in Colorado, is then sent for further purification to a laboratory in Sardinia before its use in the experiment. The production of the extremely sophisticated instrumentation happens in several labs around the world, among which Napoli and CERN. All this work converges at the underground Gran Sasso Laboratory, where Darkside is located ~ 30s
	8.	(ESPERIMENTO ~ 1m e 30s) Modello 3D - Highlight components ~ 45s - Esperimento infografica 2D S1 S2 ~ 45s
	9.	WRAP UP. Thanks to Darkside 20K we will be able to either detect DM for the first time, or strongly constrain its nature and its properties: the quest on this misterious component of the Universe is on ~ 15s

	▪	TOTALE ~ 4m 45s