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Issue N° 5

The CMS Experiment at CERN

Théo Moret

This article will present the study and the reconstruction of particles thanks to the Compact Muon Solenoid detector. It is one of the four main detectors of the CERN's particle accelerator called 'Large Hadron Collider'. The LHC - which lies near Geneva - is a circular ring used to create high-energy collisions between various entities. Its global fonctioning will be examined first, followed by the study of the CMS detector in details. The different subdetectors of CMS will be presented to understand the concept of 'particle reconstruction'. However some particles are not stable enough to get across the detector. Therefore, their products of disintegration will be observed. By looking at the article 'A measurement of the Higgs boson mass in the diphoton decay channel' by CMS collaboration, the final part exemplifies the reconstruction of particles that are not directly observed such as the Higgs boson.

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Issue N° 5

Iodine: 210 years of research at the service of society

Antoine Brunel, Côme Cattin, Camille Chartier

Discovered by accident at the beginning of the 19th century, iodine quickly became the subject of numerous research projects and applications that have continued to grow over the years. Different from other halogens, it is distinguished by its redox properties, its low electronegativity, its great polarizability and its hypervalence. Iodine is present in everyday life in table salt, in food colouring and in halogen lamps. It plays a key role as a catalyst in the industrial production of acetic acid. It is also widely used in solution chemistry due to its redox properties which make it a redox species of choice. In organic synthesis, the iodation of organic compounds is of great interest and hypervalent iodine compounds are used for their oxidizing properties. In addition to its antiseptic properties and its use in radioprotection and medical imaging, iodine is a trace element that regulates hormonal systems. Iodine deficiency remains a major public health problem today.

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Issue N° 5

Phosphorescent windows - Synthesis of phosphorescent strontium aluminates

Lise Boutenègre, Simon Baillet

When one visits a church, one cannot but stare in awe at the vitrals - usually a centerpiece of the building. However, it is much more difficult to look at them properly at night. We dealt with that issue during the "Tournoi Français des Chimistes", and we will be presenting in this article our thoughts and experiments about creating vitrals that can be lit autonomously at night.

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