A First Look at How the Earth Stops High-Energy Neutrinos in Their Tracks
Neutrinos are abundant subatomic particles that are famous for passing through anything and everything, only very rarely interacting with matter. About 100 trillion neutrinos pass through your body every second. Now, scientists have demonstrated that the Earth stops very energetic neutrinos—they do not go through everything. These high-energy neutrino interactions were seen by the IceCube detector, an array of 5,160 basketball-sized optical sensors deeply encased within a cubic kilometer of very clear Antarctic ice near the South Pole.
IceCube’s sensors do not directly observe neutrinos, but instead measure flashes of blue light, known as Cherenkov radiation, emitted by muons and other fast-moving charged particles, which are created when neutrinos interact with the ice, and by the charged particles produced when the muons interact as they move through the ice. By measuring the light patterns from these interactions in or near the detector array, IceCube can estimate the neutrinos’ directions and energies.
On 11 November 2017, a joint workshop of the DLNP experimenters and LIT specialists was held to discuss the use of JINR computer resources in neutrino experiments conducted by our laboratory.
Oleg Samoilov (DLNP) shared his experience of using LIT clouds in this work. Nilolai Kutovsky (LIT) and Nikita Balashov (LIT) talked about the development of the cloud technologies and their use in the DLNP neutrino programme. The status of the CSNP (Computing Support of Neutrino Programme) initiative group after the year of work was discussed.
A new liquid-cooled server prototype proposed by the IMMERS Company aroused great interest.
By the Decree of the President of the Russian Federation of 2 November 2017 No. 531, Academician V.A. Matveev, Director of the Joint Institute for Nuclear Research, is awarded the Order “For Services to the Fatherland” III degree for the great contribution to the development of science, education, and training of skilled specialists and many-year dedicated work.
The Dzhelepov Laboratory of Nuclear Problems congratulates Viktor Anantolyevich on being awarded this high state order and the rank of Officer of the French National Order of Merit!
The Order “For Services to the Fatherland” is a state decoration of the Russian Federation awarded for outstanding contributions to the state associated with the strengthening of Russian statehood, social and economic development of the state, advances in culture and arts, sports, peace, friendship and cooperation between nations, and for contributions to the defence of the state. Itsmottois “Benefit, Honour, Glory”.
The insignia of the Officer of the National Order of Merit was conferred on V.A. Matveev in the French Embassy of France in Moscow on 31 October 2017. The National Order of Merit was established by the Decree of the President of France General Ch. de Gaulle of 3 December 1963 and replaced numerous ministerial orders of merit. It can be awarded to French citizens as well as foreign nationals for distinguished civilian and military merits. The order has five classes: Grand Cross, Grand Officer, Commander, Officer, and Knight.
October 31, 2017 marks the 60th birthday of Prof. V.A. Bednyakov, Director of the Dzhelepov Laboratory of Nuclear Problems, Doctor of Sciences (Physics and Mathematics), coordinator of JINR participation in the physics programme at ATLAS, and author of a number of popular-science articles.
Scientific interests of V.A. Bednyakov are quite wide, embracing elementary particle physics and physics of neutrinos and rare processes, where he carries out successful studies. One of his main research topics is detection of dark mater particles in laboratory experiments. Together with S.G. Kovalenko, he actually laid down a theoretical basis for these researches at JINR. Now he is a leading expert in this field in Russia. Another important line of his research is the search for manifestations of physical phenomena beyond the Standard Model that may allow observing supersymmetry both at extremely high collider energies and in low-energy processes and astrophysics. In 1999, on the basis of the works in those two fields, V.A. Bednyakov defended his doctoral dissertation “Investigation of a possibility of observing supersymmetry in rare processes in cosmology”. His works on detection of galactic dark matter particles on the Earth and in space are widely known not only in Russia but also in the world.
On 19 October 2017, at the session of the Dissertation Council of the Institute for Nuclear Research, Russian Academy of Sciences (Moscow) D.V. Naumov, DLNP Deputy Director, defended the dissertation “Measurement of θ₁₃, Δm²₃₂ and covariant quantum-field theory of neutrino oscillations” for getting the degree of the Doctor of Sciences in Physics and Mathematics.
We congratulate Dmitry Vadimovich on the successful defence of the dissertation and wish him further success and creative achievements in his scientific and educational activity!
On 31 October 2017 the international astrophysical community celebrates the first-ever Dark Matter Day. On this day popular-science events devoted to dark matter will be held for the public all over the world. The international particle physics collaboration launched Dark Matter Day to raise awareness about attempts being made to solve one of the most intriguing mysteries of the Universe.
In Dubna, the Dark Matter Day event will be held at the Blokhnitsev Universal Library on 31 October 2017 at 18:30, beginning with a lecture “Don’t fear the unknown. What do we know about dark matter in the Universe?” to be delivered by the DLNP Deputy Director D.V. Naumov.
Experiments carried out by DLNP allow answers to be given to a number of fundamental questions in physics, including the nature of galactic dark matter. Understanding the nature of dark matter would help explain the origin, evolution, and structure of the Universe. Search for dark matter in the farthest reaches of the Universe and on scales smaller than atoms is one of the burning topics in today’s physics, and everything that we will learn about dark matter will be the discovery of the century.
Igor Ivanov (CFTP, Instituto Superior Tecnico, Lisbon) will give at DLNP a lecture course on neutrino mass models. The lectures will start with basics on Dirac and Majorana neutrinos and their mass terms and will proceed with various tree-level and radiative examples of the seesaw mechanism. Then, after a gentle introduction to the theory of finite groups, an example will be shown of how symmetry-based lepton sectors shape the PMNS mixing matrix.
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