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!
31 октября 2017 года мировое астрофизическое сообщество впервые отмечает День темной материи. В этот день на многих площадках по всему миру пройдут научно-популярные мероприятия о темной материи для широкой публики. Международная коллаборация по физике частиц инициировала День темной материи, чтобы донести до широкой общественности свои поиски и стремления разгадать одну из самых интригующих тайн Вселенной.
День темной материи пройдет в Дубне в Универсальной библиотеке им. Д.И. Блохинцева 31.10. 2017 г. в 18.30 и откроется лекцией заместителя директора Лаборатории ядерных проблем ОИЯИ Д.В.Наумова "Не бойся неизвестного. Что мы знаем о темной материи во Вселенной?"
Проводимые ЛЯП ОИЯИ эксперименты позволяют ответить на ряд фундаментальных вопросов физики, в том числе и о природе галактической темной материи.
Понимание сущности темной материи может объяснить происхождение, эволюцию и структуру Вселенной. Её поиск в самых дальних уголках Вселенной, а также в масштабах меньших, чем атомы, - одна из самых горячих тем сегодняшней физики, и все, что мы узнаем о темной материи, будет открытием века.