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.
31.10.2017 — 10:30-12:30
01.11.2017 — 10:30-12:30
02.11.2017 — 10:30-12:30
07.11.2017 — 10:30-12:30
08.11.2017 — 10:30-12:30
09.11.2017 — 10:30-12:30
On 29 October at 17:00 the lecture “Memory and Learning: How It Works” will be given by Asya Kazantseva at the Blokhintsev Universal Library with support from DLNP.
A popular science journalist Asya Kazantseva will speak about the latest achievements in neurobiology and experimental psychology. What allows memorizing more information? Is it possible to get rid of fears? Why is the seashell an ideal object for studying memory mechanisms?
In the past decades, neurobiologists have seriously advanced in understanding processes that occur in the brain as one learns new information. They can already rewrite memories in the experiments on rats and dim emotions of the past in volunteers. At what moment can people recall everything and is it necessary? What techniques are even now able to improve preparation for seminars, lectures, and exams?
“Precision measurement of the mixing angle 𝜽13 and mass splitting ∆𝒎𝟑2𝟐 and the first investigation of neutrino coherence in the Daya Bay experiment”
Authors: M.O. Gonchar, Yu.A. Gornushkin, M.A. Dolgareva, D.V. Naumov, E.A. Naumova, D. Taichenachev, A.V. Chukanov, K.A. Treskov, A.G. Olshevsky, and I.B. Nemchenok.
“Search for new physics in the ATLAS experiment at the LHC”
Authors: V.A. Bednyakov, I.V. Eletskikh, M.V. Chizhov, and E.V. Khramov
“Preparation and performance of neutrino oscillation measurements in the NOvA experiment”
Authors: N.V. Anfimov, A.I. Antoshkin, N.A. Balashov, A.E. Bolshakova, I.D. Kakorin, L.D. Kolupaeva, C.T. Kullenberg, V.A. Naumov, A.G. Olshevsky, O.N. Petrova, O.B. Samoilov, A.S. Sheshukov, and A.P. Sotnikov
The first Micromegas readout panel for the ATLAS Muon Spectrometer upgrade has been successfuly assembled at the JINR production site. The production site has been set up specially for this work in the Laboratory of Nuclear Problems and comprises a clean room and assembly equipment. The Micromegas technology allows to construct the advanced micropattern gaseous particle detectors. This technology did not exist at JINR until now.
JINR takes part in the mass production of Micromegas chambers to construct New Small Wheels of the ATLAS detector in scope of the ATLAS upgrade for the High Luminosity LHC run. NSW will replace already existing forward muon-tracking detectors, which won't be able to cope with the high background rate during Run-3. The production site at the Laboratory of Nuclear Problems should produce and test 64 two-sided readout panels for the outer part of the NSW Large Sectors. The area of each panel is about 3 m2. Being assembled with the drift panels produced at the Aristotle University of Thessaloniki, these panels will be used to produce 32 Micromegas quadruplets, which should be tested and shipped to CERN. This work also will be done at JINR.
Mass production at the DLNP site should start in July 2017. The schedule is very tight: all Micromegas chambers should be produced during 22 months. The chambers are expected to be installed in the ATLAS cavern in 2019.
A message came from the Baikal ice that a new cluster was installed in the Baikal deep underwater neutrino detector. Photo: heroes of the year 2017, the Baikal neutrino telescope team.
Why is there more matter than antimatter in the universe? The reason might be hidden in the neutrino nature: one of the preferred theoretical models assumes that these elementary particles are identical with their own anti-particles. This in turn would lead to an extremely rare nuclear decay process, the neutrinoless double-beta decay (0nββ). The experiment GERDA now has reached a most important improvement in the search for 0nββ decay by reducing the disturbances (background) to an unprecedented low level making it the first “background-free” experiment in the field. This achievement is reported in the recent Nature article appearing April 6th, 2017 (doi:10.1038/nature21717).
Zinovi Vladimirovich KRUMSHTEIN
29.03.1942 – 23.02.2017
Zinovi Vladimirovich Krumshtein, head of the Methodological Research Sector, Division of Elementary Particle Physics, DLNP, died on 23 February 2017.