The DarkSide-50 experiment is aimed at searching for dark-matter weakly interacting particles (WIMPs) with a large mass (>50 GeV), where a critical fact is the possibility of separating the signal from the possible background. The recently accomplished analysis of the data collected for 532 operation days of the facility days demonstrated unique capabilities of suppressing the background in the detector. An additional analysis of the low-energy region of the spectrum of the ionization events demonstrated that the DarkSide-50 detector was sensitive to low masses (<10 GeV) of dark-matter particles. These results add more confidence in that the observation of a positive signal in the second-generation facility, such as the projected DarkSide-20k experiment, will really mean observation of particles of a new nature.
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On 27 April 2018, a regular ATLAS weekly working meeting was held at DLNP. O.A. Koval’ (group headed by I.R. Boiko) made a report on the status of the investigations into associative production of the top quark and the Higgs boson. Since this Higgs boson production channel has not been observed yet, the projected research seems to be promising from the point of view of both the investigations of the Standard Model and the search for new physics in the experiments at the LHC.More photos
On 26 April 2018, a working session on establishment of the JUNO Data Analysis Center at JINR was held at DLNP. The JINR data center together with the computational facilities of CNAF (Italy) and CNRS (France) will form a basis for JUNO data transfer, storage, and analysis. The participants in the session were G. Ranucci and G. Andronico from INFN (Italy), D.V. Naumov, M.O. Gonchar, A.I. Fat’kina, A.V. Chukanov, and K.A. Treskov (DLNP), N.A. Balashov and N.A. Kutovsky (LIT).
Darina Zavazieva (TPU) speaks about her scientific methodological seminar held at DLNP on 26 April 2018
A coordinate detector section is built and put into operation at the Colliding Beams Division, DLNP, for constructing coordinate detectors of the bulk MicroMegas type.
Space detector TUC: two years of operation in the orbit. Seminar by Andrei Grinyuk and Maria Lavrova on 25 April 2018
The TUC detector was launched on board the Lomonosov satellite from the Vostochny Cosmodrome and put into the sun-synchronous orbit on 28 April 2016. Measurement of the spectrum, mass composition, and anisotropy of the Ultrahigh-Energy Cosmic Rays (UHECRs) with the energy E ~ 10^20 eV (1000 times higher than the LHC energy) and search for UHECR sources are among the most important tasks of high-energy astrophysics.
On 19–21 April 2018, the Daya Bay Analysis Workshop is held at the IHEP in Beijing. The results to be presented in the summer are discussed.
Daya Bay is the first experiment to discover disappearance of reactor electron neutrinos because of mixing with the third mass state at the confidence level of more than five standard deviations and the first reactor experiment to measure neutrino mass splitting Δm²₃₂. Up to date, the Daya Bay measurements of both parameters are best in precision. Eight identical detectors, each with 20 t of liquid gadolinium scintillator, are used in the experiment. The detectors are located on three experimental sites and measure the flux and spectrum of electron antineutrinos coming from six nuclear reactors with a total heat power of 17.4 GW. The characteristic distances between the reactors and the detectors are 500 m, 600 m, and 1.5 km.
The workshop on the JUNO Top Tracker at DLNP entered its second day. JINR has been participating in the JUNO collaboration for about three years. In 2020, the reactor neutrino experiment is to be launched in China. Now the construction of the Jiangmen Underground Neutrino Observatory is well under way 150 km away from Hong Kong. The experimental hall will be 700 m underground. The detector filled with 20 000 t of liquid scintillator will be viewed by about 18 000 photomultiplier tubes 20 in. in diameter and 25 000 photomultiplier tubes 3 in. in diameter to detect scintillation light resulting from antineutrino interactions in the detector. The main goal of the experiment is to determine the neutrino mass hierarchy by precision measurement of neutrino oscillations.
Lecture “DLNP Science and Technology Programme” by D.V. Naumov for trainees from the JINR Member States
On 19 April 2018, Dmitri Vadimovich Naumov gave the lecture “DLNP Science and Technology Programme” in the DLNP conference hall for the trainees from the JINR Member States within the framework of the 6th International Practical Training “JINR Experience for the Member States and Partner States” (JEMS). The participants came from Vietnam (University of Dalat, Dalat Nuclear Research Centre), Italy (INFN), Cuba (Cuba’s Isotope Center), Russia (North-Ossetian State University, Moscow Institute of Steel and Alloys), and South Africa (IThemba LABS).