Zatsepin readings
June 2, 2023, Moscow, INR
9:50
Greeting
Grigory
RUBTSOV
10:00
Milky Way in the neutrinos of high energies - observations and interpretation
✔ galactic anisotropy of neutrino arrival directions above 200 TeV (4.1 sigma;)
✔ (28±9)% of astrophysical track neutrinos above 200 TeV
✔ probably, the galactic contribution is also present at lower energies
✔ the width of the Milky Way in neutrinos is almost 40 degrees! Close sources?
✔ local observations of cosmic rays do not reflect the average for the Galaxy
✔ KRAγ templates or similar – can be misleading
Sergey
TROITSKY
10:30
Streams of solar neutrinos and potassium geo-antinewinerino from the phase III experiment of Borexino
• The presence of potassium in the Earth in the amount of 3 ÷ 4% of the Earth's mass is sufficient to explain the heating of the ocean observed in the ARGO experiment
• A method of radiogenic heat transfer to the ocean through the formation of silane gas at depths of 10 km during the release of hydrogen from the Earth is proposed
Leonid
BEZRUKOV
Ivan
KARPIKOV
Valery
SINEV
11:00
On the scientific program of the Baksan neutrino observatory
Valeriy
PETKOV
11:30
The latest results in the search for dark photons
• The method has shown its effectiveness, the results obtained are included in the world data compilation PDG 2020/2022
• Observation (if successful) of diurnal variations with characteristic time symmetry forms the evidence base for the existence of dark photons with a certain polarization and will allow determining the direction of the electric or magnetic field vector in the solar or stellar coordinate system
• To obtain a significant result for daily variations, it is necessary to carry out measurements with an active detector for several years, further increasing the accuracy of measurements is possible by increasing the number of detectors and, accordingly, scaling the entire experiment
• The work can be carried out by independent groups in different laboratories at different geographical latitudes
Anatoly
KOPYLOV
Igor
OREKHOV
Valery
PETUKHOV
coffee-break
12:30
Semi-exclusive sections of scattering neutrinos charged and neutral currents on the argon and the search for oscillations in sterile neutrinos
★ The semi-exclusive differential cross sections integrated over the BNB spectrum, as a function of the reduced neutrino energy, are calculated without and taking into account neutrino oscillations with sterile neutrinos at a distance of 600 m from the target. Calculations were carried out within the framework of a 3+1 model with the values of the oscillation parameters 1 ≤ Δm241 ≤ 5 эВ2 и 0.09(0.085) ≤ sin2νµ(νs) ≤ 0.25(0.245)
★ It is shown that the dependence of the ratio of the cross sections Rσ on the neutrino energy recovered by the kinematics of the SBN experiment is sensitive to the values of the parameters of oscillations with a sterile neutrino with masses of the order of 1 eV
★ The ratio of the cross sections Rσ (Erec) can be used to search for the effects of oscillations with light sterile neutrinos and to estimate the values of the parameters of these oscillations
Anatoly
BUTKEVICH
13:00
Dark matter, accelerated with elastic interaction with cosmic rays, and the sensitivity of the emulsion detector Newsdm
• Angular distributions of recoil nuclei (CNO) on the Earth's surface and at the level of the GranSasso underground laboratory
• Ground Level (Assergi). Conclusion: directional tracks make sense to consider for the mass range DM 1 keV — 10 MeV
• Comparison of the number of recoil core tracks in the direction of the Center of the Galaxy and in the perpendicular direction (in the plane of the Galaxy)
Anna
ANOKHINA


MSU
Vladimir
GALKIN


MSU
14:30
Moon-month variations of gamma quanta as a background for a neutrinum experiment LVD
★ We have detected a modulation of radon concentration associated with lunar-monthly cycles. The phase of ascent falls on the days of the full moon. The amplitude of variations varies from 0.5 to 0.8 %. We explain this modulation by the deformation of the earth's crust. Locally different stress fields can be explained by changes in pore pressure associated with the rise of deep flows in the Earth's crust
Natalya
AGAFONOVA
Ekaterina
DOBRYNINA
Natalya
FILIMONOVA
Irina
SHAKIRYANOVA
coffee-break
15:00
Some results of the LHAASO experiment
✔ The LHAASO experiment has no analogues and it is unlikely that it will have competitors in the coming years.
✔ Even with only a part of the installations operating, outstanding results have already been obtained there.
✔ In the near future, we should expect new discoveries in various fields of knowledge – in astrophysics, in astronomy, in cosmology, in the physics of cosmic rays, in the search for dark matter, etc.
✔ The participation of Russian scientists from the INR RAS in this Mega-Science class experiment with its own installation (ENDA) is of fundamental importance and needs comprehensive support.
✔ 43 sources are detected with ultra-high energy (E > 100 TeV) emission at > 4σ CL
✔ There are PeVtrons working in our galaxy!
✔ The energy spectra of gamma quanta from some sources in the range of 0.1 - 1.5 PeV have been measured
✔ The measured spectra indicate the hadron nature of the detected gamma quanta (at least in some sources)
✔ This means that accelerators are working in our galaxy, accelerating charged particles (CR) at least up to 15-20 PeV
✔ Eight out of the forty-three UHE sources are not detected at the 1-25 TeV range, representing a new class of gamma-ray sources dominated by emission above tens of TeV
✔ Thirty-five 1LHAASO sources are associated with energetic pulsars
✔ Supernova remnants are most likely not suitable as sources of ultrahigh energy CR sources. It is necessary to look for new mechanisms of acceleration of CR
Yury
STENKIN
15:30
Is it possible to evaluate the parameters of the 2D-fluctuations of the signature of the metric of space?
Within the framework of the assumption of the connection of anomalous azimuthal correlations observed in experiments in cosmic rays and at the LHC with local 3D ↔ 2D fluctuations of the signature of the space metric, it is proposed
• to study in detail the kinematic history of each interaction (including the generation of resonances and their decays into mesons and gamma quanta) at high and ultrahigh energies;
• try to estimate by azimuthal correlations the phenomenological parameters of possible local fluctuations of the metric signature: the characteristic dimensions and lifetime of the 2D region, L2D and τ 2D, respectively
• continue to study the azimuthal characteristics of energy flows in the trunks of the SHAL
• try to confirm or refute the existence of local 3D ↔ 2D fluctuations of the signature of the space metric
Rauf
MUKHAMEDSHIN
16:00
Element-containing scintillers for detecting rare events
• At high metal loading, the light output of the scintillator when using metal carboxylates is significantly higher than when using beta-diketonates. The light output with beta-diketonates has high values only at a concentration of 1-2 g/l on metal.
• The light output of scintillators with injected beta-diketonates does not depend on the terminal groups of beta-diketones and additional ligands, as well as on the nature of the metal, but is determined solely by the structure of the beta-diketonate itself.
• But the nature of the metal can affect the attenuation length of the scintillator light. Thus, Nd ions have many absorption bands in the visible and ultraviolet regions, which will affect the absorption of light when using any of its compounds and any solvents.
• The light output depends on the solvent, the higher the proportion of aromatic hydrocarbons, the higher the light output. The use of mixtures of marginal hydrocarbons with aromatic ones can increase the stability and attenuation length of the scintillator light.
• Metal carboxylates should be well dried under vacuum over KOH before dissolution. Beta-diketonates are purified by sublimation.
• The finished scintillator must be passed through a Pall filter (0.05-1 microns), purged with purified inert gas and stored under it
Galina
NOVIKOVA
16:15
Scaling technologies for obtaining metal-containing liquid organic scintillers
• Purification of 3,5,5-trimethylhexanoate gadolinium was carried out by dissolution in tetrahydrofuran (THF) followed by filtration. At the same time, an insignificant amount of hydrolysis products that are part of the initial salt are separated, since they are not soluble in THF. THF is a cyclic ester, dissolves 3,5,5-trimethylhexanoate gadolinium well, solutions with a concentration of up to 100 g / l have a viscosity that allows filtering through filters of 5-8 microns. Since THF is a volatile and highly flammable liquid, all operations to move the solution were carried out using diaphragm pumps powered by compressed air. All the equipment used to work with TGF was explosion-proof.
• Gd(TMHA)3 solution purified from insoluble impurities was mixed with LAB in glass reactors with a volume of 100 liters equipped with a vacuum distillation system, the vapor condensers were cooled with water at a temperature of 5 °C. With a stepwise decrease in pressure and a temperature of 45-59 °C, and continuous transmission of high-purity argon through the solution, THF distillation was carried out. At the same time, a solution of gadolinium salt was formed in the LAB. The distilled THF after additional purification was again used in technological operations. After THF removal is completed (~23-25 hours) fluorescent components and DIN were added to the solution. Then the finished product was packaged in a stainless steel container with a volume of 200 liters in a protective argon atmosphere. The productivity of the periodic process ranged from 800 to 1200 liters per week. In total, more than 10,000 liters of scintillation solution were produced.
Alexey
NEMERYUK


RRC KI
Anatoly
RAZINOV


RRC KI
Ivan
KOVTUN


RRC KI
16:30
Completion
Natalya
AGAFONOVA
?