April 3, 2025 year, 14:30 Joint Seminar HEPD - TPD |
A.N. Fazliakhmetov
(INR RAS, Moscow) |
Study of neutrino interaction with nuclei 71Ga, 76Ge, 127I, 128,130Te.
Abstract:
Calculations of cross-sections and capture rates of neutrinos with energies <20 MeV (from the Sun) by nuclei 71Ga, 76Ge, 127I, 128,130Te are discussed. The interest in these isotopes is related to the possibility of their use as targets in detectors of existing and planned international neutrino experiments aimed at searching for the process of double neutrinoless beta decay (SNO+ experiment — 128,130Te isotopes, LEGEND — 76Ge isotope), dark matter, sterile neutrinos (BEST experiment — 76Ge isotope), registration of coherent neutrino scattering (COHERENT experiment — 127I isotope), etc. The interaction of neutrinos from the Sun with the nuclei of the detector target can imitate the target signal of the experiment. Detection of neutrinos from the Sun is one of the goals of the Baksan Large Neutrino Telescope (BLNT) project.
For the nuclei under consideration, the calculations of the neutrino capture cross sections and rates were performed taking into account both discrete parts of the nuclear excitation spectrum based on the latest measurement data in charge-exchange reactions, and the calculations made for the first time, taking into account the contribution from nuclear resonances obtained from processing the experimental data on charge-exchange reactions. A comparison was made with calculations based on the microscopic theory of the nucleus. It was shown that for 76Ge, 127I, 128,130Te, taking into account the resonance structure significantly (up to 2 times for 128Te) increases the final rate of solar neutrino capture. For the BLNT, the number of events from solar neutrino capture was estimated when adding 128,130Te isotopes to the detector target.
(based on the PhD thesis).
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April 1 of 2025 year, 10:30 |
S.V. Chenmaryov
(HEPD PNPI) |
Mass measurments of the transuranium nuclides in the vicinity of the neutron number N=152 on the TRIGA-TRAP trap setup.
Abstract:
The current state of the TRIGA-TRAP ion trap system
and the current results obtained on it are presented.
The TRIGA-Mainz reactor and the TRIGA-Spec coupling
system are described. A brief description of the
operating principles of Penning traps and methods
for determining the ion eigenmotions frequencies
in the trap are given. An overview of the new design
of the TRIGA-TRAP trap is given, as well as an
examination of its systematic error in determining
the masses. An overview of the current results
of measuring masses of the transuranium nuclides
in the vicinity of the neutron number N=152
on the TRIGA-TRAP trap is given.
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March 27, 2025 year, 14:30 Joint Seminar HEPD - TPD |
A.P. Serebrov
(PNPI NRC KI) |
Left-right model of weak interaction with CP-violation, CP-violation in baryons and K-mesons, baryon and lepton asymmetry of the Universe.
(Presentation)
Video
Abstract:
In connection with the analysis of the experimental situation with neutron decay, the left-right model of weak interaction is continued considering CP-violation.
CP-violation in baryons is found at the 2 sigma level. It is shown that it is possible to describe the effects of CP-violation in decays
of neutral K-mesons using the parameters of the left-right model, which are extracted from neutron decay.
Thus, the left-right model of weak interaction, extended by CP violation, allows, within the limits of the available accuracy,
to describe the effects of CP violation in baryons and mesons. Different signs of baryon and lepton CP-violating asymmetry
are associated with different signs of baryon and lepton asymmetry of the Universe. B-L is conserved.
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March 25 of 2025 year, 10:30 |
E.A. Doroshkevich
(INR, RAS) |
Predictions, searches, and observation of dibaryon resonanses.
(Presentation)
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March 18 of 2025 year, 10:30 |
A.G. Olshevskiy
(JINR, Dubna) |
Study of Neutrino Oscillations in Accelerator and Reactor Experiments: Results and Prospects.
Abstract:
Review on the study of neutrino oscillations
at accelerators and reactors: results, current
state and prospects. Discussion of the accuracy
of the determination of oscillation parameters
and the main ingredients that determine this
accuracy. Prospects for current and near-future
projects, as well as plans and opportunities related
to the global interpretation of the world's
neutrino oscillation data.
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March 13, 2025 year, 14:30 Joint Seminar HEPD - TPD |
A.N. Ilyichev
(INP BSU, Minsk) |
Electromagnetic radiation effects in lepton-proton scattering.
Abstract:
Since leptons have spin and they are point-like particles, their scattering off a proton is the most direct and accurate source of information
about the internal structure and spin properties of the proton. The main goal of such scattering consists in the study of the one-photon exchange contribution,
which leads to the necessity for the theoretical calculation of higher-order effects within a certain model and the removal of these effects
from experimental data. Often, such a procedure is performed at the level of event simulations with the emission of a hard undetectable photon,
which allows taking into account the features of the experimental setup. In this talk, some methods of calculation are presented,
and Monte Carlo simulations of electromagnetic radiation effects in the lepton-proton interaction are described for the following channels:
- elastic (lp → lp[γ]),
- semi-inclusive (lp → lhX[γ]),
- exclusive photon electroproduction (ep → epγ[γ]).
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March 6, 2025 year, 14:30 Joint Seminar HEPD - TPD |
Yu. Dokshitzer
(PNPI NRC KI) |
«Multipartice production in QCD, high-multiplicity trigger and CMS ellipticity».
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March 4 of 2025 year, 10:30 |
A.S. Barabash
(NRC KI) |
Neutrino mass: direct measurements and double beta-decay.
(Presentation)
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February 27, 2025 year, 14:30 Joint Seminar HEPD - TPD |
L. David Roper (Prof. Emeritus of Physics, Virginia Polytechnic Institute and State University) and Igor Strakovsky (GWU)
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Baryon and Meson Excited States.
(Presentation)
Video
Abstract:
The masses of seventeen baryon sets and twenty-four meson sets of three or more equal-quantum excited states are fitted by a simple two-parameter
logarithm function, Mn = a Ln(n) + b, where n is the level of radial excitation. The conjecture is made that accurately measured masses
of all equal-quantum baryons (including LHCb exotic Pc-bar-c) and meson excited states
(including s-bar-s, s-bar-c, c-bar-c, c-bar-b, and b-bar-b states) are related by the logarithm function used here,
at least for the mass range of currently known excited states. Thus, a universal mass equation for equal-quantum excited-state sets is presented.
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February 25 of 2025 year, 10:30 |
G.E. Gavrilov
(HEPD PNPI) |
The nature of spontaneous self-sustained current sources in multiwire proportional chambers of LHC experiments.
(Presentation)
Video
Abstract:
Over a long period of operation, large current spikes have
repeatedly occurred in many multiwire proportional chambers
(MWPCs) at the LHC, causing the emergency shutdown of the high-voltage
power supply. In most cases, the behavior of the current is typically
characterized by a spontaneous nature and point localization,
which is comparable to the Malter effect. Numerous life tests
of laboratory and full-scale MWPC samples of the CMS and
LHCb experiments have shown that even the accumulated charge
on anode wires equivalent in magnitude to 30-50 years of
operation in the experiment does not lead to the failure
of the detectors or the emergence of spontaneous self-sustaining
currents. It became obvious that the nature of sources
of such currents is associated with the unique operating
conditions of an MWPC in the LHC experiment. Results of
the complex studies of MWPCs, where spontaneous currents
of tens of microamperes regularly appeared, show that
nanocarbon graphite-like structures are formed on
the detector cathodes. It is the nanocarbon structures
on the copper foil of the cathode that cause spontaneous
self-sustained currents in an MWPC.
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February 20, 2025 year, 14:30 Joint Seminar HEPD - TPD |
Yu.F. Pirogov, O.V. Zenin
(NRC KI -- IHEP) |
Quartet-metric gravity and scalar graviton dark holes.
Video
Abstract:
In the framework of the quartet-metric gravity -- the concept of space--time with a metric extended by a set of selected dynamic
vacuum coordinates as analogues of gravitational Higgs fields, the so called ``dark holes'' merging a central black hole
and a peripheral scalar graviton dark halo are considered. It is shown that the dark holes may naturally explain asymptotically
flat rotation curves, attributed conventionally to the existence of some dark matter.
Possibilities of further modification of the basic dark holes, to convert them to more realistic ones for application in astrophysics
and cosmology, are discussed.
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February 18 of 2025 year, 10:30 |
V.P. Mitrofanov
(Lomonosov Moscow State University, Moscow) |
Gravitation waves and detection of them.
Video
Abstract:
A. Einstein predicted the gravitation waves in 1916
but they were observed for the first time by the LIGO
(Laser Interferometer Gravitational-Wave Observatory)
detector in 2015 from the collision of two black holes.
Up to now, the gravitation waves were detected
more than 200 times. Recently, new generation detectors
are developed which will permit to answer many fundamental
question in physics and astronomy.
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February 11 of 2025 year, 10:30 |
K.A.Кuzakov
(Lomonosov Moscow State University, Moscow) |
Status and prospects of the tritium neutrino experiment SATURNE.
Video
Abstract:
The Sarov Tritium Neutrino Experiment (SATURNE) is part of
the scientific program of the NCPhM and is currently
at the R&D stage. The experiment will employ a tritium
source of electron antineutrinos with an activity of
at least 10 MCi (1 kg of tritium) and possibly up to
40 MCi (4 kg of tritium). It is expected that measurements
using a He-4 detector in the superfluid state will allow for
the first time to observe coherent elastic neutrino-atom
scattering and to discover the neutrino magnetic moment μ_ν,
or to set a new record upper limit on its value at the level
of ~10^{-13} μB (90% C.L.). It is also planned to measure
the ionization channel of neutrino-atom interactions using
Si and SrI2(Eu) detectors with record-low energy thresholds
for the corresponding detection systems, which will allow
achieving sensitivity to the μ_ν value at the level of ~10^{-12} µB (90% C.L.).
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February 4 of 2025 year, 10:30 |
V.F. Obrazstov
(IHEP, Serpukhov) |
OKA Experiment. Results on Kaon Decays.
Video
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January 23, 2025 year, 14:30 Joint Seminar HEPD - TPD |
V.I. Sbitnev
(NRC KI - PNPI) |
Relic Majorana Fermions as Possible Candidates for Dark Matter Particles.
Abstract:
Among possible candidates for the role of dark matter particles, ranging from WIMPs
(weakly interacting massive particles) to ultralight axions, Majorana fermions occupy an intermediate position in this line
of candidates in terms of masses comparable to neutrino masses. The main paradigm underlying the derivation of the Majorana fermion
is Lambda + Cold Dark Matter - LambdaCDM (Cold Dark Matter). The resulting formula for the mass of the Majorana fermion contains three
key parameters - Planck's constant, the critical density distribution of dark matter, and the temperature of the relict
cosmic radiation (T = 2.725 K). The calculated mass of the fermion (~0.04 eV) gives good agreement with the experimentally measured
neutrino masses. This gives grounds to assert that Majorana fermions represent neutrinos. It follows from the formula that there may
be three generations of fermions, each of which shows differences in mass.
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January 21 of 2025 year, 10:30 |
V.P. Neznamov
(VNIIEF, Sarov) |
Quantum Models of Electron with Zero Self-energy.
Video
Abstract:
Two models of the electron with zero self-energy are proposed
on the basis of the modernized regular charged Reissner-Nordtstr$\"{o}$m
and Kerr-Newman metrics with quantum cores.
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January 16, 2025 year, 14:30 Joint Seminar HEPD - TPD |
A.N. Semenova
(NRC KI - PNPI) |
Teleparallel Theory of Gravity by Hayashi-Shirafuji.
(Presentation)
Abstract:
The generally accepted theory of gravity is Einstein's General Theory of Relativity (GTR),
where gravity is a consequence of the curvature of space-time due to the presence of matter.
Despite the great success of this approach, there are certain difficulties with quantizing GTR
and with describing Dark Matter within its framework. There is an idea to modify the theory of gravity in such a way
that the effects of Dark Matter can be described as purely gravitational.
One of the variants of such a modification is the teleparallel theory by Hayashi-Shirafuji,
where the main geometric characteristic is torsion, and the dynamic variable is a tetrad.
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