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Search Results: 1 - 10 of 288285 matches for " O. D. Dalkarov "
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On the nuclear reactions with participation of near-threshold baryon resonances
O. D. Dalkarov
Physics , 2007,
Abstract: The main features of nuclear reactions with participation of baryon resonances ($\Delta$(1232), S(1535) and $\Lambda$(1405)), which are interpreted as a manifestation of the bound states of nucleus and corresponding meson are discussed.
On the production mechanism of Sigma-hypernuclear systems in A(K-,pi+-) reactions
O. D. Dalkarov,V. M. Kolybasov
Physics , 1999, DOI: 10.1134/1.855649
Abstract: It is shown that the new data on the excitation energy Eex spectrum of the residual nuclear system in the Sigma-hypernuclear region in the reactions (K-,pi+-) on Be-9 and in the reaction (K-,pi+) on He-4 and C-12 can be described without the supposition on the existence of excited Sigma-hypernuclear states. The basis is formed by a simultaneous consideration of the quasi-free Sigma production and Sigma-nuclear rescattering (elastic and with Sigma -> Lambda conversion) with account of interference of the respective amplitudes. For final decision of the question about the nature of the irregularities in Eex spectrum, it is proposed to study the picture corresponding to the so-called moving complex singularity of the triangle graph with Sigma rescattering: the position and the width of the peak in Eex distribution must appreciably change with momentum transferred from the initial kaon to the final pion.
Regularization of singular terms in $N\bar{N}$ potential model
O. D. Dalkarov A. Yu. Voronin
Physics , 2004,
Abstract: We suggest a method of singular terms regularization in potential model of $N\bar{N}$ interaction. This method is free from any uncertainties, related to the usual cut-off procedure and based on the fact, that in the presence of sufficiently strong short-range annihilation $N$ and $\bar{N}$ never approach close enough to each other. The effect of mentioned singular terms of OBE potential, modified by annihilation is shown to be repulsive. The obtained results for S- and P-wave scattering lengths are in agreement with existing theoretical models.
The optical model of $N\bar{N}$ interaction without cut-off
A. Yu. Voronin,O. D. Dalkarov
Physics , 2004,
Abstract: We suggest a regular potential model of $N\bar{N}$ interaction without any cut-off. The effect of singular terms of OBE potential, modified by annihilation is shown to be repulsive. The experimental data for S- and P-wave scattering lengths are well reproduced.
On the gravitational quantum states of helium atoms in the gravitational field of a cold neutron star
O. D. Dalkarov,E. A. Kupriyanova
Physics , 2015,
Abstract: A study of gravitational properties of matter presents a fundamental interest. The possibility of investigation of quantum gravitational states of matter by the example of helium atom is shown. The capability of the existence of helium quantum states in the gravitational field of a cold neutron star is examined. Observation of such states is done with the help of rotating neutron star's magnetic field. Periodically changing magnetic field induces transitions between gravitational states of helium atom and leads to the appearance of gravitational transitions' spectral lines in gigahertz frequency range.
Electromagnetic form factors of hadrons in the time-like region
Dalkarov, O. D.;Khakhulin, P. A.;Voronin, A. Yu.
High Energy Physics - Phenomenology , 2008,
Abstract: Hadron electromagnetic form factors of hadrons in the time-like region at the boundary of the physical region is considered. The energy behaviour of the form factor is shown to be dominantely determined by the strong hadron-antihadron interaction. The scattering length imaginary part for $p-\bar{p}$, $\Lambda-\bar{\Lambda}$, $\Sigma^0-\bar{\Sigma^0}$ are evaluated. We propose experiments to extract the information on the nearthreshold baryon-antibaryon interaction by using of hadron form foctors.
On the electromagnetic form factors of hadrons in the time-like region near threshold
O. D. Dalkarov,P. A. Khakhulin,A. Yu. Voronin
Physics , 2009, DOI: 10.1016/j.nuclphysa.2009.11.015
Abstract: Hadron electromagnetic form factor in the time-like region at the boundary of the physical region is considered. The energy behavior of the form factor is shown to be determined by the strong hadron-antihadron interaction. Imaginary parts of the scattering lengths for $p\bar{p}$, $\Lambda\bar{\Lambda}$, $\Lambda\bar{\Sigma}^0 (\bar{\Lambda}{\Sigma}^0)$ and ${\Sigma}^0\bar{\Sigma}^0$ are estimated. Developed approach enables us to estimate imaginary part of the scattering volume from $D^*\bar{D^*}$ experimental data. The form factor energy behavior away from the threshold is obtained within a semiphenomenological model of hadron-antihadron interaction.
Investigation of heat release in the targets during irradiation by ion beams
O. D. Dalkarov,M. A. Negodaev,A. S. Rusetskii
Physics , 2015,
Abstract: The DD-reaction is investigated and the heat emission off the targets during their irradiation with ion beams is studied at the HELIS ion accelerator at LPI. The heat emission is observed to be significantly higher in the case of irradiation of the Ti/TiO2:Dx-targets by a D+ beam, as compared to the H+ and Ne+ beams. Furthermore, it depends on the concentration of deuterium in the target and current density of the deuteron beam.
Resonance spectroscopy of gravitational states of antihydrogen
A. Yu. Voronin,V. V. Nesvizhevsky,O. D. Dalkarov,E. A. Kupriyanova,P. Froelich
Physics , 2013, DOI: 10.1007/s10751-014-1023-x
Abstract: We study a method to induce resonant transitions between antihydrogen quantum states above a material surface in the gravitational field of the Earth. The method consists in applying a gradient of magnetic field which is temporally oscillating with the frequency equal to a frequency of a transition between gravitational states of antihydrogen. Corresponding resonant change in a spatial density of antihydrogen atoms can be measured as a function of the frequency of applied field. We estimate an accuracy of measuring antihydrogen gravitational states spacing and show how a value of the gravitational mass of the antihydrogen atom can be deduced from such a measurement.
Observation of neutron emission in the process of X-pinch
O. D. Dalkarov,A. S. Rusetskii,S. A. Pikuz,T. A. Shelkovenko,I. N. Tilikin
Physics , 2015,
Abstract: The results of measuring the neutron flux in the process of the X-pinch are presented. The measurements were carried out using CR-39 track detectors. It was found that in the process of X-pinch recorded neutron emission over a wide energy range (from thermal to energies greater than 10 MeV) with an intensity of more than 108 neutrons per shot into 4{\pi} sr solid angle (assuming isotropy of radiation and localizing the source in the "hot spot"). Data of track detectors suggest that at the time of discharge produced fast neutrons are then slowed down and turned into thermal.
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