The total cross section of the interaction of deuterons polarized transversely with respect to the beam direction with the polarization Py and a tensor-polarized deuteron target with the polarization Pxz is a null-test signal of the effect of violation of invariance with respect to time reversal (T) while conserving spatial (P) parity. This effect is very similar to that expected in double...
The results of iron fragmentation on different targets at energy 230 MeV/nucleon are presented. Experimental data were obtained with the FRAGM experiment and TWA heavy ion facility, which has a unique opportunity to measure the momentum distribution of fragments with high resolution at small angles [1,2]. In contrast to the typical fragmentation, where the momentum spectra have Gaussian-like...
Experimental results on spatial correlations of charged particles in Xe+W interactions at the energy of 3 GeV/nucleon obtained at the Nuclotron internal target station are presented. The simulation of the detectors of the experimental setup has been performed using the Geant4 software package and the PHQMD (Parton-Hadron-Quantum-Molecular Dynamics) event generator.
ะ ัะฐะฑะพัะต ะฐะฝะฐะปะธะทะธัััััั ะฝัะบะปะพะฝ-ะฝัะบะปะพะฝะฝัะต ะฒะทะฐะธะผะพะดะตะนััะฒะธั $pn \to d\pi^0\pi^0$, $pn \to d\pi^+\pi^-$ ะธ $pp \to d\pi^+\pi^0$ , ะฒ ะบะพัะพััั
ะฒ ะบะพะฝะตัะฝะพะผ ัะพััะพัะฝะธะธ ะพะฑัะฐะทัะตััั ะดะตะนััะพะฝ ะธ ะฟะฐัะฐ ะฟะธ-ะผะตะทะพะฝะพะฒ. ะะผ ะฟัะพัะธะฒะพะฟะพััะฐะฒะปััััั ะบะพะฝะตัะฝัะต ัะพััะพัะฝะธั ั ะฟะฐัะพะน ัะฒะพะฑะพะดะฝัั
ะฝัะบะปะพะฝะพะฒ.
ะะพะปััะตะฝะพ ัะบัะฟะตัะธะผะตะฝัะฐะปัะฝะพะต ะฟะพะดัะฒะตัะถะดะตะฝะธะต ัะพัะผัะปั, ะฒะปัััะตะนัั ัะปะตะดััะฒะธะตะผ ัะพั
ััะฐะฝะตะฝะธั ะธะทะพัะฟะธะฝะพะฒ
$\sigma(d\pi^+\pi^-)$=...
The report will give a brief overview of the experimental results of the relativistic fragmentation of $^{7,9}$Be, $^{10}$B, $^{10,12}$C in the Becquerel project in JINR. The fragmentation of a large variety of light nuclei was investigated using the emulsions exposed to few A GeV nuclear beams at JINR Nuclotron-NICA complex . A nuclear track emulsion is used to explore the fragmentation of...
Abstract
First physics results of the BM@N experiment at the Nuclotron/NICA complex are presented on studies of proton , deuteron and triton production in interactions of an argon beam with fixed targets of C, Al, Cu, Sn and Pb at 3.2 AGeV. Transverse mass distributions, rapidity spectra and multiplicities of protons, deuterons, tritons are measured. The results are treated within a...
The Bi-Bi collisions at $\sqrt{s_{NN}} = 9.0$ GeV are simulated within the PHSD transport model. After spectators separation and fluidization procedure, the velocity and vorticity fields are calculated. Then, the global polarization for different hyperon species is evaluated, and its dependence on the momentum, rapidity, and centrality is analyzed. Finally, the correlations of the polarization...
Author: A.A. Zaitsev (JINR)
Abstract: Since the discovery of the nuclear component of cosmic rays, the nuclear photoemulsion (NTE) method has made it possible to study the composition of relativistic fragmentation of nuclei at high-energy accelerators. The promising potential of the relativistic approach to the analysis of ensembles of fragments manifested itself in layers of NTE...
In ultraperipheral collisions (UPC) of relativistic nuclei without overlap of their nuclear density distributions the collision partners are mutually impacted by Lorentz-contracted Coulomb fields [1]. This leads to a variety of processes induced by equivalent Weizsรคcker-Williams photons. In particular, large neutron emission cross sections ($\sim 200$ b) were measured in the ALICE experiment...
A.T. D'yachenko$^{1,2}$
$^1$ Emperor Alexander I Petersburg State Transport University, St. Petersburg Russia;
$^{2}$ B.P. Konstantinov Petersburg Nuclear Physics Institute of National Research Center โKurchatov Instituteโ, Gatchina, Russia
In development of the nonequilibrium hydrodynamic approach [1,2], we were able to successfully describe [3] the double differential cross sections...
The recent results of exposure of a nuclear track emulsion (NTE) in a mixed hadron beam is discussed. The purpose of this work is to search and measure the length of short-range tracks of alpha particles produced in the interactions of hadrons and nuclei from the composition of a NTE. Modeling the ionization losses of alpha particles in the substance of a NTE in the SRIM program made it...
The study of the high-density equation of state (EoS) and the search for a possible phase transition in dense baryonic matter are one of the main goals of beam energy scan programs with relativistic heavy ion collisions at energies $\sqrt{s_{NN}}$=2-5 GeV.
The results of performance study for the differential anisotropic flow measurements of identified charged hadrons at energies...
We study the yields of pions and protons with large transverse momenta at mid-rapidities in the region that is kinematically inaccessible for single nucleon-nucleon interactions (the so-called cumulative region), which may be observed in nuclear collisions by MPD and SPD detectors of the NICA complex. We assume that particles in this kinematic region are formed as a result of scattering from...
Neutron production double-differential cross section was measured for $^{124}\text{Xe}$ + CsI collisions at energy 3.8 A GeV with a compact TOF spectrometer as a part of BM@N setup at external beam channel of the Nuclotron. The aim of this study is to obtain new experimental results on neutron emission from excited spectators of the target nuclei. The measurement was performed at angles ฮธ >...
Started in the late 1950s at DLNP JINR pioneering experimental studies of proton scattering on nuclei allowed D.I. Blokhintsev assumed the presence in nuclei a lower mass nucleus in a compressed state, i.e. the presence of a cold strongly compressed component in ordinary nuclear matter. The search and study of two- and three-nucleon systems in nuclei continued at DLNP JINR and ITEP (Moscow)...
Currently, studies of the properties of a strongly interacting medium in collisions of hadrons and nuclei are actively being carried out in experiments at accelerator complexes at BNL, CERN, and JINR. The NICA collider (Dubna) and the multipurpose detector MPD are expected to be put into operation soon. One of the primary research directions for these experiments involves scanning the phase...
Abstract โ A self-similarity approach to description of interaction of accelerated nuclei in the intermediate energy range is presented. This approach represents a relativistically invariant description of angular, energy, and A-dependences of inclusive hadron production cross sections in nuclear collisions. Special attention is paid to the description of cumulative, subthreshold processes at...
The report presents the performance of the BM@N Scintillation Wall (ScWall) achieved during the first physics run at the Nuclotron accelerator with Xe+CsI at 3.8 AGeV collisions. The report is devoted to the design of the ScWall and its capability to differentiate charged fragments produced in nucleus-nucleus collisions. The measured charge spectrum and the ability of the ScWall to measure...
The ratio of neutron to proton densities increases toward the periphery of heavy nuclei. While this leads to a subtle difference (~0.5 fm) in the mean square radii of neutrons and protons, the thickness of such a neutron skin (NS) is very sensitive to the nuclear symmetry energy term in the equation of state (EOS) of nuclear matter important for both nuclear physics and astrophysicsย [1]. There...
In December, 2022 - January, 2023 the BM@N experiment performed
its first physics run with full configuration. Over 400 million
events of Xe+CsI interactions with the Xe beam kinetic energy of
3.8A GeV were collected.
Since then, the collaboration put strong efforts to reconstruct and
analyze collected data. The current status of this activity will
be presented with the emphasis...
Abstract โ Application of the Lobachevsky geometry for solution of some problems in relativistic nuclear physics is discussed. Geometric description of the problem of particle production and the idea of โelementary particleโ is considered. The geometric properties of particle distributions in relativistic nuclear reactions and the new regularities based on the properties of the Lobachevsky...
The anisotropic collective flow is one of the important observable sensitive to the equation of state (EOS) and transport properties of the strongly interacting matter created in relativistic heavy-ion
collisions. In this work we discuss the recent flow measurements from the Beam Energy Scan programs at SIS, SPS and RHIC and anticipated performance of the BM@N and MPD experiments at Nuclotron-NICA.
Quark gluon plasma (QGP) is a deconfined state of matter, which exists at the temperatures T>170 MeV and energy densities ฯต~1 GeV/fm$^{3}$. Initially it was thought that such conditions can be reached only in the relativistic heavy ion collisions (e.g. Au+Au, Cu+Cu, Cu+Au and U+U collisions), while in small collision systems such as p+Al, p/d/$^{3}$He+Au conditions are not sufficient for QGP...
In nucleon-nucleon collisions there are processes: diffraction dissociations of projectile nucleon (PrD), dissociation of target nucleons (TrD), meson exchange processes (ME) and non-diffractive interactions. Correspondently, $\sigma^{in}\ =\ \sigma_{PrD} + \sigma_{Trd} + \sigma_{ME} + \sigma_{ND}$. Perhaps there is only one possibility to estimate these cross sections in reggeon approach....
The Multi-Purpose Detector (MPD) is the main heavy-ion experiment of the NICA complex under construction at JINR. With collisions of heavy-ions in the energy range $\sqrt{s_{NN}}=4-11$ GeV, MPD will scan the region of high net baryon density of the QCD phase diagram to look for the critical end point and study the first order phase transition predicted to occur in that region. The...
Recently, the NA61/SHINE collaboration has presented experimental data on $K^0_s$ meson productions in proton-proton interactions at projectile momenta ($P_{lab}$) of 31, 40 and 80 GeV/c [1]. Earlier, the collaboration obtained the analogous experimental data at
$P_{lab}$=158 GeV/c [2]. As it was shown in [1,2] , there are no Monte Carlo models that can well describe all the experimental...
The Inner Tracking System (ITS) of the Multipurpose Detector (MPD) will be a vertex silicon detector designed for the efficient registration of short-lived products of nucleusโnucleus interactions and it is planned to be built using the novel technology of monolithic active pixel sensors (MAPS) following the corresponding know-how and technological transfer from CERNโs ALICE-ITS upgrade...
Baryonic Matter at Nuclotron is a fixed target experiment designed to probe the properties of the strongly interacting matter at the region of high baryonic densities. We report a feasibility study for measuring the directed and elliptic flow with respect to spectator symmetry plane for the recent physical run at the BM@N facility. The new results will extend the existing data available from...
In the present work the source characteristics of multifragmentation are investigated for the p+Au collisions at 2.1 GeV. Beam of 2.1 GeV protons were obtained from the Dubna superconductind accelerator NUCLOTRON. Source velocities of carbon and lithium fragments were measured with the 4-pi device FAZA.
It was found decreasing source velocities as the charge of fragment is decreasing.
...
The BECQUEREL experiment is aimed at solving topical problems in nuclear clustering physics. The used method of nuclear track emulsion (NTE) makes it possible, due to its unique sensitivity and spatial resolution, to study in a unified approach multiple final states arising in dissociation of relativistic nuclei. Currently, a research focus is on the theoretical concept of ฮฑ-particle...
The experiment on photodisintegration of tensor-polarized deuteron is in progress. It is carried out at VEPP-3 storage ring using the internal polarized gas target technique. The component of tensor analyzing power T20 is obtained by measurement of the target polarization asymmetry for deuteron photodisintegration in the photon energy range 400 โ 640 MeV. Photon energy is defined by the system...
The paper generalizes the four-particle integral Faddeev-Yakubovsky equation to the
relativistic case. The obtanied system of integral equations is solved by the iteration method
and the binding energy and amplitudes of states of the helium-4 nucleus are found. The rank-
one separable Yamaguchi potential is used as the NN interaction potential. In the calculations
the only states with zero...
To solve difficult problems of nuclear spin physics like the proton spin crisis physicists should perfectly understand what spin is. There are a few correct definitions of the relativistic spin operators [1]: Dirac spin definition and two Foldy-Wouthuysen spin definitions coupled with the center-of-charge and center-of-mass position operators. The conventional definition explicitly or...
ะ ะฐะทัะตัะตะฝะธะต ะฒ ะฟัะพัะตััะต ะพัะพัะผะปะตะฝะธั, ะฟะพััะพะผั ะฑัะดะตั ะฟัะธะบัะตะฟะปะตะฝะพ ะฟะพะทะถะต.
The interplay between different theoretical descriptions of nuclear matter is considered. The statistical approach based on Zubarev density matrix appears to be dual to the geometrical one based on conical singularities for accelerated media. The new phase transition in accelerated media is predicted in both approaches which may explain the hadronization and fast thermalization.
We explore the ground state energy behaviour of the vector $K^*$ mesons in external abelian magnetic field of QCD scale in SU(3) lattice gauge theory. We calculate the magnetic polarizability of the neutral and magnetic moment of the charged $K^{*}$ mesons by background field method and investigate the dependence of these physical quantities from the value of $m_s/m_d$ ratio.
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\textbf{LXXIV International conference Nucleus-2024: Fundamental problems and applications}
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\noindent Abstract ID:
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\textbf{PROMPT PHOTON...
