The fragment-separator ACCULINNA-II intended for secondary beam
separation has been operating at the U400M cyclotron since 2017. The separator
is equipped with detection system, including a neutron wall, zero-degree
spectrometer and a cryogenic target cell which may be fiiled with helium and
hydrogen isotopes, including tritium. Experiments are being carried out at the
separator are...
The talk is about methods and technologies of data processing in
heterogeneous computing environments in the context of Meshcheryakov
Laboratory of Information Technologies (MLIT) activities. The Multifunctional
Information and Computing Complex (MICC) of MLIT JINR is a key component of
the JINR network and information and computing infrastructure. The MICC is
regarded as JINR’s unique...
A recently developed theoretical model for the fission fragment yield
distributions, based on the nuclear energy density functional theory, will be
elaborated. The model is further extended to account for the odd-even staggering
in the fission fragments' charge yields. The predicted results for preactinides,
actinides, and superheavy nuclei will be presented and compared with the...
The quark constituents of the fireball created in relativistic heavy-ion
collisions carry intrinsic spin. Whether these spin degrees of freedom fully
thermalize remains an open question. Insights from kinetic theory suggest that spin
relaxes on a longer timescale compared to momentum. Polarization observables in
experiments offer valuable probes into this issue. While the assumption of...
We investigate how the intrinsic nature of fermionic dark matter (DM),
Dirac versus Majorana, affects the structure of compact stars. Incorporating DM
into a relativistic mean-field framework with a scalar portal coupling to nucleons,
we derive self-consistent equations of state and solve the
Tolman–Oppenheimer–Volkoff equations. Differences in internal degrees of
freedom lead Dirac DM to...
The reaction mechanisms have been investigated intensively in many
reactions with heavy ions. Several processes can take place at the interaction of
two colliding nuclei. The main of them are fusion-fission, quasifission, fast fission,
multinucleon transfer, the formation of the evaporation residue, deep inelastic
collisions and, finally, quasielastic and elastic scattering. A big set of...
We explore the structure, rotation, and non-radial oscillations of
anisotropic dark energy stars, by modeling the matter using a modified Chaplygin
equation of state and adopting the Bowers–Liang prescription for anisotropic
pressure. We first extend stellar equilibrium to slowly rotating configurations under
anisotropy, solving the structure equations to obtain mass, radius,...
In the present study, an overview of different reaction mechanisms
involved light and heavy ion induced reactions has been investigated at low
energies below 10 MeV/nucleon. In light ion reactions, an intermediate mechanism
so called pre-compound (PCN) emission which is bridging between compound
(CN) and direct reactions (DR) is attracted significantly due to its interplay between
nuclear...
We constrain the nuclear matter equation of state within the relativistic
mean field model by including the isoscalar-vector and isovector-vector coupling
term at a fundamental level using the Bayesian analysis. We used the nuclear
saturation properties and recent astrophysical observations to constrain the dense
matter equation of state. We obtained about 20000 sets of equations of states...
In this talk we discuss light and heavy mesons in the frame of the local
NJL-like models and in the frame of the quark model with separable interaction
kernel. The NIL-type model is known for its ability to describe the chiral symmetry
breaking and to describe the properties of matter at finite temperature and density.
However, the description of mesons within this model is limited by the...
This talk reviews the design and key features of the Baikal-GVD neutrino
telescope, which is the largest in the Northern Hemisphere. It is being constructed
in Lake Baikal, and has a detection volume approaching 0.7 km3 and is increasing
annually. Currently, the underwater installation consists of 4212 optical modules in
117 525-meter long strings. The modular design of the detector allows...
The main goal of the Multi-Purpose Detector (MPD) at NICA facility is to
study the structure of the QCD phase diagram at high baryochemical potential. To
achieve this goal, the MPD will study heavy-ion collisions in a wide energy range of
2.4-11 GeV. By measuring a wide range of signals from heavy-ion collisions, the
MPD will investigate various physics phenomena, including the equation of...
The Spin Physics Detector collaboration intents to perform a
multipurpose experiment foreseen to run at the NICA collider (JINR, Dubna). The
main purpose of the experiment is the study of the nucleon spin structure in
collisions of polarized protons and deuterons and other spin-related as well as
unpolarized phenomena at $sqrt{s}$ up to 27 GeV and luminosity up to $10^{32}$
cm$^-2$ s$^-1$.
An overview of the
properties of an effective meson action based on the description of the QCD
vacuum in terms of a mean field corresponding to a statistical ensemble of almost
everywhere homogeneous Abelian (anti-) self-dual gluon fields represented in the
form of domain wall networks is given. Such a mean field ensures the confinement
of static and dynamic quarks and determines the...
The knowledge of the
optimal collision energies at synthesis of the new superheavy elements and of the
contributions of products formed in different reaction channels to the mixed mass
distributions measured in the experiments are of the interest of experimenters. The
dinuclear system (DNS) model \cite{} developed in cooperation between
researchers of the Joint Institute for Nuclear...
Accurate estimates of (anti)neutrino spectra and luminosities are
essential for assessing the feasibility of detecting neutrinos from pre-supernova
stars. Using a recently proposed thermal quasiparticle random-phase
approximation (TQRPA) method, we investigated the effects of nuclear
temperature on pre-supernova (anti)neutrino emission. By comparing the $\nu_e$
and $\bar\nu_e$ spectra...
Understanding the polarization of final-state leptons in neutrino–nucleus
interactions plays a significant role in probing fundamental symmetries. We present
an implementation of final-state lepton polarization within the GENIE neutrino
event generator, focusing on charged-current quasielastic (CCQE) and
two-particle–two-hole (2p2h) scattering processes. The polarization vector of...
When two massive nuclei collide, the reaction leads to the capture of the
heavy-ion projectile into the heavy target nucleus and forms a dinuclear system
after the collision. The system goes through a large-scale collective rearrangement
of the nucleonic matter and develops into an equilibrated compound nucleus (CN),
known as the complete fusion process. However, if the dinuclear system...
Present
work provides a review about experiments carried out with separators GRAND
[1-2] and SHELS [3-4]. The latter is a modernization of the kinematical electrostatic
separator VASSILISSA [5–6]. GRAND is a new gas-filled separator designed to
operate with high-intensity beams delivered by the cyclotron DC-280. It was
constructed within the framework of the SHE Factory project [7] in...
The Spin Physics Detector (SPD) at the Nuclotron based Ion Col- lider
fAcility (NICA) is designed to study nucleon spin structure in the three dimensions.
With capabilities to collide polarized protons (up to √s = 27 GeV) and deuterons
(up to √s = 13.5 GeV) with peak design luminosity 10^{32} cm^{−2} s^{−1} for
protons (an order of magnitude less for deuterons), the experiment will...
This study examines the impact of dark matter (DM) on the bulk
properties of neutron stars (NS) using the relativistic mean field (RMF) theoretical
framework. The analysis considers the neutralino with a mass of 200 GeV, as the
DM candidate. This particle interacts with baryons via the standard Higgs boson.
The investigation focuses on how variations in the dark matter Fermi...
Nowadays applying of multinucleon transfer reactions (MNT) in heavy
nuclei collisions is supposed as a promising approach to produce new heavy and
superheavy nuclei, especially neutron-rich nuclei. The investigation of their
properties is very important for understanding of nucleosynthesis processes. To
reach the «island of stability» the use of heavy systems such as 238U + 238U and
238U...
We analyse the binding energy and charge distribution radius for the
latest superheavy nuclei synthesized in various laboratories, with atomic numbers
$Z=110-118$. For this calculation we use extended Thomas-Fermi approximation
within the relativistic mean field framework. The binding energy and radii are
compared with the results obtained from relativistic Hartree calculations along...
The Multi-Purpose Detector (MPD) experiment at the NICA facility
(JINR, Dubna) will explore the high net-baryon density region of the QCD phase
diagram. Scheduled to begin operation in 2026, it will conduct heavy-ion collisions
at energies of √sNN = 4-11 GeV (collider mode) and √sNN = 2.4-3.5 GeV
(fixed-target mode). Dilepton measurements provide insights into the initial
temperature and...
Exotic nuclei are typically produced via projectile fragmentation or
projectile fission at relativistic energies, or through complete fusion reactions at
near-Coulomb barrier energies. These production methods, along with the
available beam intensities, define the current boundaries of the chart of nuclides.
However, theoretical predictions suggest that several thousand additional...
This talk will have two parts. In the first part we will provide a brief overview of the nuclear physics research at TIFR. In the second part we will go little deeper in some of the topics, drawing primarily from the activities of the speaker. Efforts will be made to discuss topics which are of common interests to researcher in TIFR and JINR. Possible scopes of collaborative works will also be...
Inter University Accelerator Centre (IUAC) is an autonomous centre of the University Grants
Commission (UGC), Government of India, providing advanced facilities to the user community for
carrying out accelerator-based research in basic sciences for more than three decades. Experimental
nuclear physics, both nuclear reaction dynamics and nuclear structure, has been a core area of
research...
The BM@N is the first woking experiment on the NICA complex (Dubna,
Russia). In the winter of 2022 – 2023 the BM@N experiment performed its first
physics run with full configuration. Over 500 million events of Xe+CsI interactions
with the beam kinetic energy of 3.8A GeV and about 50 million events with energy
3.0A GeV were collected. Since then, there has been an active phase...
The advent of high-efficiency gamma ray spectrometers with multiple
types of detectors, digital-signal-processing based data acquisition system, and
the realistic possibility of taking a stride in the hitherto unknown territory of nuclear
landscape are driving the low- and medium-energy nuclear physics into the path of
exciting exploration. With this in consideration, a novel facility,...
In this work, we present the first investigation of dark matter-admixed
quarkyonic stars (DAQSs) using a two-fluid framework. The visible sector of the
star is described through a quarkyonic equation of state (EOS) based on the
Effective Relativistic Mean Field (E-RMF) model, while the DM component is
modeled as a degenerate fermionic gas with scalar and vector self-interaction
terms. Our...
The three-flavour framework of neutrino oscillations successfully
explains most experimental results; however, persistent anomalies at both short-
and long-baseline experiments hint at the existence of additional light sterile states.
In particular, eV-scale sterile neutrinos are motivated by LSND and MiniBooNE
results, while sub-eV sterile states have been proposed to address the...
Quantum chromodynamics (QCD) possesses infinitely many degenerate
vacua distinguished by winding numbers with transitions mediated by topological
gauge fields that flip helicities of quark. This induces local P and CP violation and
generates a chirality imbalance, described by a chiral chemical potential. We will
study collective oscillations of partonic degrees of freedom in such a system...
An experimental study to elucidate the fusion fission dynamics from a
series of nuclear reactions with 40Ar beam at near barrier energies have been
carried out at the K500 cyclotron at VECC, Kolkata. The role of the deformed 40Ar
projectile on a series of targets of 206Pb and 208Pb was examined in this study.
The main motivation was to study the competition between quasi-fission and...
The Hoyle state (Ex = 7.654 MeV, Jπ = 0+) in 12C plays a central role in
stellar nucleosynthesis, serving as the resonant gateway for carbon formation
through the triple-alpha process. Despite its well-established sequential decay via
the ground state of 8Be, the rare possibility of direct three-alpha (DD) decay
remains a key probe of its underlying alpha-cluster. In this work, we explore...
In relativistic heavy-ion collisions, Lorentz contracted pancake-shaped nuclear overlapped region evolves into a rapidly expanding approximately spherically shaped fireball. This shape change, though not topological in nature, influences the expansion dynamics, temperature evolution and lifetime of the medium. These, in turn, affect the rate of QCD topological transitions.
In this work, we...
Measurement of electron beam polarization is a cornerstone for
experiments probing hadronic structure and searching for Physics beyond
standard model. Compton polarimetry, based on Compton scattering between
polarized electrons and polarized photons offer non invasive, continuous
monitoring suited for high current, long duration experiments at
facilities like the Thomas Jefferson National...
This is important to study QCD phase diagram using ultra relativistic
heavy ion collisions. The medium created in such a collision is often of dimensions
a few fermi. An understanding of the effect of the finite volume and the boundary is
important for connecting the experimental results to the phase diagram. Using the
Nambu Jona-Lasinio model, an effective theory for the chiral transition...
Unlike the other reaction mechanisms, nuclear fission process leads to
the production of a large number of fission fragment nuclei. As a result, very
complicated in-beam gamma ray spectra are obtained from the experiment based
on fission fragment spectroscopic measurement. Hence, a very careful and
thorough analysis procedure is to be adopted for extracting different features
related to...
The study of nuclear reactions across different energy domains provides
valuable insights into nuclear structure, dynamics, and the equation of state of
nuclear matter. At low energies, reactions are dominated by mean-field effects,
whereas at very high energies, nucleon–nucleon collisions can produce
quark–gluon plasma. In the intermediate energy regime (20 MeV/nucleon to 2
GeV/nucleon),...
