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Strangeness
in Hadronic Matter and Study of Inelastic Reactions
Near
Kinematical Borders
Theme
leaders:
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E.A. Strokovsky
E.S. Kokoulina
D.O. Krivenkov
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Participating
countries and international organizations:
Belarus,
Czech Republic, Japan, Russia, Slovakia, Ukraine.
The
problem under study and the main purpose of the research:
Strangeness
in hadronic matter and study of boundary effects:
Study
of stabilizing effects of strangeness in nuclear matter and
properties of the lightest hypernuclei.
Study
of multi-particle dynamics in the inelastic proton-proton and
proton-nucleus interactions with extremally high multiplicity.
Study
of spectra and yields of soft photons in the deuteron-nucleus and
nucleus-nucleus interactions.
Determination
of hadronization parameters at NICA energy at the SPD facility.
Study
of Short-Range Correlated (SRC) pairs of nucleons.
Activities:
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Name
of the
activity
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Leaders
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Status
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Laboratory
(Subdivision)
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Responsible
from
laboratories
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1.
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Experiment
NIS-GIBS
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E.A.
Strokovsky
J. Lukstins
D.O. Krivenkov
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VBLHEP
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V.D.
Aksinenko, M.H.
Anikina, K.V.
Asadova,
T. Atovullaev,
A. Atovullaeva, A.V. Averyanov, S.N. Bazylev,
A.E. Baskakov,
D.V. Dementiev, A.A. Feschenko, A.A.
Fedyunin, A.I. Filippov,
S.V. Gertsenberger, A.S.
Khvorostukhin, A.M. Korotkova,
Yu.A. Murin, S.
Nepochatykh, O.V. Okhrimenko, S.N. Plyashkevich,
N.G.
Parfenova, M. Patsyuk, P.A. Rukoyatkin, A.V. Salamatin,
A.V.
Shipunov, M.O. Shitenkov, A.D. Sheremetiev, I.V.
Slepnev, V.M.
Slepnev, N.A. Tarasov, A.V. Terleskiy, A.L. Voronin
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DLNP
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B.A.
Popov, V.V. Tereschenko, S.V. Tereschenko
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OCE
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A.N.
Parfenov
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Brief
annotation and scientific rationale:
The
study of properties of the lightest hypernuclei is actual, has
high significance and the Nuclotron beam is suitable place to
investigate these tasks. The study of properties of light
neutron-rich hypernuclei is of great interest, first of all, to
clarify the theory of the intranuclear nucleon-nucleon
interactions: the neutron halo, ΛN
interaction including ΛN
– ΣN
conversion and the spin-dependent ΛN
interaction etc. The special interest to this investigation is
because of absence of reliable data on 6ΛН properties
and theoretical predictions that are strongly depend on model and
controversial. Simultaneously, the lifetimes and production cross
sections of 4ΛН and 3ΛН will
be studied in the same experiment. The and measurement scan be
used as “reference points” to confirm the production
and decay of 6ΛН.
Expected
results upon completion of the activity:
Experimental
conclusion about the existence of the hypernucleus 6ΛН.
New
experimental data on the properties of the lightest hypernuclei
and experimental verification of corresponding theoretical models
for these hypernuclei.
New
experimental data on the drip-line location for loosely bound
light hypernuclei with high neutron excess, necessary for the
development of the theory of neutron-rich hypernuclei and models
of their production in non-central nucleus-nucleus interactions.
New
experimental data on the production of strangeness and vector
mesons (including those, containing strange quarks) by polarized
photons (close to the relevant thresholds).
Expected
results of the activity in the current year:
Data
taking for 6ΛH
search using beam of 7Li
nuclei. Analysis of the first experimental data for the 6ΛH
search and for the measurements of hyperhydrogen isotopes 6ΛH
and 4ΛH lifetimes.
Upgrade
of the HyperNIS magnetic spectrometer (tracking system) by adding
the planes of GEM detectors. These detectors, which have already
been (partially) purchased and are being tested at the HyperNIS
setup by staff, will be integrated into this setup to improve
accuracy of the hypernucleus decay vertex determination.
Preparation of a project for joint experiments with SRC,
integration of detectors, development of a technical design for a
spectrometer with two magnets (installations of a second magnet,
supply of communications, supports for detectors), common data
acquisition systems (design and tests), MC for the optimal
geometry of joint detectors.
Within
the collaboration with Japan: data taking at LEPS/LEPS2 setups on
the production of strangeness and vector mesons (including those,
containing strange quarks) by polarized photons (close to the
relevant thresholds); analysis of data on such reactions, taken
before.
Preparing
the new combined HyperNIS and SRC project.
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VBLHEP
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V.D.
Aksinenko, M.H.
Anikina, T.
Atovullaev, A. Atovullaeva,
A.V. Averyanov, A.A.
Feschenko, S.V. Gertsenberger,
A.M. Korotkova,
S.
Nepochatykh, O.V. Okhrimenko,
N.G. Parfenova, S.N.
Plyashkevich,
P.A. Rukoyatkin, A.V. Salamatin
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DLNP
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V.V.
Tereschenko
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Brief
annotation and scientific rationale:
The
properties of nuclei are defined by interaction of their
constituents: nucleons on the level of lower resolution and
quarks and gluons at high resolution. The relation between
these two descriptions remains a challenge. Short-Range
Correlated (SRC) pairs of nucleons, which are temporary
fluctuations of strongly interacting nucleons at a distance of
around nucleon radius and individual momenta larger than that
of mean-field nucleons, are coupled to both nuclear scales.
Electron scattering experiments have shown the far-reaching
impacts SRCs have on the many-body systems, the nucleon-nucleon
interaction, and nucleon substructure.
Expected
results upon completion of the activity:
The
emphasis for the next SRC experiment planned at the new
HyperNIS location will be refined based on the analysis
results. The main idea of this proposal is to show that the SRC
setup can fit into the HyperNIS setup with minimal distraction.
However, a larger band by the magnetic field is needed to
obtain the required resolution. For that a second magnet needs
to be installed. Another solution is creating a new analyzing
magnet instead of the installed one.
Expected
results of the activity in the current year:
1.
SRC at BM@N data analysis.
2.
Estimation of the momentum resolution of the HyperNIS magnetic
spectrometer in the perspective of solving the problems of the
SRC experiment.
3.
Estimation of the momentum resolution of the HyperNIS magnetic
spectrometer for solving tasks of the SRC experiment.
4. Preparing
the new combined HyperNIS and SRC project instead of
activity.
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3.
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NEMAN
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E.S.
Kokoulina
V.A. Nikitin
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Project
preparation
Data taking
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VBLHEP
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V.P.
Balandin, N. Barlykov, Yu.T. Borzunov, V.B. Dunin, V. Dudin, O.P.
Gavrischuk, V.Yu.
Ivanenko, D.A.
Kirillov, A.V. Konstantinov, R.I.
Kukushkina,
V.V. Popov, I.A.
Rufanov, S.Yu.
Sinelcshikova, M.V. Tokarev, V.A. Zykunov
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BLTP
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Yu.A.
Bystritsky
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Brief
annotation and scientific rationale:
In
high energy physics, events are usually analyzed for which the
deviation from the average multiplicity does not exceed two
average values. Events with a higher multiplicity occur extremely
rarely, so it is difficult to collect large statistics for them,
in addition, there are difficulties in processing them. When
planning any experiment, simulations are performed, but despite
the fact that the number of Monte Carlo generators increases every
year, their predictions deviate significantly in the region of
high multiplicity. Setting their parameters at the given energy
stops working when moving to a higher energy. All this indicates a
significant misunderstanding of the mechanism of multiple
production. The study of events with the production of a large
number of secondary particles will allow a deeper understanding of
strong interactions, including the hadronization stage. In the
region of high multiplicity, a series of collective phenomena with
a quantum nature are predicted, such as the formation of a pion
(Bose-Einstein) condensate, an excess soft photon (less than 50
MeV) yield, Cherenkov radiation of gluons by quarks, and others.
In this region, the longitudinal component of the momentum
approaches the transverse component, reaching it. This indicates
the disappearance of the leading effect, and in the same region,
apparently, the formation of a condensate begins. These and other
collective manifestations in the behavior of secondary particles
can be studied at the future NICA collider in the SPD project,
since it is planned to register events in the absence of any
trigger. This project is aimed at studying the gluon component of
the nucleon. The study of processes with high multiplicity in the
model of gluon dominance developed at JINR will provide additional
knowledge about the gluon component of the nucleon and its
contribution to hadronization.
Expected
results upon completion of the activity:
Preparation
of a physics program for the study of collective phenomena in the
region of high multiplicity in proton and deuterium interactions
at the SPD facility at the NICA collider.
Development
of the gluon dominance model for the collective behavior study of
secondary particles in high multiplicity events at the energies
of the future NICA collider at the SPD facility. Estimates of the
contribution of gluon bremsstrahlung by quarks and gluon fission
as dominant elementary QCD processes in this region. Estimatesof
hadronization parameters for different kinds of hadrons.
Designing
of a stand-alone multichannel spectrometer-calorimeter for
detecting soft photons and using it to measure the polarization
by the SPILER polarimeter at the output of a spin polarization
source (SPI).
Determination
of the critical region of multiplicity, at which the longitudinal
and transverse components of the momentum become the same (the
disappearance of the leading particle) and the establishment of
its connection with the region of the pionic condensate
formation.
Expected
results of the activity in the current year:
Designing
of electronics for reading and controlling silicon
photomultipliers (SiPM) of a stand-alone multichannel
spectrometer-calorimeter for detecting soft photons and using it
to measure the polarization of the SPILER polarimeter at the
output of a spin polarization source (SPI).
Manufacture
of a spectrometer-calorimeter prototype together with colleagues
from Belarus.
The
detailed simulation of the deuteron-deuteron interaction at the
planing beam energy.
Manufacture
of scintillation counters based on vacuum PMTs, and, further, as
a development of the workable concept, based on solid-state PMTs
(SiPM). Reading control and presentation of the received
information will be carried out directly at the source control
panel workstation. Testing
the prototype on the PNPI beam.
Participation
in the development of a physics program at the future SPD
facility with unpolarized and polarized beams of light nuclei and
protons to study the behavior of multiplicity. Simulation of pp
(dd, pd) interactions at energies up to 27 GeV.
Preparation
of a physics program aimed at searching for collective phenomena
in events with a large (exceeding average) multiplicity, in
particular, the pion (Bose-Einstein) condensate discovered at the
U-70 accelerator, excess soft photon yield, Cherenkov radiation
of gluons by quarks, disappearance of the leading particle
effect.
Detailed
study of the parameters of the hadronization stage for charged
and neutral mesons and baryons in the gluon dominance model.
Preparing
the NEMAN project instead of activity.
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Collaboration
Country
or International Organization
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City
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Institute
or laboratory
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Belarus
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Gomel
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GSTU
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Minsk
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IAP
NASB
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IP
NASB
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Czech
Republic
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Prague
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CTU
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CU
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Japan
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Osaka
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RCNP
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Russia
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Chernogolovka
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ISSP
RAS
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Moscow
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“Azimuth-Photonics’
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“FOMOS-MATERIALS”
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NNRU
“MEPhI”
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SINP
MSU
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Moscow,
Zelenograd
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RIMST
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Protvino
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IHEP
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Syktyvkar
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DM
Komi SC UrB RAS
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Slovakia
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Banska
Bistrica
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UMB
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Ukraine
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Kiev
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BITP
NASU
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