Estimated counting rate in the collisions of heavy ions in the NICA/MPD are presented for collisions of main bunches (bunch-bunch scattering), satellite bunches (satellite-satellite scattering), and ...the collision of a main bunch with a satellite bunch (bunch-satellite scattering). The distribution of vertices in the MPD interaction area is presented. The main conclusion is that the contributions of satellite-satellite and satellite-bunch scattering do not exceed two percent of the bunch-bunch scattering.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
—
A new time-of-flight (ToF) system of the NA61/SHINE hadron spectrometer at the extracted beam of the Super Hadron Synchrotron in CERN has been developed in 2019–2022 by the staff of the Laboratory ...of High-Energy Physics of the Joint Institute for Nuclear Research. The new ToF system is based on Multigap Resistive Plate Chambers (MRPCs) technology. The previous system consisting of scintillation counters was substituted with the new ToF system. This paper presents the overview of the new NA61/SHINE ToF system.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Electromagnetic calorimeter (ECal) is an important detector of the Multi-Purpose Detector (MPD) at the Nuclotron-based Ion Collider fAcility (NICA) at the Joint Institute for Nuclear Research (JINR), ...Dubna. In that experiment, the main goal of the MPD ECal (which was selected to be a shashlyk-type electromagnetic calorimeter) is to identify electrons, photons and measure their energies with high precision. This paper introduces the tests of the IHEP-produced ECal module prototypes using muons from the accelerator U-70 (IHEP, Protvino, Russia). Those tests demonstrated the capability to collect 700 photoelectrons per MIP particle. To optimize its performance, a deep-learning-based algorithm is used to perform the energy reconstruction of the ECal module prototypes made by Tsinghua University (China) using the data from a beam test in DESY. For the 4.0 GeV electron beam, an energy resolution better than 3.8% can be achieved. This improves the energy characteristics of ECal compared to the more traditional reconstruction methods applied in the calorimetr.
The Multi-Purpose Detector (MPD) is designed to study a hot and dense baryonic matter formed in heavy-ion collisions at sNN=4–11 GeV at the NICA accelerator complex (Dubna, Russia). A large-sized ...electromagnetic calorimeter (ECal) of the MPD spectrometer will provide precise spatial and energy measurements for photons and electrons in the central pseudorapidity region of |η| < 1.2. The Shashlyk-type sampling structure of the ECal is optimized for the photons energy range from about 40 MeV to 2–3 GeV . Fine segmentation and projective geometry of the calorimeter allow dealing with a high multiplicity of secondary particles from Au-Au reactions. In this paper, we report on a design, a construction status and expected parameters of the ECal.
The NA61/SHINE experiment at the CERN Super Proton Synchrotron (SPS) studies the onset of deconfinement in hadron matter by a scan of particle production in collisions of nuclei with various sizes at ...a set of energies covering the SPS energy range. This paper presents results on inclusive double-differential spectra, transverse momentum and rapidity distributions and mean multiplicities of
π
±
,
K
±
,
p
and
p
¯
produced in the 20% most
central
7
Be+
9
Be collisions at beam momenta of 19
A
, 30
A
, 40
A
, 75
A
and 150
A
Ge
V
/
c
. The energy dependence of the
K
±
/
π
±
ratios as well as of inverse slope parameters of the
K
±
transverse mass distributions are close to those found in inelastic
p+p
reactions. The new results are compared to the world data on
p+p
and Pb+Pb collisions as well as to predictions of the
Epos
,
U
r
qmd
,
Ampt
,
Phsd
and
Smash
models.
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The results of studies on the distribution of macrozoobenthic taxa along the water mineralization gradient in the small salt rivers of the Lake Elton basin are presented. The optimum and tolerance ...intervals for dominant species have been determined. Species with the highest tolerance to the high-salinity aquatic environment have been identified.
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EMUNI, FIS, FZAB, GEOZS, GIS, IJS, IMTLJ, KILJ, KISLJ, MFDPS, NLZOH, NUK, OILJ, PNG, SAZU, SBCE, SBJE, SBMB, SBNM, UKNU, UL, UM, UPUK, VKSCE, ZAGLJ
Results on $\phi $ meson production in inelastic $p + p$ collisions at CERN SPS energies are presented. They are derived from data collected by the NA61/SHINE fixed target experiment, by means of ...invariant mass spectra fits in the $\phi \rightarrow K^+ K^- $ decay channel. They include the first ever measured double differential spectra of $\phi $ mesons as a function of rapidity $y$ and transverse momentum $p_{\text {T}}$ for proton beam momenta of $80 \, \hbox {GeV}/c$ and $158 \, \hbox {GeV}/c$, as well as single differential spectra of $y$ or $p_{\text {T}}$ for beam momentum of $40 \, \hbox {GeV}/c$. The corresponding total $\phi $ yields per inelastic $p + p$ event are obtained. These results are compared with existing data on $\phi $ meson production in $p + p$ collisions. The comparison shows consistency but superior accuracy of the present measurements. The emission of $\phi $ mesons in $p + p$ reactions is confronted with that occurring in $\mathrm{Pb} + \mathrm{Pb}$ collisions, and the experimental results are compared with model predictions. It appears that none of the considered models can properly describe all the experimental observations.
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The project NICA (Nuclotron-based Ion Collider fAcility) is aimed to study hot and dense baryonic matter in heavy ion collisions in the energy range up to √sNN=11 GeV at the Nuclotron extracted beams ...and at the NICA collider with average luminosity of L = 1027 cm-2s-1 (for 197Au79). This study will be performed with two experiments, BM@N (Baryonic Matter at Nuclotron) and MPD (MultiPurpose Detector) at the NICA collider.
Cold nuclear fusion Tsyganov, E.N.; Bavizhev, M.D.; Buryakov, M.G. ...
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms,
07/2015, Volume:
355
Journal Article
Peer reviewed
If target deuterium atoms were implanted in a metal crystal in accelerator experiments, a sharp increase in the probability of DD-fusion reaction was clearly observed when compared with the ...reaction’s theoretical value. The electronic screening potential, which for a collision of free deuterium atoms is about 27eV, reached 300–700eV in the case of the DD-fusion in metallic crystals. These data leads to the conclusion that a ban must exist for deuterium atoms to be in the ground state 1s in a niche filled with free conduction electrons. At the same time, the state 2p whose energy level is only 10eV above that of state 1s is allowed in these conditions. With anisotropy of 2p, 3p or above orbitals, their spatial positions are strictly determined in the lattice coordinate system. When filling out the same potential niches with two deuterium atoms in the states 2p, 3p or higher, the nuclei of these atoms can be permanently positioned without creating much Coulomb repulsion at a very short distance from each other. In this case, the transparency of the potential barrier increases dramatically compared to the ground state 1s for these atoms. The probability of the deuterium nuclei penetrating the Coulomb barrier by zero quantum vibration of the DD-system also increases dramatically. The so-called cold nuclear DD-fusion for a number of years was registered in many experiments, however, was still rejected by mainstream science for allegedly having no consistent scientific explanation. Finally, it received the validation. Below, we outline the concept of this explanation and give the necessary calculations. This paper also considers the further destiny of the formed intermediate state of 4He∗.
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GEOZS, IJS, IMTLJ, KILJ, KISLJ, NUK, OILJ, PNG, SAZU, SBCE, SBJE, UL, UM, UPCLJ, UPUK
20.
A real-size MRPC developed for CBM-TOF Zhu, WeiPing; Wang, Yi; Feng, ShengQin ...
Science China. Technological sciences,
11/2013, Volume:
56, Issue:
11
Journal Article
Peer reviewed
An MRPC prototype for the future CBM-TOF inner area has been developed. The counter assembled with low resistive glass consists of 10×0.22 mm gas gaps and 2×8 readout pads. The size of each pad is 20 ...mm×20 mm with an interval of 2 mm between pads. The signals of the counter are collected by 4 eight-pin connectors. Preliminary tests performed with cosmic-rays showed an efficiency over 98% and a time resolution around 60 ps. The measured crosstalk, dark current and dark rate were at a very low levels. Results under uniform irradiation performed at JINR with high energy deuteron showed a time resolution of 40-50 ps and over 98% efficiency at a low flux rate, meanwhile at a flux up to 70 kHz/cm2, 93% efficiency and 77 ps time resolution still remained. These excellent performances call fully meet the demand of CBM-TOF inner wall.
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