In this paper we discuss exclusive reactions whose analysis can be used to receive direct indication of diquark existence. We make estimations of diquark scattering process measurement in inelastic ...proton–proton collisions. It was shown that putting special restrictions over kinematics and particles in the final state of the it will be possible to enhance potential diquark contribution to scattering up to 10
. We present qualitative characteristics of process with diquark and ways to distinguish it from quark scattering in model-independent way.
The airborne magnetic data is considered as one of the best methods to delineate the depth to basement layer. The airborne magnetic survey data obtained from the Egyptian Nuclear Materials Authority. ...Data is accurately processed, interpreted. Two-dimensional (2D) modeling was performed by GM-SYS, along one selected profile yielded from RTP map. In addition to that, three-dimensional (3D) Euler Deconvolution method was performed to delineate the depth to basement layer. Euler solutions were applied on RTP Grid by structural indexes 0, 1, 2, and 3 to select the best solution. The sedimentary succession of the study area is created using seismic data and well data. Petroleum system model was established to predict the locations of hydrocarbons within the study area. The results of PetroMod confirmed that the area is very promising for hydrocarbon aggregations, and also new hydrocarbon aggregations have been discovered.
Based on the results of field complex geophysical studies in the northwestern part of the Russian sector of the Barents Sea shelf, as well as on the processing and comprehensive interpretation of new ...and retrospective geophysical materials in the volume of 25 500 linear kilometers and deep well drilling data in the section of the Barents Sea sedimentary cover, regional tectonostratigraphic units were identified between reflecting horizons (RH): (i) a Paleozoic complex (between RH VI(PR?) and RH I
2
(P‒T)); (ii) a Triassic complex (between RH I
2
(P‒T) and RH B(T‒J)); (iii) a Jurassic complex (between RH B(T‒J) and RH C′(J
3
‒K
1
)); and (iv) a Cretaceous‒Cenozoic complex (between RH V′(J
3
‒K
1
) and the Barents Sea floor). According to the structural analysis results, three structural floors were established: the lower structural level, which includes Riphean terrigenous-effusive deposits and Lower Paleozoic‒Lower Permian terrigenous-carbonate deposits; the middle structural level is formed mainly by Upper Devonian‒Lower Permian carbonate deposits; the upper structural level combines Lower and Upper Permian terrigenous deposits and Mesozoic–Cenozoic deposits. This article presents a new tectonic model of the Barents Sea region, including elements of all structural levels with sublevels. In accordance with the tectonic zoning, paleostructural and paleotectonic analyses, the article outlines the main stages of the Barents Sea shelf development: stage of the Late Proterozoic compression and Early–Middle Paleozoic continental rifting (I), a Late Paleozoic stabilization stage (II), an Early Mesozoic tectonogenesis stage (III), a Middle Mesozoic thermal subsidence stage (IV), a Late Jurassic stabilization stage (V), a Cretaceous subsidence stage (VI), and the final stage as a Cenozoic uplift of a large part of the Barents Sea shelf (VII). In the northwestern part of the Russian sector of the Barents Sea shelf, synchronous subsidence of the sedimentary cover basement took place, associated with spreading and formation of the Arctic Ocean.
For experiments with polarized protons and deuterons, the NICA collider is planned to be used in the transparent spin mode, which is provided by two solenoid snakes. The required direction of ...polarization in the SPD detector is set by "spin navigators", which are insertions that rotate the spins at small angles. The polarization outside the SPD detector is determined by arc dipoles and the placement of snake solenoids in the collider. The kinematics of beam polarization is calculated when vertical, longitudinal or radial polarization is set in the SPD detector for different schemes of placement of snake solenoids. The results are relevant to solve the problems of injection and polarimetry for conducting experiments with polarized beams in the spin transparency mode.
We present the combined results on electron-pair production in 158 GeV/n Pb-Au (\(\sqrt{s}\) = 17.2 GeV) collisions taken at the CERN SPS in 1995 and 1996, and give a detailed account of the data ...analysis. The enhancement over the reference of neutral meson decays amounts to a factor of 2.31 \(\pm0.19 (stat.)\pm0.55 (syst.)\pm0.69 (decays)\) for semi-central collisions (28\(\%\)\(\sigma/\sigma_{geo}\)) when yields are integrated over m > 200 MeV/c2 in invariant mass. The measured yield, its stronger-than-linear scaling with \(N_{\rm ch}\), and the dominance of low pair pt strongly suggest an interpretation as thermal radiation from pion annihilation in the hadronic fireball. The shape of the excess centring at \(m\approx\) 500 MeV/c2, however, cannot be described without strong medium modifications of the \(\rho\) meson. The results are put into perspective by comparison to predictions from Brown-Rho scaling governed by chiral symmetry restoration, and from the spectral-function many-body treatment in which the approach to the phase boundary is less explicit.
A scintillator detector of neutrons and nuclear fragments has been designed, manufactured, and tested on a cosmic-ray stand. The scintillation light is collected with the standard photomultiplier ...(PMT) and six silicon photomultipliers (SiPMs) spaced across the scintillator volume to improve positional sensitivity detector position-sensitive. Data on the detector design and the test results are presented.
We studied the 12C(p,2p+n) reaction at beam momenta of 5.9, 8.0, and 9.0 GeV/c. For quasielastic (p,2p) events p(f), the momentum of the knocked-out proton before the reaction, was compared (event by ...event) with p(n), the coincident neutron momentum. For |p(n)|>k(F)=0.220 GeV/c (the Fermi momentum) a strong back-to-back directional correlation between p(f) and p(n) was observed, indicative of short-range n-p correlations. From p(n) and p(f) we constructed the distributions of c.m. and relative motion in the longitudinal direction for correlated pairs. We also determined that 49+/-13% of events with |p(f)|>k(F) had directionally correlated neutrons with |p(n)|>k(F).
Source of polarised deuterons Fimushkin, V V; Belov, A S; Kovalenko, A D ...
The European physical journal. ST, Special topics,
08/2008, Letnik:
162
Journal Article
Recenzirano
The proposed project assumes the development of a universal high-intensity source of polarized deuterons (protons) using a charge-exchange plasma ionizer.
The transparency of carbon for (p,2p) quasielastic events was measured at beam momenta ranging from 5.9 to 14.5 GeV/c at 90 degrees c.m. The four-momentum transfer squared (Q2) ranged from 4.7 to ...12.7 (GeV/c)(2). We present the observed beam momentum dependence of the ratio of the carbon to hydrogen cross sections. We also apply a model for the nuclear momentum distribution of carbon to obtain the nuclear transparency. We find a sharp rise in transparency as the beam momentum is increased to 9 GeV/c and a reduction to approximately the Glauber level at higher energies.
Based on the results of field complex geophysical studies in the northwestern part of the Russian sector of the Barents Sea shelf, as well as on the processing and comprehensive interpretation of new ...and retrospective geophysical materials in the volume of 25 500 linear kilometers and deep well drilling data in the section of the Barents Sea sedimentary cover identified regional tectonostratigraphic units: (i) Paleozoic complex (between reflecting horizons VI(PR? ) and I2(P‒T)); (ii) the Triassic complex (between reflecting horizons I2(P‒T) and B(T‒J)); (iii) the Jurassic complex (between reflecting horizons B(T‒J) and V′(J3‒K1)); (iv) the Cretaceous‒Cenozoic complex (between reflecting V′(J3‒K1) and the Barents sea floor). According to the structural analysis’ results, three structural floors are established: the lower structural floor, which includes Riphean terrigenous-affusive sediments and Lower Paleozoic‒Lower Permian terrigenous-carbonate sediments; the middle structural floor is formed mainly by carbonate sediments of Upper Devonian‒Lower Permian; the upper structural floor combines terrigenous sediments of Lower and Upper Permian, Mesozoic and Cenozoic sediments. The authors present a new tectonic model of the Barents Sea region, including elements of all structural floors with subfloors. In accordance with the tectonic zoning, paleostructural and paleotectonic analyses, the article outlines the main stages of the Barents Sea shelf development: stage of the Late Proterozoic compression and Early-Middle Paleozoic continental rifting (I), Late Paleozoic stabilization stage (II), Early Mesozoic tectogenesis stage (III), Middle Mesozoic thermal subsidence stage (IV), Late Jurassic stabilization stage (V), Cretaceous sagging stage (VI) and the final stage as a Cenozoic uplift over a large part of the Barents Sea shelf (VII). In the northwestern part of the Russian sector of the Barents Sea shelf, synchronous dipping of the sedimentary cover basement took place, associated with spreading and formation of the Arctic Ocean.
PDF
