Search results for "ODN"
showing 10 items of 2772 documents
Transverse Beam Spin Asymmetries at Backward Angles in Elastic Electron-Proton and Quasielastic Electron-Deuteron Scattering
2011
We have measured the beam-normal single-spin asymmetries in elastic scattering of transversely polarized electrons from the proton, and performed the first measurement in quasi-elastic scattering on the deuteron, at backward angles (lab scattering angle of 108 degrees) for Q2 = 0.22 GeV^2/c^2 and 0.63 GeV^2/c^2 at beam energies of 362 MeV and 687 MeV, respectively. The asymmetry arises due to the imaginary part of the interference of the two-photon exchange amplitude with that of single photon exchange. Results for the proton are consistent with a model calculation which includes inelastic intermediate hadronic (piN) states. An estimate of the beam-normal single-spin asymmetry for the scatt…
Dielectron production in proton-proton and proton-lead collisions at √sNN=5.02TeV
2020
The first measurements of dielectron production at midrapidity (|ηe| < 0.8) in proton–proton and proton–lead collisions at √sNN = 5.02 TeV at the LHC are presented. The dielectron cross section is measured with the ALICE detector as a function of the invariant mass mee and the pair transverse momentum pT, ee in the ranges mee < 3.5 GeV/c2 and pT, ee < 8 GeV/c, in both collision systems. In proton–proton collisions, the charm and beauty cross sections are determined at midrapidity from a fit to the data with two different event generators. This complements the existing dielectron measurements performed at √s = 7 and 13 TeV. The slope of the √s dependence of the three measurements is…
Relativistic Energy Density Functional Description of Shape Transition in Superheavy Nuclei
2012
Relativistic energy density functionals (REDF) provide a complete and accurate, global description of nuclear structure phenomena. A modern semi-empirical functional, adjusted to the nuclear matter equation of state and to empirical masses of deformed nuclei, is applied to studies of shapes of superheavy nuclei. The theoretical framework is tested in a comparison of calculated masses, quadrupole deformations, and potential energy barriers to available data on actinide isotopes. Self-consistent mean-field calculations predict a variety of spherical, axial and triaxial shapes of long-lived superheavy nuclei, and their alpha-decay energies and half-lives are compared to data. A microscopic, RE…
Structure of transactinide nuclei with relativistic energy density functionals
2013
A microscopic theoretical framework based on relativistic energy density functionals (REDFs) is applied to studies of shape evolution, excitation spectra, and decay properties of transactinide nuclei. Axially symmetric and triaxial relativistic Hartree-Bogoliubov (RHB) calculations, based on the functional DD-PC1 and with a separable pairing interaction, are performed for the even-even isotopic chains between Fm and Fl. The occurrence of a deformed shell gap at neutron number $N=162$ and its role on the stability of nuclei in the region around $Z=108$ is investigated. A quadrupole collective Hamiltonian, with parameters determined by self-consistent constrained triaxial RHB calculations, is…
Electron Ion Collider: The Next QCD Frontier - Understanding the glue that binds us all
2016
This White Paper presents the science case of an Electron-Ion Collider (EIC), focused on the structure and interactions of gluon-dominated matter, with the intent to articulate it to the broader nuclear science community. It was commissioned by the managements of Brookhaven National Laboratory (BNL) and Thomas Jefferson National Accelerator Facility (JLab) with the objective of presenting a summary of scientific opportunities and goals of the EIC as a follow-up to the 2007 NSAC Long Range plan. This document is a culmination of a community-wide effort in nuclear science following a series of workshops on EIC physics and, in particular, the focused ten-week program on "Gluons and quark sea a…
Beam-normal single spin asymmetry in elastic electron scattering off 28Si and 90Zr
2020
We report on a new measurement of the beam-normal single spin asymmetry $A_{\mathrm{n}}$ in the elastic scattering of 570 MeV transversely polarized electrons off $^{28}$Si and $^{90}$Zr at $Q^{2}=0.04\, \mathrm{GeV}^2/c^2$. The studied kinematics allow for a comprehensive comparison with former results on $^{12}$C. No significant mass dependence of the beam-normal single spin asymmetry is observed in the mass regime from $^{12}$C to $^{90}$Zr.
Nuclear data activities at the n_TOF facility at CERN
2016
International audience; Nuclear data in general, and neutron-induced reaction cross sections in particular, are important for a wide variety of research fields. They play a key role in the safety and criticality assessment of nuclear technology, not only for existing power reactors but also for radiation dosimetry, medical applications, the transmutation of nuclear waste, accelerator-driven systems, fuel cycle investigations and future reactor systems as in Generation IV. Applications of nuclear data are also related to research fields as the study of nuclear level densities and stellar nucleosynthesis. Simulations and calculations of nuclear technology applications largely rely on evaluate…
Wykorzystanie środków unijnych a realizacja założeń nowego modelu wspomagania szkół i nauczycieli na przykładzie Ośrodka Doskonalenia Nauczycieli w K…
2017
Doskonalenie nauczycieli to jeden z kluczowych czynników poprawy jakości edukacji często poddawany ewaluacji. W artykule dokonano charakterystyki wybranych projektów realizowanych z funduszy Unii Europejskiej przez Ośrodek Doskonalenia Nauczycieli w Kaliszu oraz wskazano procesy związane z ich wdrażaniem. Celem badania była ocena zmodernizowanego systemu doskonalenia nauczycieli i próba określenia, jak model ten sprawdza się w rzeczywistości. Przeprowadzona analiza pozwoliła wskazać efekty szkoleń oraz mankamenty dotyczące struktury i funkcjonowania opisywanego systemu. W artykule zamieszczone zostały wyniki badań, wnioski i rekomendacje.
The spanning tree based approach for solving the shortest path problem in social graphs
2016
This thesis is devoted to the shortest path problem in social graphs. Social graphs represent individuals and social relationships between them. As for social networking sites, their users are represented as vertices of the social graph, and the relationship which indicates whether two users are friends in the social networking site are represented as edges of the social graph. Therefore, social graphs are widely investigated by sociologists in order to determine rules and properties of various social processes. Analysis of such social graphs may be used in prediction of results of election, or recommendation systems. Calculation of many social graph metrics requires computation of shortest…
Reliģiskais simbolisms Luīzes Erdrikas romānos
2018
Šī pētījuma autors analizē, kādā veidā tiek izmantoti reliģiskie simboli Luīzes Erdrikas tetraloģijā, kas sastāv no romāniem “Mīlas Medicīna”, “Pēdas”, “Biešu Karaliene” un “Bingo Pils”. Reliģisko simbolismu analizēšana viņas romānos ļaus saprast Amerikas indiāņu sarežģīto identitātes veidošanās procesu Amerikas kolonizācijas apstākļos. Pētījuma mērķis ir analizēt, kādos veidos Erdrika izmanto reliģisko simbolismu minētajā tetraloģijā. Pētījuma metodes ir padziļinātā lasīšana, stāstījuma analīze un salīdzinošā interpretatīvā metode, balstoties uz postkoloniālās, Amerikas Indiāņu, stāstījuma analīzes un kulturvēsturiskā diskursa analīzes metodoloģijām. Šajā pētījumā izmantotās metodoloģijas …