3,629 research outputs found
Screening and finite size corrections to the octupole and Schiff moments
Parity (P) and time reversal (T) violating nuclear forces create P, T -odd
moments in expansion of the nuclear electrostatic potential. We derive
expression for the nuclear electric octupole field which includes the electron
screening correction (similar to the screening term in the Schiff moment). Then
we calculate the Z alpha corrections to the Schiff moment which appear due to
the finite nuclear size. Such corrections are important in heavy atoms with
nuclear charge Z > 50. The Schiff and octupole moments induce atomic electric
dipole moments (EDM) and P, T -odd interactions in molecules which are measured
in numerous experiments to test CP-violation theories
Enhancement of the electric dipole moment of the electron in the YbF molecule
We calculate an effective electric field on the unpaired electron in the YbF
molecule. This field determines sensitivity of the molecular experiment to the
electric dipole moment of the electron. We use experimental value of the
spin-doubling constant to estimate the admixture of the configuration with the
hole in the 4f-shell of Ytterbium to the ground state of the molecule. This
admixture reduces the field by 7%. Our value for the effictive field is 5.1
a.u. = 2.5 10^{10} V/cm.Comment: 5 pages, LATEX, uses revtex.st
Enhancement of the electric dipole moment of the electron in PbO
The a(1) state of PbO can be used to measure the electric dipole moment of
the electron d_e. We discuss a semiempirical model for this state, which yields
an estimate of the effective electric field on the valence electrons in PbO.
Our final result is an upper limit on the measurable energy shift, which is
significantly larger than was anticipated earlier: .Comment: 4 pages, revtex4, no figures, submitted to PR
Highly charged ions: optical clocks and applications in fundamental physics
Recent developments in frequency metrology and optical clocks have been based
on electronic transitions in atoms and singly charged ions as references. These
systems have enabled relative frequency uncertainties at a level of a few parts
in . This accomplishment not only allows for extremely accurate time
and frequency measurements, but also to probe our understanding of fundamental
physics, such as variation of fundamental constants, violation of the local
Lorentz invariance, and forces beyond the Standard Model of Physics. In
addition, novel clocks are driving the development of sophisticated technical
applications. Crucial for applications of clocks in fundamental physics are a
high sensitivity to effects beyond the Standard Model and Einstein's Theory of
Relativity and a small frequency uncertainty of the clock. Highly charged ions
offer both. They have been proposed as highly accurate clocks, since they
possess optical transitions which can be extremely narrow and less sensitive to
external perturbations compared to current atomic clock species. The selection
of highly charged ions in different charge states offers narrow transitions
that are among the most sensitive ones for a change in the fine-structure
constant and the electron-to-proton mass ratio, as well as other new physics
effects. Recent advances in trapping and sympathetic cooling of highly charged
ions will in the future enable high accuracy optical spectroscopy. Progress in
calculating the properties of selected highly charged ions has allowed the
evaluation of systematic shifts and the prediction of the sensitivity to the
"new physics" effects. This article reviews the current status of theory and
experiment in the field.Comment: 53 pages, 16 figures, submitted to RM
Systematic limits on sin^2{2theta_{13}} in neutrino oscillation experiments with multi-reactors
Sensitivities to sin^2{2theta_{13}} without statistical errors (``systematic
limit'') are investigated in neutrino oscillation experiments with multiple
reactors. Using an analytical approach, we show that the systematic limit on
sin^2{2theta_{13}} is dominated by the uncorrelated systematic error sigma_u of
the detector. Even in an experiment with multi-detectors and multi-reactors, it
turns out that most of the systematic errors including the one due to the
nature of multiple sources is canceled as in the case with a single reactor
plus two detectors, if the near detectors are placed suitably. The case of the
KASKA plan (7 reactors and 3 detectors) is investigated in detail, and it is
explicitly shown that it does not suffer from the extra uncertainty due to
multiple reactors.Comment: 26 pages, 10 eps-files, revtex
The Bose-Einstein correlation function from a Quantum Field Theory point of view
We show that a recently proposed derivation of Bose-Einstein correlations
(BEC) by means of a specific version of thermal Quantum Field Theory (QFT),
supplemented by operator-field evolution of the Langevin type, allows for a
deeper understanding of the possible coherent behaviour of the emitting source
and a clear identification of the origin of the observed shape of the BEC
function . Previous conjectures in this matter obtained by other
approaches are confirmed and have received complementary explanation.Comment: Some misprints corrected. To be publishe in Phys. Rev.
THE ROLE OF INFORMATION TECHNOLOGIES IN THE PROCESS OF PROFESSIONAL TRAINING OF CADETS OF NATIONAL GUARD TROOPS OF THE RUSSIAN FEDERATION
The purpose of this article is to identify the role of information technology in daily process of training of cadets of military schools of national guard troops of theRussian Federation.Methods. The methods involve system-oriented analysis, generalization and modelling.Results and scientific novelty. Informatization of modern society is characterized by growing use of information resources for different spheres of professional activity, suggesting radical changes in the content and technologies of its organization. The problems of informatization of the Russian higher military school are revealed: absence of the uniform methodology for implementation of new information technologies in educational process; low level of cooperation and coordination of activities of educational institutions during creation of a uniform basis of the software; insufficient training of the faculty, etc. The informatization process of military service and military experts of national guard troops of theRussian Federation as members of the security institute in the structure of the state is primarily associated with the creation and maintenance of necessary level of the equipment in order to solve professional tasks in various conditions of the operational environment. Modern realias dictate the need of search of ways and means of improvement of information literacy of cadets of departmental higher education institutions of national guard troops of theRussian Federation. The author of article has designated the main directions of intensive informatization of education of future army officers. The system use of a complex of information technologies of the general and special purpose in educational process of military higher education institution is described. The options of integration of these technologies in the contents of training sections of military experts are shown. Special attention is paid to opportunities of distance learning.Practical significance. The materials of the publication can be used for optimization of educational process of educational institutions of national guard troops of theRussian Federation and other law enforcement agencies, as well as in the system of vocational training of military specialists.Цель статьи – показать возможности информационных технологий для профессиональной подготовки курсантов военных вузов войск национальной гвардии Российской Федерации (ВНГ РФ). Методы, использованные в работе, – системный анализ, обобщение, моделирование. Результаты и научная новизна. Нарастающая прогрессирующими темпами информатизация всех сфер деятельности требует радикальных мер по изменению содержания и организации профессионального образования, в том числе образования военных. Выявлены проблемы информатизации российской высшей военной школы, в частности: отсутствие единой методологии для внедрения новых информационных технологий в учебный процесс; низкий уровень кооперации и координации деятельности образовательных учреждений при создании единой базы программного обеспечения; недостаточная подготовка профессорско-преподавательского состава и др. Процесс информатизации служебно-боевой деятельности специалистов ВНГ РФ как представителей силового института в структуре государства связан, в первую очередь, с обеспечением необходимого уровня технического оснащения с целью качественного решения профессиональных задач в условиях оперативной обстановки. Современные реалии диктуют необходимость поиска путей и средств совершенствования информационной грамотности курсантов ведомственных вузов ВНГ РФ. Автором статьи обозначены основные направления интенсивной информатизации образования будущих офицеров. Описано системное использование комплекса информационных технологий общего и специального назначения в учебном процессе военного вуза. Показаны варианты интеграции этих технологий в содержании разделов подготовки военных специалистов. Особое внимание уделено возможностям дистанционного обучения.Практическая значимость. Материалы могут быть использованы для оптимизации учебного процесса образовательных учреждений ВНГ РФ и других силовых ведомств, а также в системе повышения квалификации военных специалистов
Dynamics of cadmium acclumulation in the internal organs of rats after exposure to cadmium chloride and cadmium sulphide nanopartiles of various sizes.
The article presents the results of study of cadmium accumulation in the internal organs of Wistar rats after prolonged intraperitoneal administration of cadmium chloride and cadmium sulphide nanoparticles of 4-6 nm and 9-11 nm in size in a dose of 0.08 mg /kg/day calculated as cadmium. Toxic effects were evaluated after 30 injections (1.5 months), 60 injections (3 months), and 1.5 months after the exposure has been ceased. The results of the study showed that the most intensive accumulation of cadmium was observed in the kidneys and liver of experimental animals, which is due to the peculiarities of the toxicokinetics and the route of administration of cadmium compounds. In the kidneys, spleen and thymus of animals exposed to cadmium sulphide nanoparticles, a greater concentration of cadmium than in the organs of animals exposed to cadmium chloride was found. Cadmium accumulated more intensively in the spleen after exposure to larger nanoparticles, than in the kidneys and thymus. In the liver, heart, aorta and brain significant accumulation was observed after cadmium chloride exposure.
Using Molecules to Measure Nuclear Spin-Dependent Parity Violation
Nuclear spin-dependent parity violation arises from weak interactions between
electrons and nucleons, and from nuclear anapole moments. We outline a method
to measure such effects, using a Stark-interference technique to determine the
mixing between opposite-parity rotational/hyperfine levels of ground-state
molecules. The technique is applicable to nuclei over a wide range of atomic
number, in diatomic species that are theoretically tractable for
interpretation. This should provide data on anapole moments of many nuclei, and
on previously unmeasured neutral weak couplings
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