6,803 research outputs found
On the asymmetry of Gamow-Teller beta-decay rates in mirror nuclei in relation with second-class currents
The theoretical evaluation of major nuclear structure effects on the
asymmetry of allowed Gamow-Teller beta-decay rates in light mirror nuclei is
presented. The calculations are performed within the shell model, using
empirical isospin-nonconserving interaction and realistic Woods-Saxon radial
wave functions. The revised treatment of p-shell nuclei is supplemented by
systematic calculations for sd-shell nuclei and compared to experimental
asymmetries when available. The results are important in connection with the
possible existence of second-class currents in the weak interaction.Comment: 16 pages, 6 figure
M. О. Gershenzon on Pushkin's"Immanent Philosophy" and "Thermodynamic Psychology". Metaphor and Non-Metaphorical Meaning
The article is devoted to the interpretation of Pushkin's "immanent philosophy" and "thermodynamic psychology" by M. O. Gershenzon.Статья посвящена прочтению М. О. Гершензоном "имманентной философии" и "термодинамической психологии" в творчестве А. С. Пушкина
Correlations, Risk and Crisis: From Physiology to Finance
We study the dynamics of correlation and variance in systems under the load
of environmental factors. A universal effect in ensembles of similar systems
under the load of similar factors is described: in crisis, typically, even
before obvious symptoms of crisis appear, correlation increases, and, at the
same time, variance (and volatility) increases too. This effect is supported by
many experiments and observations of groups of humans, mice, trees, grassy
plants, and on financial time series.
A general approach to the explanation of the effect through dynamics of
individual adaptation of similar non-interactive individuals to a similar
system of external factors is developed. Qualitatively, this approach follows
Selye's idea about adaptation energy.Comment: 42 pages, 15 figures, misprints corrections, a proof is added,
improved journal versio
The effect of the relative nuclear size on the nucleus-nucleus interactions
The experimental data on the interactions of light nuclei (d, He(4), C(12)) at the momentum 4.2 GeV/cA with the carbon nuclei were taken in the 2-m propane bubble chamber. The distributions in the number of interacting nucleons, the spectra of protons, the mean energies of secondary pions and protons, the mean fractions of energy transferred to the pion and nucleon components are presented. The results of the investigation of the mechanism of nucleus-nucleus interactions can be used to calculate the nuclear cascades in the atmosphere
Explanation of the Normal Winter Anomaly from the Seasonal Variation of Short Wave Absorption
The frequency dependence of the winter anomaly (WA) of radio wave absorption indicates the altitude range where the considered seasonal variation of absorption, L, takes place: 75-95 km. In this height region considerable seasonal variations of ionic composition and effective recombination coefficient, alpha sub e, exist, which can cause seasonal variations of electron concentration, N, and absorption, L. An attempt to render a qualitative estimation of the normal WA, i.e., the increased ratio of winter over summer absorption, L sub w/L sub s, at medium latitudes 40 deg and 50 deg, for solar zenith angles CHi = 60 deg and 75 deg is made. This is compared with existing experimental data
- …