Results 1 - 10 of 37543
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[en] For the first time it is suggested the curve asymmetry index as a quantitative measure of an asymmetry of sunspot group area development curve, which turns out to be very useful parameter, making possible to estimate the numerical values of quantities in the analytic formula of the curve. It is established that area development curves of different groups don't too much differ one form another and have the same character, that, probably, shows the likeness in their displays. (author)
[en] The author presents four physics processes that have measured asymmetries at high energy. Some problems and some advantages of utilizing each in a polarimeter are discussed. For each he gives references to examples of experimental setup and data
[en] Effects of T-odd asymmetry in ternary-nuclear-fission reactions induced by polarized cold neutrons are considered within quantum theory. It is shown that the asymmetry coefficient can be expressed in terms of experimental angular distributions of third particles in reactions induced by unpolarized neutrons. The explicit form of this coefficient makes it possible to explain the difference in the magnitudes and signs of the TRI and ROT effects observed experimentally for different targets.
[en] New data on the tensor analyzing power Ayy of the 9Be(d, p)X reaction at an initial deuteron momentum of 5 GeV/c and a proton detection angle of 178 mrad have been obtained at the JINR Synchrophasotron. The data obtained are analyzed in the framework of an approach based on the light-front dynamics using Karmanov's relativistic deuteron wave function. It has been managed to explain the new data within the framework of our approach without invoking degrees of freedom additional to the nucleon ones, contrary to the calculations using standard nonrelativistic deuteron wave functions
[ru]На синхрофазотроне ОИЯИ получены новые данные о векторной Ay и тензорной Ayy анализирующих способностях реакции 9Be(d, p)X при начальном импульсе дейтронов 5 ГэВ/с и угле испускания протонов 178 мрад. Экспериментальные данные о Ayy анализируются в рамках подхода, основанного на динамике светового фронта, с использованием релятивистской волновой функции дейтрона, полученной В.А. Кармановым с соавт. Показано, что в этом приближении удается объяснить полученные данные без привлечения дополнительных степеней свободы, в отличие от вычислений со стандартными нерелятивистскими волновыми функциями дейтрона
[en] A new algorithm for extraction of asymmetries from polarized lepton-nucleon scattering data is proposed. The algorithm is stable to set-up acceptance and/or luminosity monitor acceptance variations. A statistical test for checking the data quality is proposed
[en] The systematic data on the fission fragment mass distribution for nuclei ranging from Z = 88 to 120 relevant to the r-process nucleosynthesis is constructed in a semi-empirical way. The mass distribution is estimated from the potential energy surface by means of the liquid drop model with the shell energy correction and also by referring the results in the dynamical calculation of fission paths by the Langevin equation in the three-dimensional deformation space. The results are compared with the mass asymmetric values at the saddle point driven by the extended Thomas-Fermi Struchinsky integral (ETFSI) model. In the lighter nuclei Z < 100, our results are consistent with the values of ETFSI, on the other hand in the heavier nuclei our estimation gives a larger mass asymmetry and approaches to zero due to the decrease of shell effect beyond Z > 120. (authors)
[en] An analytical description of Fano line-shape asymmetry ratio has been presented here for a general case. It is shown that Fano line-shape becomes less asymmetric as |q| is increased and finally becomes completely symmetric in the limiting condition of q equal to infinity. Asymmetry ratios of Fano line-shapes have been calculated and are found to be in good consonance with the reported expressions for asymmetry ratio as a function of Fano parameter. Application of this derivation is also mentioned for explanation of asymmetry to symmetry transition of Fano line-shape in quantum confined silicon nanostructures. (author)
[en] We review our works aimed at the creation of a unipolar laser with the efficient suppression of nonradiative relaxation between the laser subbands owing to strongly asymmetric in height barriers surrounding an active element. The asymmetry of the barriers causes the existence of a lower laser subband only within a narrow region of in-plane momenta. In such a way one-phonon relaxation between the laser subbands can be significantly suppressed
[en] We report measurements of branching fractions and time-dependent CP asymmetries in B0 → D+D- and B0 → D*±D#-+# decays using a data sample that contains (772 ± 11) x 106 BB- pairs collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. We determine the branching fractions to be Β(B0 → D+D-) = (2.12 ± 0.16 ± 0.18) x 10-4 and Β(B0 → D*±D#-+#) = (6.14 ± 0.29 ± 0.50) x 10-4. We measure CP asymmetry parameters SD#sup +#D#sup -# = -1.06-0.14+0.21 ± 0.08 and CD#sup +#D#sup -# = -0.43 ± 0.16 ± 0.05 in B0 → D+D- and AD*D = +0.06 ± 0.05 ± 0.02, SD*D = -0.78 ± 0.15 ± 0.05, CD*D = -0.01 ± 0.11 ± 0.04, ΔSD*D = -0.13 ± 0.15 ± 0.04 and ΔCD*D = +0.12 ± 0.11 ± 0.03 in B0 → D*±D#-+#, where the first uncertainty is statistical and the second is systematic. We exclude the conservation of CP symmetry in both decays at equal to or greater than 4σ significance.
[en] We generalize a positivity constraint derived initially for parity-conserving processes to the parity-violating ones, and use it to derive non-trivial bounds on several Sivers functions, entering in the theoretical description of single spin asymmetry for various processes.