Results 1 - 10 of 57011
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[en] Measurements of the photoelectron angular-distribution asymmetry parameter β for Xe 5s photoionization have been performed in the 80--200 eV photon-energy region. The results show a substantial deviation from the nonrelativistic value of β=2 and provide a clear signature of significant relativistic effects in interchannel coupling
[en] Systematic analysis on angular distribution of secondaries of forty-four (proton, neutron and alpha particle)jets, found in two large emulsion stacks of Texas and Brawley flown at high altitude by large balloons, (Nh<=3, 0.2x 10SUP(12)eV<=Ep<=1.5x10sup(13)eV in Texas stack; Nh<=5, 0.6x10sup(12) eV<=Ep<=6.3x10sup(13)eV in Brawley stack)has been performed in terms of eta(theta). To parameterize the experimental angular distributions, a form of function, f(t)=d/dt*(A exp (-asup(2)tsuP(2))*) has been used, where t=eta(theta)-< eta(theta)>. It has been found that there is a fairly good agreement between the observed and the theoretical distributions which were obtained by adjusting the two parameters A and a in the above function. (Author)
[en] We discuss single- and two-photon-induced processes in e+e- annihilations with center-of-mass energy near 10.58 GeV from the BaBar and Belle experiments. In particular, we present experimental results from two-photon physics of γγ → π0π0 and γγ* → π0. We also review the observation of the Two-Virtual-Photon-Annihilation process (e+e- → ρ0ρ0 and e+e- → φρ0) and the observation of e+e- → ρ+ρ-, which should be primarily a one virtual photon process, but whose angular distributions may imply potential interference effects.
[en] An analysis of angular distributions in hadron-nucleon interactions at 200-400 GeV shows that considerable part of events (approximately 20%) have two maximum structure. Comparison such events with multicluster model reveals that this effect is due to production and decay of two or more clusters
[en] The large-scale angular distribution of quasars from a complete sample of extragalactic radio sources is examined at different redshifts. The sample contains 264 quasars which have been found so far among the complete sample of 518 radio sources stronger than 1 Jy at 5 GHz. Of these, 19 quasars have redshift z > 2. Dividing the entire sky into three separate declination zones of equal area, the counts of quasars seem to indicate a deficit of high redshift quasars in the northernmost declination zone. On the other hand, the low-redshift quasars (Z <= 1) appear fairly uniformly distributed. Some possible selection effects that might have led to the apparent anomaly at high redshifts have been discussed and the expected number of high redshift quasars amongst the radio sources in the sample for which redshifts are presently not available have been estimated. (author)
[en] A helicity amplitude analysis for the processes is performed. The joint angular distributions for these processes are obtained, which allows a proper estimation of the detection efficiency using helicity amplitude information. The helicity amplitudes parameters for are also obtained using measured α values for the first time. In addition, the sensitivities of measurements of the helicity amplitudes parameters for these processes are discussed based on the MC simulation.
[en] Two decades ago, it was predicted [Y.S.Kim et al., Phys.Rev.Lett.46, 1326 (1981)] that relativistic effects should alter the dynamics of the photoionization process in the vicinity of Cooper minima. The present experimental and theoretical study of the angular distributions of Xe 4d3/2 and 4d5/2 photoelectrons demonstrates this effect for the first time. The results clearly imply that relativistic effects are likely to be important for intermediate-Z atoms at most energies
[en] Angular and energy distribution of fragments produced in a collision, employed in conjunction with the 'step-model' that means excitation and binary dissociation, are used to determine the binding energy of H3(D3) and HD+2 and also to identify the principal channels in the dissociation processes. (A.C.A.S.)
[pt]As medidas das distribuicoes angulares e de energia dos fragmentos produzidos em uma colisao, utilizadas em forma conjunta com o modelo de etapas, que significa excitacao e dissociacao binaria, tem sido utilizados para determinar a energia de ligacao das moleculas H3(D3)y HD+2 e adicionalmente, tem sido possivel identificar os canais relevantes no processo de dissociacao. (A.C.A.S.)