Antiprotons at Solar Maximum

New measurements with good statistics will make it possible to observe the time variation of cosmic antiprotons at 1 AU through the approaching peak of solar activity. We report a new computation of the interstellar antiproton spectrum expected from collisions between cosmic protons and the interstellar gas. This spectrum is then used as input to a steady-state drift model of solar modulation, in order to provide predictions for the antiproton spectrum as well as the antiproton/proton ratio at 1 AU. Our model predicts a surprisingly large, rapid increase in the antiproton/proton ratio through the next solar maximum, followed by a large excursion in the ratio during the following decade.New measurements with good statistics will make it possible to observe the time variation of cosmic antiprotons at 1 AU through the approaching peak of solar activity. We report a new computation of the interstellar antiproton spectrum expected from collisions between cosmic protons and the interstellar gas. This spectrum is then used as input to a steady-state drift model of solar modulation, in order to provide predictions for the antiproton spectrum as well as the antiproton/proton ratio at 1 AU. Our model predicts a surprisingly large, rapid increase in the antiproton/proton ratio through the next solar maximum, followed by a large excursion in the ratio during the following decade

Nonquasiparticle states in half-metallic ferromagnets

Anomalous magnetic and electronic properties of the half-metallic ferromagnets (HMF) have been discussed. The general conception of the HMF electronic structure which take into account the most important correlation effects from electron-magnon interactions, in particular, the spin-polaron effects, is presented. Special attention is paid to the so called non-quasiparticle (NQP) or incoherent states which are present in the gap near the Fermi level and can give considerable contributions to thermodynamic and transport properties. Prospects of experimental observation of the NQP states in core-level spectroscopy is discussed. Special features of transport properties of the HMF which are connected with the absence of one-magnon spin-flip scattering processes are investigated. The temperature and magnetic field dependences of resistivity in various regimes are calculated. It is shown that the NQP states can give a dominate contribution to the temperature dependence of the impurity-induced resistivity and in the tunnel junction conductivity. First principle calculations of the NQP-states for the prototype half-metallic material NiMnSb within the local-density approximation plus dynamical mean field theory (LDA+DMFT) are presented.Comment: 27 pages, 9 figures, Proceedings of Berlin/Wandlitz workshop 2004; Local-Moment Ferromagnets. Unique Properties for Moder Applications, ed. M. Donath, W.Nolting, Springer, Berlin, 200

Centrality dependence of charged particle production at large transverse momentum in Pb-Pb collisions at sNN=2.76\sqrt{s_{\rm{NN}}} = 2.76 TeV

The inclusive transverse momentum ($p_{\rm T}$) distributions of primary charged particles are measured in the pseudo-rapidity range $|\eta|<0.8$ as a function of event centrality in Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}=2.76$ TeV with ALICE at the LHC. The data are presented in the $p_{\rm T}$ range $0.15<p_{\rm T}<50$ GeV/$c$ for nine centrality intervals from 70-80% to 0-5%. The Pb-Pb spectra are presented in terms of the nuclear modification factor $R_{\rm{AA}}$ using a pp reference spectrum measured at the same collision energy. We observe that the suppression of high-$p_{\rm T}$ particles strongly depends on event centrality. In central collisions (0-5%) the yield is most suppressed with $R_{\rm{AA}}\approx0.13$ at $p_{\rm T}=6$-7 GeV/$c$. Above $p_{\rm T}=7$ GeV/$c$, there is a significant rise in the nuclear modification factor, which reaches $R_{\rm{AA}} \approx0.4$ for $p_{\rm T}>30$ GeV/$c$. In peripheral collisions (70-80%), the suppression is weaker with $R_{\rm{AA}} \approx 0.7$ almost independently of $p_{\rm T}$. The measured nuclear modification factors are compared to other measurements and model calculations.Comment: 17 pages, 4 captioned figures, 2 tables, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/284

Perfil antropométrico e funcional de velejadores da classe "Optimist"

Este estudo apresenta uma análise descritiva das características antropométricas e funcionais de crianças e adolescentes velejadores da classe "Optimist", participantes do campeonato estadual do Rio de Janeiro, em 2006. Foram avaliados 50 velejadores do sexo masculino, sendo 17 da categoria infantil e 33 da juvenil. Os velejadores da categoria infantil apresentaram (valores médios ± desvio padrão) 152,8 ± 5,8 cm de estatura, 45,6 ± 5,5 kg de massa corporal, índice de massa corporal (IMC) de 19,6 ± 2,8 e percentual de gordura de 23,9 ± 7,0%. Quanto às características funcionais, observou-se força de preensão média de 22,5 ± 2,9 kgf e salto vertical com altura de 25,5 ± 4,8 cm. A categoria juvenil apresentou estatura média de 161,7 ± 7,7 cm, massa corporal de 48,9 ± 7,5 kg, IMC de 18,7 ± 2,2 kg/m²; percentual de gordura de 18,6 ± 5,5%, força de preensão de 29,6 ± 5,5 kgf e altura do salto vertical de 31,6 ± 4,7 cm. A categoria juvenil apresentou estatura e força significativamente maiores que a infantil (p This study presents an anthropometric and functional descriptive analysis of young Optimist dinghy sailors, competitors of the Rio de Janeiro State Sailing Championship, in 2006. There were evaluated 50 male sailors, 17 from the infant category and 33 from the junior category. Infant category sailors presented the following descriptive values (mean values ± standard deviation): 152.8 ± 5.8 cm of height, 45.6 ± 5.5 kg of body mass, 19.6 ± 2.8 kg/m² of BMI, and 23.9 ± 7.0% of body fat. Regarding the functional characteristics, handgrip strength was 22.5 ± 2.9 kgf and vertical jump height was 25.5 ± 4.8 cm. Junior category had mean stature of 161.7 ± 7.7 cm, body mass of 48.9 ± 7.5 kg, BMI of 18.7 ± 2.2 kg/m²; fat percentage of 18.6 ± 5.5%, handgrip strength of 29.6 ± 5.5 kgf and mean vertical jump height of 31.6 ± 4.7 cm. Junior category was significant taller and stronger than Infant category (p < 0.05). However, the fat percentage was significant lower, resulting in similar BMI and body mass between categories. The results indicate that Junior sailors have a thinner body profile, higher handgrip strength and height are followed by a reduction of the percentage of body fat and maintenance of body mass within limits that are not harmful to the athlete's performance in Optimist boats