Two-pion Bose-Einstein correlations in central Pb-Pb collisions at sNN\sqrt{s_{\rm NN}} = 2.76 TeV

The first measurement of two-pion Bose-Einstein correlations in central Pb-Pb collisions at $\sqrt{s_{\rm NN}} = 2.76$ TeV at the Large Hadron Collider is presented. We observe a growing trend with energy now not only for the longitudinal and the outward but also for the sideward pion source radius. The pion homogeneity volume and the decoupling time are significantly larger than those measured at RHIC.Comment: 17 pages, 5 captioned figures, 1 table, authors from page 12, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/388

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

Inclusive transverse momentum spectra of primary charged particles in Pb-Pb collisions at $\sqrt{s_{_{\rm NN}}}$ = 2.76 TeV have been measured by the ALICE Collaboration at the LHC. The data are presented for central and peripheral collisions, corresponding to 0-5% and 70-80% of the hadronic Pb-Pb cross section. The measured charged particle spectra in $|\eta|<0.8$ and $0.3 < p_T < 20$ GeV/$c$ are compared to the expectation in pp collisions at the same $\sqrt{s_{\rm NN}}$, scaled by the number of underlying nucleon-nucleon collisions. The comparison is expressed in terms of the nuclear modification factor $R_{\rm AA}$. The result indicates only weak medium effects ($R_{\rm AA} \approx$ 0.7) in peripheral collisions. In central collisions, $R_{\rm AA}$ reaches a minimum of about 0.14 at $p_{\rm T}=6$-7GeV/$c$ and increases significantly at larger $p_{\rm T}$. The measured suppression of high-$p_{\rm T}$ particles is stronger than that observed at lower collision energies, indicating that a very dense medium is formed in central Pb-Pb collisions at the LHC.Comment: 15 pages, 5 captioned figures, 3 tables, authors from page 10, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/98

Effective Rheology of Bubbles Moving in a Capillary Tube

We calculate the average volumetric flux versus pressure drop of bubbles moving in a single capillary tube with varying diameter, finding a square-root relation from mapping the flow equations onto that of a driven overdamped pendulum. The calculation is based on a derivation of the equation of motion of a bubble train from considering the capillary forces and the entropy production associated with the viscous flow. We also calculate the configurational probability of the positions of the bubbles.Comment: 4 pages, 1 figur

Alignment of the ALICE Inner Tracking System with cosmic-ray tracks

37 pages, 15 figures, revised version, accepted by JINSTALICE (A Large Ion Collider Experiment) is the LHC (Large Hadron Collider) experiment devoted to investigating the strongly interacting matter created in nucleus-nucleus collisions at the LHC energies. The ALICE ITS, Inner Tracking System, consists of six cylindrical layers of silicon detectors with three different technologies; in the outward direction: two layers of pixel detectors, two layers each of drift, and strip detectors. The number of parameters to be determined in the spatial alignment of the 2198 sensor modules of the ITS is about 13,000. The target alignment precision is well below 10 micron in some cases (pixels). The sources of alignment information include survey measurements, and the reconstructed tracks from cosmic rays and from proton-proton collisions. The main track-based alignment method uses the Millepede global approach. An iterative local method was developed and used as well. We present the results obtained for the ITS alignment using about 10^5 charged tracks from cosmic rays that have been collected during summer 2008, with the ALICE solenoidal magnet switched off.Peer reviewe

A geometric study of Sieradski groups

This paper is devoted to the study of orientable closed 3-manifolds uniformized by cyclically presented groups, introduced by Sieradski in Invent. Math. 84 (1986) and by certain generalizations of them. It is shown that these manifolds are cyclic coverings of the 3-sphere branched over torus knots. This answers in the affirmative an open question suggested by the referee of the quoted paper and recovers the main theorem of a paper of R. Thomas published in Bull. Korean Math. Soc. 28 (1991)

Experiences of families with children and adolescents after completing a cancer treatment: support for the nursing care Experiencias de familiares con niños y adolescentes, posteriores al término del tratamiento de cáncer: subsidios para el cuidado de enfermería Experiências de familiares de crianças e adolescentes, após o término do tratamento contra câncer: subsídios para o cuidado de enfermagem

The survival of children and adolescents with cancer has increased in recent years. Researchers and professionals in the health area have prioritized studies on the delayed effects of the treatment and quality of life of the survivors. This study aims to understand how parents and other family members of children and adolescents with cancer, experience the completion of the treatment. This descriptive and exploratory study adopted a qualitative methodological approach. A total of ten families whose children had completed the cancer treatment and were in follow-up in a hospital-school were selected for the study. The data were organized in two thematic axes: the memory % what was experienced and the present % what is being experienced. The study evidenced the participants' vitality to survive the treatment and fragility to live after it. The results allowed identifying aspects that need intervention, aiming at the improvement of quality of life of children, adolescents and the whole family after the end of the treatment.<br>La sobrevivencia de niños y adolescentes con cáncer viene aumentando en los últimos años. Investigadores y profesionales del área de la salud han establecido como prioridad, estudios sobre los efectos tardíos del tratamiento y la calidad de vida de los pacientes. El objetivo de este estudio es comprender como las familias de niños y adolescentes con cáncer vivencian el término del tratamiento. El estudio es de naturaleza descriptivo- exploratoria con análisis cualitativo de los datos. Participaron diez familias de niños y adolescentes en la etapa final de su tratamiento seguido dentro de un hospital-escuela. Los resultados fueron organizados en dos ejes temáticos: la memoria- lo que fue vivido y el presente- lo que se vive. Con este estudio, se evidenció la vitalidad de los participantes para terminar el tratamiento y la fragilidad de vivir posterior al mismo. Los resultados permiten identificar aspectos que requieren de intervención, teniendo como objetivo una mejor calidad de vida para los niños, adolescentes y para su familia, posterior al tratamiento.<br>A sobrevida de crianças e adolescentes com câncer tem aumentado nos últimos anos. Pesquisadores e profissionais da área de saúde têm estabelecido como prioridade estudos sobre os efeitos tardios do tratamento e qualidade de vida dos sobreviventes. O objetivo deste estudo é compreender como as famílias de crianças e adolescentes com câncer vivenciam a experiência do término do tratamento. O estudo é de natureza descritivo-exploratória com análise qualitativa dos dados. Participaram dez famílias de crianças e adolescentes na fase de término do tratamento que estavam em acompanhamento em um hospital-escola. Os dados foram organizados em dois eixos temáticos: a memória - o que foi vivido e o presente - o que se vive. Com esse estudo, evidenciou-se a vitalidade dos participantes de sobreviver ao tratamento e a tenuidade de viver após ele. Os resultados possibilitaram identificar aspectos que necessitam de intervenção, objetivando a melhoria da qualidade de vida de crianças, adolescentes e da própria família, após o término do tratamento