409 research outputs found
New Records of Sporormiaceae from the North-Eastern Part of Ukraine
Наведено дані про 11 видів копрофільних аскоміцетів з родини Sporormiaceae, зібраних у 2012-2016 рр. в північно-східних районах України (Сумська область). Відмічено чотири нових для мікобіоти України види – Preussia funiculata (Preuss) Fuckel, Sporormiella heptamera (Auersw.) S.I. Ahmed et Cain, S. kansensis (Griffiths) S.I. Ahmed et Cain, S. muskokensis (Cain) S.I. Ahmed et Cain та S. pulchella (E.C. Hansen) S.I. Ahmed et Cain.11 species of coprophilous ascomycetes from Sporormiaceae are recorded in 2012–2016 in the north-eastern part of Ukraine (Sumy oblast). Preussia funiculata (Preuss) Fuckel, Sporormiella heptamera (Auersw.) S.I. Ahmed et Cain, S. kansensis (Griffiths) S.I. Ahmed et Cain, S. muskokensis (Cain) S.I. Ahmed et Cain and S. pulchella (E.C. Hansen) S.I. Ahmed et Cain are first recorded in Ukraine
Quarkonia production at RHIC
Quarkonia (J/Psi, Psi', Upsilon) production provides a sensitive probe of
gluon distributions and their modification in nuclei; and is a leading probe of
the hot-dense (deconfined) matter created in high-energy collisions of heavy
ions. I will discuss our current understanding of the modification of gluon
distributions in nuclei and other cold-nuclear-matter effects in the context of
recent p-p and p(d)-A quarkonia measurements. Then I will review the latest
results for nucleus-nucleus collisions from RHIC, and together with the
baseline results from d-A and p-p collisions, discuss several alternative
explanations for the observed suppressions and future prospects for
distinguishing these different pictures.Comment: 8 pages including figures, writeup of talk given at Strange Quark
Matter 2006, UCLA 26-31 March, 200
Event Reconstruction in the PHENIX Central Arm Spectrometers
The central arm spectrometers for the PHENIX experiment at the Relativistic
Heavy Ion Collider have been designed for the optimization of particle
identification in relativistic heavy ion collisions. The spectrometers present
a challenging environment for event reconstruction due to a very high track
multiplicity in a complicated, focusing, magnetic field. In order to meet this
challenge, nine distinct detector types are integrated for charged particle
tracking, momentum reconstruction, and particle identification. The techniques
which have been developed for the task of event reconstruction are described.Comment: Accepted for publication in Nucl. Instrum. A. 34 pages, 23 figure
Recommended from our members
Beam Energy and Centrality Dependence of Direct-Photon Emission from Ultrarelativistic Heavy-Ion Collisions.
The PHENIX collaboration presents first measurements of low-momentum (0.41 GeV/c) direct-photon yield dN_{γ}^{dir}/dη is a smooth function of dN_{ch}/dη and can be well described as proportional to (dN_{ch}/dη)^{α} with α≈1.25. This scaling behavior holds for a wide range of beam energies at the Relativistic Heavy Ion Collider and the Large Hadron Collider, for centrality selected samples, as well as for different A+A collision systems. At a given beam energy, the scaling also holds for high p_{T} (>5 GeV/c), but when results from different collision energies are compared, an additional sqrt[s_{NN}]-dependent multiplicative factor is needed to describe the integrated-direct-photon yield
Net Charge Fluctuations in Au + Au Interactions at sqrt(s_NN) = 130 GeV
Data from Au + Au interactions at sqrt(s_NN) = 130 GeV, obtained with the
PHENIX detector at RHIC, are used to investigate local net charge fluctuations
among particles produced near mid-rapidity. According to recent suggestions,
such fluctuations may carry information from the Quark Gluon Plasma. This
analysis shows that the fluctuations are dominated by a stochastic distribution
of particles, but are also sensitive to other effects, like global charge
conservation and resonance decays.Comment: 6 pages, RevTeX 3, 3 figures, 307 authors, submitted to Phys. Rev.
Lett. on 21 March, 2002. Plain text data tables for the points plotted in
figures for this and previous PHENIX publications are (will be made) publicly
available at http://www.phenix.bnl.gov/phenix/WWW/run/phenix/papers.htm
Flow Measurements via Two-particle Azimuthal Correlations in Au + Au Collisions at sqrt(s_NN) = 130 GeV
Two particle azimuthal correlation functions are presented for charged
hadrons produced in Au + Au collisions at RHIC sqrt(s_NN) = 130 GeV. The
measurements permit determination of elliptic flow without event-by-event
estimation of the reaction plane. The extracted elliptic flow values v_2 show
significant sensitivity to both the collision centrality and the transverse
momenta of emitted hadrons, suggesting rapid thermalization and relatively
strong velocity fields. When scaled by the eccentricity of the collision zone,
epsilon, the scaled elliptic flow shows little or no dependence on centrality
for charged hadrons with relatively low p_T. A breakdown of this epsilon
scaling is observed for charged hadrons with p_T > 1.0 GeV/c for the most
central collisions.Comment: 6 pages, RevTeX 3, 4 figures, 307 authors, submitted to Phys. Rev.
Lett. on 11 April 2002. Plain text data tables for the points plotted in
figures for this and previous PHENIX publications are (will be made) publicly
available at http://www.phenix.bnl.gov/phenix/WWW/run/phenix/papers.htm
Centrality Dependence of Charged Particle Multiplicity in Au-Au Collisions at sqrt(s_NN)=130 GeV
We present results for the charged-particle multiplicity distribution at
mid-rapidity in Au - Au collisions at sqrt(s_NN)=130 GeV measured with the
PHENIX detector at RHIC. For the 5% most central collisions we find
. The results,
analyzed as a function of centrality, show a steady rise of the particle
density per participating nucleon with centrality.Comment: 307 authors, 43 institutions, 6 pages, 4 figures, 1 table Minor
changes to figure labels and text to meet PRL requirements. One author added:
M. Hibino of Waseda Universit
- …