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N. Abgrall,
A. Aduszkiewicz,
T. Anticic,
N. Antoniou,
J. Argyriades,
B. Baatar,
A. Blondel,
J. Blumer,
M. Bogomilov,
A. Bravar, [......],
M. Hartz,
A. K. Ichikawa,
H. Kubo,
A. D. Marino,
K. Matsuoka,
A. Murakami,
T. Nakaya,
K. Suzuki,
T. Yuan,
E. D. Zimmerman
[show abstract]
[hide abstract]
ABSTRACT: The T2K long-baseline neutrino oscillation experiment in Japan needs precise
predictions of the initial neutrino flux. The highest precision can be reached
based on detailed measurements of hadron emission from the same target as used
by T2K exposed to a proton beam of the same kinetic energy of 30 GeV. The
corresponding data were recorded in 2007-2010 by the NA61/SHINE experiment at
the CERN SPS using a replica of the T2K graphite target. In this paper details
of the experiment, data taking, data analysis method and results from the 2007
pilot run are presented. Furthermore, the application of the NA61/SHINE
measurements to the predictions of the T2K initial neutrino flux is described
and discussed.
07/2012;
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Peter Seyboth,
Collaboration,
S. V. Afanasiev,
T. Anticic,
D. Barna,
J. Bartke,
R. A. Barton,
L. Betev,
H. Bialkowska,
A. Billmeier, [......],
D. Varga,
M. Vassiliou,
G. I. Veres,
G. Vesztergombi,
D. Vranic,
S. Wenig,
A. Wetzler,
I. KYoo,
J. Zaranek,
J. Zimanyi
[show abstract]
[hide abstract]
ABSTRACT: Experiment NA49 at the CERN SPS uses a large acceptance detector for a systematic study of particle yields and correlations
in nucleus-nucleus, nucleon-nucleus and nucleon-nucleon collisions. Preliminary results for Pb+Pb collisions at 40, 80 and
158 A⋅GeV beam energy shown and compared to measurements at lower and higher energies.
Pramana 04/2012; 60(4):725-737. · 0.57 Impact Factor
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The Collaboration: N. Abgrall,
A. Aduszkiewicz,
T. Anticic,
N Antoniou,
J. Argyriades,
B Baatar,
A Blondel,
J. Blumer,
M. Bogusz,
L. Boldizsar, [......],
D. Veberic,
V. V. Vechernin,
G Vesztergombi,
A. Wilczek,
Z. Wlodarczyk,
A. Wojtaszek-Szwarc,
J. -G. Yi,
I. K. Yoo,
L. Zambelli,
W. Zipper
[show abstract]
[hide abstract]
ABSTRACT: Spectra of positively charged kaons in p+C interactions at 31 GeV/c were
measured with the NA61/SHINE spectrometer at the CERN SPS. The analysis is
based on the full set of data collected in 2007 with a graphite target with a
thickness of 4% of a nuclear interaction length. Interaction cross sections and
charged pion spectra were already measured using the same set of data. These
new measurements in combination with the published ones are required to improve
predictions of the neutrino flux for the T2K long baseline neutrino oscillation
experiment in Japan. In particular, the knowledge of kaon production is crucial
for precisely predicting the intrinsic electron neutrino component and the high
energy tail of the T2K beam. The results are presented as a function of
laboratory momentum in 2 intervals of the laboratory polar angle covering the
range from 20 up to 240 mrad. The kaon spectra are compared with predictions of
several hadron production models. Using the published pion results and the new
kaon data, the K+/\pi+ ratios are computed.
12/2011;
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T. Anticic,
B. Baatar,
D. Barna,
J. Bartke,
H. Beck,
L. Betev,
H. Bialkowska,
C. Blume,
M. Bogusz,
B. Boimska, [......],
T. Susa,
M. Szuba,
M. Utvic,
D. Varga,
M. Vassiliou,
G. Veres,
G. Vesztergombi,
D. Vranic,
Z. Wlodarczyk,
A. Wojtaszek-Szwarc
[show abstract]
[hide abstract]
ABSTRACT: The momentum correlation between protons and lambda particles emitted from
central Pb+Pb collisions at sqrt(s_{NN}) = 17.3 GeV was studied by the NA49
experiment at the CERN SPS. A clear enhancement is observed for small relative
momenta (q_{inv} < 0.2 GeV). By fitting a theoretical model, which uses the
strong interaction between the proton and the lambda in a given pair, to the
measured data a value for the effective source size is deduced. Assuming a
static Gaussian source distribution we derive an effective radius parameter of
R_G = 3.02 \pm 0.20$(stat.)^{+0.44}_{-0.16}(syst.) fm.
03/2011;
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N. Abgrall,
A. Aduszkiewicz,
B Andrieu,
T. Anticic,
N Antoniou,
J. Argyriades,
A. G. Asryan,
B Baatar,
A Blondel,
J. Blumer, [......],
M. Unger,
M Vassiliou,
V. V. Vechernin,
G Vesztergombi,
A. Wilczek,
Z. Wlodarczyk,
A Wojtaszek,
J. -G. Yi,
I. K. Yoo,
W. Zipper
[show abstract]
[hide abstract]
ABSTRACT: Interaction cross sections and charged pion spectra in p+C interactions at 31
GeV/c were measured with the large acceptance NA61/SHINE spectrometer at the
CERN SPS. These data are required to improve predictions of the neutrino flux
for the T2K long baseline neutrino oscillation experiment in Japan. A set of
data collected during the first NA61/SHINE run in 2007 with an isotropic
graphite target with a thickness of 4% of a nuclear interaction length was used
for the analysis. The measured p+C inelastic and production cross sections are
257.2 +- 1.9 +- 8.9 mb and 229.3 +- 1.9 +- 9.0 mb, respectively. Inclusive
production cross sections for negatively and positively charged pions are
presented as a function of laboratory momentum in 10 intervals of the
laboratory polar angle covering the range from 0 up to 420 mrad. The spectra
are compared with predictions of several hadron production models.
02/2011;
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T. Anticic,
B Baatar,
D Barna,
J. Bartke,
H. Beck,
L Betev,
H Bialkowska,
C Blume,
M. Bogusz,
B Boimska, [......], H. Strobele,
T Susa,
M. Szuba,
M. Utvic,
D Varga,
M. Vassiliou G. I. Veres,
G Vesztergombi,
D Vranic,
Z Włodarczyk,
A. Wojtaszek-Szwarc
[show abstract]
[hide abstract]
ABSTRACT: The yields of (anti-)protons were measured by the NA49 Collaboration in
centrality selected Pb+Pb collisions at 40A GeV and 158A GeV. Particle
identification was obtained in the laboratory momentum range from 5 to 63 GeV/c
by the measurement of the energy loss dE/dx in the TPC detector gas. The
corresponding rapidity coverage extends 1.6 units from mid-rapidity into the
forward hemisphere. Transverse mass spectra, the rapidity dependences of the
average transverse mass, and rapidity density distributions were studied as a
function of collision centrality. The values of the average transverse mass as
well as the midrapidity yields of protons when normalized to the number of
wounded nucleons show only modest centrality dependences. In contrast, the
shape of the rapidity distribution changes significantly with collision
centrality, especially at 40A GeV. The experimental results are compared to
calculations of the HSD and UrQMD transport models.
Phys. Rev. C. 09/2010; 83(1).
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W. Krzemien,
I. Frohlich,
M. Kajetanowicz,
K Korcyl,
M. Palka,
P. Salabura,
C. Schrader,
P. Skott, H. Strobele,
J. Stroth,
A. Tarantola,
M. Traxler,
R. Trebacz
[show abstract]
[hide abstract]
ABSTRACT: TRB module is a multi-purpose Trigger and Readout Board with on-board DAQ functionality developed for the upgrade of the HADES experiment. It contains single computer chip (Etrax) running Linux and the 100 Mbit/s Ethernet interface. It has been orginally designed as the 128-channel Time to Digital Converter based on the HPTDC chip from CERN. The new version of TRB contains 2 Gbit/s optical link and interface connector (15 Gbit/s) implementing the add-on card concept and making the board more flexible. Moreover, FPGA chip (Xilinx, Virtex 4 LX 40) and TigerSharc DSP provide new computing resources which can be used to run on-line analysis algorithms. The TRB is proposed as a prototype of base readout module for the planned detector systems PANDA and CBM at the future FAIR facility at GSI-Darmstadt.
11/2008;
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[show abstract]
[hide abstract]
ABSTRACT: One of the main goals of the HADES-at-FAIR upgrade project is to achieve sustained trigger rates of 20 kHz in the Au+Au heavy-ion collision system at energies up to 8 GeV/u. In this context, a fast and reliable data acquisition of the 24 Multiwire Drift Chambers (MDCs) is developed. The general concept of the upgrade is based on the Trigger and Readout Board (TRB). This hardware has two digital interface connectors for mounting add-on boards. In the special case of MDC, the add-on board is the interface to the detector Front End Electronic (FEE).
Nuclear Science Symposium Conference Record, 2008. NSS '08. IEEE; 11/2008
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M. Palka,
M. Bohmer,
I. Frohlich,
M. Kajetanowicz,
J. Michel,
P. Salabura,
P. Skott,
J. Stroth, H. Strobele,
A. Tarantola,
M. Traxler,
R. Trebacz,
E. Usenko,
S. Yurevich
[show abstract]
[hide abstract]
ABSTRACT: HADES (High Acceptance Di-Electron Spectrometer) is a running experiment installed at the SIS-18 synchrotron (GSI, Germany). The detector system has eighty thousands electronic channels provided by several different detectors: RICH (Ring Imaging Cherenkov Detector), RPC, Multi-wire Drift Chambers (MDCs), TOF (Time of flight wall), preShower (Shower) and beam detectors. During recent years, HADES has completed severals physics runs, from elementary reactions up to moderate ion systems. Currently, the detector undergoes an upgrade (“HADES-at-FAIR”) for both the experimental setup and the data acquisition, in order to be able to take data in the Au+Au collision system at 8 GeV/u with a sustained trigger rate of 20 kHz. The average amount of data is expected to be 300MB/s. The DAQ upgrade includes the digital readout, the trigger distribution and event builder electronics and, moreover, also part of the front end electronics.
Nuclear Science Symposium Conference Record, 2008. NSS '08. IEEE; 11/2008
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I. Frohlich,
M. Kajetanowicz,
K. Korcyl,
W. Krzemien,
M. Palka,
P. Salabura,
C. Schrader,
P. Skott, H. Strobele,
J. Stroth,
A. Tarantola,
M. Traxler,
R. Trebacz,
S. Yurevich
[show abstract]
[hide abstract]
ABSTRACT: HADES is a running spectrometer installed at GSI, Germany. PANDA and CBM are planned detector systems for the new FAIR facility at GSI. For these detectors, a general-purpose trigger and readout board with on-board DAQ functionality was developed. The original motivation for this project was the implementation of a 128-channel time to digital converter (TDC) with a time resolution of sigma=40 ps based on the HPTDC chip from CERN into a fully fledged data acquisition system. The application of the board is detector independent, includes a 2 Gbit/s optical link and has the option to employ the TDC chips and/or to integrate versatile add-on boards through 16 Gbit/s connectors. The latter one may interface to the front end electronics of other types of detectors. A large FPGA (Xilinx Virtex 4 LX40) and a TigerSharc DSP can be used as on-board resources for trigger and on-line analysis algorithms. Data transfer to mass storage and slow control is done via an ETRAX processor running Linux and a 100 Mbit/s Ethernet interface.
IEEE Transactions on Nuclear Science 03/2008; · 1.45 Impact Factor
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A BAMBERGER,
J BARTKE,
H BIALKOWSKA,
R BOCK,
R BROCKMANN,
SI CHASE,
C DEMARZO,
M DEPALMA,
I DERADO,
V ECKARDT, [......],
P SPINELLI,
R STOCK, H STROBELE,
A THOMAS,
M TINCKNELL,
L TEITELBAUM,
S TONSE,
G VESZTERGOMBI,
D VRANIC,
S WENIG
Zeitschrift Fur Physik C-Particles and Fields. 01/1989; 43(1):25-35.
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A Kugler,
H Agakishiev,
C Agodi,
H Alvarez-Pol,
A Balanda,
G Bellia,
J Bielcik,
M Bohmer,
J Boyard,
P Braun-Munzinger, [......],
A Toia,
M Traxler,
H Tsertos,
V Wagner,
M Wisniowski,
T Wojcik,
J Wustenfeld,
Y Zanevsky,
D Zovinec,
P Zumbruch
[show abstract]
[hide abstract]
ABSTRACT: The HADES spectrometer installed at GSI Darmstadt is devoted to the study of the production of di- lepton pairs from vector meson decays in relativistic nucleus-nucleus collisions, as well as proton- and pion-induced reactions. Extraction of rare lepton pairs in high hadron multiplicity events requires an efficient particle identification ( PID). In HADES charged particles momentum is measured by a tracking system surrounding the toroidal super conducting magnet, and velocity and energy loss is provided by a TOF detector. Leptons are identified by a Rich as well as a Shower detector. The particle identification method is using full experimental information from all subdetectors. To demonstrate the method performance, single particle spectra of charged hadrons and leptons from C+C at 2 A GeV will be presented and compared with results of corresponding simulations. The proton and pion yields an m T and rapidity distributions will be compared with existing data. Very preliminary results of lepton analysis will be shown as well.
Acta Physica Slovaca 54(4):375-384. · 2.17 Impact Factor
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I. Frohlich,
M. Kajetanowicz,
K Korcyl,
W. Krzemien,
M. Palka,
P. Salabura,
C. Schrader,
P. Skott, H. Strobele,
J. Stroth,
A. Tarantola,
M. Traxler,
R. Trebacz
[show abstract]
[hide abstract]
ABSTRACT: HADES is a running spectrometer installed at GSI,Germany. PANDA and CBM are planned detector systems for the new FAIR facility at GSI. For these detectors, a general-purpose trigger and readout board (TRB) with on-board DAQ functionality was developed. Data readout and slow control is done via an Etrax processor running Linux and a 100 Mbit/s Ethernet interface. The original motivation and application of the hardware is the implementation of a 128-channel Time to Digital Converter (TDC) electronics based on the HPTDC from CERN (we achieve sigma = 40 ps resolution). However, it has been developed in a way to be detector independent and thus may serve for any high-speed data acquisition by using a flexible add-on board concept (interface connector 15 Gbit/s) and an optical link (2 Gbit/s). A large FPGA (Xilinx Virtex 4 LX40) and a TigerSharc DSP can be used as on-board resources for trigger and on-line analysis algorithms.
Real-Time Conference, 2007 15th IEEE-NPSS;
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J. Markert,
G. Agakishiev,
C. Agodi,
A. Balanda,
G. Bellia,
D. Belver,
A. Belyaev,
A Blanco,
M. Bohmer,
J. L. Boyard, [......],
R. Holzmann,
A. Ierusalimov,
I. Iori,
A. Ivashkin,
M. Jurkovic,
B. Kampfer,
K. Kanaki,
T. Karavicheva,
D. Kirschner,
I. Koenig
[show abstract]
[hide abstract]
ABSTRACT: 5 pages, 2 figures.-- ISI Article Identifier: 000248251400153 Printed version published on Aug 2007. We report on a measurement of electron pair production in C-12(+) C-12 collisions at an incident energy of 2 GeV per nucleon with the HADES spectrometer. The measured pair production probabilities span over five orders of magnitude from the π(0)-Dalitz to the ρ/w invariant-mass region. Dalitz decays of π(0) and η account for all the yield up to 0.15 GeV/c^2, but for only about 50% above this mass. The excess yield is in agreement with the former DLS result if one assumes that it scales with beam energy like pion production. A preliminary analysis of C-12(+) C-12 collisions at an incident energy of 1 A GeV, measured with the HADES detector, supports this scenario. The collaboration gratefully acknowledges the support by BMBF grants 06TM970I, 06GI146I, 06F-140 and 06DR120 (Germany), by GSI (TM-FR1,GI/ME3,OF/STR), by grants GA CR 202/00/1668 and GA AS CR IAA1048304 (Czech Republic), by grant KBN 1P03B 056 29 (Poland), by INFN (Italy), by CNRS/IN2P3 (France), by grants MCYT FPA2000-2041-C02-02 and XUGA PGID T02PXIC20605PN (Spain), by grant UCY-10.3.11.12 (Cyprus), by INTAS grant 03-51-3208 and by EU contract RII3-CT-2004-506078. Peer reviewed
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J. Pietraszko,
G. Agakishiev,
C. Agodi,
A. Balanda,
G. Bellia,
D. Belver,
A. Belyaev,
A Blanco,
M. Böhmer,
J. L. Boyard, [......],
Y. C. Pachmayer,
M. Palka,
V. Pechenov,
T. Pérez,
R. Pleskac,
V. Pospisil,
W. Przygoda,
B. Ramstein,
A. Reshetinn,
M. Roy-Stephan
[show abstract]
[hide abstract]
ABSTRACT: 9 pages.-- ISI Article Identifier: 000250926800024 The High Acceptance Di-Electron Spectrometer HADES has been constructed at the SIS accelerator (GSI Darmstadt) to investigate electron-positron pairs produced in proton, pion and heavy ion induced reactions. The main goal of these studies is to explore properties of hadrons in nuclear matter. The apparatus and the experimental results from C+C at 2.0 AGeV and 1.0 AGeV and p+p at 2.2 GeV compared with Monte-Carlo events from a generator based on known cross-sections and branching ratios are presented. Peer reviewed
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I. Fröhlich,
G. Agakishiev,
C. Agodi,
A. Balanda,
G. Bellia,
D. Belver,
A. Belyaev,
A Blanco,
M. Bohmer,
J. L. Boyard, [......],
R. Krucken,
A. Kugler,
W. Kuhn,
A. Kurepin,
J. Lamas-Valverde,
S Lang,
S Lange,
L. Lopes,
A. Mangiarotti,
J Marin
[show abstract]
[hide abstract]
ABSTRACT: 5 pages, 4 figures.-- PACS nrs.: 13.25.Jx, 13.40.Hq, 14.40.Aq, 25.40.Ve.-- ISI Article Identifier: 000245667300102.-- ArXiv pre-print available at: http://arxiv.org/abs/nucl-ex/0610048 Contributed to: The IVth International Conference on Quarks and Nuclear Physics - QNP 2006 (Madrid, Spain, June 5-10, 2006). e(+) e(-) production was studied using the High Acceptance DiElectron Spectrometer (HADES). In pp collisions at 2.2GeV kinetic beam energy, the exclusive η production and the Dalitz decay η -> γe(+)e(-) have been reconstructed. The electromagnetic form factor of the latter decay was found to be in good agreement with the existing theoretical predictions. In addition, an inclusive e(+)e(-) invariant-mass spectrum from the C-12 + C-12 reaction at 2AGeV is presented and compared with a simplified thermal model. The HADES collaboration gratefully acknowledges the support by BMBF grants 06TM970I, 06GI146I, 06F-140, and 06DR120 (Germany), by GSI (TM-FR1,GI/ME3,OF/STR), by grants GA CR 202/00/1668 and GA AS CR IAA1048304 (Czech Republic), by grant KBN 1P03B05629 (Poland), by INFN (Italy), by CNRS/IN2P3 (France), by grants MCYT FPA2000-2041-C02-02 and XUGA PGID T02PXIC20605PN (Spain), by grant UCY-10.3.11.12 (Cyprus), by INTAS grant 03-51-3208 and EU contract RII3-CT-2004-506078. Peer reviewed
