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1. Light-yield response of liquid scintillators using 2–6 MeV tagged neutrons

Author

Mauritzson, N, Fissum, KG, Annand, JRM, Perrey, H, Al Jebali, R, Backis, A, Hall-Wilton, R, Kanaki, K, Maulerova-Subert, V, Messi, F, Frost, RJW, Rofors, E, and Scherzinger, J

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Other Physical Sciences, Nuclear & Particles Physics, Nuclear and plasma physics
Abstract

Knowledge of the neutron light-yield response is crucial to the understanding of scintillator-based neutron detectors. In this work, neutrons from 2–6 MeV have been used to study the scintillation light-yield response of the liquid scintillators NE 213A, EJ 305, EJ 331 and EJ 321P using event-by-event waveform digitization. Energy calibration was performed using a GEANT4 model to locate the edge positions of the Compton distributions produced by gamma-ray sources. The simulated light yield for neutrons from a PuBe source was compared to measured recoil proton distributions, where neutron energy was selected by time-of-flight. This resulted in an energy-dependent Birks parameterization to characterize the non-linear response to the lower energy neutrons. The NE 213A and EJ 305 results agree very well with existing data and are reproduced nicely by the simulation. New results for EJ 331 and EJ 321P, where the simulation also reproduces the data well, are presented.

Published
2024

2. Light-yield response of liquid scintillators using 2--6 MeV tagged neutrons

Author

Mauritzson, N., Fissum, K. G., Annand, J. R. M., Perrey, H., Jebali, R. Al, Backis, A., Hall-Wilton, R., Kanaki, K., Maulerova-Subert, V., Messi, F., Frost, R. J. W., Rofors, E., and Scherzinger, J.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Knowledge of the neutron light-yield response is crucial to the understanding of scintillator-based neutron detectors. In this work, neutrons from 2--6 MeV have been used to study the scintillation light-yield response of the liquid scintillators NE 213A, EJ 305, EJ 331 and EJ 321P using event-by-event waveform digitization. Energy calibration was performed using a GEANT model to locate the edge positions of the Compton distributions produced by gamma-ray sources. The simulated light yield for neutrons from a PuBe source was compared to measured recoil proton distributions, where neutron energy was selected by time-of-flight. This resulted in an energy-dependent Birks parametrization to characterize the non-linear response to the lower energy neutrons. The NE 213A and EJ 305 results agree very well with existing data and are reproduced nicely by the simulation. New results for EJ 331 and EJ 321P, where the simulation also reproduces the data well, are presented., Comment: 31 pages, 15 figures, 4 tables

Published
2023

3. Evaluation of a method for time-of-flight, wavelength and distance calibration for neutron scattering instruments by means of a mini-chopper and standard neutron monitors

Author

Vergara, L., Arai, M., Woracek, R., Olsson, M., Quintanilla, A., Alcock, S., Nilsson, J., Kanaki, K., Kadletz, P. M., Kirstein, O., Hall-Wilton, R., and Tsapatsaris, N.

Subjects
Physics - Instrumentation and Detectors
Abstract

Accurate conversion of neutron time-of-flight (TOF) to wavelength, and its uncertainty, is of fundamental importance to neutron scattering measurements. Especially in cases where instruments are highly configurable, the determination of the absolute wavelength after any change must always be performed. Inspired by the manner with which neutron spectrometers determine the absolute wavelength, we evaluate for the first time, in the author's knowledge, a commonly used method for converting TOF to neutron wavelength, the distance of a monitor from the source of neutrons and we analytically calculate the uncertainty contributions that limit the precision of the conversion. The method was evaluated at the V20 test beamline at the Helmholtz Zentrum Berlin (HZB), emulating the ESS source with a pulse of 2.86 ms length and 14 Hz repetition rate, by using a mini-chopper operated at 140 Hz, beam monitors (BMs) and data acquisition infrastructure. The mini-chopper created well-defined neutron pulses and the BM was placed at two positions, enabling the average wavelength of each of the pulses created to be determined. The used experimental setup resulted in absolute wavelength determination at the monitor positions with a $\delta \lambda_{mean} / \lambda_{mean}$ of $\sim$1.8% for $\lambda >4$ \r{A}. With a modest increase of the distance between the reference monitor positions a $\delta \lambda_{mean} / \lambda_{mean}$ of below 0.5% can be achieved. Further improvements are possible by using a thinner monitor, smaller chopper disc openings and a higher rotational speed chopper. The method requires only two neutron measurements and doesn't necessitate the use of crystals or complex fitting, and could constitute a suitable addition to imaging, diffraction, reflectometers and small angle neutron scattering instruments, at spallation sources, that do not normally utilise fast choppers.

Published
2022
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4. Technique for the measurement of intrinsic pulse-shape discrimination for organic scintillators using tagged neutrons

Author

Mauritzson, N., Fissum, K. G., Annand, J. R. M., Perrey, H., Frost, R. J. W., Jebali, R. Al, Backis, A., Hall-Wilton, R., Kanaki, K., Maulerova-Subert, V., Maurer, C., Messi, F., and Rofors, E.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

Fast-neutron/gamma-ray pulse-shape discrimination has been performed for the organic liquid scintillators NE 213A and EJ 305 using a time-of-flight based neutron-tagging technique and waveform digitization on an event-by-event basis. Gamma-ray sources and a Geant4-based simulation were used to calibrate the scintillation-light yield. The difference in pulse shape for the neutron and gamma-ray events was analysed by integrating selected portions of the digitized waveform to produce a figure-of-merit for neutron/gamma-ray separation. This figure-of-merit has been mapped as a function of detector threshold and also of neutron energy determined from time-of-flight. It shows clearly that the well-established pulse-shape discrimination capabilities of NE 213A are superior to those of EJ 305. The extra information provided by the neutron-tagging technique has resulted in a far more detailed assessment of the pulse-shape discrimination capabilities of these organic scintillators., Comment: 22 pages, 12 figures, 2 tables

Published
2022
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5. Multitube monitors: a new-generation of neutron beam monitors

Author

Lafont, F., Barkats, D., Buffet, J-C., Cuccaro, S., Guerard, B., Lai, C-C, Marchal, J., Pentenero, J., Sartor, N., Hall-Wilton, R., Kanaki, K., Robinson, L., and Svensson, P O.

Subjects
Physics - Instrumentation and Detectors
Abstract

With the renewal of many neutron science instruments and the commissioning of new neutron facilities, there is a rising demand for improved neutron beam monitoring systems with reduced beam perturbations and higher counting rate capability. Fission chambers are the most popular beam monitors; however, their use on some instruments may be prevented by the background generated by fast neutrons emitted during neutron captures in 235U and by neutrons scattered in the material of the fission chamber. Multitube detectors, on the other hand, offer a good alternative with minimum beam perturbations. The purpose of this paper is to report and analyse the results of the measurements performed with several Multitubes used for beam monitoring. We show that the transparency of Multitube beam monitors is 97.6 +/-0.4 %, and that their detection efficiency is uniform, with a deviation from the mean value < 0.7%. A counting rate reduction of 10% due to pile-up effects is measured at a rate of 550 kHz. In addition to neutron beam intensity monitoring, the Multitube can be configured for 1-dimensional or 2-dimensional localisation. We present the preliminary results of these additional functionalities., Comment: 15 pages, 16 figures

Published
2022
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6. Uniformity of response of Uranium fission chambers used as neutron beam monitors

Author

Lafont, F., Guerard, B., Hall-Wilton, R., and Kanaki, K.

Subjects
Physics - Instrumentation and Detectors
Abstract

Uranium fission chambers are commonly used for neutron beam monitoring in neutron research facilities. The challenges brought with the renewing or commissioning of new neutron facilities encourage to minimize the interaction between the monitor and the neutron beam. In order to characterize both their detection efficiency and transmission factor, several fission chambers, have been scanned on the CT1 monochromatic beam line of the ILL. Results show that the monitor transparency, measured at the center of the monitor, varies from 90% to 96%, and that the detection efficiency varies by as much as 50% over the active area., Comment: 10 pages, 8 figures

Published
2021
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7. Geant4-based calibration of an organic liquid scintillator

Author

Mauritzson, N., Fissum, K. G., Perrey, H., Annand, J. R. M., Frost, R. J. W., Hall-Wilton, R., Jebali, R. Al, Kanaki, K., Maulerova, V., Messi, F., and Rofors, E.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

A light-yield calibration of an NE 213A organic liquid scintillator detector has been performed using both monoenergetic and polyenergetic gamma-ray sources. Scintillation light was detected in a photomultiplier tube, and the corresponding pulses were subjected to waveform digitization on an event-by-event basis. The resulting Compton edges have been analyzed using a Geant4 simulation of the detector which models both the interactions of the ionizing radiation as well as the transport of scintillation photons. The simulation is calibrated and also compared to well-established prescriptions used to determine the Compton edges, resulting ultimately in light-yield calibration functions. In the process, the simulation-based method produced information on the gain and intrinsic pulse-height resolution of the detector. It also facilitated a previously inaccessible understanding of the systematic uncertainties associated with the calibration of the scintillation-light yield. The simulation-based method was also compared to well-established numerical prescriptions for locating the Compton edges. Ultimately, the simulation predicted as much as 17% lower light-yield calibrations than the prescriptions. These calibrations indicate that approximately 35% of the scintillation light associated with a given gamma-ray reaches the photocathode. It is remarkable how well two 50 year old prescriptions for calibrating scintillation-light yield in organic scintillators have stood the test of time., Comment: 20 pages, 8 figures, 4 tables

Published
2021
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9. Self-Shielding Copper Substrate Neutron Supermirror Guides

Author

Bentley, P. M., Hall-Wilton, R., Cooper-Jensen, C. P., Cherkashyna, N., Kanaki, K., Schanzer, C., Schneider, M., and Boeni, P.

Subjects
Physics - Instrumentation and Detectors
Abstract

The invention of self-shielding copper substrate neutron guides is described, along with the rationale behind the development, and the realisation of commercial supply. The relative advantages with respect to existing technologies are quantified. These include ease of manufacture, long lifetime, increased thermal conductivity, and enhanced fast neutron attenuation in the keV-MeV energy range. Whilst the activation of copper is initially higher than for other material options, for the full energy spectrum, many of the isotopes are short-lived, so that for realistic maintenance access times the radiation dose to workers is expected to be lower than steel and in the lowest zoning category for radiation safety outside the spallation target monolith. There is no impact on neutron reflectivity performance relative to established alternatives, and the manufacturing cost is similar to other polished metal substrates.

Published
2021
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10. Simulation of the Response of the Solid State Neutron Detector for the European Spallation Source

Author

Boyd, L., Rofors, E., Annand, J. R. M., Fissum, K. G., Hall-Wilton, R., Jebali, R. Al, Kanaki, K., Livingston, K., Maulerova, V., Mauritzson, N., Montgomery, R., Perrey, H., and Seitz, B.

Subjects
Physics - Instrumentation and Detectors, Physics - Computational Physics
Abstract

The characteristics of the Solid-state Neutron Detector, under development for neutron-scattering measurements at the European Spallation Source, have been simulated with a Geant4-based computer code. The code models the interations of thermal neutrons and ionising radiation in the 6Li-doped scintillating glass of the detector, the production of scintillation light and the transport of optical, scintillation photons through the the scintillator, en route to the photo-cathode of the attached multi-anode photomultiplier. Factors which affect the optical-photon transport, such as surface finish, pixelation of the glass sheet, provision of a front reflector and optical coupling media are compared. Predictions of the detector response are compared with measurements made with neutron and gamma-ray sources, a collimated alpha source and finely collimated beams of 2.5 MeV protons and deuterons., Comment: Preprint 22 pages, 12 figures, published in NIM A

Published
2020
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11. Response of a Li-glass/multi-anode photomultiplier detector to collimated thermal-neutron beams

Author

Rofors, E., Mauritzson, N., Perrey, H., Jebali, R. Al, Annand, J. R. M., Boyd, L., Christensen, M. J., Clemens, U., Desert, S., Engels, R., Fissum, K. G., Frielinghaus, H., Gheorghe, C., Hall-Wilton, R., Jaksch, S., Kanaki, K., Kazi, S., Kemmerling, G., Jansa, I. Llamas, Maulerova, V., Montgomery, R., Richter, T., Scherzinger, J., Seitz, B., and Shetty, M.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The response of a position-sensitive Li-glass scintillator detector being developed for thermal-neutron detection with 6 mm position resolution has been investigated using collimated beams of thermal neutrons. The detector was moved perpendicularly through the neutron beams in 0.5 to 1.0 mm horizontal and vertical steps. Scintillation was detected in an 8 X 8 pixel multi-anode photomultiplier tube on an event-by-event basis. In general, several pixels registered large signals at each neutron-beam location. The number of pixels registering signal above a set threshold was investigated, with the maximization of the single-hit efficiency over the largest possible area of the detector as the primary goal. At a threshold of ~50% of the mean of the full-deposition peak, ~80% of the events were registered in a single pixel, resulting in an effective position resolution of ~5 mm in X and Y. Lower thresholds generally resulted in events demonstrating higher pixel multiplicities, but these events could also be localized with ~5 mm position resolution., Comment: 23 pages, 8 figures

Published
2020
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12. New high-sensitivity searches for neutrons converting into antineutrons and/or sterile neutrons at the European Spallation Source

Author

Addazi, A., Anderson, K., Ansell, S., Babu, K., Barrow, J., Baxter, D. V., Bentley, P. M., Berezhiani, Z., Bevilacqua, R., Bohm, C., Brooijmans, G., Broussard, J., Biondi, R., Dev, B., Crawford, C., Dolgov, A., Dunne, K., Fierlinger, P., Fitzsimmons, M. R., Fomin, A., Frost, M., Gardner, S., Galindo-Uribarri, A., Golubeva, E., Girmohanta, S., Greene, G. L., Greenshaw, T., Gudkov, V., Hall-Wilton, R., Heilbronn, L., Herrero-Garcia, J., Ito, G. Ichikawa T. M., Iverson, E., Johansson, T., Joensson, L., Jwa, Y-J., Kamyshkov, Y., Kanaki, K., Kearns, E., Kitaguchi, M., Kittelmann, T., Klinkby, E., Koerner, L. W., Kopeliovich, B., Kozela, A., Kudryatsev, V., Kupsc, A., Lee, Y., Lindroos, M., Makkinje, J., Marquez, J. I., Mohapatra, R., Meirose, B., Miller, T. M., Milstead, D., Morishima, T., Muhrer, G., Mumm, H. P., Nagamoto, K., Nesvizhevsky, V. V., Nilsson, T., Oskarsson, A., Paryev, E., Pattie Jr, R. W., Penttil, S., Pokotilovski, Y. N., Potashnikova, I., Redding, C., Richard, J-M, Ries, D., Rinaldi, E., Ruggles, A., Rybolt, B., Santoro, V., Sarkar, U., Saunders, A., Senjanovic, G., Serebrov, A. P., Shimizu, H. M., Shrock, R., Silverstein, S., Silvermyr, D., Snow, W. M., Takibayev, A., Townsend, L., Tkachev, I., Varriano, L., Vainshtein, A., de VRies, J., Woracek, R., Yamagata, Y., Young, A. R., Zanini, L., Zhang, Z., and Zimmer, O.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment
Abstract

The violation of Baryon Number, $\mathcal{B}$, is an essential ingredient for the preferential creation of matter over antimatter needed to account for the observed baryon asymmetry in the universe. However, such a process has yet to be experimentally observed. The HIBEAM/NNBAR %experiment program is a proposed two-stage experiment at the European Spallation Source (ESS) to search for baryon number violation. The program will include high-sensitivity searches for processes that violate baryon number by one or two units: free neutron-antineutron oscillation ($n\rightarrow \bar{n}$) via mixing, neutron-antineutron oscillation via regeneration from a sterile neutron state ($n\rightarrow [n',\bar{n}'] \rightarrow \bar{n}$), and neutron disappearance ($n\rightarrow n'$); the effective $\Delta \mathcal{B}=0$ process of neutron regeneration ($n\rightarrow [n',\bar{n}'] \rightarrow n$) is also possible. The program can be used to discover and characterise mixing in the neutron, antineutron, and sterile neutron sectors. The experiment addresses topical open questions such as the origins of baryogenesis, the nature of dark matter, and is sensitive to scales of new physics substantially in excess of those available at colliders. A goal of the program is to open a discovery window to neutron conversion probabilities (sensitivities) by up to three orders of magnitude compared with previous searches. The opportunity to make such a leap in sensitivity tests should not be squandered. The experiment pulls together a diverse international team of physicists from the particle (collider and low energy) and nuclear physics communities, while also including specialists in neutronics and magnetics.

Published
2020
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13. Time- and energy-resolved effects in the boron-10 based Multi-Grid and helium-3 based thermal neutron detectors

Author

Backis, A., Khaplanov, A., Jebali, R. Al, Ammer, R., Apostolidis, I., Birch, J., Lai, C. -C., Deen, P. P., Etxegarai, M., de Ruette, N., Ramos, J. Freita, Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Higuera, I. Lopez, Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.

Subjects
Physics - Instrumentation and Detectors
Abstract

The boron-10 based Multi-Grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few $\mu$eV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of ~ $\mu$s short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of $\mu$s wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube., Comment: 37 pages, 21 figures

Published
2020
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14. Response of a Li-glass/multi-anode photomultiplier detector to focused proton and deuteron beams

Author

Rofors, E., Pallon, J., Jebali, R. Al, Annand, J. R. M., Boyd, L., Christensen, M. J., Clemens, U., Desert, S., Elfman, M., Engels, R., Fissum, K. G., Frielinghaus, H., Frost, R., Gardner, S., Gheorghe, C., Hall-Wilton, R., Jaksch, S., Kanaki, K., Kemmerling, G., Kristiansson, P., Livingston, K., Maulerova, V., Mauritzson, N., Montgomery, R., Perrey, H., Richter, T., Scherzinger, J., Seitz, B., and Shetty, M.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The response of a position-sensitive Li-glass based scintillation detector to focused beams of 2.5 MeV protons and deuterons has been investigated. The beams were scanned across the detector in 0.5 mm horizontal and vertical steps perpendicular to the beams. Scintillation light was registered using an 8 by 8 pixel multi-anode photomultiplier tube. The signal amplitudes were recorded for each pixel on an event-by-event basis. Several pixels generally registered considerable signals at each beam location. The number of pixels above set thresholds were investigated, with the optimization of the single-hit efficiency over the largest possible area as the goal. For both beams, at a threshold of ~50% of the mean of the full-deposition peak, ~80% of the events were registered in a single pixel, resulting in an effective position resolution of ~5 mm in X and Y., Comment: 22 pages, 8 figures, to be submitted to Nucl. Instr. and Meth. in Phys. Res. A

Published
2020
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15. Parasitic neutron beam monitoring: proof of concept on gamma monitoring of neutron chopper phases

Author

Issa, F., Hall-Wilton, R., Quintanilla, A., Olsson, M., Zielinski, D., Kanaki, K., and Tsapatsaris, N.

Subjects
Physics - Instrumentation and Detectors
Abstract

Neutron beam monitors are an essential diagnostic component of neutron scattering facilities. They are used to measure neutron flux, calibrating experiments performed on the instruments, allowing measurement of facility performance, understanding of the effect on the neutrons of beam-line components (such as choppers), calibration of detectors and tracking of beam stability. Ideally beam monitors {should} not perturb the beam. Previous work shows commercial beam monitors attenuate the beam by a few percent in the worst case due to the 1-2 mm thick Aluminium entrance and exit windows and the material inside. Parasitic methods of neutron beam diagnostics, where there is no beam monitor directly in the beam, would be preferable. This paper presents the concept of a parasitic method of monitoring the beam which can be used for neutron chopper phasing. This is achieved by placing a gamma detector close to a rotating chopper and measures a signal proportional to the flux absorbed by the chopper. Neutrons interact with the Boron absorber on the chopper disc lead to gamma emission at 480 keV. Detection of these gamma rays is used to determine the chopper phasing and timing. Potentially information on the flux of the beamline can be extracted. Results from a proof of concept implementation show that diagnosis of neutron chopper phases is feasible., Comment: 6 pages, 8 figures. Version: accepted Euro Physics Letters

Published
2020

16. A simulational study of the indirect geometry neutron spectrometer, BIFROST at the European Spallation Source, from neutron source position to detector position

Author

Klausz, M., Kanaki, K., Kittelmann, T., Toft-Petersen, R., Birk, J. O., Olsen, M. A., Zagyvai, P., and Hall-Wilton, R. J.

Subjects
Physics - Instrumentation and Detectors
Abstract

The European Spallation Source (ESS) is intended to become the most powerful spallation neutron source in the world and the flagship of neutron science in the upcoming decades. The exceptionally high neutron flux will provide unique opportunities for scientific experiments, but also set high requirements for the detectors. One of the most challenging aspects is the rate capability and in particular the peak instantaneous rate capability, i.e. the number of neutrons hitting the detector per channel or cm$^2$ at the peak of the neutron pulse. The primary purpose of this paper is to estimate the incident rates that are anticipated for the BIFROST instrument planned for ESS, and also to demonstrate the use of powerful simulation tools for the correct interpretation of neutron transport in crystalline materials. A full simulation model of the instrument from source to detector position, implemented with the use of multiple simulation software packages is presented. For a single detector tube instantaneous incident rates with a maximum of 1.7 GHz for a Bragg peak from a single crystal, and 0.3 MHz for a vanadium sample are found. This paper also includes the first application of a new pyrolytic graphite model, and a comparison of different simulation tools to highlight their strengths and weaknesses., Comment: 45 pages, 20 figures

Published
2020

17. Performance evaluation of the Boron Coated Straws detector with Geant4

Author

Klausz, M., Kanaki, K., Zagyvai, P., and Hall-Wilton, R. J.

Subjects
Physics - Instrumentation and Detectors
Abstract

The last decade has witnessed the development of several alternative neutron detector technologies, as a consequence of upcoming neutron sources and upgrades, as well the world-wide shortage of $^3$He. One branch of development is the family of $^{10}$B-based gaseous detectors. This work focuses on the boron coated straws (BCS) by Proportional Technologies Inc., a commercial solution designed for use in homeland security and neutron science. A detailed Geant4 simulation study of the BCS is presented, which investigates various aspects of the detector performance, e.g. efficiency, activation, absorption and the impact of scattering on the measured signal. The suitability of the BCS detector for Small Angle Neutron Scattering (SANS), direct chopper spectrometry and imaging is discussed., Comment: 50 pages, 37 figures, minor changes after review, results unchanged

Published
2019
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18. Response of a Li-glass/multi-anode photomultiplier detector to $\alpha$-particles from $^{241}$Am

Author

Rofors, E., Perrey, H., Jebali, R. Al, Annand, J. R. M., Boyd, L., Clemens, U., Desert, S., Engels, R., Fissum, K. G., Frielinghaus, H., Gheorghe, C., Hall-Wilton, R., Jaksch, S., Jalgén, A., Kanaki, K., Kemmerling, G., Maulerova, V., Mauritzson, N., Montgomery, R., Scherzinger, J., and Seitz, B.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The response of a position-sensitive Li-glass scintillator detector to $\alpha$-particles from a collimated $^{241}$Am source scanned across the face of the detector has been measured. Scintillation light was read out by an 8 X 8 pixel multi-anode photomultiplier and the signal amplitude for each pixel has been recorded for every position on a scan. The pixel signal is strongly dependent on position and in general several pixels will register a signal (a hit) above a given threshold. The effect of this threshold on hit multiplicity is studied, with a view to optimize the single-hit efficiency of the detector., Comment: 23 pages, 7 figures, to be submitted to Nuclear Instruments and Methods in Physics Research Section A

Published
2018
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19. Suppression of intrinsic neutron background in the Multi-Grid detector

Author

Dian, E., Kanaki, K., Khaplanov, A., Kittelmann, T., Zagyvai, P., and Hall-Wilton, R.

Subjects
Physics - Instrumentation and Detectors
Abstract

One of the key requirements for neutron scattering instruments is the Signal-to-Background ratio (SBR). This is as well a design driving requirement for many instruments at the European Spallation Source (ESS), which aspires to be the brightest neutron source of the world. The SBR can be effectively improved with background reduction. The Multi-Grid, a large-area thermal neutron detector with a solid boron carbide converter, is a novel solution for chopper spectrometers. This detector will be installed for the three prospective chopper spectrometers at the ESS. As the Multi-Grid detector is a large area detector with a complex structure, its intrinsic background and its suppression via advanced shielding design should be investigated in its complexity, as it cannot be naively calculated. The intrinsic scattered neutron background and its effect on the SBR is determined via a detailed Monte Carlo simulation for the Multi-Grid detector module, designed for the CSPEC instrument at the ESS. The impact of the detector vessel and the neutron entrance window on scattering is determined, revealing the importance of an optimised internal detector shielding. The background-reducing capacity of common shielding geometries, like side-shielding and end-shielding is determined by using perfect absorber as shielding material, and common shielding materials, like B$_{4}$C and Cd are also tested. On the basis of the comparison of the effectiveness of the different shielding topologies and materials, recommendations are given for a combined shielding of the Multi-Grid detector module, optimised for increased SBR., Comment: 26 pages, 18 figures, revised

Published
2018
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20. Scattered neutron background in thermal neutron detectors

Author

Dian, E., Kanaki, K., Ehlers, G., Hall-Wilton, R. J., Khaplanov, A., Kittelmann, T., and Zagyvai, P.

Subjects
Physics - Instrumentation and Detectors
Abstract

Inelastic neutron scattering instruments require very low background; therefore the proper shielding for suppressing the scattered neutron background, both from elastic and inelastic scattering is essential. The detailed understanding of the background scattering sources is required for effective suppression. The Multi-Grid thermal neutron detector is an Ar/CO$_{2}$ gas filled detector with a $^{10}$B$_{4}$C neutron converter coated on aluminium substrates. It is a large-area detector design that will equip inelastic neutron spectrometers at the European Spallation Source (ESS). To this end a parameterised Geant4 model is built for the Multi-Grid detector. This is the first time thermal neutron scattering background sources have been modelled in a detailed simulation of detector response. The model is validated via comparison with measured data of prototypes installed on the IN6 instrument at ILL and on the CNCS instrument at SNS. The effect of scattering originating in detector components is smaller than effects originating elsewhere., Comment: Minor typos corrected, 2 new references added. Updated simulation geometry in Section 4: extended results and discussion, unchanged main conclusion

Published
2018
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21. Fast neutron sensitivity of neutron detectors based on boron-10 converter layers

Author

Mauri, G., Messi, F., Kanaki, K., Hall-Wilton, R., Karnickis, E., Khaplanov, A., and Piscitelli, F.

Subjects
Physics - Instrumentation and Detectors, Physics - Applied Physics
Abstract

In the last few years many detector technologies for thermal neutron detection have been developed in order to face the shortage of 3He, which is now much less available and more expensive. Moreover the 3He-based detectors can not fulfil the requirements in performance, e.g. the spatial resolution and the counting rate capability needed for the new instruments. The Boron-10-based gaseous detectors have been proposed as a suitable choice. This and other alternatives technologies are being developed at ESS. Higher intensities mean higher signals but higher background as well. The signal-to-background ratio is an important feature to study, in particular the gamma-ray and the fast neutron contributions. This paper investigates, for the first time, the fast neutrons sensitivity of 10B-based thermal neutron detector. It presents the study of the detector response as a function of energy threshold and the underlying physical mechanisms. The latter are explained with the help of theoretical considerations and simulations.

Published
2017
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22. The neutron tagging facility at Lund University

Author

Messi, F., Perrey, H., Fissum, K., Akkawi, M., Jebali, R. Al, Annand, J. R. M., Bentley, P., Boyd, L., Cooper-Jensen, C. P., DiJulio, D. D., Freita-Ramos, J., Hall-Wilton, R., Huusko, A., Ilves, T., Issa, F., Jalgén, A., Kanaki, K., Karnickis, E., Khaplanov, A., Koufigar, S., Maulerova, V., Mauri, G., Mauritzson, N., Pei, W., Piscitelli, F., Rofors, E., Scherzinger, J., Söderhielm, H., Söderström, D., and Stefanescu, I.

Subjects
Physics - Instrumentation and Detectors
Abstract

Over the last decades, the field of thermal neutron detection has overwhelmingly employed He-3-based technologies. The He-3 crisis together with the forthcoming establishment of the European Spallation Source have necessitated the development of new technologies for neutron detection. Today, several promising He-3-free candidates are under detailed study and need to be validated. This validation process is in general long and expensive. The study of detector prototypes using neutron-emitting radioactive sources is a cost-effective solution, especially for preliminary investigations. That said, neutron-emitting sources have the general disadvantage of broad, structured, emitted-neutron energy ranges. Further, the emitted neutrons often compete with unwanted backgrounds of gamma-rays, alpha-particles, and fission-fragments. By blending experimental infrastructure such as shielding to provide particle beams with neutron-detection techniques such as tagging, disadvantages may be converted into advantages. In particular, a technique known as tagging involves exploiting the mixed-field generally associated with a neutron-emitting source to determine neutron time-of-flight and thus energy on an event-by-event basis. This allows for the definition of low-cost, precision neutron beams. The Source-Testing Facility, located at Lund University in Sweden and operated by the SONNIG Group of the Division of Nuclear Physics, was developed for just such low-cost studies. Precision tagged-neutron beams derived from radioactive sources are available around-the-clock for advanced detector diagnostic studies. Neutron measurements performed at the Source Testing Facility are thus cost-effective and have a very low barrier for entry. In this paper, we present an overview of the project., Comment: IAEA Technical Meeting on Modern Neutron Detection (F1-TM-55243)

Published
2017

23. Neutron activation and prompt gamma intensity in Ar/CO$_{2}$-filled neutron detectors at the European Spallation Source

Author

Dian, E., Kanaki, K., Hall-Wilton, R. J., Zagyvai, P., and Czifrus, Sz.

Subjects
Physics - Instrumentation and Detectors
Abstract

Monte Carlo simulations using MCNP6.1 were performed to study the effect of neutron activation in Ar/CO$_{2}$ neutron detector counting gas. A general MCNP model was built and validated with simple analytical calculations. Simulations and calculations agree that only the $^{40}$Ar activation can have a considerable effect. It was shown that neither the prompt gamma intensity from the $^{40}$Ar neutron capture nor the produced $^{41}$Ar activity have an impact in terms of gamma dose rate around the detector and background level., Comment: 38 pages, LaTeX; formal changes: minor restructuring of Section 1 and 2; new references added, typos corrected; Figure 2 slightly modified for better visibility

Published
2017

25. The light-yield response of a NE-213 liquid-scintillator detector measured using 2 -- 6 MeV tagged neutrons

Author

Scherzinger, J., Jebali, R. Al, Annand, J. R. M., Fissum, K. G., Hall-Wilton, R., Kanaki, K., Lundin, M., Nilsson, B., Perrey, H., Rosborg, A., and Svensson, H.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

The response of a NE-213 liquid-scintillator detector has been measured using tagged neutrons from 2--6 MeV originating from an Am/Be neutron source. The neutron energies were determined using the time-of-flight technique. Pulse-shape discrimination was employed to discern between gamma-rays and neutrons. The behavior of both the fast (35 ns) and the combined fast and slow (475 ns) components of the neutron scintillation-light pulses were studied. Three different prescriptions were used to relate the neutron maximum energy-transfer edges to the corresponding recoil-proton scintillation-light yields, and the results were compared to simulations. Parametrizations which predict the fast or total light yield of the scintillation pulses were also tested. Our results agree with both existing data and existing parametrizations. We observe a clear sensitivity to the portion and length of the neutron scintillation-light pulse considered., Comment: 10 pages, 7 figures, to be submitted to Nucl. Instr. and Meth. in Phys. Res. A, Referee comments addressed

Published
2016
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26. Response of a Li-glass/multi-anode photomultiplier detector to collimated thermal-neutron beams

Author

Rofors, E., Mauritzson, N., Perrey, H., Al Jebali, R., Annand, J.R.M., Boyd, L., Christensen, M.J., Clemens, U., Desert, S., Engels, R., Fissum, K.G., Frielinghaus, H., Gheorghe, C., Hall-Wilton, R., Jaksch, S., Kanaki, K., Kazi, S., Kemmerling, G., Llamas Jansa, I., Maulerova, V., Montgomery, R., Richter, T., Scherzinger, J., Seitz, B., and Shetty, M.

Published
2021
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28. Time- and energy-resolved effects in the boron-10 based multi-grid and helium-3 based thermal neutron detectors

Author

Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I., Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., Ruette, N. de, Freita Ramos, J., Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Lopez Higuera, I., Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., Xiong, W., Backis, A., Khaplanov, A., Al Jebali, R., Ammer, R., Apostolidis, I., Birch, J., Lai, C. C., Deen, P. P., Etxegarai, M., Ruette, N. de, Freita Ramos, J., Förster, D. F., Haettner, E., Hall-Wilton, R., Hamilton, D., Höglund, C., Kadletz, P. M., Kanaki, K., Karnickis, E., Kirstein, O., Kolya, S., Kraujalyte, Z., Laloni, A., Livingston, K., Löhman, O., Maulerova, V., Mauritzon, N., Müller, F., Lopez Higuera, I., Richter, T., Robinson, L., Roth, R., Shetty, M., Taylor, J., Woracek, R., and Xiong, W.

Abstract

The boron-10 based multi-grid detector is being developed as an alternative to helium-3 based neutron detectors. At the European Spallation Source, the detector will be used for time-of-flight neutron spectroscopy at cold to thermal neutron energies. The objective of this work is to investigate fine time- and energy-resolved effects of the Multi-Grid detector, down to a few µeV, while comparing it to the performance of a typical helium-3 tube. Furthermore, it is to characterize differences between the detector technologies in terms of internal scattering, as well as the time reconstruction of ∼ µs short neutron pulses. The data were taken at the Helmholtz Zentrum Berlin, where the Multi-Grid detector and a helium-3 tube were installed at the ESS test beamline, V20. Using a Fermi-chopper, the neutron beam of the reactor was chopped into a few tens of µs wide pulses before reaching the detector, located a few tens of cm downstream. The data of the measurements show an agreement between the derived and calculated neutron detection efficiency curve. The data also provide fine details on the effect of internal scattering, and how it can be reduced. For the first time, the chopper resolution was comparable to the timing resolution of the Multi-Grid detector. This allowed a detailed study of time- and energy resolved effects, as well as a comparison with a typical helium-3 tube.

Published
2024

29. A First Comparison of the responses of a He4-based fast-neutron detector and a NE-213 liquid-scintillator reference detector

Author

Jebali, R., Scherzinger, J., Annand, J. R. M., Chandra, R., Davatz, G., Fissum, K. G., Friederich, H., Gendotti, U., Hall-Wilton, R., Håkansson, E., Kanaki, K., Lundin, M., Murer, D., Nilsson, B., Rosborg, A., and Svensson, H.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

A first comparison has been made between the pulse-shape discrimination characteristics of a novel $^{4}$He-based pressurized scintillation detector and a NE-213 liquid-scintillator reference detector using an Am/Be mixed-field neutron and gamma-ray source and a high-resolution scintillation-pulse digitizer. In particular, the capabilities of the two fast neutron detectors to discriminate between neutrons and gamma-rays were investigated. The NE-213 liquid-scintillator reference cell produced a wide range of scintillation-light yields in response to the gamma-ray field of the source. In stark contrast, due to the size and pressure of the $^{4}$He gas volume, the $^{4}$He-based detector registered a maximum scintillation-light yield of 750~keV$_{ee}$ to the same gamma-ray field. Pulse-shape discrimination for particles with scintillation-light yields of more than 750~keV$_{ee}$ was excellent in the case of the $^{4}$He-based detector. Above 750~keV$_{ee}$ its signal was unambiguously neutron, enabling particle identification based entirely upon the amount of scintillation light produced., Comment: 23 pages, 7 figures, Nuclear Instruments and Methods in Physics Research Section A review addressed

Published
2015
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30. The instrument suite of the European Spallation Source

Author

Andersen, K.H., Argyriou, D.N, Jackson, A.J., Houston, J., Henry, P.F., Deen, P.P., Toft-Petersen, R., Beran, P., Strobl, M., Arnold, T., Wacklin-Knecht, H., Tsapatsaris, N., Oksanen, E., Woracek, R., Schweika, W., Mannix, D., Hiess, A., Kennedy, S., Kirstein, O., Petersson Årsköld, S., Taylor, J., Hagen, M.E., Laszlo, G., Kanaki, K., Piscitelli, F., Khaplanov, A., Stefanescu, I., Kittelmann, Th., Pfeiffer, D., Hall-Wilton, R., Lopez, C.I., Aprigliano, G., Whitelegg, L., Moreira, F.Y., Olsson, M., Bordallo, H.N., Martín-Rodríguez, D., Schneider, H., Sharp, M., Hartl, M., Nagy, G., Ansell, S., Pullen, S., Vickery, A., Fedrigo, A., Mezei, F., Arai, M., Heenan, R.K., Halcrow, W., Turner, D., Raspino, D., Orszulik, A., Cooper, J., Webb, N., Galsworthy, P., Nightingale, J., Langridge, S., Elmer, J., Frielinghaus, H., Hanslik, R., Gussen, A., Jaksch, S., Engels, R., Kozielewski, T., Butterweck, S., Feygenson, M., Harbott, P., Poqué, A., Schwaab, A., Lieutenant, K., Violini, N., Voigt, J., Brückel, T., Koenen, M., Kämmerling, H., Babcock, E., Salhi, Z., Wischnewski, A., Heynen, A., Désert, S., Jestin, J., Porcher, F., Fabrèges, X., Fabrèges, G., Annighöfer, B., Klimko, S., Dupont, Th., Robillard, Th., Goukassov, A., Longeville, S., Alba-Simionesco, Ch., Bourges, Ph., Guyon Le Bouffy, J., Lavie, P., Rodrigues, S., Calzada, E., Lerche, M., Schillinger, B., Schmakat, Ph., Schulz, M., Seifert, M., Lohstroh, W., Petry, W., Neuhaus, J., Loaiza, L., Tartaglione, A., Glavic, A., Schütz, S., Stahn, J., Lehmann, E., Morgano, M., Schefer, J., Filges, U., Klauser, Ch., Niedermayer, Ch., Fenske, J., Nowak, G., Rouijaa, M., Siemers, D.J., Kiehn, R., Müller, M., Carlsen, H., Udby, L., Lefmann, K., Birk, J.O., Holm-Dahlin, S., Bertelsen, M., Hansen, U. Bengaard, Olsen, M.A., Christensen, M., Iversen, K., Christensen, N.B., Rønnow, H.M., Freeman, P.G., Hauback, B.C., Kolevatov, R., Llamas-Jansa, I., Orecchini, A., Sacchetti, F., Petrillo, C., Paciaroni, A., Tozzi, P., Zanatta, M., Luna, P., Herranz, I., del Moral, O.G., Huerta, M., Magán, M., Mosconi, M., Abad, E., Aguilar, J., Stepanyan, S., Bakedano, G., Vivanco, R., Bustinduy, I., Sordo, F., Martínez, J.L., Lechner, R.E., Villacorta, F.J., Šaroun, J., Lukáš, P., Markó, M., Zanetti, M., Bellissima, S., del Rosso, L., Masi, F., Bovo, C., Chowdhury, M., De Bonis, A., Di Fresco, L., Scatigno, C., Parker, S.F., Fernandez-Alonso, F., Colognesi, D., Senesi, R., Andreani, C., Gorini, G., Scionti, G., and Schreyer, A.

Published
2020
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31. Tagging fast neutrons from an 241Am/9Be source

Author

Scherzinger, J., Annand, J. R. M., Davatz, G., Fissum, K. G., Gendotti, U., Hall-Wilton, R., Rosborg, A., Håkansson, E., Jebali, R., Kanaki, K., Lundin, M., Nilsson, B., and Svensson, H.

Subjects
Physics - Instrumentation and Detectors, Nuclear Experiment
Abstract

We report on an investigation of the fast-neutron spectrum emitted by 241Am/9Be. Well-understood shielding, coincidence, and time-of-flight measurement techniques are employed to produce a continuous, polychromatic, energy-tagged neutron beam., Comment: 17 pages, 7 figures, submitted to Journal of Applied Radiation and Isotopes

Published
2014
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32. pK+\Lambda final state: towards the extraction of the ppK- contribution

Author

Fabbietti, L., Agakishiev, G., Balanda, A., Belver, D., Belyaev, A. V., Berger-Chen, J-C, Blanco, A., Böhmer, M., Boyard, J. L., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Dohrmann, F., Dybczak, A., Epple, E., Eberl, T., Fateev, O. V., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzon, J. A., Gernhäuser, R., Gilardi, C., Golubeva, M., Gonzalez-Diaz, D., Guber, F., Gumberidze, M., Heinz, T., Hennino, T., Holzmann, R., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krasa, A., Krizek, F., Krücken, R., Kuc, H., Kühn, W., Kugler, A., Kurepin, A., Lalik, R., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Moriniere, E., Mousa, J., Müntz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Rustamov, A., Sadovsky, A., Salabura, P., Schmah, A., Schwab, E., Siebenson, J., Sobolev, Yu. G., Spataro, A. Solaguren-Beascoa Negre S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Weber, M., Wendisch, C., Wüstenfel, J., Yurevich, S., and Zanevsky, Y. V.

Subjects
Nuclear Experiment
Abstract

The reaction p(@3.5\,GeV)+p -> p+\Lambda + K^+ can be studied to search for the existence of kaonic bound states like ppK^- leading to this final state. This effort has been motivated by the assumption that in p+p collisions the \Lambda(1405) resonance can act as a doorway to the formation of the kaonic bound states. The status of this analysis within the HADES collaboration, with particular emphasis on the comparison to simulations, is shown in this work and the deviation method utilized by the DISTO collaboration in a similar analysis is discussed. The outcome suggests the employment of a partial wave analysis to disentangle the different contributions to the measured pK^+\Lambda final state., Comment: 9 pages, 6 figures, proceeding of the HYP2012 conference Nucl. Phys. A (2013)

Published
2013
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33. Inclusive J/psi production in pp collisions at sqrt(s) = 2.76 TeV

Author

ALICE Collaboration, Abelev, B., Adam, J., Adamova, D., Adare, A. M., Aggarwal, M. M., Rinella, G. Aglieri, Agocs, A. G., Agostinelli, A., Salazar, S. Aguilar, Ahammed, Z., Masoodi, A. Ahmad, Ahmad, N., Ahn, S. U., Akindinov, A., Aleksandrov, D., Alessandro, B., Molina, R. Alfaro, Alici, A., Alkin, A., Avina, E. Almaraz, Alme, J., Alt, T., Altini, V., Altinpinar, S., Altsybeev, I., Andrei, C., Andronic, A., Anguelov, V., Anielski, J., Anson, C., Anticic, T., Antinori, F., Antonioli, P., Aphecetche, L., Appelshauser, H., Arbor, N., Arcelli, S., Arend, A., Armesto, N., Arnaldi, R., Aronsson, T., Arsene, I. C., Arslandok, M., Asryan, A., Augustinus, A., Averbeck, R., Awes, T. C., Aysto, J., Azmi, M. D., Bach, M., Badala, A., Baek, Y. W., Bailhache, R., Bala, R., Ferroli, R. Baldini, Baldisseri, A., Baldit, A., Pedrosa, F. Baltasar Dos Santos, Ban, J., Baral, R. C., Barbera, R., Barile, F., Barnafoldi, G. G., Barnby, L. S., Barret, V., Bartke, J., Basile, M., Bastid, N., Bathen, B., Batigne, G., Batyunya, B., Baumann, C., Bearden, I. G., Beck, H., Belikov, I., Bellini, F., Bellwied, R., Belmont-Moreno, E., Bencedi, G., Beole, S., Berceanu, I., Bercuci, A., Berdnikov, Y., Berenyi, D., Bergmann, C., Berzano, D., Betev, L., Bhasin, A., Bhati, A. K., Bianchi, L., Bianchi, N., Bianchin, C., Bielcik, J., Bielcikova, J., Bjelogrlic, S., Blanco, F., Blau, D., Blume, C., Boccioli, M., Bock, N., Bogdanov, A., Boggild, H., Bogolyubsky, M., Boldizsar, L., Bombara, M., Book, J., Borel, H., Borissov, A., Bose, S., Bossu, F., Botje, M., Bottger, S., Boyer, B., Braidot, E., Braun-Munzinger, P., Bregant, M., Breitner, T., Browning, T. A., Broz, M., Brun, R., Bruna, E., Bruno, G. E., Budnikov, D., Buesching, H., Bufalino, S., Bugaiev, K., Busch, O., Buthelezi, Z., Orduna, D. Caballero, Caffarri, D., Cai, X., Caines, H., Villar, E. Calvo, Camerini, P., Roman, V. Canoa, Romeo, G. Cara, Carena, W., Carena, F., Filho, N. Carlin, Carminati, F., Montoya, C. A. Carrillo, Diaz, A. Casanova, Castellanos, J. Castillo, Hernandez, J. F. Castillo, Casula, E. A. R., Catanescu, V., Cavicchioli, C., Cepila, J., Cerello, P., Chang, B., Chapeland, S., Charvet, J. L., Chattopadhyay, S., Chawla, I., Cherney, M., Cheshkov, C., Cheynis, B., Chiavassa, E., Barroso, V. Chibante, Chinellato, D. D., Chochula, P., Chojnacki, M., Christakoglou, P., Christensen, C. H., Christiansen, P., Chujo, T., Chung, S. U., Cicalo, C., Cifarelli, L., Cindolo, F., Cleymans, J., Coccetti, F., Colamaria, F., Colella, D., Balbastre, G. Conesa, del Valle, Z. Conesa, Constantin, P., Contin, G., Contreras, J. G., Cormier, T. M., Morales, Y. Corrales, Cortese, P., Maldonado, I. Cortes, Cosentino, M. R., Costa, F., Cotallo, M. E., Crescio, E., Crochet, P., Alaniz, E. Cruz, Cuautle, E., Cunqueiro, L., Dainese, A., Dalsgaard, H. H., Danu, A., Das, K., Das, I., Das, D., Dash, A., Dash, S., De, S., de Barros, G. O. V., De Caro, A., de Cataldo, G., de Cuveland, J., De Falco, A., De Gruttola, D., Delagrange, H., Sanchez, E. Del Castillo, Deloff, A., Demanov, V., De Marco, N., Denes, E., De Pasquale, S., Deppman, A., Erasmo, G. D, de Rooij, R., Corchero, M. A. Diaz, Di Bari, D., Dietel, T., Di Giglio, C., Di Liberto, S., Di Mauro, A., Di Nezza, P., Divia, R., Djuvsland, O., Dobrin, A., Dobrowolski, T., Dominguez, I., Donigus, B., Dordic, O., Driga, O., Dubey, A. K., Ducroux, L., Dupieux, P., Majumdar, A. K. Dutta, Majumdar, M. R. Dutta, Elia, D., Emschermann, D., Engel, H., Erdal, H. A., Espagnon, B., Estienne, M., Esumi, S., Evans, D., Eyyubova, G., Fabris, D., Faivre, J., Falchieri, D., Fantoni, A., Fasel, M., Fearick, R., Fedunov, A., Fehlker, D., Feldkamp, L., Felea, D., Feofilov, G., Tellez, A. Fernandez, Ferreiro, E. G., Ferretti, A., Ferretti, R., Figiel, J., Figueredo, M. A. S., Filchagin, S., Finogeev, D., Fionda, F. M., Fiore, E. M., Floris, M., Foertsch, S., Foka, P., Fokin, S., Fragiacomo, E., Fragkiadakis, M., Frankenfeld, U., Fuchs, U., Furget, C., Girard, M. Fusco, Gaardhoje, J. J., Gagliardi, M., Gago, A., Gallio, M., Gangadharan, D. R., Ganoti, P., Garabatos, C., Garcia-Solis, E., Garishvili, I., Gerhard, J., Germain, M., Geuna, C., Gheata, A., Gheata, M., Ghidini, B., Ghosh, P., Gianotti, P., Girard, M. R., Giubellino, P., Gladysz-Dziadus, E., Glassel, P., Gomez, R., Gonzalez-Trueba, L. H., Gonzalez-Zamora, P., Gorbunov, S., Goswami, A., Gotovac, S., Grabski, V., Graczykowski, L. K., Grajcarek, R., Grelli, A., Grigoras, A., Grigoras, C., Grigoriev, V., Grigoryan, A., Grigoryan, S., Grinyov, B., Grion, N., Gros, P., Grosse-Oetringhaus, J. F., Grossiord, J. -Y., Grosso, R., Guber, F., Guernane, R., Gutierrez, C. Guerra, Guerzoni, B., Guilbaud, M., Gulbrandsen, K., Gunji, T., Gupta, A., Gupta, R., Gutbrod, H., Haaland, O., Hadjidakis, C., Haiduc, M., Hamagaki, H., Hamar, G., Han, B. H., Hanratty, L. D., Hansen, A., Harmanova, Z., Harris, J. W., Hartig, M., Hasegan, D., Hatzifotiadou, D., Hayrapetyan, A., Heckel, S. T., Heide, M., Helstrup, H., Herghelegiu, A., Corral, G. Herrera, Herrmann, N., Hetland, K. F., Hicks, B., Hille, P. T., Hippolyte, B., Horaguchi, T., Hori, Y., Hristov, P., Hrivnacova, I., Huang, M., Huber, S., Humanic, T. J., Hwang, D. S., Ichou, R., Ilkaev, R., Ilkiv, I., Inaba, M., Incani, E., Innocenti, G. M., Innocenti, P. G., Ippolitov, M., Irfan, M., Ivan, C., Ivanov, V., Ivanov, A., Ivanov, M., Ivanytskyi, O., Jacholkowski, A., Jacobs, P. M., Jancurova, L., Jang, H. J., Jangal, S., Janik, M. A., Janik, R., Jayarathna, P. H. S. Y., Jena, S., Bustamante, R. T. Jimenez, Jirden, L., Jones, P. G., Jung, H., Jusko, A., Kaidalov, A. B., Kakoyan, V., Kalcher, S., Kalinak, P., Kalisky, M., Kalliokoski, T., Kalweit, A., Kanaki, K., Kang, J. H., Kaplin, V., Uysal, A. Karasu, Karavichev, O., Karavicheva, T., Karpechev, E., Kazantsev, A., Kebschull, U., Keidel, R., Khan, M. M., Khan, S. A., Khan, P., Khanzadeev, A., Kharlov, Y., Kileng, B., Kim, M., Kim, J. S., Kim, D. J., Kim, T., Kim, B., Kim, S., Kim, S. H., Kim, D. W., Kim, J. H., Kirsch, S., Kisel, I., Kiselev, S., Kisiel, A., Klay, J. L., Klein, J., Klein-Bosing, C., Kliemant, M., Kluge, A., Knichel, M. L., Knospe, A. G., Koch, K., Kohler, M. K., Kolojvari, A., Kondratiev, V., Kondratyeva, N., Konevskikh, A., Korneev, A., Don, C. Kottachchi Kankanamge, Kour, R., Kowalski, M., Kox, S., Meethaleveedu, G. Koyithatta, Kral, J., Kralik, I., Kramer, F., Kraus, I., Krawutschke, T., Krelina, M., Kretz, M., Krivda, M., Krizek, F., Krus, M., Kryshen, E., Krzewicki, M., Kucheriaev, Y., Kuhn, C., Kuijer, P. G., Kurashvili, P., Kurepin, A., Kurepin, A. B., Kuryakin, A., Kushpil, S., Kushpil, V., Kvaerno, H., Kweon, M. J., Kwon, Y., de Guevara, P. Ladron, Lakomov, I., Langoy, R., Lara, C., Lardeux, A., La Rocca, P., Lazzeroni, C., Lea, R., Bornec, Y. Le, Lee, S. C., Lee, K. S., Lefevre, F., Lehnert, J., Leistam, L., Lenhardt, M., Lenti, V., Leon, H., Monzon, I. Leon, Vargas, H. Leon, Levai, P., Lien, J., Lietava, R., Lindal, S., Lindenstruth, V., Lippmann, C., Lisa, M. A., Liu, L., Loenne, P. I., Loggins, V. R., Loginov, V., Lohn, S., Lohner, D., Loizides, C., Loo, K. K., Lopez, X., Torres, E. Lopez, Lovhoiden, G., Lu, X. -G., Luettig, P., Lunardon, M., Luo, J., Luparello, G., Luquin, L., Luzzi, C., Ma, K., Ma, R., Madagodahettige-Don, D. M., Maevskaya, A., Mager, M., Mahapatra, D. P., Maire, A., Malaev, M., Cervantes, I. Maldonado, Malinina, L., Mal'Kevich, D., Malzacher, P., Mamonov, A., Manceau, L., Mangotra, L., Manko, V., Manso, F., Manzari, V., Mao, Y., Marchisone, M., Mares, J., Margagliotti, G. V., Margotti, A., Marin, A., Tobon, C. A. Marin, Markert, C., Martashvili, I., Martinengo, P., Martinez, M. I., Davalos, A. Martinez, Garcia, G. Martinez, Martynov, Y., Mas, A., Masciocchi, S., Masera, M., Masoni, A., Massacrier, L., Mastromarco, M., Mastroserio, A., Matthews, Z. L., Matyja, A., Mayani, D., Mayer, C., Mazer, J., Mazzoni, M. A., Meddi, F., Menchaca-Rocha, A., Perez, J. Mercado, Meres, M., Miake, Y., Milano, L., Milosevic, J., Mischke, A., Mishra, A. N., Miskowiec, D., Mitu, C., Mlynarz, J., Mohanty, A. K., Mohanty, B., Molnar, L., Zetina, L. Montano, Monteno, M., Montes, E., Moon, T., Morando, M., De Godoy, D. A. Moreira, Moretto, S., Morsch, A., Muccifora, V., Mudnic, E., Muhuri, S., Muller, H., Munhoz, M. G., Musa, L., Musso, A., Nandi, B. K., Nania, R., Nappi, E., Nattrass, C., Naumov, N. P., Navin, S., Nayak, T. K., Nazarenko, S., Nazarov, G., Nedosekin, A., Nicassio, M., Nielsen, B. S., Niida, T., Nikolaev, S., Nikolic, V., Nikulin, V., Nikulin, S., Nilsen, B. S., Nilsson, M. S., Noferini, F., Nomokonov, P., Nooren, G., Novitzky, N., Nyanin, A., Nyatha, A., Nygaard, C., Nystrand, J., Ochirov, A., Oeschler, H., Oh, S. K., Oh, S., Oleniacz, J., Oppedisano, C., Velasquez, A. Ortiz, Ortona, G., Oskarsson, A., Ostrowski, P., Otwinowski, J., Ovrebekk, G., Oyama, K., Ozawa, K., Pachmayer, Y., Pachr, M., Padilla, F., Pagano, P., Paic, G., Painke, F., Pajares, C., Pal, S. K., Pal, S., Palaha, A., Palmeri, A., Papikyan, V., Pappalardo, G. S., Park, W. J., Passfeld, A., Pastircak, B., Patalakha, D. I., Paticchio, V., Pavlinov, A., Pawlak, T., Peitzmann, T., Filho, E. Pereira De Oliveira, Peresunko, D., Lara, C. E. Perez, Lezama, E. Perez, Perini, D., Perrino, D., Peryt, W., Pesci, A., Peskov, V., Pestov, Y., Petracek, V., Petran, M., Petris, M., Petrov, P., Petrovici, M., Petta, C., Piano, S., Piccotti, A., Pikna, M., Pillot, P., Pinazza, O., Pinsky, L., Pitz, N., Piuz, F., Piyarathna, D. B., Ploskon, M., Pluta, J., Pocheptsov, T., Pochybova, S., Podesta-Lerma, P. L. M., Poghosyan, M. G., Polak, K., Polichtchouk, B., Pop, A., Porteboeuf-Houssais, S., Pospisil, V., Potukuchi, B., Prasad, S. K., Preghenella, R., Prino, F., Pruneau, C. A., Pshenichnov, I., Puchagin, S., Puddu, G., Teixido, J. Pujol, Pulvirenti, A., Punin, V., Putis, M., Putschke, J., Quercigh, E., Qvigstad, H., Rachevski, A., Rademakers, A., Radomski, S., Raiha, T. S., Rak, J., Rakotozafindrabe, A., Ramello, L., Reyes, A. Ramirez, Raniwala, S., Raniwala, R., Rasanen, S. S., Rascanu, B. T., Rathee, D., Read, K. F., Real, J. S., Redlich, K., Reichelt, P., Reicher, M., Renfordt, R., Reolon, A. R., Reshetin, A., Rettig, F., Revol, J. -P., Reygers, K., Riccati, L., Ricci, R. A., Richert, T., Richter, M., Riedler, P., Riegler, W., Riggi, F., Cahuantzi, M. Rodriguez, Roed, K., Rohr, D., Rohrich, D., Romita, R., Ronchetti, F., Rosnet, P., Rossegger, S., Rossi, A., Roukoutakis, F., Roy, C., Roy, P., Montero, A. J. Rubio, Rui, R., Ryabinkin, E., Rybicki, A., Sadovsky, S., Safarik, K., Sahoo, R., Sahu, P. K., Saini, J., Sakaguchi, H., Sakai, S., Sakata, D., Salgado, C. A., Salzwedel, J., Sambyal, S., Samsonov, V., Castro, X. Sanchez, Sandor, L., Sandoval, A., Sano, S., Sano, M., Santo, R., Santoro, R., Sarkamo, J., Scapparone, E., Scarlassara, F., Scharenberg, R. P., Schiaua, C., Schicker, R., Schmidt, H. R., Schmidt, C., Schreiner, S., Schuchmann, S., Schukraft, J., Schutz, Y., Schwarz, K., Schweda, K., Scioli, G., Scomparin, E., Scott, P. A., Scott, R., Segato, G., Selyuzhenkov, I., Senyukov, S., Seo, J., Serci, S., Serradilla, E., Sevcenco, A., Sgura, I., Shabetai, A., Shabratova, G., Shahoyan, R., Sharma, N., Sharma, S., Shigaki, K., Shimomura, M., Shtejer, K., Sibiriak, Y., Siciliano, M., Sicking, E., Siddhanta, S., Siemiarczuk, T., Silvermyr, D., Silvestre, C., Simonetti, G., Singaraju, R., Singh, R., Singha, S., Sinha, T., Sinha, B. C., Sitar, B., Sitta, M., Skaali, T. B., Skjerdal, K., Smakal, R., Smirnov, N., Snellings, R. J. M., Sogaard, C., Soltz, R., Son, H., Song, M., Song, J., Soos, C., Soramel, F., Sputowska, I., Spyropoulou-Stassinaki, M., Srivastava, B. K., Stachel, J., Stan, I., Stefanek, G., Stefanini, G., Steinbeck, T., Steinpreis, M., Stenlund, E., Steyn, G., Stocco, D., Stolpovskiy, M., Strabykin, K., Strmen, P., Suaide, A. A. P., Vasquez, M. A. Subieta, Sugitate, T., Suire, C., Sukhorukov, M., Sultanov, R., Sumbera, M., Susa, T., de Toledo, A. Szanto, Szarka, I., Szostak, A., Tagridis, C., Takahashi, J., Takaki, J. D. Tapia, Tauro, A., Munoz, G. Tejeda, Telesca, A., Terrevoli, C., Thader, J., Thomas, D., Tieulent, R., Timmins, A. R., Tlusty, D., Toia, A., Torii, H., Toscano, L., Tosello, F., Truesdale, D., Trzaska, W. H., Tsuji, T., Tumkin, A., Turrisi, R., Tveter, T. S., Ulery, J., Ullaland, K., Ulrich, J., Uras, A., Urban, J., Urciuoli, G. M., Usai, G. L., Vajzer, M., Vala, M., Palomo, L. Valencia, Vallero, S., van der Kolk, N., Vyvre, P. Vande, van Leeuwen, M., Vannucci, L., Vargas, A., Varma, R., Vasileiou, M., Vasiliev, A., Vechernin, V., Veldhoen, M., Venaruzzo, M., Vercellin, E., Vergara, S., Vernekohl, D. C., Vernet, R., Verweij, M., Vickovic, L., Viesti, G., Vikhlyantsev, O., Vilakazi, Z., Baillie, O. Villalobos, Vinogradov, A., Vinogradov, Y., Vinogradov, L., Virgili, T., Viyogi, Y. P., Vodopyanov, A., Voloshin, S., Voloshin, K., Volpe, G., von Haller, B., Vranic, D., Vrlakova, J., Vulpescu, B., Vyushin, A., Wagner, B., Wagner, V., Wan, R., Wang, Y., Wang, D., Wang, M., Watanabe, K., Wessels, J. P., Westerhoff, U., Wiechula, J., Wikne, J., Wilde, M., Wilk, G., Wilk, A., Williams, M. C. S., Windelband, B., Karampatsos, L. Xaplanteris, Yang, H., Yang, S., Yasnopolskiy, S., Yi, J., Yin, Z., Yokoyama, H., Yoo, I. -K., Yoon, J., Yu, W., Yuan, X., Yushmanov, I., Zach, C., Zampolli, C., Zaporozhets, S., Zarochentsev, A., Zavada, P., Zaviyalov, N., Zbroszczyk, H., Zelnicek, P., Zgura, I. S., Zhalov, M., Zhang, X., Zhou, D., Zhou, Y., Zhou, F., Zhu, X., Zichichi, A., Zimmermann, A., Zinovjev, G., Zoccarato, Y., and Zynovyev, M.

Subjects
High Energy Physics - Experiment
Abstract

The ALICE Collaboration has measured inclusive J/psi production in pp collisions at a center of mass energy sqrt(s)=2.76 TeV at the LHC. The results presented in this Letter refer to the rapidity ranges |y|<0.9 and 2.5

Published
2012
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34. Inclusive dielectron production in proton-proton collisions at 2.2 GeV beam energy

Author

Agakishiev, G., Alvarez-Pol, H., Balanda, A., Bassini, R., Böhmer, M., Bokemeye, H., Boyard, J. L., Cabanelas, P., Chernenko, S., Christ, T., Destefanis, M., Dohrmann, F., Dybczak, A., Eberl, T., Fabbietti, L., Fateev, O., Finocchiaro, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gilardi, C., Golubeva, M., González-Díaz, D., Guber, F., Gumberidze, M., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krizek, F., Kühn, W., Kugler, A., Kurepin, A., Lang, S., Lapidus, K., Liu, T., Maier, L., Markert, J., Metag, V., Michalska, B., Morinière, E., Mousa, J., Münch, M., Müntz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Pechenov, V., Pechenova, O., Cavalcanti, T. Perez, Pietraszko, J., Pospisil, V., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Sánchez, M., Schmah, A., Schwab, E., Sobolev, Yu. G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Tarantola, A., Teilab, K., Tlusty, P., Toia, A., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Yurevich, S., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

Data on inclusive dielectron production are presented for the reaction p+p at 2.2 GeV measured with the High Acceptance DiElectron Spectrometer (HADES). Our results supplement data obtained earlier in this bombarding energy regime by DLS and HADES. The comparison with the 2.09 GeV DLS data is discussed. The reconstructed e+e- distributions are confronted with simulated pair cocktails, revealing an excess yield at invariant masses around 0.5 GeV/c2. Inclusive cross sections of neutral pion and eta production are obtained.

Published
2012
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35. Study of exclusive one-pion and one-eta production using hadron and dielectron channels in pp reactions at kinetic beam energies of 1.25 GeV and 2.2 GeV with HADES

Author

HADES Collaboration, Agakishiev, G., Alvarez-Pol, H., Balanda, A., Bassini, R., Böhmer, M., Bokemeyer, H., Boyard, J. L., Cabanelas, P., Chernenko, S., Christ, T., Destefanis, M., Dohrmann, F., Dybczak, A., Eberl, T., Fabbietti, L., Fateev, O., Finocchiaro, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gilardi, C., Golubeva, M., González-Díaz, D., Guber, F., Gumberidze, M., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krizek, F., Kühn, W., Kugler, A., Kurepin, A., Lang, S., Lapidus, K., Liu, T., Maier, L., Markert, J., Metag, V., Michalska, B., Morinière, E., Mousa, J., Münch, M., Müntz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Pechenov, V., Pechenova, O., Cavalcanti, T. Pérez, Pietraszko, J., Pospísil, V., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Sánchez, M., Schmah, A., Schwab, E., Sobolev, Yu. G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Tarantola, A., Teilab, K., Tlusty, P., Toia, A., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Yurevich, S., Zanevsky, Y., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

We present measurements of exclusive \pi^{+,0} and \eta\ production in pp reactions at 1.25 GeV and 2.2 GeV beam kinetic energy in hadron and dielectron channels. In the case of \pi^+ and \pi^0, high-statistics invariant-mass and angular distributions are obtained within the HADES acceptance as well as acceptance corrected distributions, which are compared to a resonance model. The sensitivity of the data to the yield and production angular distribution of \Delta(1232) and higher lying baryon resonances is shown, and an improved parameterization is proposed. The extracted cross sections are of special interest in the case of pp \to pp \eta, since controversial data exist at 2.0 GeV; we find \sigma =0.142 \pm 0.022 mb. Using the dielectron channels, the \pi^0 and \eta\ Dalitz decay signals are reconstructed with yields fully consistent with the hadronic channels. The electron invariant masses and acceptance corrected helicity angle distributions are found in good agreement with model predictions., Comment: 22 pages, 18 figures, to be published in EPJA

Published
2012
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36. Production of Sigma{\pm}pi?pK+ in p+p reactions at 3.5 GeV beam energy

Author

Agakishiev, G., Balanda, A., Belver, D., Belyaev, A., Berger-Chen, J. C., Blanco, A., Boehmer, M., Boyard, J. L., Cabanelas, P., Castro, E., Chernenko, S., Destefanis, T. Christ M., Dohrmann, F., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzon, J. A., Gernhäuser, R., Gilardi, C., Golubeva, M., Gonza'lez-Di'az, D., Guber, F., Gumberidze, M., Heinz, T., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kr'asa, A., Krizek, F., Krücken, R., Kuc, H., Kuehn, W., Kugler, A., Kurepin, A., Lalik, R., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Morinie're, E., Mousa, J., Müntz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Rustamov, A., Sadovsky, A., Salabura, P., Schmah, A., Schwab, E., Siebenson, J., Sobolev, Yu. G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Weber, M., Wendisch, C., Wüstenfeld, J., Yurevich, S., and Zanevsky, Y.

Subjects
Nuclear Experiment
Abstract

We study the production of Sigma^+-pi^+-pK^+ particle quartets in p+p reactions at 3.5 GeV kinetic beam energy. The data were taken with the HADES experiment at GSI. This report evaluates the contribution of resonances like Lambda(1405$, Sigma(1385)^0, Lambda(1520), Delta(1232), N^* and K^*0 to the Sigma^+- pi^-+ p K+ final state. The resulting simulation model is compared to the experimental data in several angular distributions and it shows itself as suitable to evaluate the acceptance corrections properly., Comment: 15 pages, 5 figures

Published
2012
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37. Determination of the $\mathbf{\Sigma(1385)^{0}/\Lambda(1405)}$ ratio in p+p collisions at 3.5 GeV

Author

Agakishiev, G., Balanda, A., Belver, D., Belyaev, A. V., Blanco, A., Böhmer, M., Boyard, J. L., Cabanelas, P., Castro, E., Chen, J. C., Chernenko, S., Christ, T., Destefanis, M., Dohrmann, F., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O. V., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gilardi, C., Golubeva, M., González-Díaz, D., Guber, F., Gumberidze, M., Heinz, T., Hennino, T., Holzmann, R., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krása, A., Krizek, F., Krücken, R., Kuc, H., Kühn, W., Kugler, A., Kurepin, A., Lalik, R., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Morinière, E., Mousa, J., Müntz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Rustamov, A., Sadovsky, A., Salabura, P., Schmah, A., Schwab, E., Siebenson, J., Sobolev, Yu. G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Weber, M., Wendisch, C., Wüstenfeld, J., Yurevich, S., and Zanevsky, Y. V.

Subjects
Nuclear Experiment
Abstract

The aim of the present analysis is to determine the relative production cross sections of the $\Lambda$(1405) and $\Sigma(1385)^{0}$ resonances in p+p collisions at E$_{kin}$=3.5 GeV measured with HADES. Upper and lower limits have been determined for the ratio $\sigma_{(\Sigma(1385)^{0}+p+K^{+})}/\sigma_{(\Lambda(1405)+p+K^{+})}=0.76_{-0.26}^{+0.54}$. The knowledge of this ratio is an essential input for the analysis of the decay $\Lambda(1405)\rightarrow\Sigma^{\pm}\pi^{\mp}$, where an unambiguous separation of the $\Lambda$(1405) and $\Sigma(1385)^{0}$ signals is not possible.

Published
2012
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38. Inclusive dielectron spectra in p+p collisions at 3.5 GeV

Author

Agakishiev, G., Balanda, A., Belver, D., Belyaev, A., Blanco, A., Böhmer, M., Boyard, J. L., Cabanelas, P., Castro, E., Chen, J. C., Chernenko, S., Christ, T., Destefanis, M., Dohrmann, F., Dybczak, A., Epple, E., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gilardi, C., Golubeva, M., González-Díaz, D., Guber, F., Gumberidze, M., Heinz, T., Hennino, T., Holzmann, R., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krása, A., Krizek, F., Krücken, R., Kuc, H., Kühn, W., Kugler, A., Kurepin, A., Lalik, R., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Morinière, E., Mousa, J., Müntz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Rustamov, A., Sadovsky, A., Salabura, P., Schmah, A., Schwab, E., Siebenson, J., Sobolev, Yu. G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Weber, M., Wendisch, C., Wüstenfeld, J., Yurevich, S., and Zanevsky, Y.

Subjects
Nuclear Experiment
Abstract

We present the inclusive invariant-mass, transverse momentum and rapidity distributions of dielectrons (e$^{+}$e$^{-}$ pairs) in p+p interactions at 3.5 GeV beam kinetic energy. In the vector-meson mass region, a distinct peak corresponding to direct $\omega$ decays is reconstructed with 2% mass resolution. The data is compared to predictions from three model calculations. Due to the large acceptance of the HADES apparatus for $e^{+}e^{-}$ invariant masses above 0.2 GeV/$c^{2}$ and for transverse pair momenta p$_{t}$ $ <$ 1 GeV/$c$, acceptance corrections are to a large extent model independent. This allows us to extract from dielectron data for the first time at this energy the inclusive production cross sections for light vector mesons. Inclusive production cross sections for $\pi^o$ and $\eta$ mesons are also reported. The obtained results will serve as an important reference for the study of vector meson production in proton-nucleus and heavy-ion collisions. Furthermore, using this data, an improved value for the upper bound of the branching ratio for direct $\eta$ decays into the electron-positron channel is obtained.

Published
2011
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39. Baryonic resonances close to the Kbar-N threshold: the case of Sigma(1385)^+ in pp collisions

Author

Agakishiev, G., Balanda, A., Belver, D., Belyaev, A. V., Blanco, A., Boehmer, M., Boyard, J. L., Cabanelas, P., Castro, E., Chen, J. C., Chernenko, S., Christ, T., Destefanis, M., Dohrmann, F., Dybczak, A., Epple, E., Eberl, T., Fabbietti, L., Fateev, O. V., Finocchiaro, P., Fonte, P., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gilardi, C., Golubeva, M., Gonzalez-Diaz, D., Guber, F., Gumberidze, M., Heinz, T., Hennino, T., Holzmann, R., Iori, I., Ivashkin, A., Jurkovic, M., Kaempfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krasa, A., Krizek, F., Kruecken, R., Kuc, H., Kuehn, W., Kugler, A., Kurepin, A., Lalik, R., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Moriniere, E., Mousa, J., Muentz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Rustamov, A., Sadovsky, A., Salabura, P., Schmah, A., Schwab, E., Siebenson, J., Sobolev, Yu. G., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Weber, M., Wendisch, C., Wuestenfeld, J., Yurevich, S., and Zanevsky, Y. V.

Subjects
Nuclear Experiment
Abstract

We present results of an exclusive measurement of the first excited state of the Sigma hyperon, Sigma(1385)^+, produced in p+p -> Sigma^+ + K^+ + n at 3.5 GeV beam energy. The extracted data allow to study in detail the invariant mass distribution of the Sigma(1385)^+. The mass distribution is well described by a relativistic Breit-Wigner function with a maximum at m_0 = 1383.2 +- 0.9 MeV/c^2 and a width of 40.2 +- 2.1 MeV/c^2. The exclusive production cross-section comes out to be 22.27 +- 0.89 +- 1.56 +3.07 -2.10 mu b. Angular distributions of the Sigma(1385)^+ in different reference frames are found to be compatible with the hypothesis that 33 % of Sigma(1385)^+ result from the decay of an intermediate Delta^{++} resonance., Comment: 12 pages; 12 figures; submitted to PRC

Published
2011
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40. Dielectron production in Ar+KCl collisions at 1.76A GeV

Author

Agakishiev, G., Balanda, A., Belver, D., Belyaev, A., Blanco, A., Böhmer, M., Boyard, J. L., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Dohrmann, F., Dybczak, A., Eberl, T., Epple, E., Fabbbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzon, J. A., Gernhäuser, R., Gilardi, C., Golubeva, M., Gonzalez-Díaz, D., Guber, F., Gumberidze, M., Heinz, T., Hennino, T., Holzmann, R., Huck, P., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krasa, A., Krizek, F., Krücken, R., Kuc, H., Kühn, W., Kugler, A., Kurepin, A., Lang, S., Lange, J. S., Liu, K. Lapidus T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Moriniere, E., Mousa, J., Müntz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Pechenov, V., Pechenova, O., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Schwab, E., Siebenson, J., Sobolev, Yu. G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Weber, M., Wendisch, C., Wisniowski, M., Wüstenfeld, J., Yurevich, S., and Zanevsky, Y.

Subjects
Nuclear Experiment
Abstract

We present results on dielectron production in Ar+KCl collisions at 1.76A GeV. For the first time $\omega$ mesons could be reconstructed in a heavy-ion reaction at a bombarding energy which is well below the production threshold in free nucleon-nucleon collisions. The omega multiplicity has been extracted and compared to the yields of other particles, in particular of the phi meson. At intermediate e+e- invariant masses, we find a strong enhancement of the pair yield over a reference spectrum from elementary nucleon-nucleon reactions suggesting the onset of non-trivial effects of the nuclear medium. Transverse-mass spectra and angular distributions have been reconstructed in three invariant mass bins. In the former unexpectedly large slopes are found for high-mass pairs. The latter, in particular the helicity-angle distributions, are largely consistent with expectations for a pair cocktail dominated at intermediate masses by delta Dalitz decays., Comment: 16 pages, 14 figures, accepted for publication by Phys. Rev. C

Published
2011
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41. Hyperon production in Ar+KCl collisions at 1.76A GeV

Author

Agakishiev, G., Balanda, A., Bannier, B., Bassini, R., Belver, D., Belyaev, A., Blanco, A., Böhmer, M., Boyard, J. L., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Diaz, J., Dohrmann, F., Dybczak, A., Eberl, T., Epple, E., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gil, A., Gilardi, C., Golubeva, M., Gonzalez-Diaz, D., Guber, F., Gumberidze, M., Heilmann, M., Heinz, T., Hennino, T., Holzmann, R., Huck, P., Iori, I., Ivashkin, A., Jurkovic, M., Kaempfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krizek, F., Kruecken, R., Kuehn, W., Kugler, A., Kurepin, A., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Mishra, D., Moriniere, E., Mousa, J., Muentz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Perez-Cavalcanti, T., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Schwab, E., Siebenson, J., Sobolev, Yu. G., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Weber, M., Wendisch, C., Wisniowski, M., Wojcik, T., Wuestenfeld, J., Yurevich, S., Zanevsky, Y., Zhou, P., Zumbruch, P., and Collaboration, HADES

Subjects
Nuclear Experiment, High Energy Physics - Experiment
Abstract

We present transverse momentum spectra, rapidity distribution and multiplicity of Lambda-hyperons measured with the HADES spectrometer in the reaction Ar(1.76A GeV)+KCl. The yield of Xi- is calculated from our previously reported Xi-/(Lambda+Sigma0) ratio and compared to other strange particle multiplicities. Employing a strangeness balance equation the multiplicities of the yet unmeasured charged Sigma hyperons can be estimated. Finally a statistical hadronization model is used to fit the yields of pi-, K+, K0s, K-, phi, Lambda and Xi-. The resulting chemical freeze-out temperature of T=(76+-2) MeV is compared to the measured slope parameters obtained from fits to the transverse mass distributions of the particles.

Published
2010
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42. In-Medium Effects on K0 Mesons in Relativistic Heavy-Ion Collisions

Author

Agakishiev, G., Balanda, A., Bannier, B., Bassini, R., Belver, D., Belyaev, A. V., Blanco, A., Böhmer, M., Boyard, J. L., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Díaz, J., Dohrmann, F., Dybczak, A., Eberl, T., Epple, E., Fabbietti, L., Fateev, O. V., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gil, A., Gilardi, C., Golubeva, M., González-Díaz, D., Guber, F., Heilmann, M., Heinz, T., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krizek, F., Krücken, R., Kühn, W., Kugler, A., Kurepin, A., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Mishra, D., Morinière, E., Mousa, J., Müntz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., PérezCavalcanti, T., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Schwab, E., Sobolev, Yu. G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebac, R., Tsertos, H., Wagner, V., Weber, M., Wisniowski, M., Wojcik, T., Wüstenfel, J., Yurevich, S., Zanevsky, Y. V., Zhou, P., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

We present the transverse momentum spectra and rapidity distributions of $\pi^{-}$ and K$^0_S$ in Ar+KCl reactions at a beam kinetic energy of 1.756 A GeV measured with the spectrometer HADES. The reconstructed K$^0_S$ sample is characterized by good event statistics for a wide range in momentum and rapidity. We compare the experimental $\pi^{-}$ and K$^0_S$ distributions to predictions by the IQMD model. The model calculations show that K$^0_S$ at low tranverse momenta constitute a particularly well suited tool to investigate the kaon in-medium potential. Our K$^0_S$ data suggest a strong repulsive in-medium K$^0$ potential of about 40 MeV strength., Comment: 10 pages, 10 figures, accepted by Phys. Rev. C

Published
2010
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43. Lambda-p femtoscopy in collisions of Ar+KCl at 1.76 AGeV

Author

Agakishiev, G., Balanda, A., Bassini, R., Belver, D., Belyaev, A. V., Blanco, A., Böhmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Díaz, J., Dohrmann, F., Dybczak, A., Eberl, T., Fabbietti, L., Fateev, O. V., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gil, A., Gilardi, C., Golubeva, M., González-Díaz, D., Guber, F., Hennino, T., Holzmann, R., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krizek, F., Krücken, R., Kühn, W., Kugler, A., Kurepin, A., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Mishra, D., Morinière, E., Mousa, J., Müntz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Sobolev, Yu. G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Weber, M., Wendisch, C., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Yurevich, S., Zanevsky, Y. V., Zhou, P., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

Results on $\Lambda$p femtoscopy are reported at the lowest energy so far. At a beam energy of 1.76A~GeV, the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. A high-statistics and high-purity $\Lambda$ sample was collected, allowing for the investigation of $\Lambda$ p correlations at small relative momenta. The experimental correlation function is compared to corresponding model calculations allowing the determination of the space-time extent of the $\Lambda$p emission source. The $\Lambda$p source radius is found slightly smaller than the pp correlation radius for a similar collis ion system. The present $\Lambda$p radius is significantly smaller than that found for Au+Au/Pb+Pb collisio ns in the AGS, SPS and RHIC energy domains, but larger than that observed for electroproduction from He. Taking into account all available data, we find the $\Lambda$p source radius to increase almost linearly with the number of participants to the power of one-third., Comment: 5 pages, 3 figures, submitted to Phys. Rev. C

Published
2010
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44. Inclusive Dielectron Production in Ar+KCl Collisions at 1.76 AGeV studied with HADES

Author

The HADES Collaboration, Krizek, F., Agakishiev, G., Balanda, A., Bellia, G., Belver, D., Belyaev, A., Blanco, A., Boehmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Diaz, J., Dohrmann, F., Dybczak, A., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gil, A., Gilardi, C., Golubeva, M., Gonzalez-Diaz, D., Grosse, E., Guber, F., Heilmann, M., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kaempfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krasa, A., Kruecken, R., Kuehn, W., Kugler, A., Kurepin, A., Lamas-Valverde, J., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Marin, J., Markert, J., Metag, V., Michalska, B., Michel, J., Mishra, D., Moriniere, E., Mousa, J., Muentz, C., Naumann, L., Novotny, R., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Cavalcanti, T. Perez, Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Rustamov, A., Sadovsky, A., Salabura, P., Schmah, A., Simon, R., Sobolev, Yu. G., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Veretenkin, I., Wagner, V., Weber, M., Wisniowski, M., Wuestenfeld, J., Yurevich, S., Zanevsky, Y., Zhou, P., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

Results of the HADES measurement of inclusive dielectron production in Ar+KCl collisions at a kinetic beam energy of 1.76 AGeV are presented. For the first time, high mass resolution spectroscopy was performed. The invariant mass spectrum of dielectrons is compared with predictions of UrQMD and HSD transport codes., Comment: 4 pages, 3 figures - To appear in the conference proceedings for Quark Matter 2009, March 30 - April 4, Knoxville, Tennessee

Published
2009
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45. Deep sub-threshold $\Xi^-$ production in Ar+KCl reactions at 1.76A GeV

Author

Agakishiev, G., Balanda, A., Bassini, R., Belver, D., Belyaev, A. V., Blanco, A., Böhmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Díaz, J., Dohrmann, F., Dybczak, A., Eberl, T., Fabbietti, L., Fateev, O. V., Finocchiaro, P., Fonte, P., Friese, J., Fröhlich, I., Galatyuk, T., Garzón, J. A., Gernhäuser, R., Gil, A., Gilardi, C., Golubeva, M., González-Díaz, D., Guber, F., Hennino, T., Holzmann, R., Iori, I., Ivashkin, A., Jurkovic, M., Kämpfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krizek, F., Krücken, R., Kühn, W., Kugler, A., Kurepin, A., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Mishra, D., Morinière, E., Mousa, J., Müntz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Sobolev, Yu. G., Spataro, S., Spruck, B., Ströbele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Weber, M., Wisniowski, M., Wojcik, T., Wüstenfeld, J., Yurevich, S., Zanevsky, Y. V., and Zhou, P.

Subjects
Nuclear Experiment
Abstract

We report first results on a deep sub-threshold production of the doubly strange hyperon $\Xi^-$ in a heavy-ion reaction. At a beam energy of 1.76A GeV the reaction Ar+KCl was studied with the High Acceptance Di-Electron Spectrometer (HADES) at SIS18/GSI. A high-statistics and high-purity $\Lambda$ sample was collected, allowing for the investigation of the decay channel $\Xi^- \to \Lambda \pi^-$. The deduced $\Xi^-/(\Lambda+\Sigma^0)$ production ratio of $(5.6 \pm 1.2 ^{+1.8}_{-1.7})\cdot 10^{-3}$ is significantly larger than available model predictions., Comment: 4 pages, including 4 figures

Published
2009
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46. Charged pion production in C+C and Ar+KCl collisions measured with HADES

Author

The HADES Collaboration, Tlusty, P., Agakishiev, G., Balanda, A., Bellia, G., Belver, D., Belyaev, A., Blanco, A., Boehmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Diaz, J., Dohrmann, F., Dybczak, A., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gil, A., Gilardi, C., Golubeva, M., Gonzalez-Diaz, D., Grosse, E., Guber, F., Heilmann, M., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kaempfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krasa, A., Krizek, F., Kruecken, R., Kuehn, W., Kugler, A., Kurepin, A., Lamas-Valverde, J., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Marin, J., Markert, J., Metag, V., Michalska, B., Michel, J., Mishra, D., Moriniere, E., Mousa, J., Muentz, C., Naumann, L., Novotny, R., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Cavalcanti, T. Perez, Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Rustamov, A., Sadovsky, A., Salabura, P., Schmah, A., Simon, R., Sobolev, Yu. G., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Traxler, M., Trebacz, R., Tsertos, H., Veretenkin, I., Wagner, V., Weber, M., Wisniowski, M., Wuestenfeld, J., Yurevich, S., Zanevsky, Y., Zhou, P., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

Results of a study of charged pion production in 12C+12C collisions at incident beam energies of 1A GeV and 2A GeV, and 40Ar+natKCl at 1.76AGeV, using the spectrometer HADES at GSI, are presented. We have performed a measurement of the transverse momentum distributions of pi+- mesons covering a fairly large rapidity interval, in case of the C+C collision system for the first time. The yields, transverse mass and angular distributions are compared with a transport model as well as with existing data from other experiments., Comment: 7 pages, 2 figures Contribution presented at the XLVII International Winter Meeting on Nuclear Physics, Bormio (Italy), Jan. 26-30, 2009

Published
2009

47. Future perspectives at SIS-100 with HADES-at-FAIR

Author

The HADES Collaboration, Froehlich, I., Agakishiev, G., Balanda, A., Bellia, G., Belver, D., Belyaev, A., Blanco, A., Boehmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Diaz, J., Dohrmann, F., Dybczak, A., Fabbietti, L., Fateev, O., Finocchiaro, P., Fonte, P., Friese, J., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gil, A., Gilardi, C., Golubeva, M., Gonzalez-Diaz, D., Grosse, E., Guber, F., Heilmann, M., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kaempfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krasa, A., Krizek, F., Kruecken, R., Kuehn, W., Kugler, A., Kurepin, A., Lamas-Valverde, J., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Marin, J., Markert, J., Metag, V., Michalska, B., Michel, J., Mishra, D., Moriniere, E., Mousa, J., Muentz, C., Naumann, L., Novotny, R., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Cavalcanti, T. Perez, Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Rustamov, A., Sadovsky, A., Salabura, P., Schmah, A., Simon, R., Sobolev, Yu. G., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Veretenkin, I., Wagner, V., Weber, M., Wisniowski, M., Wuestenfeld, J., Yurevich, S., Zanevsky, Y., Zhou, P., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

Currently, the HADES spectrometer undergoes un upgrade program to be prepared for measurements at the upcoming SIS-100 synchrotron at FAIR. We describe the current status of the HADES di-electron measurements at the SIS-18 and our future plans for SIS-100., Comment: Invited contribution presented at the XLVII International Winter Meeting on Nuclear Physics, Bormio (Italy), Jan. 26-30, 2009

Published
2009

48. Measurement of charged pions in 12C + 12C collisions at 1A GeV and 2A GeV with HADES

Author

The HADES Collaboration, Agakishiev, G., Agodi, C., Balanda, A., Bellia, G., Belver, D., Belyaev, A., Bielcik, J., Blanco, A., Bortolotti, A., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Chernenko, S., Christ, T., Coniglione, R., Destefanis, M., Diaz, J., Dohrmann, F., Duran, I., Dybczak, A., Eberl, T., Fabbietti, L., Fateev, O., Ferreira-Marques, R., Finocchiaro, P., Fonte, P., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gil, A., Gilardi, C., Golubeva, M., Gonzalez-Diaz, D., Grosse, E., Guber, F., Heilmann, M., Heinz, T., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kaempfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Kozuch, A., Krasa, A., Krizek, F., Kruecken, R., Kuehn, W., Kugler, A., Kurepin, A., Lamas-Valverde, J., Lang, S., Lange, J. S., Lapidus, K., Lopes, L., Lorenz, M., Maier, L., Maiolino, C., Mangiarotti, A., Marin, J., Markert, J., Metag, V., Michalska, B., Michel, J., Moriniere, E., Mousa, J., Muench, M., Muentz, C., Naumann, L., Novotny, R., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., Cavalcanti, T. Perez, Piattelli, P., Pietraszko, J., Pospisil, V., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Sapienza, P., Schmah, A., Schroeder, C., Schwab, E., Simon, R. S., Sobolev, Yu. G., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebacz, R., Tsertos, H., Wagner, V., Weber, M., Wisniowski, M., Wojcik, T., Wuestenfeld, J., Yurevich, S., Zanevsky, Y., Zhou, P., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

We present the results of a study of charged pion production in 12C + 12C collisions at incident beam energies of 1A GeV and 2A GeV using the HADES spectrometer at GSI. The main emphasis of the HADES program is on the dielectron signal from the early phase of the collision. Here, however, we discuss the data with respect to the emission of charged hadrons, specifically the production of pi+- mesons, which are related to neutral pions representing a dominant contribution to the dielectron yield. We have performed the first large-angular range measurement of the distribution of pi+- mesons for the 12C + 12C collision system covering a fairly large rapidity interval. The pion yields, transverse-mass and angular distributions are compared with calculations done within a transport model, as well as with existing data from other experiments. The anisotropy of pion production is systematically analyzed., Comment: 15 pages, 13 figures, v2 - the text unchanged, only full author list added to METADATA (in v1 only the first author and collaboration name), reference to published paper added

Published
2009
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49. The High-Acceptance Dielectron Spectrometer HADES

Author

The HADES Collaboration, Agakishiev, G., Balanda, A., Bannier, B., Bassini, R., Belver, D., Belyaev, A. V., Blanco, A., Boehmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Diaz, J., Dohrmann, F., Dybczak, A., Eberl, T., Enghardt, W., Fabbietti, L., Fateev, O. V., Finocchiaro, P., Fonte, P., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gil, A., Gilardi, C., Golubeva, M., Gonzalez-Diaz, D., Guber, F., Heilmann, M., Heinz, T., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kaempfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krizek, F., Kruecken, R., Kuehn, W., Kugler, A., Kurepin, A., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Mishra, D., Moriniere, E., Mousa, J., Muentz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., PerezCavalcanti, T., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Schwab, E., Sobolev, Yu. G., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebac, R., Tsertos, H., Wagner, V., Weber, M., Wisniowski, M., Wojcik, T., Wuestenfel, J., Yurevich, S., Zanevsky, Y. V., Zhou, P., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

HADES is a versatile magnetic spectrometer aimed at studying dielectron production in pion, proton and heavy-ion induced collisions. Its main features include a ring imaging gas Cherenkov detector for electron-hadron discrimination, a tracking system consisting of a set of 6 superconducting coils producing a toroidal field and drift chambers and a multiplicity and electron trigger array for additional electron-hadron discrimination and event characterization. A two-stage trigger system enhances events containing electrons. The physics program is focused on the investigation of hadron properties in nuclei and in the hot and dense hadronic matter. The detector system is characterized by an 85% azimuthal coverage over a polar angle interval from 18 to 85 degree, a single electron efficiency of 50% and a vector meson mass resolution of 2.5%. Identification of pions, kaons and protons is achieved combining time-of-flight and energy loss measurements over a large momentum range. This paper describes the main features and the performance of the detector system.

Published
2009
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50. Phi decay: a relevant source for K- production at SIS energies?

Author

The HADES Collaboration, Agakishiev, G., Balanda, A., Bannier, B., Bassini, R., Belver, D., Belyaev, A. V., Blanco, A., Boehmer, M., Boyard, J. L., Braun-Munzinger, P., Cabanelas, P., Castro, E., Chernenko, S., Christ, T., Destefanis, M., Diaz, J., Dohrmann, F., Dybczak, A., Eberl, T., Enghardt, W., Fabbietti, L., Fateev, O. V., Finocchiaro, P., Fonte, P., Friese, J., Froehlich, I., Galatyuk, T., Garzon, J. A., Gernhaeuser, R., Gil1, A., Gilardi, C., Golubeva, M., Gonzalez-Diaz, D., Guber, F., Heilmann, M., Heinz, T., Hennino, T., Holzmann, R., Ierusalimov, A., Iori, I., Ivashkin, A., Jurkovic, M., Kaempfer, B., Kanaki, K., Karavicheva, T., Kirschner, D., Koenig, I., Koenig, W., Kolb, B. W., Kotte, R., Krizek, F., Kruecken, R., Kuehn, W., Kugler, A., Kurepin, A., Lang, S., Lange, J. S., Lapidus, K., Liu, T., Lopes, L., Lorenz, M., Maier, L., Mangiarotti, A., Markert, J., Metag, V., Michalska, B., Michel, J., Mishra, D., Moriniere, E., Mousa, J., Muentz, C., Naumann, L., Otwinowski, J., Pachmayer, Y. C., Palka, M., Parpottas, Y., Pechenov, V., Pechenova, O., PerezCavalcanti, T., Pietraszko, J., Przygoda, W., Ramstein, B., Reshetin, A., Roy-Stephan, M., Rustamov, A., Sadovsky, A., Sailer, B., Salabura, P., Schmah, A., Schwab, E., Sobolev, Yu. G., Spataro, S., Spruck, B., Stroebele, H., Stroth, J., Sturm, C., Sudol, M., Tarantola, A., Teilab, K., Tlusty, P., Traxler, M., Trebac, R., Tsertos, H., Wagner, V., Weber, M., Wisniowski, M., Wojcik, T., Wuestenfel, J., Yurevich, S., Zanevsky, Y. V., Zhou, P., and Zumbruch, P.

Subjects
Nuclear Experiment
Abstract

We present phase space distributions and multiplicities of K+, K- and phi mesons produced in Ar+KCl reactions at a kinetic beam energy of 1.756 AGeV and measured with the HADES spectrometer. The inverse slope parameters and yields of kaons supplement the systematics of previous measurements. The percentage of K- mesons coming fromphi decay is found to be 18+- 7%.

Published
2009
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