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  • 1.
    Aaboud, M.
    et al.
    Faculté des Sciences, Université Mohamed Premier and LPTPM, Oujda, Morocco.
    Aad, G.
    CPPM, Aix-Marseille Université and CNRS/IN2P3, Marseille, France.
    Abbott, B.
    Homer L. Dodge Department of Physics and Astronomy, University of Oklahoma, Norman, United States of America.
    Abdallah, J.
    University of Iowa, Iowa City, United States of America.
    Augsten, K.
    Czech Technical University in Prague, Praha, Czech Republic.
    Caforio, D.
    Czech Technical University in Prague, Praha, Czech Republic.
    Gallus, P.
    Czech Technical University in Prague, Praha, Czech Republic.
    Guenther, J.
    Czech Technical University in Prague, Praha, Czech Republic.
    Hubaček, Z.
    Czech Technical University in Prague, Praha, Czech Republic.
    Myska, M.
    Czech Technical University in Prague, Praha, Czech Republic.
    Pospisil, S.
    Czech Technical University in Prague, Praha, Czech Republic.
    Seifert, F.
    Czech Technical University in Prague, Praha, Czech Republic.
    Simak, V.
    Czech Technical University in Prague, Praha, Czech Republic.
    Slavicek, Tomas
    Czech Technical University in Prague, Praha, Czech Republic.
    Smolek, K.
    Czech Technical University in Prague, Praha, Czech Republic.
    Solar, M.
    Czech Technical University in Prague, Praha, Czech Republic.
    Sopczak, A.
    Czech Technical University in Prague, Praha, Czech Republic.
    Sopko, V.
    Czech Technical University in Prague, Praha, Czech Republic.
    Suk, M.
    Czech Technical University in Prague, Praha, Czech Republic.
    Tureček, D.
    Czech Technical University in Prague, Praha, Czech Republic.
    Search for the Standard Model Higgs boson produced by vector-boson fusion and decaying to bottom quarks in root s=8TeV pp collisions with the ATLAS detector2016In: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, no 112Article in journal (Refereed)
    Abstract [en]

    A search with the ATLAS detector is presented for the Standard Model Higgs boson produced by vector-boson fusion and decaying to a pair of bottom quarks, using 20.2 fb−1 of LHC proton-proton collision data at s=8" role="presentation" style="box-sizing: border-box; display: inline-table; line-height: normal; letter-spacing: normal; word-spacing: normal; word-wrap: normal; white-space: nowrap; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; padding: 0px; margin: 0px; position: relative;">s√=8s=8 TeV. The signal is searched for as a resonance in the invariant mass distribution of a pair of jets containing b-hadrons in vector-boson-fusion candidate events. The yield is measured to be −0.8 ± 2.3 times the Standard Model cross-section for a Higgs boson mass of 125 GeV. The upper limit on the cross-section times the branching ratio is found to be 4.4 times the Standard Model cross-section at the 95% confidence level, consistent with the expected limit value of 5.4 (5.7) in the background-only (Standard Model production) hypothesis.

  • 2.
    Kozyrev, A.
    et al.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Mitrofanov, I.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Owens, A.
    European Space Agency, The Netherlands.
    Quarati, F.
    AP, RST, FAME, Delft University of Technology, The Netherlands; Gonitec BV, The Netherlands .
    Benkhoff, J.
    European Space Agency, The Netherlands.
    Bakhtin, B.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Fedosov, F.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Golovin, D.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Litvak, M.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Malakhov, A.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Mokrousov, M.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Nuzhdin, I.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Sanin, A.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Tretyakov, V.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Vostrukhin, A.
    Space Research Institute of the Russian Academy of Sciences (IKI), Russia.
    Timoshenko, G.
    Joint Institute for Nuclear Research, Russia.
    Shvetsov, V.
    Joint Institute for Nuclear Research, Russia.
    Granja, C.
    Czech Technical University in Prague, Czech.
    Slavicek, Tomas
    Czech Technical University in Prague, Czech.
    Pospisil, S.
    Czech Technical University in Prague, Czech.
    A comparative study of LaBr3(Ce3+) and CeBr3 based gamma-ray spectrometers for planetary remote sensing applications2016In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 87, no 8Article in journal (Refereed)
    Abstract [en]

    The recent availability of large volume cerium bromide crystals raises the possibility of substantially improving gamma-ray spectrometer limiting flux sensitivities over current systems based on the lanthanum tri-halides, e.g., lanthanum bromide and lanthanum chloride, especially for remote sensing, low-level counting applications or any type of measurement characterized by poor signal to noise ratios. The Russian Space Research Institute has developed and manufactured a highly sensitive gamma-ray spectrometer for remote sensing observations of the planet Mercury from the Mercury Polar Orbiter (MPO), which forms part of ESA’s BepiColombo mission. The Flight Model (FM) gamma-ray spectrometer is based on a 3-in. single crystal of LaBr3(Ce3+) produced in a separate crystal development programme specifically for this mission. During the spectrometers development, manufacturing, and qualification phases, large crystals of CeBr3 became available in a subsequent phase of the same crystal development programme. Consequently, the Flight Spare Model (FSM) gamma-ray spectrometer was retrofitted with a 3-in. CeBr3 crystal and qualified for space. Except for the crystals, the two systems are essentially identical. In this paper, we report on a comparative assessment of the two systems, in terms of their respective spectral properties, as well as their suitability for use in planetary mission with respect to radiation tolerance and their propensity for activation. We also contrast their performance with a Ge detector representative of that flown on MESSENGER and show that: (a) both LaBr3(Ce3+) and CeBr3 provide superior detection systems over HPGe in the context of minimally resourced spacecraft and (b) CeBr3 is a more attractive system than LaBr3(Ce3+) in terms of sensitivities at lower gamma fluxes. Based on the tests, the FM has now been replaced by the FSM on the BepiColombo spacecraft. Thus, CeBr3 now forms the central gamma-ray detection element on the MPO spacecraft. Published by AIP Publishing.

  • 3.
    Krapohl, David
    et al.
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Nilsson, Hans-Erik
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Petersson, Sture
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Pospisil, S
    Institute of Experimental and Applied Physics (IEAP), Czech Technical University, Horskà 3a/22, 128 00 Prague 2, Czech Republic.
    Slavicek, Tomas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Thungström, Göran
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Simulation of a silicon neutron detector coated with TiB 2 absorber2012In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 7, no 1, p. Art. no. C01096-Article in journal (Refereed)
    Abstract [en]

    Neutron radiation cannot be directly detected in semiconductor detectors and therefore needs converter layers. Planar clean-room processing can be used in the manufacturing process of semiconductor detectors with metal layers to produce a cost-effective device. We used the Geant4 Monte-Carlo toolkit to simulate the performance of a semiconductor neutron detector. A silicon photo-diode was coated with vapour deposited titanium, aluminium thin films and a titaniumdiboride (TiB 2) neutron absorber layer. The neutron capture reaction 10B(n, alpha)7Li is taken advantage of to create charged particles that can be counted. Boron-10 has a natural abundance of about SI 19.8%. The emitted alpha particles are absorbed in the underlying silicon detector. We varied the thickness of the converter layer and ran the simulation with a thermal neutron source in order to find the best efficiency of the TiB 2 converter layer and optimize the clean room process. © 2012 IOP Publishing Ltd and SISSA.

  • 4.
    Singh, S.
    et al.
    Institute of Physics of the ASCR, ELI-Beamlines, Czech Republic.
    Slavicek, Tomas
    Czech Technical University in Prague, Prague, Czech Republic.
    Hodak, R.
    Czech Technical University in Prague, Prague, Czech Republic.
    Versaci, R.
    Institute of Physics of the ASCR, ELI-Beamlines, Czech Republic.
    Pridal, P.
    Czech Technical University in Prague, Prague, Czech Republic.
    Kumar, D.
    Institute of Physics of the ASCR, ELI-Beamlines, Czech Republic.
    Absolute calibration of imaging plate detectors for electron kinetic energies between 150 keV and 1.75 MeV2017In: Review of Scientific Instruments, ISSN 0034-6748, E-ISSN 1089-7623, Vol. 88, no 7Article in journal (Refereed)
    Abstract [en]

    This paper presents the calibration of two different kinds of image plates (IPs) for detecting electrons with kinetic energy in the range of 150 keV-1.75 MeV. The calibration was performed using a Sr-90 beta source. The paper also provides the measured fading response for the IPs in the time range from 12 min to 18 h. Calibration results are compared to Monte Carlo simulations of energy deposited by the electrons in the sensitive layer of the IPs. It was found that within this energy range a linear relation between simulated energy deposited by the electron in the phosphor layer and the measured photo stimulated luminescence in the IP is adequate to model the response of the IP. 

  • 5.
    Slavicek, Tomas
    et al.
    Institute of Experimental and Applied Physics, Czech Technical University in Prague, Horska 3a/22, 128 00 Praha, Czech Republic.
    Kralik, M
    Czech Metrology Institute, Radiová 1, 102 00 Praha 10, Czech Republic.
    Krapohl, David
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Petersson, Sture
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    Pospisil, S
    Institute of Experimental and Applied Physics, Czech Technical University in Prague, Horska 3a/22, 128 00 Praha, Czech Republic.
    Thungström, Göran
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Information Technology and Media.
    A thermal neutron detector based on planar silicon sensor with TiB 2 coating2012In: Journal of Instrumentation, ISSN 1748-0221, E-ISSN 1748-0221, Vol. 7, no 1, p. Art. no. C01053-Article in journal (Refereed)
    Abstract [en]

    Neutron radiation as a non-ionizing radiation is particularly difficult to detect; therefore a conversion material is required. The conversion material converts neutrons into secondary charged particles in order for them to be detected in a silicon detector. The use of titanium diboride (TiB 2) as the conversion material deposited by an electron beam-physical vapour deposition (EB-PVD) as a part of a front-side contact of a planar silicon detector is presented. The effect of different front-side contact material compositions is discussed. The detectors behaviour was examined using alpha particles and thermal neutrons from an 241Am-Be source. Simultaneously, a Geant4 simulation was so as executed to evaluate the conversion layer functionality and to discover the conversion material thickness for the best neutron detection efficiency. © 2012 IOP Publishing Ltd and SISSA.

  • 6. Slavicek, Tomas
    et al.
    Pospisil, S.
    Advanced Detectors for Better Awareness of Neutrons and Gamma Rays in Environment2017Report (Other academic)
  • 7. Slavicek, Tomas
    et al.
    Pospisil, S.
    Masek, P.
    Urban, T.
    Trojek, T.
    Kohout, Z.
    Development of Neutron Image Sensor Technology for AD-BANG project2016In: 2016 IEEE NSS/MIC, 2016Conference paper (Refereed)
  • 8.
    Slavicek, Tomas
    et al.
    Czech Technical University in Prague, Czech Republic .
    Pospisil, Stanislav
    Advanced Detectors for Better Awareness of Neutrons and Gamma Rays in Environment2016Report (Other academic)
  • 9.
    Ulyanov, A.
    et al.
    School of Physics, University College Dublin, Ireland.
    Morris, O.
    School of Physics, University College Dublin, Ireland; Galway-Mayo Institute of Technology, Galway, Ireland.
    Hanlon, L
    School of Physics, University College Dublin, Ireland.
    Mc Breen, S
    School of Physics, University College Dublin, Ireland.
    Foley, S
    School of Physics, University College Dublin, Ireland.
    Roberts, O
    School of Physics, University College Dublin, Ireland.
    Tobin, I
    School of Physics, University College Dublin, Ireland.
    Murphy, D
    School of Physics, University College Dublin, Ireland.
    Wade, C
    School of Physics, University College Dublin, Ireland.
    Nelms, N
    European Space Agency, ESTEC.
    Shortt, B
    European Space Agency, ESTEC.
    Slavicek, Tomas
    Czech Technical University in Prague.
    Granja, C.
    Czech Technical University in Prague.
    Solar, M.
    Czech Technical University in Prague.
    Performance of a monolithic LaBr3: Ce crystal coupled to an array of silicon photomultipliers2016In: Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, ISSN 0168-9002, E-ISSN 1872-9576, Vol. 810, no 810, p. 107-119Article in journal (Refereed)
    Abstract [en]

    A gamma-ray detector composed of a single 28×28×20 mm3 LaBr3:Ce crystal coupled to a custom built 4×4 array of silicon photomultipliers was tested over an energy range of 30 keV to 9.3 MeV. The silicon photomultipliers were initially calibrated using 20 ns light pulses generated by a light emitting diode. The photodetector responses measured as a function of the number of incident photons were found to be non-linear and consistent with model predictions. Using corrections for the non-linearity of the silicon photomultipliers, the detector showed a linear response to gamma-rays with energies from 100 keV to the maximum available energy of 9.3 MeV. The energy resolution was found to be 4% FWHM at 662 keV. Despite the large thickness of the scintillator (20 mm) and a 5 mm thick optical window, the detector was capable of measuring the positions of the gamma-ray interaction points. The position resolution was measured at 356 keV and was found to be 8 mm FWHM in the detector plane and 11 mm FWHM for the depth of interaction. The detector can be used as a building block of a larger calorimeter system that is capable of measuring gamma-ray energies up to tens of MeV.

  • 10. Urban, T.
    et al.
    Slavicek, Tomas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Hulka, J.
    Kok, A.
    Meier, D.
    Masek, P.
    Pospisil, S.
    Koybasi, O.
    Trojek, T.
    Stripové křemíkové senzory pro měření ve směsných neutron-gama radiačních polích2016In: XXXVIII. Dny radiačni ochrany, 2016Conference paper (Other academic)
  • 11. Urban, T.
    et al.
    Slavicek, Tomas
    Mid Sweden University, Faculty of Science, Technology and Media, Department of Electronics Design.
    Pospisil, S.
    Kok, A.
    Trojek, T.
    New Neutron Detector Design Optimization by Monte Carlo Simulation2016Conference paper (Refereed)
1 - 11 of 11
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