E. Traykov

Publications (12)10.24 Total impact

• Article: A compact radio frequency quadrupole for ion bunching in the WITCH experiment

  E. Traykov, M. Beck, M. Breitenfeldt, P. Delahaye, V. De Leebeeck, P. Friedag, A. Herlert, N. Geeraert, W. Heirman, P.-I. Lonne, [......], S. Roccia, G. Soti, M. Tandecki, M. Timmermans, J. Thiboud, S. Van Gorp, F. Wauters, C. Weinheimer, D. Zakoucky, N. Severijns
  Nucl. Inst. And Meth. In Phys. Res. 02/2013; A(648):1-18.
• Source

  Available from: Victor Golovko

  Article: Hyperfine field and hyperfine anomalies of copper impurities in iron

  V. V. Golovko, F. Wauters, S. Cottenier, M. Breitenfeldt, V. De Leebeeck, S. Roccia, G. Soti, M. Tandecki, E. Traykov, S. Van Gorp, D. Zákoucký, N. Severijns
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  ABSTRACT: A new value for the hyperfine magnetic field of copper impurities in iron is obtained by combining resonance frequencies from experiments involving β-NMR on oriented nuclei on 59Cu, 69Cu, and 71Cu with magnetic moment values from collinear laser spectroscopy measurements on these isotopes. The resulting value, i.e., Bhf(CuFe) = -21.794(10) T, is in agreement with the value adopted until now but is an order of magnitude more precise. It is consistent with predictions from ab initio calculations. Comparing the hyperfine field values obtained for the individual isotopes, the hyperfine anomalies in Fe were determined to be 59Δ69=0.15(9)% and 71Δ69=0.07(11)%.
  Phys. Rev. C. 07/2011; 84(1).
• Article: Computer controls for the WITCH experiment

  M. Tandecki, D. Beck, M. Beck, H. Brand, M. Breitenfeldt, V. De Leebeeck, P. Friedag, A. Herlert, V. Kozlov, J. Mader, S. Roccia, G. Soti, E. Traykov, S. Van Gorp, F. Wauters, Ch. Weinheimer, D. Zákoucký, N. Severijns
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  ABSTRACT: The WITCH experiment is a medium-scale experimental set-up located at ISOLDE/CERN. It combines a double Penning trap system with a retardation spectrometer for energy measurements of recoil ions from β decay. For a correct operation of such a set-up a whole range of different devices is required. Along with the installation and optimization of the set-up a computer control system was developed to control these devices. The CS-Framework that is developed and maintained at GSI, was chosen as a basis for this control system as it is perfectly suited to handle the distributed nature of a control system.We report here on the required hardware for WITCH, along with the basis of this CS-Framework and the add-ons that were implemented for WITCH.
  Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 03/2011; 629:396-405. · 1.21 Impact Factor
• Article: Simbuca, using a graphics card to simulate Coulomb interactions in a penning trap

  S. Van Gorp, M. Beck, M. Breitenfeldt, V. De Leebeeck, P. Friedag, A. Herlert, T. Iitaka, J. Mader, V. Kozlov, S. Roccia, G. Soti, M. Tandecki, E. Traykov, F. Wauters, Ch. Weinheimer, D. Zákoucký, N. Severijns
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  ABSTRACT: In almost all cases, N-body simulations are limited by the computation time available. Coulomb interaction calculations scale with O(N2) with N the number of particles. Approximation methods exist already to reduce the computation time to O(NlogN), although calculating the interaction still dominates the total simulation time. We present Simbuca, a simulation package for thousands of ions moving in a Penning trap which will be applied for the WITCH experiment. Simbuca uses the output of the Cunbody-1 library, which calculates the gravitational interaction between entities on a graphics card, and adapts it for Coulomb calculations. Furthermore the program incorporates three realistic buffer gas models, the possibility of importing realistic electric and magnetic fieldmaps and different order integrators with adaptive step size and error control. The software is released under the GNU General Public License and free for use.
  Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 01/2011; 638(1):192-200. · 1.21 Impact Factor
• Source

  Available from: Martin Breitenfeldt

  Article: Half-life of^{221} Fr in Si and Au at 4 K and at millikelvin temperatures

  F. Wauters, B. Verstichel, M. Breitenfeldt, V. De Leebeeck, V. Yu. Kozlov, I. Kraev, S. Roccia, G. Soti, M. Tandecki, E. Traykov, S. Van Gorp, D. Zákoucký, N. Severijns
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  ABSTRACT: The half-life of the α-decaying nucleus 221Fr was determined in different environments, that is, embedded in Si at 4 K, and embedded in Au at 4 K and about 20 mK. No differences in half-life for these different conditions were observed within 0.1%. Furthermore, we quote a value for the absolute half-life of 221Fr of t1/2=286.1(10) s that is of comparable precision to the most precise value available in the literature.
  Physical Review C 12/2010; 82:064317. · 3.31 Impact Factor
• Source

  Available from: Victor Golovko

  Article: Precision measurements of the $^{60}$Co $\beta$-asymmetry parameter in search for tensor currents in weak interactions

  F. Wauters, I. S. Kraev, D. Zákoucký, M. Beck, M. Breitenfeldt, V. De Leebeeck, V. V. Golovko, V. Yu. Kozlov, T. Phalet, S. Roccia, G. Soti, M. Tandecki, I. S. Towner, E. Traykov, S. Van Gorp, N. Severijns
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  ABSTRACT: The $\beta$-asymmetry parameter $\widetilde{A}$ for the Gamow-Teller decay of $^{60}$Co was measured by polarizing the radioactive nuclei with the brute force low-temperature nuclear-orientation method. The $^{60}$Co activity was cooled down to milliKelvin temperatures in a $^3$He-$^4$He dilution refrigerator in an external 13 T magnetic field. The $\beta$ particles were observed by a 500 ${\mu}m$ thick Si PIN diode operating at a temperature of about 10 K in a magnetic field of 0.6 T. Extensive GEANT4 Monte-Carlo simulations were performed to gain control over the systematic effects. Our result, $\widetilde{A} = -1.014(12)_{stat}(16)_{syst}$, is in agreement with the Standard-Model value of $-0.987(9)$, which includes recoil-order corrections that were addressed for the first time for this isotope. Further, it enables limits to be placed on possible tensor-type charged weak currents as well as other physics beyond the Standard Model.
  Physical Review C 05/2010; 82:1-14. · 3.31 Impact Factor
• Source

  Available from: Victor Golovko

  Article: A GEANT4 Monte-Carlo simulation code for precision beta-spectroscopy

  F Wauters, I Kraev, D Z Akouc Y, M Beck, V V Golovko, V Yu, Kozlov, T Phalet, M Tandecki, E Traykov, S Van Gorp, N Severijns
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  ABSTRACT: a b s t r a c t The measurement of the b asymmetry parameter in nuclear b decay is a potentially very sensitive tool to search for non V–A components in the charge-changing weak interaction. To reach the required precision (percent level) all effects that modify the emission pattern of the b radiation, i.e. the geometry of the setup, the effect of the magnetic field on the trajectories of b particles as well as (back)scattering in the source, on the sample holder and on the detector, have to be correctly taken into account in the analysis of the data. A thorough study of these effects and a new method based on detailed GEANT4 Monte-Carlo simulations that was developed for this purpose is presented here. The code was developed for b asymmetry measurements by means of the Low Temperature Nuclear Orientation (LTNO) method, but can in principle be generalized to other experimental setups using other polarization techniques. & 2009 Elsevier B.V. All rights reserved.
  Nuclear Instruments and Methods in Physics Research Section A Accelerators Spectrometers Detectors and Associated Equipment 09/2009; · 1.21 Impact Factor
• Source

  Available from: Victor Golovko

  Article: A GEANT4 Monte-Carlo Simulation Code for precision beta spectroscopy

  F. Wauters, I. Kraev, D. Zakoucky, M. Beck, V. V. Golovko, V. Yu. Kozlov, T. Phalet, M. Tandecki, E. Traykov, S. Van Gorp, N. Severijns
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  ABSTRACT: The measurement of the beta asymmetry parameter in nuclear beta decay is a potentially very sensitive tool to search for non V-A components in the charge-changing weak interaction. To reach the required precision (percent level) all effects that modify the emission pattern of the beta radiation, i.e. the geometry of the setup, the effect of the magnetic field on the trajectories of beta particles as well as (back)scattering in the source, on the sample holder and on the detector, have to be correctly taken into account in the analysis of the data. A thorough study of these effects and a new method based on detailed GEANT4 Monte-Carlo simulations that was developed for this purpose is presented here. The code was developed for beta asymmetry measurements by means of the Low Temperature Nuclear Orientation (LTNO) method, but can in principle be generalized to other experimental setups using other polarization techniques.
  07/2009;
• Article: Hyperfine field of einsteinium in iron and nuclear magnetic moment of^{254} Es

  N. Severijns, A. A. Belyaev, A. L. Erzinkyan, P. -D. Eversheim, V. T. Filimonov, V. V. Golovko, G. M. Gurevich, P. Herzog, I. S. Kraev, A. A. Lukhanin, [......], A. V. Rusakov, M. Tandecki, Yu. G. Toporov, C. Tramm, E. Traykov, S. Van Gorp, V. N. Vyachin, F. Wauters, D. Zákoucký, E. Zotov
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  ABSTRACT: The angular distributions of γ rays and α particles from oriented 250Bk, 253,254Es, and 255Fm nuclei were investigated to extract hyperfine interaction information for these actinide impurities in an iron host lattice. The hyperfine field of einsteinium in iron was found to be |Bhf(EsFe̲ |)=396(32) T. With this value the magnetic moment of 254Es was then determined as |μ|=4.35(41) μN.
  Phys. Rev. C. 06/2009; 79(6).
• Source

  Available from: ArXiv

  Article: Performance of silicon PIN photodiodes at low temperatures and in high magnetic fields

  F. Wauters, I.S. Kraev, M. Tandecki, E. Traykov, S. Van Gorp, D. Zákoucký, N. Severijns
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  ABSTRACT: The performance of an Si p–i–n (PIN) diode (type Hamamatsu S3590-06) as an energy sensitive detector operating at cryogenic temperatures () and in magnetic fields up to 11 T was investigated, using a 207Bi conversion electron source. It was found that the detector still performs well under these conditions, with small changes in the response function being observed in high magnetic fields, e.g. a 30–50% decrease in energy resolution. A Monte Carlo simulation with the GEANT4 toolkit showed that the observed effects are mainly due to the modified trajectories of the electrons due to the influence of the magnetic field, which changes the scattering conditions, rather than to intrinsic changes of the performance of the detector itself.
  Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment. 12/2008;
• Source

  Available from: ArXiv

  Article: Beta asymmetry parameter in the decay of 114In

  F. Wauters, V. De Leebeeck, I. Kraev, M. Tandecki, E. Traykov, S. Van Gorp, N. Severijns, D. Zakoucky
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  ABSTRACT: The beta asymmetry parameter A for the pure Gamow-Teller decay of 114In is reported. The low temperature nuclear orientation method was combined with a GEANT4 based simulation code allowing for the first time to address in detail the effects of scattering and of the magnetic field. The result, A = -0.994 +/- 0.010stat +/- 0.010syst, constitutes the most accurate value for the asymmetry parameter of a nuclear beta transition to date. The value is in agreement with the Standard Model prediction of A = -1 and provides new limits on tensor type charged weak currents. Comment: 11 pages, 2 figures; additional information was added on systematic effects, the magnetic field map and the calculation of the Qcos(theta) values
  12/2008;
• Article: β asymmetry parameter in the decay of^{114} In

  F. Wauters, V. De Leebeeck, I. Kraev, M. Tandecki, E. Traykov, S. Van Gorp, N. Severijns, D. Zákoucký
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  ABSTRACT: The β-asymmetry parameter à for the pure Gamow-Teller decay of 114In is reported. The low-temperature nuclear orientation method was combined with a GEANT4-based simulation code allowing us, for the first time, to address in detail the effects of scattering and the magnetic field. The result, Ã=-0.994±0.010stat±0.010syst, constitutes the most accurate value for the asymmetry parameter of a nuclear β transition to date. The value is in agreement with the Standard Model prediction of Ã=-1 and provides new limits on tensor-type charged weak currents.
  Phys. Rev. C. 80(6).