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First high-statistics and high-resolution recoil-ion data from the WITCH retardation spectrometer
/ Finlay, P (Leuven U.) ; Breitenfeldt, M (Leuven U.) ; Porobić, T (Leuven U.) ; Wursten, E (Leuven U.) ; Ban, G (Caen U.) ; Beck, M (Munster U.) ; Couratin, C (Leuven U.) ; Fabian, X (Caen U.) ; Fléchard, X (Caen U.) ; Friedag, P (Munster U.) et al.
The first high-statistics and high-resolution data set for the integrated recoil-ion energy spectrum following the $ \beta^+$ decay of$^{35}$Ar has been collected with the WITCH retardation spectrometer located at CERN-ISOLDE. Over 25 million recoil-ion events were recorded on a large-area multichannel plate (MCP) detector with a time-stamp precision of 2ns and position resolution of 0.1mm due to the newly upgraded data acquisition based on the LPC Caen FASTER protocol. [...]
2016
- Published in : Eur. Phys. J. A 52 (2016) 206
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Space-charge effects in Penning ion traps
/ Porobić, T (KU Leuven, Dept. Phys. Astron.) ; Beck, M (Munster U.) ; Breitenfeldt, M (KU Leuven, Dept. Phys. Astron.) ; Couratin, C (Caen U.) ; Finlay, P (KU Leuven, Dept. Phys. Astron.) ; Knecht, A (KU Leuven, Dept. Phys. Astron. ; CERN) ; Fabian, X (Caen U.) ; Friedag, P (Munster U.) ; Fléchard, X (Caen U.) ; Liénard, E (Caen U.) et al.
The influence of space-charge on ion cyclotron resonances and magnetron eigenfrequency in a gas-filled Penning ion trap has been investigated. Off-line measurements with View the MathML source using the cooling trap of the WITCH retardation spectrometer-based setup at ISOLDE/CERN were performed. [...]
2015 - 10 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 785 (2015) 153-162
Elsevier Open Access article: PDF;
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Search for a scalar component in the weak interaction
/ Zakoucky, Dalibor (Rez, Nucl. Phys. Inst.) ; Baczyk, Pavel (CERN) ; Ban, Gilles (Caen U.) ; Beck, Marcus (Munster U. ; Mainz U.) ; Breitenfeldt, Martin (KU Leuven, Dept. Phys. Astron.) ; Couratin, Claire (Caen U.) ; Fabian, Xavier (Caen U.) ; Finlay, Paul (KU Leuven, Dept. Phys. Astron.) ; Flechard, Xavier (Caen U.) ; Friedag, Peter (Munster U. ; U. Munster) et al.
Weak interactions are described by the Standard Model which uses the basic assumption of a pure “V(ector)-A(xial vector)” character for the interaction. However, after more than half a century of model development and experimental testing of its fundamental ingredients, experimental limits for possible admixtures of scalar and/or tensor interactions are still as high as 7%. [...]
2015 - 4 p.
- Published in : JPS Conf. Proc. 6 (2015) 030065
In : 2nd Conference on Advances in Radioactive Isotope Science, Tokyo, Japan, 1 - 6 Jun 2014, pp.030065
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Measurement of the $\beta$-asymmetry parameter of $^{67}$Cu in search for tensor type currents in the weak interaction
/ Soti, G. (Leuven U.) ; Wauters, F. (Leuven U.) ; Breitenfeldt, M. (Leuven U.) ; Finlay, P. (Leuven U.) ; Herzog, P. (Bonn U., HISKP) ; Knecht, A. (Leuven U. ; CERN) ; Köster, U. (Laue-Langevin Inst.) ; Kraev, I.S. (Leuven U.) ; Porobic, T. (Leuven U.) ; Prashanth, P.N. (Leuven U.) et al.
Precision measurements at low energy search for physics beyond the Standard Model in a way complementary to searches for new particles at colliders. In the weak sector the most general $\beta$ decay Hamiltonian contains, besides vector and axial-vector terms, also scalar, tensor and pseudoscalar terms. [...]
arXiv:1409.1824.-
2014-09-25 - 15 p.
- Published in : Phys. Rev. C 90 (2014) 035502
Fulltext: PDF; External link: Preprint
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Performance of Geant4 in simulating semiconductor particle detector response in the energy range below 1 MeV
/ Soti, G. (Leuven U.) ; Wauters, F. (Leuven U.) ; Breitenfeldt, M. (Leuven U.) ; Finlay, P. (Leuven U.) ; Kraev, I.S. (Leuven U.) ; Knecht, A. (CERN ; Leuven U.) ; Porobic, T. (Leuven U.) ; Zákoucký, D. (Rez, Nucl. Phys. Inst.) ; Severijns, N. (Leuven U.)
Geant4 simulations play a crucial role in the analysis and interpretation of experiments providing low energy precision tests of the Standard Model. This paper focuses on the accuracy of the description of the electron processes in the energy range between 100 and 1000 keV. [...]
arXiv:1306.4538.-
2013
- Published in : Nucl. Instrum. Methods Phys. Res., A 728 (2013) 11-22
Fulltext: PDF; External link: Preprint
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Computer controls for the WITCH experiment
/ Tandecki, M (Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Louvain, Belgium.) ; Beck, M (Munster U.) ; Van Gorp, S (Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Louvain, Belgium.) ; Friedag, P (Munster U.) ; De Leebeeck, V (Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Louvain, Belgium.) ; Beck, D (Darmstadt, GSI) ; Brand, H (Darmstadt, GSI) ; Weinheimer, C (Munster U.) ; Breitenfeldt, M (Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Louvain, Belgium.) ; Traykov, E (Katholieke Univ Leuven, Inst Kern & Stralingsfys, B-3001 Louvain, Belgium.) et al.
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 beta decay. [...]
2011
- Published in : Nucl. Instrum. Methods Phys. Res., A 629 (2011) 396-405
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Simbuca, using a graphics card to simulate Coulomb interactions in a penning trap
/ Van Gorp, S (Leuven U.) ; Beck, M (Munster U.) ; Friedag, P (Munster U.) ; De Leebeeck, V (Leuven U.) ; Tandecki, M (Leuven U.) ; Weinheimer, C (Munster U.) ; Breitenfeldt, M (Leuven U.) ; Traykov, E (Leuven U.) ; Severijn, N (Leuven U.) ; Mader, J (Munster U.) et al.
In almost all cases, N-body simulations are limited by the computation time available. Coulomb interaction calculations scale with O(N(2)) with N the number of particles. [...]
2011
- Published in : Nucl. Instrum. Methods Phys. Res., A 638 (2011) 192-200
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9.
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A compact radio frequency quadrupole for ion bunching in the WITCH experiment
/ Traykov, E. (Leuven U.) ; Beck, M. (Munster U.) ; Breitenfeldt, M. (Leuven U.) ; Delahaye, P. (CERN) ; De Leebeeck, V. (Leuven U.) ; Friedag, P. (Munster U.) ; Herlert, A. (CERN) ; Geeraert, N. (Leuven U.) ; Heirman, W. (Leuven U.) ; Lonne, P.I. (Bergen U.) et al.
During the last several years the WITCH (Weak Interaction Trap for CHarged particles) experimental setup at ISOLDE has undergone various upgrades aiming at improvement of general performance. An essential innovation, a compact Radio Frequency Quadrupole (RFQ) ion cooler and buncher device, was designed and successfully commissioned as a part of the off-line tuning system of WITCH. [...]
2011
- Published in : Nucl. Instrum. Methods Phys. Res., A 648 (2011) 1-14
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10.
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Measurement of the $\beta$-asymmetry parameter in the decay of $^{133}$Xe.
/ Soti, G (K. U. Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium) ; Wauters, F (K. U. Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium) ; Breitenfeldt, M (K. U. Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium and CERN, 1211 Geneva, Switzerland) ; Köster, U (Institut Laue Langevin, F-38042 Grenoble Cedex 9) ; De Leebeeck, V (K. U. Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium) ; Roccia, S (K. U. Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium) ; Tandecki, M (K. U. Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium) ; Van Gorp, S (K. U. Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium) ; Zákoucký, D (Nuclear Physics Institute, ASCR, 250 68 Rez, Czech Republic) ; Severijns, N (K. U. Leuven, Instituut voor Kern- en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven, Belgium)
CERN-INTC-2011-014 ; INTC-P-298.
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2011.
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