G. Zsigmond
Paul Scherrer Institute
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Featured researches published by G. Zsigmond.
Physical Review D | 2015
J.M. Pendlebury; S. Afach; N. J. Ayres; C. A. Baker; G. Ban; Georg Bison; K. Bodek; Martin Burghoff; P. Geltenbort; K. Green; W. C. Griffith; M. G. D. van der Grinten; Zoran D. Grujić; P. Harris; V. Hélaine; P. Iaydjiev; S.N. Ivanov; M. Kasprzak; Y. Kermaidic; K. Kirch; H.-C. Koch; S. Komposch; A. Kozela; J. Krempel; B. Lauss; T. Lefort; Y. Lemière; D. J. R. May; M. Musgrave; O. Naviliat-Cuncic
We present for the first time a detailed and comprehensive analysis of the experimental results that set the current world sensitivity limit on the magnitude of the electric dipole moment (EDM) of the neutron. We have extended and enhanced our earlier analysis to include recent developments in the understanding of the effects of gravity in depolarizing ultracold neutrons; an improved calculation of the spectrum of the neutrons; and conservative estimates of other possible systematic errors, which are also shown to be consistent with more recent measurements undertaken with the apparatus. We obtain a net result of dn=−0.21±1.82×10−26 e cm, which may be interpreted as a slightly revised upper limit on the magnitude of the EDM of 3.0×10−26 e cm (90% C.L.) or 3.6×10−26 e cm (95% C.L.).
Neutron News | 2002
G. Zsigmond; K. Lieutenant; Ferenc Mezei
Abstract Analytical approaches have a limited role to play in complex experimental situations, such as neutron scattering. Even if most individual instrument components can be precisely described by analytical models, the integration of a large number of such components in an instrument makes analytical processes highly inefficient and time consuming. Monte Carlo (MC) simulation offers an efficient solution for achieving this goal, both in terms of computational time and the time invested by researchers, given that powerful program packages, such as VITESS, are available [l]. The VITESS [2] sub-project was implemented at HMI within the framework of the German HGF strategy fund project “Research and Development for the European Spallation Source (ESS),” as part of the ESS-Instrumentation activity. This project aims to improve and extend the efficiency of instruments in all fields of research with neutron beams, especially those on spallation sources. For the design and construction of high performance instruments, an efficient computer program has been developed which allows for simulation of the neutron flight from the targevmoderator to the detector.
Physical Review Letters | 2009
I. Altarev; C.A. Baker; G. Ban; Georg Bison; K. Bodek; M. Daum; P. Fierlinger; P. Geltenbort; K. Green; M. G. D. van der Grinten; E. Gutsmiedl; P. Harris; W. Heil; R. Henneck; M. Horras; P. Iaydjiev; S.N. Ivanov; N. V. Khomutov; K. Kirch; St. Kistryn; A. Knecht; Paul E. Knowles; A. Kozela; F. Kuchler; M. Kuźniak; T. Lauer; B. Lauss; T. Lefort; A. Mtchedlishvili; O. Naviliat-Cuncic
A clock comparison experiment, analyzing the ratio of spin precession frequencies of stored ultracold neutrons and 199Hg atoms, is reported. No daily variation of this ratio could be found, from which is set an upper limit on the Lorentz invariance violating cosmic anisotropy field b perpendicular < 2 x 10(-20) eV (95% C.L.). This is the first limit for the free neutron. This result is also interpreted as a direct limit on the gravitational dipole moment of the neutron |gn| < 0.3 eV/c2 m from a spin-dependent interaction with the Sun. Analyzing the gravitational interaction with the Earth, based on previous data, yields a more stringent limit |gn| < 3 x 10(-4) eV/c2 m.
Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2009
I. Altarev; G. Ban; Georg Bison; K. Bodek; Martin Burghoff; Milan Cvijovic; M. Daum; P. Fierlinger; E. Gutsmiedl; Gabriele Hampel; W. Heil; R. Henneck; M. Horras; N. V. Khomutov; K. Kirch; St. Kistryn; S. Knappe-Grüneberg; A. Knecht; Paul E. Knowles; A. Kozela; J. V. Kratz; F. Kuchler; M. Kuźniak; T. Lauer; B. Lauss; T. Lefort; A. Mtchedlishvili; O. Naviliat-Cuncic; S. Paul; A. S. Pazgalev
The effort towards a new measurement of the neutron electric dipole moment (nEDM) at the Paul Scherrer Instituts (PSI) new high intensity source of ultracold neutrons (UCN) is described. The experimental technique relies on Ramseys method of separated oscillatory fields, using UCN in vacuum with the apparatus at ambient temperature. In the first phase, R&D towards the upgrade of the RAL/Sussex/ILL apparatus is being performed at the Institut Laue-Langevin (ILL). In the second phase the apparatus, moved from ILL to PSI, will allow an improvement in experimental sensitivity by a factor of 5. In the third phase, a new spectrometer should gain another order of magnitude in sensitivity. The improvements will be mainly due to (1) much higher UCN intensity, (2) improved magnetometry and magnetic field control, and (3) a double chamber configuration with opposite electric field directions.
Journal of Neutron Research | 2008
K. Lefmann; Peter Kjær Willendrup; Linda Udby; Bente Lebech; Kell Mortensen; Jonas Okkels Birk; Kaspar Hewitt Klenø; Erik Knudsen; P. Christiansen; Jan Šaroun; J. Kulda; Uwe Filges; M. Konnecke; Philip L. W. Tregenna-Piggott; Judith Peters; K. Lieutenant; G. Zsigmond; Phillip M. Bentley; Emmanuel Farhi
We define a virtual neutron experiment as a complete simulation of an experiment, from source over sample to detector. The virtual experiment (VE) will ideally interface with the instrument control software for the input and with standard data analysis packages for the virtual data output. Virtual experiments are beginning to make their way into neutron scattering science with applications as diverse as instrument design/upgrade, experiment planning, data analysis, test of analysis software, teaching, and outreach. In this paper, we summarize the recent developments in this field and make suggestions for future developments and use of VEs.
Physics Letters B | 2014
S. Afach; C. A. Baker; G. Ban; Georg Bison; K. Bodek; M. Burghoff; Z. Chowdhuri; M. Daum; M. Fertl; B. Franke; P. Geltenbort; K. Green; M. G. D. van der Grinten; Zoran D. Grujić; P. Harris; W. Heil; V. Hélaine; R. Henneck; M. Horras; P. Iaydjiev; S.N. Ivanov; M. Kasprzak; Y. Kermaidic; K. Kirch; A. Knecht; H.-C. Koch; J. Krempel; M. Kuźniak; B. Lauss; T. Lefort
The neutron gyromagnetic ratio has been measured relative to that of the 199Hg atom with an uncertainty of 0.8 ppm. We employed an apparatus where ultracold neutrons and mercury atoms are stored in the same volume and report the result γn/γHg=3.8424574(30).
Journal of Applied Physics | 2014
S. Afach; Georg Bison; K. Bodek; F. Burri; Z. Chowdhuri; M. Daum; M. Fertl; B. Franke; Zoran D. Grujić; V. Hélaine; R. Henneck; M. Kasprzak; K. Kirch; H.-C. Koch; A. Kozela; J. Krempel; B. Lauss; T. Lefort; Y. Lemière; M. Meier; O. Naviliat-Cuncic; F. M. Piegsa; G. Pignol; C. Plonka-Spehr; P. N. Prashanth; G. Quéméner; D. Rebreyend; S. Roccia; P. Schmidt-Wellenburg; A. Schnabel
The Surrounding Field Compensation (SFC) system described in this work is installed around the four-layer Mu-metal magnetic shield of the neutron electric dipole moment spectrometer located at the Paul Scherrer Institute. The SFC system reduces the DC component of the external magnetic field by a factor of about 20. Within a control volume of approximately 2.5m x 2.5m x 3m disturbances of the magnetic field are attenuated by factors of 5 to 50 at a bandwidth from
Physics Letters B | 2015
S. Afach; G. Ban; Georg Bison; K. Bodek; Martin Burghoff; M. Daum; M. Fertl; B. Franke; Zoran D. Grujić; V. Hélaine; M. Kasprzak; Y. Kermaidic; K. Kirch; Paul E. Knowles; H.-C. Koch; S. Komposch; A. Kozela; J. Krempel; B. Lauss; T. Lefort; Y. Lemière; A. Mtchedlishvili; O. Naviliat-Cuncic; F. M. Piegsa; G. Pignol; P. N. Prashanth; G. Quéméner; D. Rebreyend; D. Ries; S. Roccia
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Nuclear Physics News | 2010
K. Kirch; B. Lauss; P. Schmidt-Wellenburg; G. Zsigmond
Hz up to 0.5 Hz, which corresponds to integration times longer than several hundreds of seconds and represent the important timescale for the nEDM measurement. These shielding factors apply to random environmental noise from arbitrary sources. This is achieved via a proportional-integral feedback stabilization system that includes a regularized pseudoinverse matrix of proportionality factors which correlates magnetic field changes at all sensor positions to current changes in the SFC coils.
Physical Review Letters | 2015
S. Afach; N. J. Ayres; G. Ban; Georg Bison; K. Bodek; Z. Chowdhuri; M. Daum; M. Fertl; B. Franke; W. C. Griffith; Zoran D. Grujić; P. Harris; W. Heil; V. Hélaine; M. Kasprzak; Y. Kermaidic; K. Kirch; Paul E. Knowles; H.-C. Koch; S. Komposch; A. Kozela; J. Krempel; B. Lauss; T. Lefort; Y. Lemière; A. Mtchedlishvili; M. Musgrave; O. Naviliat-Cuncic; J.M. Pendlebury; F. M. Piegsa
We report a new limit on a possible short range spin-dependent interaction from the precise measurement of the ratio of Larmor precession frequencies of stored ultracold neutrons and Hg-199 atoms confined in the same volume. The measurement was performed in a similar to 1 mu T vertical magnetic holding field with the apparatus searching for a permanent electric dipole moment of the neutron at the Paul Scherrer Institute. A possible coupling between freely precessing polarized neutron spins and unpolarized nucleons of the wall material can be investigated by searching for a tiny change of the precession frequencies of neutron and mercury spins. Such a frequency change can be interpreted as a consequence of a short range spin-dependent interaction that could possibly be mediated by axions or axion-like particles. The interaction strength is proportional to the CP violating product of scalar and pseudoscalar coupling constants g(S)g(P). Our result confirms limits from complementary experiments with spin-polarized nuclei in a model-independent way. Limits from other neutron experiments are improved by up to two orders of magnitude in the interaction range of 10(-6) < lambda < 10(-4) m