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46 results on '"Vereecke, B."'

9. WITCH: a recoil spectrometer for β-decay

Author

Beck, M., Ames, F., Beck, D., Bollen, G., Delauré, B., Deutsch, J., Golovko, V.V., Kozlov, V.Yu., Kraev, I.S., Lindroth, A., Phalet, T., Quint, W., Reisinger, K., Schuurmans, P., Severijns, N., Vereecke, B., and Versyck, S.

Published
2003
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13. Isospin mixing in the T = 5/2 ground state of $^{71}\!$As

Author

Severijns, N, Vénos, D, Schuurmans, P, Phalet, T, Honusek, M, Srnka, D, Vereecke, B, Versyck, S, Zákoucký, D, Köster, U, Beck, M, Delauré, B J, Golovko, V, and Kraev, I S

Subjects
Nuclear Theory, Nuclear Physics - Experiment, Nuclear Experiment
Abstract

The presence of isospin mixing in the T = 5/2 ground state of $^{71}\!$As was studied via anisotropic positron emission from oriented nuclei. A small isospin-forbidden Fermi component in the predominantly Gamow-Teller $\beta$-decay was established, corresponding to an isospin mixing probability of (13 $\pm$ 4) $\!\times\!$10$^{-6}$. The sign of the magnetic moment of $^{71}\!$As was determined to be positive.

Published
2005

17. Isospin mixing in N$\approx$Z nuclei

Author

Schuurmans, P, Beck, D, Beck, M, Delauré, B J, Phalet, T, Severijns, N, Srnka, D, Vénos, D, Vereecke, B, Versyck, S, and Zakoucky, D

Subjects
Detectors and Experimental Techniques
Published
1999

19. Search for physics beyond the standard model via a polarization-asymmetry correlation experiment on In-107

Author

Vereecke, B., Camps, J., Severijns, N., Otto, T., Brown, B.Alex, Holstein, B., Kirchner, R., Naviliat-Cuncic, O., Quin, P.A., Thomas, E., De Moor, P., Schuurmans, P., Van Geert, A., Vanneste, L., Deutsch, Jules, Govaerts, Jan, Prieels, René, 25th Mazurian Lakes School of Physics: Topics in Nuclear Physics: Symmetries in Micro and Macro Worlds, and UCL - SC/PHYS - Département de physique

Published
1998

22. WITCH: A Penning trap retardation spectrometer combination for precision studies of the weak interaction

Author

UCL - Autre, Delaure, B., Beck, M., Golovko, VV, Kozlov, V, Phalet, T., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., Beck, D., Quint, W, Ames, F., Reisinger, K, Forstner, O, Deutsch, Jules, Bollen, G., Schwarz, S, UCL - Autre, Delaure, B., Beck, M., Golovko, VV, Kozlov, V, Phalet, T., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., Beck, D., Quint, W, Ames, F., Reisinger, K, Forstner, O, Deutsch, Jules, Bollen, G., and Schwarz, S

Abstract

The Weak Interaction Trap for CHarged particles (WITCH) setup is being installed at the ISOLDE-facility (CERN) to test the Standard Model of the electroweak interaction. This will be done by searching for scalar and tensor admixtures in nuclear beta decay. The beta-neutrino angular correlation is an excellent probe to determine the possible strength of those non-Standard Model contributions. The WITCH setup combines the unique storage features of a Penning trap to produce a scattering free radioactive source with a retardation spectrometer to measure the recoil energy spectrum of the daughter nuclei after beta decay with high precision. Physics beyond the Standard Model would lead to deviations from the expected spectral shape.

Published
2003

23. WITCH: a recoil spectrometer for beta-decay

Author

UCL - Autre, Beck, M., Ames, F., Beck, D., Bollen, G., Delaure, B., Deutsch, Jules, Golovko, VV, Kozlov, VY, Kraev, IS, Lindroth, A, Phalet, T., Quint, W, Reisinger, K, Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., 14th International Conference on Electromagnetic Isotope Separators and Techniques Related the their Applications, UCL - Autre, Beck, M., Ames, F., Beck, D., Bollen, G., Delaure, B., Deutsch, Jules, Golovko, VV, Kozlov, VY, Kraev, IS, Lindroth, A, Phalet, T., Quint, W, Reisinger, K, Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., and 14th International Conference on Electromagnetic Isotope Separators and Techniques Related the their Applications

Abstract

The WITCH experiment will measure the recoil energy spectrum of the daughter ions in beta-decay. The main parts of the experiment are two Penning traps and a subsequent retardation spectrometer. The beta-decays take place in the ion cloud in the decay trap. Since the ion cloud is in vacuum and due to the cylindrical structure of the trap, the recoiling daughter ions can leave the cloud and the trap without any significant energy loss and can be energy analyzed in the retardation spectrometer. The WITCH experiment is set up foremost to study the electroweak interaction by measuring the beta-v angular correlation in nuclear beta-decay which can be inferred from the shape of the energy spectrum of the recoil ions. In the beginning the experiment will focus on pure Fermi decays which will allow to search for additional scalar coupling in the weak interaction. Since Penning traps have no restrictions regarding the element to be trapped the most suitable isotope can be picked for this purpose. The WITCH experiment is presently being set up at ISOLDE. Status and perspectives of the experiment will be presented in the following. (C) 2002 Elsevier Science B.V. All rights reserved.

Published
2003

25. A novel approach for measuring the beta neutrino angular correlation in nuclear beta decay

Author

UCL - SC/PHYS - Département de physique, Beck, M., Beck, D., Delaure, B., Phalet, T., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., Ames, F., Schmidt, P., Bollen, G., Forstner, O., Dilling, J., Quint, W., Deutsch, Jules, Prieels, René, 7th International Symposium on Particles, Strings and Cosmology (PASCOS 99) 7th Conference on Intersections Between Particle and Nuclear Physics (CIPANP 2000), UCL - SC/PHYS - Département de physique, Beck, M., Beck, D., Delaure, B., Phalet, T., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., Ames, F., Schmidt, P., Bollen, G., Forstner, O., Dilling, J., Quint, W., Deutsch, Jules, Prieels, René, and 7th International Symposium on Particles, Strings and Cosmology (PASCOS 99) 7th Conference on Intersections Between Particle and Nuclear Physics (CIPANP 2000)

Published
2002

26. Search for right-handed currents in the beta+ decay of Sb-118

Author

UCL - SC/PHYS - Département de physique, Vereecke, B., Beck, D., Beck, M., Delaure, B., Phalet, T., Schuurmans, P., Severijns, N., Versyck, S., Deutsch, Jules, Prieels, René, 7th Conference on Intersections Between Particle and Nuclear Physics (CIPANP 2000), UCL - SC/PHYS - Département de physique, Vereecke, B., Beck, D., Beck, M., Delaure, B., Phalet, T., Schuurmans, P., Severijns, N., Versyck, S., Deutsch, Jules, Prieels, René, and 7th Conference on Intersections Between Particle and Nuclear Physics (CIPANP 2000)

Published
2002

27. Search for new physics in beta-neutrino correlations with the WITCH spectrometer

Author

UCL - SC/PHYS - Département de physique, Beck, D., Ames, F., Beck, M., Bollen, G., Delaure, B., Deutsch, Jules, Dilling, J., Forstner, O, Phalet, T., Prieels, René, Quint, W, Schmidt, P., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., 5th International Conference on Radioactive Nuclear Beams, UCL - SC/PHYS - Département de physique, Beck, D., Ames, F., Beck, M., Bollen, G., Delaure, B., Deutsch, Jules, Dilling, J., Forstner, O, Phalet, T., Prieels, René, Quint, W, Schmidt, P., Schuurmans, P., Severijns, N., Vereecke, B., Versyck, S., and 5th International Conference on Radioactive Nuclear Beams

Abstract

The WITCH (Weak Interaction Trap for CHarged particles) experiment is a retardation spectrometer coupled to a Penning trap and measures the beta-neutrino angular correlation via the shape of the recoil energy spectrum. The present form of the Standard Model describes weak processes in terms of vector and axial-vector type interactions, but the possible presence of scalar and tensor interactions is not yet ruled out. The main aim of this experiment is a test of the Standard Model for possible admixture of scalar and tensor currents. (C) 2002 Elsevier Science B.V. All rights reserved.

Published
2002

28. Fundamental weak interaction studies using polarised nuclei and ion traps

Author

UCL - SC/PHYS - Département de physique, Severijns, N., Deutsch, Jules, Beck, D., Beck, M., Delaure, B., Phalet, T., Prieels, René, Schuurmans, P., Vereecke, B., Versyck, S., UCL - SC/PHYS - Département de physique, Severijns, N., Deutsch, Jules, Beck, D., Beck, M., Delaure, B., Phalet, T., Prieels, René, Schuurmans, P., Vereecke, B., and Versyck, S.

Abstract

Two experiments to search for new physics beyond the standard model for electroweak interactions by measuring correlations between different spin and momentum vectors in nuclear beta -decay are discussed. In the first experiment the correlation between the emission asymmetry and the longitudinal polarisation of positrons emitted by polarised nuclei is determined. This type of measurement is sensitive to the presence of right-handed currents but also to possible scalar and tensor-type currents in the weak interaction. The aim of the second experiment is to determine the beta nu -correlation in beta -decay by measuring the energy spectrum of the recoil ions, using a Penning trap and a retardation spectrometer. In this case the focus is on the search for scalar currents in the weak interaction. The results of the experiments presented here are complementary to results from experiments in muon decay and at high-energy colliders.

Published
2000

29. Isospin mixing in theT=5/2ground state ofAs71

Author

Severijns, N., primary, Vénos, D., additional, Schuurmans, P., additional, Phalet, T., additional, Honusek, M., additional, Srnka, D., additional, Vereecke, B., additional, Versyck, S., additional, Zákoucký, D., additional, Köster, U., additional, Beck, M., additional, Delauré, B., additional, Golovko, V., additional, and Kraev, I., additional

Published
2005
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31. WITCH: A Penning Trap Retardation Spectrometer Combination for Precision Studies of the Weak Interaction

Author

Delauré, B., primary, Beck, M., additional, Golovko, V. V., additional, Kozlov, V., additional, Phalet, T., additional, Schuurmans, P., additional, Severijns, N., additional, Vereecke, B., additional, Versyck, S., additional, Beck, D., additional, Quint, W., additional, Ames, F., additional, Reisinger, K., additional, Forstner, O., additional, Deutsch, J., additional, Bollen, G., additional, and Schwarz, S., additional

Published
2003
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32. Search for new physics in beta-neutrino correlations with the WITCH spectrometer

Author

Beck, D., primary, Ames, F., additional, Beck, M., additional, Bollen, G., additional, Delauré, B., additional, Deutsch, J., additional, Dilling, J., additional, Forstner, O., additional, Phalet, T., additional, Prieels, R., additional, Quint, W., additional, Schmidt, P., additional, Schuurmans, P., additional, Severijns, N., additional, Vereecke, B., additional, and Versyck, S., additional

Published
2002
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34. A novel approach for measuring the beta-neutrino angular correlation in nuclear beta decay.

Author

Beck, M., Ames, F., Beck, D., Delaure´, B., Deutsch, J., Bollen, G., Forstner, O., Phalet, T., Quint, W., Schmidt, P., Schuurmans, P., Severijns, N., Vereecke, B., and Versyck, S.

Subjects
NEUTRINOS, BETA decay
Abstract

The experiment described here will search for deviations from the V-A structure of the standard electroweak model. It is based on measuring the recoil energy spectrum in nuclear beta decay which is determined by the etectron-neutrino angular corretation. For pure Fermi decays this is exactly known in the standard model and any deviation will point to additional scalar interaction. The experiment consists of a Penning trap coupled to a retardation spectrometer to measure the energy of the recoiling daughter nuclei. The current status will be presented. [ABSTRACT FROM AUTHOR]

Published
2000

37. α particle angular distributions of189,191,193Bi

Author

Krause, J., primary, Berkes, I., additional, Camps, J., additional, De Jesus, M., additional, De Moor, P., additional, Herzog, P., additional, Massaq, M., additional, Phalet, T., additional, Schuurmans, P., additional, Severijns, N., additional, Van Geert, A., additional, Venos, D., additional, Vereecke, B., additional, Will, B., additional, and Zakoucky, D., additional

Published
1998
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38. Helicity structure in low- and intermediate-energy weak interaction

Author

Severijns, N., primary, Allet, M., additional, Bodek, K., additional, Brown, B.A., additional, Camps, J., additional, De Moor, P., additional, Deutsch, J., additional, Ferro-Luzzi, M., additional, Gimeno-Nogues, F., additional, Govaerts, J., additional, Holstein, B.R., additional, Kirchner, R., additional, Lang, J., additional, Müller, R., additional, Navert, S., additional, Naviliat-Cuncic, O., additional, Otto, T., additional, Pepe, I., additional, Prieels, R., additional, Quin, P.A., additional, Schuurmans, P., additional, Sromicki, J., additional, Stephan, E., additional, Thomas, E., additional, Van Geert, A., additional, Vanneste, L., additional, Vereecke, B., additional, and Zejma, J., additional

Published
1998
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39. Search for physics beyond the standard model via a polarization-asymmetry correlation experiment on

Author

Schuurmans, P., primary, Camps, J., additional, Severijns, N., additional, De Moor, P., additional, Deutsch, J., additional, Otto, T., additional, Govaerts, J., additional, Brown, B. A., additional, Holstein, B., additional, Kirchner, R., additional, Naviliat-Cunic, O., additional, Prieels, R., additional, Quin, P. A., additional, Thomas, E., additional, Van Geert, A., additional, Vereecke, B., additional, and Vanneste, L., additional

Published
1997
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43. Search for right-handed currents in the β[sup +]-decay of [sup 118]Sb.

Author

Vereecke, B., Beck, D., Beck, M., Delaure´, B., Phalet, T., Schuurmans, P., Severijns, N., Versyck, S., Deutsch, J., and Prieels, R.

Subjects
*BETA decay, *POSITRONS, *POLARIZATION (Nuclear physics)
Abstract

We report on a recent experiment searching for right-handed currents in the [sup 118]Sb nuclear β-decay. The correlation between the spin polarization and the βemission asymmetry of the positrons from the [sup 118]Sb decay is sensitive to the helicity structure of the weak interaction. A precision measurement of this correlation improves the limit on right-handed currents in β-decay. [ABSTRACT FROM AUTHOR]

Published
2000

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