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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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First detection and energy measurement of recoil ions following beta decay in a Penning trap with the WITCH experiment
/ Beck, M. (Munster U.) ; Coeck, S. (Leuven U.) ; Kozlov, V.Yu. (KIT, Karlsruhe) ; Breitenfeldt, M. (Leuven U.) ; Delahaye, P. (CERN) ; Friedag, P. (Munster U.) ; Herbane, M. (Leuven U.) ; Herlert, A. (CERN) ; Kraev, I.S. (Leuven U.) ; Mader, J. (Munster U.) et al.
The WITCH experiment (Weak Interaction Trap for CHarged particles) will search for exotic interactions by investigating the beta-neutrino angular correlation via the measurement of the recoil energy spectrum after beta decay. As a first step the recoil ions from the beta-minus decay of 124In stored in a Penning trap have been detected. [...]
arXiv:1008.0207.-
2011 - 9 p.
- Published in : Eur. Phys. J. A 47 (2011) 45
Fulltext: PDF; External link: Preprint
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5.
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Magnetic moment of $^{104}$Ag$^m$ and the hyperfine magnetic field of Ag in Fe using nuclear magnetic resonance on oriented nuclei
/ Golovko, V.V. (Leuven U.) ; Kraev, I.S. (Leuven U.) ; Phalet, T. (Leuven U.) ; Delaure, B. (Leuven U.) ; Beck, M. (Leuven U.) ; Kozlov, V.Yu. (Leuven U.) ; Coeck, S. (Leuven U.) ; Wauters, F. (Leuven U.) ; Herzog, P. (Bonn U., HISKP) ; Tramm, Ch. (Bonn U., HISKP) et al.
Nuclear magnetic resonance (NMR/ON) measurements with beta- and gamma-ray detection have been performed on oriented Ag-104(g,m) nuclei with the NICOLE He-3-He-4 dilution refrigerator setup at ISOLDE/CERN. For Ag-104(g) (I-pi = 5(+)) the gamma-NMR/ON resonance signal was found at nu = 266.70(5) MHz. [...]
arXiv:1006.5885.-
2010 - 12 p.
- Published in : Phys. Rev. C 81 (2010) 054323
APS Published version, local copy: PDF; Fulltext: PDF; External link: Preprint
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6.
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Precision measurements of the $^{60}$Co $\beta$-asymmetry parameter in search for tensor currents in weak interactions
/ Wauters, F (Leuven U.) ; Kraev, I S (Leuven U.) ; Zákoucký, D (Rez, Nucl. Phys. Inst.) ; Beck, M (Leuven U.) ; Breitenfeldt, M (Leuven U.) ; De Leebeeck, V (Leuven U.) ; Golovko, V V (Leuven U.) ; Kozlov, V Yu (Leuven U.) ; Phalet, T (Leuven U.) ; Roccia, S (Leuven U.) et al.
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. [...]
arXiv:1005.5034.-
2010 - 20 p.
- Published in : Phys. Rev. C 82 (2010) 055502
External link: Preprint
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7.
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The WITCH experiment : Acquiring the first recoil ion spectrum
/ Kozlov, V.Yu. (Leuven U.) ; Beck, M. (Munster U.) ; Coeck, S. (Leuven U.) ; Delahaye, P. (CERN) ; Friedag, P. (Munster U.) ; Herbane, M. (Leuven U.) ; Herlert, A. (CERN) ; Kraev, I.S. (Leuven U.) ; Tandecki, M. (Leuven U.) ; Van Gorp, S. (Leuven U.) et al.
The standard model of the electroweak interaction describes beta-decay in the well-known V-A form. Nevertheless, the most general Hamiltonian of a beta-decay includes also other possible interaction types, e.g. [...]
arXiv:0807.3421.-
2008 - 11 p.
- Published in : Nucl. Instrum. Methods Phys. Res., B 266 (2008) 4515-4520
Fulltext: PDF; External link: Preprint
In : 15th International Conference on Electromagnetic Isotope Separators and Techiques Related to their Applications, Deauville, France, 24 - 29 Jun 2007, pp.4515-4520
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8.
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Ab initio simulations on the behavior of small ion clouds in the WITCH Penning trap system
/ Coeck, S ; Delauré, B ; Herbane, M ; Kozlov, V Yu ; Kraev, I S ; Tandecki, M ; Wauters, F ; Beck, M ; Delahaye, P (CERN) ; Herlert, A (CERN) et al.
Various ab initio simulations on the behavior of ion clouds consisting of a small number of positively charged ions stored in the WITCH double Penning trap system are described. A general description of the simulation code used is presented and the expected behavior of the particles in the first of the two Penning traps is discussed. [...]
2007
- Published in : Nucl. Instrum. Methods Phys. Res., A 574 (2007) 370-384
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Confirmation of parity violation in the $\gamma$ decay of $^{180}$Hf$^{m}$
/ Stone, J.R. (Oxford U., Ctr. Quantum Comp. ; Maryland U., Dept. Chem.) ; Goldring, G. (Weizmann Inst.) ; Stone, N.J. (Oxford U., Ctr. Quantum Comp. ; Tennessee U.) ; Severijns, N. (Leuven U.) ; Hass, M. (Weizmann Inst.) ; Zakoucky, D. (Rez, Nucl. Phys. Inst.) ; Giles, T. (CERN) ; Koster, U. (Laue-Langevin Inst. ; CERN) ; Kraev, I.S. (Leuven U.) ; Lakshmi, S. (Weizmann Inst.) et al.
This paper reports measurements using the technique of On Line Nuclear Orientation (OLNO) which reexamine the gamma decay of isomeric $^{\rm 180}$Hf$^{\rm m}$ and specifically the 501 keV 8$^{\rm -}$ -- 6$^{\rm +}$ transition. The irregular admixture of E2 to M2/E3 multipolarity in this transition, deduced from the forward-backward asymmetry of its angular distribution, has for decades stood as the prime evidence for parity mixing in nuclear states. [...]
arXiv:0707.1061.-
2007 - 28 p.
- Published in : Phys. Rev. C 76 (2007) 025502
APS Published version, local copy: PDF; Fulltext: PDF; External link: Fulltext
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