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Title: Precision measurements of the Co-60 beta-asymmetry parameter in search for tensor currents in weak interactions
Authors: Wauters, Frederik ×
Kraev, I.
Beck, M.
Breitenfeldt, Martin
De Leebeeck, V.
Golovko, V.V.
Kozlov, Yu.V.
Phalet, T.
Roccia, S.
Soti, Gergelj
Tandecki, M.
Towner, I.S.
Traykov, E.
Van Gorp, Simon
Severijns, Nathal #
Issue Date: 18-Nov-2010
Publisher: Published for the American Physical Society by the American Institute of Physics
Series Title: Physical Review C, Nuclear Physics vol:82 issue:5
Article number: 055502
Abstract: The β-asymmetry parameter Afor the Gamow-Teller decay of 60Cowasmeasured by polarizing the radioactive
nuclei with the brute-force low-temperature nuclear-orientation method. The 60Co activity was cooled down to
milliKelvin temperatures in a 3He-4He dilution refrigerator in an external 13-T magnetic field. The β particles
were observed by a 500-μm-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, 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.
ISSN: 0556-2813
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Nuclear and Radiation Physics Section
× corresponding author
# (joint) last author

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