Journal
PHYSICAL REVIEW C
Volume 82, Issue 5, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevC.82.055502
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Funding
- K. U. Leuven [GOA/2004/03]
- Belgian State Belgian Science Policy [P6/23]
- Ministry of Education of the Czech Republic [LA08015]
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The beta-asymmetry parameter (A) over tilde for the Gamow-Teller decay of Co-60 was measured by polarizing the radioactive nuclei with the brute-force low-temperature nuclear-orientation method. The Co-60 activity was cooled down to milliKelvin temperatures in a He-3-He-4 dilution refrigerator in an external 13-T magnetic field. The beta particles were observed by a 500-mu m-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) over tilde = -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.
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