Precision measurements of the {sup 60}Co {beta}-asymmetry parameter in search for tensor currents in weak interactions

Journal Article · Mon Nov 15 00:00:00 EST 2010 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.82.055502· OSTI ID:21499216

Wauters, F; Kraev, I; Beck, M; Breitenfeldt, M; De Leebeeck, V; Golovko, V V; Kozlov, V Yu; Phalet, T; Roccia, S; Soti, G; Tandecki, M; Traykov, E; Van Gorp, S; Severijns, N ^[1]; Zakoucky, D ^[2]; Towner, I S ^[3]

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1. K. U. Leuven, Instituut voor Kern-en Stralingsfysica, Celestijnenlaan 200D, B-3001 Leuven (Belgium)
2. Nuclear Physics Institute, ASCR, CZ-250 68 Rez (Czech Republic)
3. Cyclotron Institute, Texas A and M University, College Station, Texas 77845 (United States)

The {beta}-asymmetry parameter A-tilde for the Gamow-Teller decay of {sup 60}Co was measured by polarizing the radioactive nuclei with the brute-force low-temperature nuclear-orientation method. The {sup 60}Co activity was cooled down to milliKelvin temperatures in a {sup 3}He-{sup 4}He 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-tilde=-1.014(12){sub stat}(16){sub 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.

• OSTI ID: 21499216
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 82, Issue 5; Other Information: DOI: 10.1103/PhysRevC.82.055502; (c) 2010 The American Physical Society; ISSN 0556-2813
• Country of Publication: United States
• Language: English

Related Subjects

73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ACCURACY
ASYMMETRY
BETA PARTICLES
COBALT 60
COMPUTERIZED SIMULATION
CORRECTIONS
GAIN
GAMOW-TELLER RULES
HELIUM 3
HELIUM 4
MAGNETIC FIELDS
MONTE CARLO METHOD
NUCLEAR DECAY
RECOILS
STANDARD MODEL
TEMPERATURE RANGE 0000-0013 K
WEAK INTERACTIONS
AMPLIFICATION
BASIC INTERACTIONS
BETA DECAY RADIOISOTOPES
BETA-MINUS DECAY RADIOISOTOPES
CALCULATION METHODS
CHARGED PARTICLES
COBALT ISOTOPES
DECAY
EVEN-EVEN NUCLEI
EVEN-ODD NUCLEI
FIELD THEORIES
GRAND UNIFIED THEORY
HELIUM ISOTOPES
INTERACTIONS
INTERMEDIATE MASS NUCLEI
INTERNAL CONVERSION RADIOISOTOPES
IONIZING RADIATIONS
ISOMERIC TRANSITION ISOTOPES
ISOTOPES
LIGHT NUCLEI
MATHEMATICAL MODELS
MINUTES LIVING RADIOISOTOPES
NUCLEI
ODD-ODD NUCLEI
PARTICLE MODELS
QUANTUM FIELD THEORY
RADIATIONS
RADIOISOTOPES
SIMULATION
STABLE ISOTOPES
TEMPERATURE RANGE
UNIFIED GAUGE MODELS
YEARS LIVING RADIOISOTOPES