The beta decay asymmetry parameter of /sup 35/Ar

Technical Report · Sun Nov 01 04:00:00 EST 1987

DOI:https://doi.org/10.2172/5582089· OSTI ID:5582089

Garnett, J D

The beta decay asymmetry parameter for /sup 35/Ar = /sup 35/Cl + e/sup +/ + nu/sub e/ has been remeasured in order to resolve a long standing puzzle. Previous asymmetry measurements, when combined with the comparative half-life, yield a value for the vector coupling constant, G/sub v/, that is in serious disagreement with the accepted value. We produced polarized /sup 35/Ar by a (p,n) reaction on /sup 35/Cl using the polarized proton beam provided by Lawrence Berkeley Laboratory's 88-Inch Cyclotron. The polarization of the /sup 35/Ar was determined by measuring the asymmetry of the positrons produced in /sup 35/Ar decay to the first excited state in /sup 35/Cl (branching ratio = 1.3%) in coincidence with a 1219.4 keV gamma ray. Our result, A/sub 0/ = 0.49 +- 0.10, combined with the comparative half-life yields a value for G/sub v/ in agreement with the accepted value.

• Research Organization: Lawrence Berkeley Lab., CA (USA)
• DOE Contract Number: AC03-76SF00098
• OSTI ID: 5582089
• Report Number(s): LBL-24217; ON: DE88003859
• Country of Publication: United States
• Language: English

Related Subjects

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A=20-38
Experimental
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
73 NUCLEAR PHYSICS AND RADIATION PHYSICS
ARGON 35
ARGON ISOTOPES
ASYMMETRY
BACKSCATTERING
BARYON REACTIONS
BEAMS
BETA DECAY
BETA DECAY RADIOISOTOPES
BETA-PLUS DECAY RADIOISOTOPES
BRANCHING RATIO
CALIBRATION
CHARGED-PARTICLE REACTIONS
CHLORINE 35 TARGET
COINCIDENCE METHODS
COUNTING TECHNIQUES
CVC THEORY
DATA
DECAY
ELECTROMAGNETIC RADIATION
ENERGY DEPENDENCE
EVEN-ODD NUCLEI
EXPERIMENTAL DATA
GAMMA RADIATION
GE SEMICONDUCTOR DETECTORS
HADRON REACTIONS
HALF-LIFE
INFORMATION
IONIZING RADIATIONS
ISOTOPES
LIGHT NUCLEI
MEASURING INSTRUMENTS
NUCLEAR REACTIONS
NUCLEI
NUCLEON REACTIONS
NUMERICAL DATA
PLASTIC SCINTILLATION DETECTORS
POLARIZED BEAMS
POLARIZED TARGETS
PROTON REACTIONS
RADIATION DETECTORS
RADIATIONS
RADIOISOTOPES
SCATTERING
SCINTILLATION COUNTERS
SECONDS LIVING RADIOISOTOPES
SEMICONDUCTOR DETECTORS
SOLID SCINTILLATION DETECTORS
TARGETS