Beta Decay of 35Ar

1971 ◽  
Vol 49 (6) ◽  
pp. 663-669 ◽  
Author(s):  
J. S. Geiger ◽  
B. W. Hooton
Keyword(s):  
Beta Decay ◽  
Ground State ◽  
Half Life ◽  
Coupling Constant ◽  
Vector Coupling ◽  
Vector Coupling Constant ◽  
Γ Ray ◽  
Gamma Radiations

The gamma radiations from the decay of 35Ar have been studied using Ge(Li) γ-ray detectors. Evidence is found for previously unreported β feeds to the 35Cl levels at 2695 and 3003 keV. The percentage β feeds to 35Cl levels are the following: 0 keV, 98.3 ± 0.2; 1220 keV, 1.22 ± 0.20; 1763 keV, 0.22 ± 0.05; 2695 keV, 0.16 ± 0.04; and 3003 keV, 0.11 ± 0.03. The 35Ar half-life is found to be 1.787 ± 0.012 s. The present results support the findings of Wick et al. that the vector coupling constant determined from the 35Ar ground state beta decay is significantly larger than the values inferred from other super-allowed decays.

scholarly journals Two neutrino double-beta decay and effective axial-vector coupling constant

2018 ◽  
Vol 194 ◽  
pp. 02002
Author(s):  
Fedor Šimkovic ◽  
Rastislav Dvornický ◽  
Dušan Štefánik
Keyword(s):  
Beta Decay ◽  
Axial Vector ◽  
Double Beta Decay ◽  
Matrix Elements ◽  
Coupling Constant ◽  
Vector Coupling ◽  
Majorana Particle ◽  
Vector Coupling Constant ◽  
Novel Approach ◽  
Axial Vector Coupling

The theoretical and experimental study of the two-neutrino double-beta decay (2νββ-decay) is of crucial importance for reliable calculation of matrix elements governing the neutrinoless double-beta decay (0νββ-decay). That will allow to determine masses of neutrinos once the 0νββ-decay, which occurs if the neutrino is a massive Majorana particle and the total lepton number is not onserved, will be observed. Experiments studying the 2νββ-decay are currently approaching a qualitatively new level, where high-precision measurements are performed not only for half-lives but for all other observables of the process. In this context an improved formula for the 2νββ-decay is presented. Further, a novel approach for determining the effective axial-vector coupling constant is proposed.

Magnitude of the vector coupling constant deduced from recent beta decay measurements

1969 ◽  
Vol 30 (4) ◽  
pp. 240-241 ◽  
Author(s):  
J.M. Freeman ◽  
D.C. Robinson ◽  
G.L. Wick
Keyword(s):  
Beta Decay ◽  
Coupling Constant ◽  
Vector Coupling ◽  
Vector Coupling Constant

Accurate Fermi Beta Decay Measurements and the Magnitude of the Weak Interaction Vector Coupling Constant

1972 ◽  
pp. 105-111
Author(s):  
J. M. Freeman ◽  
G. J. Clark ◽  
J. S. Ryder ◽  
W. E. Burcham ◽  
G. T. A. Squier ◽  
...  
Keyword(s):  
Beta Decay ◽  
Weak Interaction ◽  
Coupling Constant ◽  
Vector Coupling ◽  
Vector Coupling Constant

4.—Search for Branching in the β+ Decay of the 42Sc Ground State

1972 ◽  
Vol 70 ◽  
pp. 39-45
Author(s):  
W. E. Burcham ◽  
G. Murray ◽  
D. C. Robinson ◽  
J. M. Freeman ◽  
J. G. Jenkin
Keyword(s):  
Weak Interaction ◽  
Ground State ◽  
Negligible Effect ◽  
Coupling Constant ◽  
Β Decay ◽  
Vector Coupling ◽  
State Decay ◽  
Vector Coupling Constant

SynopsisA search was made for branching to the 1–84 MeV state of 42Ca in the 42Sc ground state decay. This was found to be less than 0·02 per cent. The branching has a negligible effect on the calculation of the vector coupling constant Gv for the weak interaction from the 42Sc decay.

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