The decay of 20Na: Measurements of isospin mixing and the weak vector coupling constant as well as other new decay data
1989; Elsevier BV; Volume: 493; Issue: 2 Linguagem: Inglês
10.1016/0375-9474(89)90399-0
ISSN1873-1554
AutoresE. T. H. Clifford, E. Hagberg, J. C. Hardy, H. Schmeing, R.E. Azuma, H. C. Evans, V.T. Koslowsky, U.J. Schrewe, K. S. Sharma, I.S. Towner,
Tópico(s)Particle physics theoretical and experimental studies
ResumoKinematic shifts of α particles from the β+ delayed α decay of 20Na have been measured as a function of the energy of the coincident β+ particles. Beta-neutrino-alpha triple-correlation coefficients were determined for six β+ transitions from 20Na(Jπ, T = 2+, 1) to excited 2+ states in 20Ne; ft values were also deduced. For the superallowed 2+ → 2+ transition to the T = 1 analogue state in 20Ne the results yielded a measurement of the vector weak coupling constant, G'V/(c)3 = (1.103±0.028) × 10−5GeV−2. For the other five (allowed Gamow-Teller) transitions, limits were established for the vector (Fermi) component and, from them, limits deduced on isospin mixing amplitudes for the daughter states in 20Ne. Weak, previously unknown, β-transitions were assigned to the decay of 20Na based on the observation of new α groups and one new γ-transition.
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