Note on the β-circularly polarized γ-angular correlations in the decays of 46Sc and 58Co

Abstract

The β-γ circular polarization correlations of the (357 keV, 4 + → 4 +, β −) − (1.121 + 0.889 MeV, γ) cascade in 46Sc and the (475 keV, 2 + → 2 +, β +) − (0.810 MeV, γ) in 58Co have been measured by using the standard forward scattering technique for the detection of circular polarization of γ-rays. The energy selection of the β-rays was performed with a magnetic lens spectrometer. The measured asymmetry coefficients, Fermi to Gamow-Teller matrix element ratios, values of the Fermi matrix elements, isospin impurity coefficients and the effective Coulomb matrix elements are as follows: A =M F/M GT |M F| × 10 3 |α| × 10 3 |〈H C〉|keV 46Sc 0.06±0.03 0.03±0.04 1.9±2.5 0.95±1.25 6.7±10 58Co 0.18±0.04 0.02±0.05 0.7±1.8 0.3 ±0.7 1.8± 4.7