Abstract
Abstract The branching ratio for the pure Fermi decay 10 C(β + ) 10 B ∗∗ to the second excited state of 10 B has been measured by an accurate determination of the ratio of the intensities of 1.022 and 0.718 MeV γ-rays following this decay and the Gamow-Teller transition to the first excited state of 10 B. Computer programmes were devised for accurate analysis of the intensities of the full energy peaks obtained with a Ge(Li) detector, and for deducing the detector relative efficiency from calibration source data. The results were averaged with those from previous measurements of comparable accuracy to give β 1 = (98.53 ±0.02) % and β 2 = (1.465 ± 0.014) % as the best values of the branching ratios for positon decay to the first and second excited states of 10 B respectively. The ft value of the Fermi transition was deduced as 3155±40 s with radiative corrections, and the corresponding vector coupling constant as G β V = (1.396 ± 0.009) × 10 −49 erg · cm 3 .
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