Half-lives of ${}^{6}{He}$ , ${}^{19}{Ne}$ , and ${}^{42}{Sc}^{m}$

The half-lives of

{}^{6}{He}

{}^{19}{Ne}

, and

{}^{42}{Sc}^{m}

have been measured as 808.1 ± 2.0 msec, 17.36 ± 0.06 sec, and 62.0 ± 0.3 sec, respectively. The activities were formed in the

{}^{9}{Be} (n, α) {}^{6}{He}

{}^{19}F (p, n) {}^{19}{Ne}

, and

{}^{42}{Ca} (p, n) {}^{42}{Sc}

reactions. Half-lives of

{}^{6}{He}

and

{}^{19}{Ne}

were determined by multiscaling

β

rays detected in a plastic scintillator, whereas the

{}^{42}{Sc}^{m}

half-life was obtained from the decay of the

γ

-ray spectrum in a Ge(Li) detector. The

ft

values deduced for

{}^{6}{He}

{}^{19}{Ne}

, and

{}^{42}{Sc}^{m}

are, respectively, 815.7 ± 4.2 sec, 1728.4 ± 6.7 sec, and 14 758 ± 91 sec. The values

| 〈 σ 〉 |

of the Gamow-Teller matrix elements are given by, respectively,

R_{e} | 〈 σ 〉 | = 2.7472 \pm 0.0077, 1.6006 \pm 0.0042, and 0.6448 \pm 0.0021

, where

R_{e}

is the magnitude of the ratio of the axial to vector coupling constants appropriate for the respective complex nuclei.

This publication has 15 references indexed in Scilit:

Half-lives ofHe6,Ne19, andScm42