Lifetimes of the 2893- and 3464-keV levels ofAr40

1 November 1975

journal article
research article
Published by American Physical Society (APS) in Physical Review C

Vol. 12 (5) , 1392-1395
https://doi.org/10.1103/physrevc.12.1392

Abstract

The recoil-distance method has been used in conjunction with the

{}^{27}{Al} ({}^{18}O, p α) {}^{40}{Ar}

and

{}^{37}{Cl} (α, p) {}^{40}{Ar}

reactions to measure mean lifetimes of 4.2±2.0 and 930±50 ps for the

{}^{40}{Ar}

2893- and 3464-keV levels, respectively. The excitation energies of these two levels were deduced to be 2892.60±0.11 and 3464.48±0.13 keV, respectively. The 3464-keV level is assigned

J^{π} = 6^{+}

on the basis of the lifetime, the

γ

-ray angular distribution, and previous

{}^{38}{Ar} (t, p) {}^{40}{Ar}

results. The

E 2

transition strengths of the

{}^{40}{Ar}

0^{+}

2^{+}

4^{+}

6^{+}

ground-state band are compared to those of

{}^{42}{Ca}

and to shell-model calculations.

Keywords

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