Reports

Half-Lives of Argon-37, Argon-39, and Argon-42

+ See all authors and affiliations

Science  04 Jun 1965:
Vol. 148, Issue 3675, pp. 1325-1328
DOI: 10.1126/science.148.3675.1325

Abstract

The half-lives of three argon isotopes have been carefully determined, with the following results: Ar37, 35.1 ± 0.1 days; Ar39 269 ± 3 years; Ar42, 32.9 ± 1.1 years. By combining the Ar42 value with earlier data, a cross section of 0.5 ± 0.1 barn is calculated for the reaction, with thermal neutrons, Ar41(n,γ)Ar42.