Lifetime of the $2^{2} S_{\frac{1}{2}}$ State of Singly Ionized Helium

Publisher Website

4 September 1972

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

Vol. 29 (10) , 615-618
https://doi.org/10.1103/physrevlett.29.615

Abstract

The natural lifetime of the

2 S

state of

{He}^{+}

has been measured in a decay-in-flight experiment. The result,

τ = {2.04}_{- 0.34}^{+ 0.81}

msec, is consistent with the theory of two-photon spontaneous emission and determines an upper bound

λ <~ 8 \times 10^{- 5}

for the coupling constant of the pseudoscalar "anapole" interaction.

Keywords

This publication has 10 references indexed in Scilit:

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