Düsseldorf 2007 – scientific programme
Parts | Days | Selection | Search | Downloads | Help
A: Fachverband Atomphysik
A 10: Poster I - Precisions Spectroscopy
A 10.8: Poster
Tuesday, March 20, 2007, 16:30–18:30, Poster B
Precision Lifetime Determination of the Fe XIV 3s23p 2P3/2o Metastable Level — Guenter Brenner and •Jose Ramon Crespo López-Urrutia — Max-Planck-Insitut für Kernphysik, Heidelberg
The lifetime of the 3s2 3p 2P3/2o first excited energy level of Fe XIV (Al-like) was measured at the Heidelberg electron beam ion trap by monitoring its optical decay to the ground state by a magnetic dipole (M1) forbidden transition at λ=530.29 nm (green coronal line), a well known line in stellar spectra. A new trapping scheme has been applied. Possible systematic effects were investigated by studying the dependence of the decay curves on various trapping conditions with high statistical significance. The result of 16.726−0.010+0.020 ms shows a clear discrepancy of about 4σ to existing theoretical predictions. The inclusion of the electron anomalous magnetic moment (EAMM) within the theoretical calculations increases this disagreement, thus pointing at other possible origins of this discrepancy.