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- W2107054911 abstract "In this work we report on ab initio theoretical results for the magnetic-field-induced $2sphantom{rule{0.16em}{0ex}}2pphantom{rule{0.16em}{0ex}}{}^{3}{P}_{0}ensuremath{rightarrow}2{s}^{2phantom{rule{0.16em}{0ex}}1}{S}_{0}$ E1 transition for ions in the beryllium isoelectronic sequence between $Z=5$ and 92. It has been proposed that the rate of the E1M1 two-photon transition $2sphantom{rule{0.16em}{0ex}}2pphantom{rule{0.16em}{0ex}}{}^{3}{P}_{0}ensuremath{rightarrow}2{s}^{2phantom{rule{0.16em}{0ex}}1}{S}_{0}$ can be extracted from the lifetime of the ${}^{3}{P}_{0}$ state in Be-like ions with zero nuclear spin by employing resonant recombination in a storage ring. This experimental approach involves a perturbing external magnetic field. The effect of this field needs to be evaluated in order to properly extract the two-photon rate from the measured decay curves. The magnetic-field-induced transition rates are carefully evaluated, and it is shown that, with a typical storage-ring field strength, it is dominant or of the same order as the E1M1 rate for low- and mid-$Z$ ions. Results for several field strengths and ions are presented, and we also give a simple $Z$-dependent formula for the rate. We estimate the uncertainties of our model to be within $5%$ for low- and mid-$Z$ ions and slightly larger for more highly charged ions. Furthermore we evaluate the importance of including both perturber states, ${}^{3}{P}_{1}$ and ${}^{1}{P}_{1}$, and it is shown that excluding the influence of the ${}^{1}{P}_{1}$ perturber overestimates the rate by up to $26%$ for the mid-$Z$ ions." @default.
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- W2107054911 date "2013-08-22" @default.
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- W2107054911 title "Effect of an external magnetic field on the determination of E1M1 two-photon decay rates in Be-like ions" @default.
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- W2107054911 doi "https://doi.org/10.1103/physreva.88.022513" @default.
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