Nuclear excitation by electron capture followed by fast x-ray emission

Details Nuclear excitation by electron capture followed by fast x-ray emission Nuclear excitation by electron capture followed by fast x-ray emission

2008-03-19

arxiv.org/abs/0803.2858v1

Phys.Lett.B661:330-334,2008

Physics

Nuclear Physics

Nuclear Theory

12 pages, 1 figure, 2 tables

Scientific paper

10.1016/j.physletb.2008.02.027

The resonance strength of the two-step process of nuclear excitation by electron capture followed by $\gamma$ decay of the nucleus can be significantly increased in highly charged ions if the resonant capture proceeds via an excited electronic state with subsequent fast x-ray emission. For fully ionized $^{238}_{92}\mathrm{U}$ and $^{232}_{90}\mathrm{Th}$, the {x-ray} decay stabilizes the system against internal conversion of the captured electron, with an increase of both nuclear lifetimes and resonance strengths of up to two orders of magnitude compared with the case when occupied atomic orbitals prevent the x-ray de-excitation. Applications of this effect to the measurement of the not yet experimentally observed nuclear excitation by electron capture and to dense astrophysical plasmas are discussed.

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