Berlin 2014 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 41: Interaction with VUV and X-ray light II
A 41.4: Vortrag
Donnerstag, 20. März 2014, 15:00–15:15, BEBEL E42
Dominant secondary nuclear photoexcitation with the XFEL — •Jonas Gunst1, Yuri A. Litvinov2, Christoph H. Keitel1, and Adriana Pálffy1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2GSI Helmholtzzentrum, Darmstadt
The highly brilliant photon beams provided by x–ray free electron lasers (XFEL) are expected to strongly advance the resonant driving of nuclei embedded in solid–state targets. Concurrently, the high electric field intensities may also generate new states of matter like cold, high density plasmas [1] where secondary nuclear excitation processes via the coupling to the atomic shell are rendered possible. Here, we investigate at the example of 93mMo isomer triggering the nuclear excitation by electron capture (NEEC) as secondary process in an XFEL scenario explicitly designed for direct photoexcitation.
In 93mMo triggering the isomeric energy of 2.4 MeV could be released via a 4.85 keV transition to an above lying level connected to freely radiating states. Our results prove that the triggering via NEEC is orders of magnitude higher than via direct photoexcitation mainly due to a higher cross section and an increased interaction time [2]. Moreover, due to the broad electron distribution in the plasma, the NEEC isomer activation is more robust against the fulfillment of the resonance condition. The latter can be essential for an experimental realization due to the present uncertainty of 80 eV in the 93mMo triggering transition.
[1] S. M. Vinko et al., Nature 482, 59 (2012)
[2] J. Gunst et al., arXiv:1309.5835 (2013)