Stuttgart 2012 – scientific programme
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A: Fachverband Atomphysik
A 9: Electron scattering and recombination
A 9.6: Talk
Monday, March 12, 2012, 17:45–18:00, V57.05
Overlapping resonances and interference in nuclei coupling to the atomic shell — Srinivas K. Arigapudi1,2 and •Adriana Pálffy2 — 1Indian Institute of Technology Delhi, New Delhi, India — 2Max-Planck-Institut für Kernphysik, Heidelberg, Germany
A new aspect of electron recombination into highly charged ions (HCI) involving the coupling of the atomic shell to the nucleus in the process of nuclear excitation by electron transition (NEET) is investigated. In NEET, a bound electronic decay transition occurs with the simultaneous excitation of the nucleus, provided that the energies of the atomic and nuclear transition match [1]. Our scenario involves the resonant process of dielectronic capture (DC) into HCI to create the electronic hole needed for NEET. HCI present the advantage that the atomic level energies are very sensitive to the ion charge state and offer the possibility to optimize the match between atomic and nuclear transition energies. The NEET probability can thus be enhanced by several orders of magnitude compared to neutral atoms. The total and interference cross section terms for the processes of radiative and dielectronic recombination, DC followed by NEET and γ decay and nuclear excitation by electron capture (NEEC) followed by γ decay were deduced and their magnitude investigated for the case of 237Np [2]. Our results show that NEEC may be the most important contribution to the total recombination cross sections in HCI and that the interference terms, although small, are still larger than the NEET cross section.
[1] S. Kishimoto et al., Phys. Rev. Lett. 85, 1831 (2000).
[2] S. K. Arigapudi and A. Pálffy, arXiv:1109.2894 (2011).