Mainz 2017 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 26: Poster Session II

A 26.28: Poster

Mittwoch, 8. März 2017, 17:00–19:00, P OG1

Sudden regime of laser-nucleus interaction — •Sergei Kobzak, Adriana Pálffy, and Hans Weidenmüller — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany

Recent experimental developments in laser physics and laser-driven acceleration promise to deliver coherent photon beams with energies ranging up to several MeV. The prospect of a laser beam with photon energies comparable to typical nuclear excitation energies raises a number of questions and opens new unexplored avenues for nuclear physics [1,2].

In this work we investigate theoretically the interaction between coherent gamma-ray laser pulses and medium-weight or heavy nuclei in the case of sudden regime. In this regime the compound nucleus statistical equilibration rate is slower than the average photon absorption rate. Consequently, nucleons are excited independently and are expelled from the common average potential. Multiple photon absorptions may lead to complete evaporation of the nucleus if the duration of the laser pulse of several MeV per photon is long enough. The time evolution of such processes is studied with help of master equations which take into account neutron decay and feeding, dipole absorption and emission and the nucleon-nucleon interaction.

[1] A. Pálffy and H. A. Weidenmüller, Phys. Rev. Lett. 112, 192502 (2014).

[2] A. Pálffy, O. Buss, A. Hoefer and H. A. Weidenmüller, Phys. Rev. C 92, 044619 (2015).