München 2019 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 50: Structure and Dynamics of Nuclei X

HK 50.6: Vortrag

Donnerstag, 21. März 2019, 15:30–15:45, HS 16

Sudden regime of laser-nucleus interaction — •Sergei Kobzak, Hans Weidenmüller, and Adriana Pálffy — 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. Novel experiments employing a laser beam with photon energies comparable to typical nuclear excitation energies will shed light on a number of questions and will open 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. The time-dependent interplay between the average photon absorption, the compound nucleus statistical equilibration rate and the neutron evaporation rate is studied with the help of the master equation [2]. The sudden regime of laser-nucleus interaction refers to the case when photon absorption occurs faster than the nuclear equilibration of the nucleus. Consequently, nucleons are excited independently and are expelled from the common average potential. Multiple photon absorption may lead to complete evaporation of the nucleus if the duration of the laser pulse of several MeV per photon is long enough. We investigate the time scale and the characteristic parameters for the sudden regime.

[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).