Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 7: Structure and Dynamics of Nuclei II

HK 7.5: Talk

Monday, March 30, 2020, 17:45–18:00, J-HS H

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

At the Extreme Light Infrastructure facility under construction in Romania or at the Gamma Factory envisaged at the LHC, intense and partially coherent photon beams with energies ranging up to several MeV should soon become available. 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 of such intense MeV gamma-ray pulses with medium-weight nuclei. The time-dependent interplay between the rates of average photon absorption, statistical equilibration and neutron evaporation 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 complete nuclear equilibration of the nucleus. Consequently, multiple photon absorptions lead to neutron evaporation. We investigate the time scales of compound nucleus equilibration, as well as lifetimes of state classes with different particle-hole numbers and refer them to the spreading width of the giant dipole resonance.

[1] A. Pálffy and H. A. Weidenmüller, PRL 112, 192502 (2014).

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