Darmstadt 2016 – wissenschaftliches Programm

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HK: Fachverband Physik der Hadronen und Kerne

HK 68: Structure and Dynamics of Nuclei XII

HK 68.6: Vortrag

Freitag, 18. März 2016, 15:30–15:45, S1/01 A03

Laser-nucleus reactions in coherent gamma-ray fields — •Adriana Pálffy and Hans A. Weidenmüller — Max-Planck-Institut für Kernphysik, Heidelberg

The generation of coherent gamma-ray fields envisaged at new laser facilities such as the Extreme Light Infrastructure (ELI) holds promise to open the new field of laser-induced nuclear reactions, so far an unknown territory. The laser-nucleus reaction is expected to depend sensitively on how fast successive photon absorption processes occur compared to the nuclear relaxation rate. Here we investigate theoretically the laser-nucleus interaction both in the quasiadiabatic regime and in the sudden regime. In the quasiadiabatic regime, the nucleus (almost) attains statistical equilibrium between two subsequent photon absorption processes. Consecutive absorption of many MeV-gamma photons then leads to the formation of a compound nucleus with excitation energy several hundred MeV above yrast, i.e., in a so-far totally unexplored parameter regime [1, 2]. In the sudden regime, several or many photons are absorbed before the nucleus has time to relax. In that case, the gamma-ray coherent laser pulse may set several or even all nucleons free. This regime offers the possibility to investigate the transition from a bound system of strongly correlated nucleons to a set of independent particles.

[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).