Rate for laser-induced nuclear dipole absorption

Abstract:

Using the Brink-Axel hypothesis we derive the rate $R$ for nuclear dipole excitation by a laser pulse carrying $N\gg 1$ photons with average energy $\hslash {\omega }_0\approx 5$ MeV. As expected $R\propto {\left(\hslash {}_0\right)}^3$. The rate is also proportional to the aperture $\alpha$ of the laser pulse. Perhaps less expected is the fact that $R\propto N$, irrespective of the degree of coherence of the laser pulse. The expression for $R$, derived for a nearly stationary laser pulse, is valid also for short times and can, thus, be used in simulations via rate equations of multiple nuclear dipole excitations by a single pulse. The explicit dependence of $R$ on the parameters of the laser pulse and on nuclear parameters given in the paper should help to optimize experiments on laser-nucleus reactions.

A. Pálffy, P.-G. Reinhard, H. A. Weidenmüller: Rate for Laser-Induced Nuclear Dipole Absorption, Phys. Rev. C 101, 034619 (2020), (DOI: 10.1103/PhysRevC.101.034619)       

https://journals.aps.org/prc/abstract/10.1103/PhysRevC.101.034619

Related to Project B02