Fu Zhen-Guo, Wang Zhigang, Li Meng-Lei, Li Da-Fang, Kang Wei, Zhang Ping
Center for Fusion Energy Science and Technology, CAEP, P.O. Box 8009, Beijing 100088, China.
Institute of Applied Physics and Computational Mathematics, P.O. Box 8009, Beijing 100088, China.
Phys Rev E. 2016 Dec;94(6-1):063203. doi: 10.1103/PhysRevE.94.063203. Epub 2016 Dec 9.
The energy loss of multi-MeV charged particles moving in two-component warm dense plasmas (WDPs) is studied theoretically beyond the random-phase approximation. The short-range correlations between particles are taken into account via dynamic local field corrections (DLFC) in a Mermin dielectric function for two-component plasmas. The mean ionization states are obtained by employing the detailed configuration accounting model. The Yukawa-type effective potential is used to derive the DLFC. Numerically, the DLFC are obtained via self-consistent iterative operations. We find that the DLFC are significant around the maximum of the stopping power. Furthermore, by using the two-component extended Mermin dielectric function model including the DLFC, the energy loss of a proton with an initial energy of ∼15 MeV passing through a WDP of beryllium with an electronic density around the solid value n_{e}≈3×10^{23}cm^{-3} and with temperature around ∼40 eV is estimated numerically. The numerical result is reasonably consistent with the experimental observations [A. B. Zylsta et al., Phys. Rev. Lett. 111, 215002 (2013)PRLTAO0031-900710.1103/PhysRevLett.111.215002]. Our results show that the partial ionization and the dynamic properties should be of importance for the stopping of charged particles moving in the WDP.
