Nuclear probes of an out-of-equilibrium plasma at the highest compression
| Pub type: | Article |
| Citation: | GZhang_PLA_v383_p2285--2289 |
| Status: | Published |
| Journal: | Physics Letters A |
| Volume: | 383 |
| Number: | 19 |
| Year: | 2019 |
| Month: | Jul |
| Pages: | 2285--2289 |
| Publisher: | Elsevier {BV} |
| URL: | https://doi.org/10.1016%2Fj.ph... |
| DOI: | 10.1016/j.physleta.2019.04.048 |
| Abstract: | We report the highest compression reached in laboratory plasmas using eight laser beams, Elaser=12 kJ, tau_laser=2 ns in third harmonic on a CD2 target at the ShenGuang-II Upgrade (SGII-Up) facility in Shanghai, China. We estimate the deuterium density RhoD= 2.0 +-0.9 kg/cm3, and the average kinetic energy of the plasma ions less than 1 keV. The highest reached areal density RhoD=4.8 +-1.5 g/cm2 was obtained from the measured ratio of the sequential ternary fusion reactions (dd->t+p and t+d->+n) and the two body reaction fusions (dd->3He+n). At such high densities, sequential ternary and also quaternary nuclear reactions become important as well (i.e. n(14.1 MeV) + 12C -> n'+12C* etc.) resulting in a shift of the neutron (and proton) kinetic energies from their birth values. The Down Scatter Ratio (DSR-quaternary nuclear reactions) method, i.e. the ratio of the 10-12MeV neutrons divided by the total number of 14.1MeV neutrons produced, conrms the high densities reported above. The estimated lifetime of the highly compressed plasma is 52 9 ps, much smaller than the lasers pulse duration. |
| Month_val: | 7 |
| Sig contrib: | A. Bonasera |
| Authors: | |
| Added by: | [DGM] |
| Total mark: | 0 |
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