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Title: Proton stopping measurements at low velocity in warm dense carbon

Journal Article · · Nature Communications

Ion stopping in warm dense matter is a process of fundamental importance for the understanding of the properties of dense plasmas, the realization and the interpretation of experiments involving ion-beam-heated warm dense matter samples, and for inertial confinement fusion research. The theoretical description of the ion stopping power in warm dense matter is difficult notably due to electron coupling and degeneracy, and measurements are still largely missing. In particular, the low-velocity stopping range, that features the largest modelling uncertainties, remains virtually unexplored. Here, we report proton energy-loss measurements in warm dense plasma at unprecedented low projectile velocities. Our energy-loss data, combined with a precise target characterization based on plasma-emission measurements using two independent spectroscopy diagnostics, demonstrate a significant deviation of the stopping power from classical models in this regime. In particular, we show that our results are in closest agreement with recent first-principles simulations based on time-dependent density functional theory.

Research Organization:
Univ. of Rochester, NY (United States). Lab. for Laser Energetics; Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); LASERLAB-EUROPE V; European Union (EU); IMPULSE; PALMA; ICTS Equipment; LaserLab Europe IV; Junta de Castilla y León; Canadian Natural Sciences and Engineering Research Council; National Science Foundation (NSF)
Grant/Contract Number:
NA0003856; 871124; 871161; FIS2016-81056-R; EQC2018-005230-P; 654148; CLP087U16; CLP263P20; RGPIN-2019-05013; 1802964; 89233218CNA000001
OSTI ID:
1869477
Alternate ID(s):
OSTI ID: 1875284; OSTI ID: 2005833
Report Number(s):
LA-UR-21-28294; 2893; PII: 30472
Journal Information:
Nature Communications, Journal Name: Nature Communications Vol. 13 Journal Issue: 1; ISSN 2041-1723
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United Kingdom
Language:
English

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