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Plasma stopping-power measurements reveal transition from non-degenerate to degenerate plasmas

Abstract

Physically realized electron gas systems usually reside in either the quantum non-degenerate or fully degenerate limit, where the average de Broglie wavelength of the thermal electrons becomes comparable with the interparticle distance between electrons. A few systems, such as young brown dwarfs and the cold dense fuels created in imploded cryogenic capsules at the National Ignition Facility, lie between these two limits and are partially degenerate. The National Ignition Facility has the unique capability of varying the electron quantum degeneracy by adjusting the laser drive used to implode the capsules. This allows experimental studies of the effects of the degeneracy level on plasma transport properties. By measuring rare nuclear reactions in these cold dense fuels, we show that the electron stopping power, which is the rate of energy loss per unit distance travelled by a charged particle, changes with increasing electron density. We observe a quantum-induced shift in the peak of the stopping power using diagnostics that measure above and below this peak. The observed changes in the stopping power are shown to be unique to the transition region between non-degenerate and degenerate plasmas. Our results support the screening models applied to partially degenerate astrophysical systems such as young brown dwarfs.

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Fig. 1: The density profiles for a NIF cryogenic capsule and astrophysical brown dwarfs are quite similar.
Fig. 2: RIF production.
Fig. 3: The effects of changes in the average electron velocity on the stopping power and RIF neutron spectra.
Fig. 4: The experimental data as a function of the surrogate for the electron density.
Fig. 5: Neutron images for two shots, together with corresponding RIF data.

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Data availability

Source data for Figs. 3 and 4 are available with the paper. All other data that support the plots within this paper and other findings of this study are available from the corresponding author upon reasonable request.

References

  1. Daligault, J. Crossover from classical to Fermi liquid behavior in dense plasmas. Phys. Rev. Lett. 119, 045002 (2017).

    Article  ADS  Google Scholar 

  2. Salpeter, E. E. Electron screening and thermonuclear reaction rates. Aust. J. Phys. 7, 373–388 (1954).

    Article  ADS  Google Scholar 

  3. Shternin, P. S. Shear viscosity of degenerate electron matter. J. Phys. A 41, 205501 (2008).

    Article  ADS  MathSciNet  Google Scholar 

  4. Maynard, G. & Deutsch, C. Born random phase approximation for ion stopping in an arbitrarily degenerate electron fluid. J. Phys. 46, 1113–1122 (1985).

    Article  Google Scholar 

  5. Skupsky, S. Energy loss of ions moving through high-density matter. Phys. Rev. A 16, 727–731 (1977).

    Article  ADS  Google Scholar 

  6. Dar, A., Grunzweig-Genossar, J., Peres, A., Revzen, M. & Rob, A. Slowing down of ions by ultrahigh-density electron plasma. Phys. Rev. Lett. 32, 1299–1301 (1974).

    Article  ADS  Google Scholar 

  7. Li, C. & Pettrasso, R. D. Effects of scattering upon energetic ion energy loss in plasmas. Phys. Plasma 2, 2460–2464 (1995).

    Article  ADS  Google Scholar 

  8. Brown, L. S. & Singleton, R. L. Jr Temperature equilibration rate with Fermi–Dirac statistics. Phys. Rev. E 76, 066404 (2007).

    Article  ADS  Google Scholar 

  9. Lee, Y. T. & More, R. M. An electron conductivity model for dense plasmas. Phys. Fluids 27, 1273–1286 (1984).

    Article  ADS  Google Scholar 

  10. Longair, M. S. The Cosmic Century: A History of Astrophysics and Cosmology (Cambridge Univ. Press, 2006).

  11. Marshak, R. E. The internal temperature of white dwarf stars. Astrophys. J. 92, 321–353 (1940).

    Article  ADS  Google Scholar 

  12. Lattimer, J. M. & Prakash, M. The physics of neutron stars. Science 304, 536–542 (2004).

    Article  ADS  Google Scholar 

  13. Ashcroft, N. W. & Mermin, N. D. Solid State Physics (Harcourt School, 1987).

  14. Burrows, A. & Liebert, J. The science of brown dwarfs. Rev. Mod. Phys. 65, 301–336 (1993).

    Article  ADS  Google Scholar 

  15. Lindl, J. Development of the indirect-drive approach to inertial confinement fusion and the target physics basis for ignition and gain. Phys. Plasmas 2, 3933–4024 (1995).

    Article  ADS  Google Scholar 

  16. Edwards, M. J. et al. Progress towards ignition on the National Ignition Facility. Phys. Plasmas 20, 070501 (2013).

    Article  ADS  Google Scholar 

  17. Brown, L. S., Preston, D. L. & Singleton, R. L. Jr Charged particle motion in a highly ionized plasma. Phys. Rep. 410, 237–333 (2005).

    Article  ADS  Google Scholar 

  18. Evans, P. M., Fews, A. P. & Toner, W. T. Diagnosis of laser produced plasmas using fusion reaction products. Laser Part. Beams 6, 353–360 (1988).

    Article  ADS  Google Scholar 

  19. Deutsch, C. & Maynard, G. et al. Ion stopping in dense plasma target for high energy density physics. Open Plasma Phys. J. 3, 88–115 (2010).

    Google Scholar 

  20. Zylstra, A. B. et al. Measurements of charged-particle stopping in warm dense plasma. Phys. Rev. 114, 215002 (2015).

    Google Scholar 

  21. Frenje, J. A. et al. Measurements of ion stopping around the Bragg peak in high-energy-density plasmas. Phys. Rev. Lett. 115, 205001 (2015).

    Article  ADS  Google Scholar 

  22. Hopkins, L. Berzak et al. Increasing stagnation pressure and thermonuclear performance of inertial confinement fusion capsules by the introduction of a high-Z dopant. Phys. Plasmas 25, 080706 (2018).

    Article  Google Scholar 

  23. Divol, L. et al. Symmetry control of an indirectly driven high-density-carbon implosion at high convergence and high velocity. Phys. Plasmas 24, 056309 (2017).

    Article  ADS  Google Scholar 

  24. Hinkel, D. E. et al. Development of improved radiation drive environment for high foot implosions at the National Ignition Facility. Phys. Rev. Lett. 117, 225002 (2016).

    Article  ADS  Google Scholar 

  25. Hinkel, D. E. et al. Publisher’s note: development of improved radiation drive environment for high foot implosions at the National Ignition Facility. Phys. Rev. Lett. 118, 089902 (2017).

    Article  ADS  Google Scholar 

  26. Hayes, A. C. et al. Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas. Phys. Plasmas 22, 082703 (2015).

    Article  ADS  Google Scholar 

  27. Hayes, A. C., Bradley, P. A., Grim, G. P., Jungman, G. & Wilhelmy, J. B. Reaction-in-flight neutrons as a signature for shell mixing in National Ignition Facility capsules. Phys. Plasmas 17, 012705 (2010).

    Article  ADS  Google Scholar 

  28. Hayes, A. C. et al. Reaction-in-flight neutrons as a test of stopping power in degenerate plasmas. J. Phys. Conf. Ser. 717, 012022 (2016).

    Article  Google Scholar 

  29. Gooden, M. E. et al. Measurement of the 209Bi(n, 4n) 206Bi and 169Tm(n, 3n) 167Tm cross sections between 23.5 and 30.5 MeV relevant to reaction-in-flight neutron studies at the National Ignition Facility. Phys. Rev. C 96, 024622 (2017).

    Article  ADS  Google Scholar 

  30. GatuJohnson, M. M. et al. Neutron spectrometry–an essential tool for diagnosing implosions at the National Ignition Facility. Rev. Sci. Instrum. 83, 10D308 (2012).

    Article  Google Scholar 

  31. Merrill, F. E. et al. The neutron imaging diagnostic at NIF. Rev. Sci. Instrum. 83, 10D317 (2012).

    Article  Google Scholar 

  32. Hurricane, O. A. et al. The high-foot implosion campaign on the National Ignition Facility. Phys. Plasmas 21, 056314 (2014).

    Article  ADS  Google Scholar 

  33. Salpeter, E. E. & Van Horn, H. M. Nuclear reaction rates at high density. Astrophys. J. 155, 183–202 (1969).

    Article  ADS  Google Scholar 

  34. DeWitt, H. E., Graboske, H. C. & Cooper, M. S. Screening factors for nuclear reaction. I General theory. Astrophys. J. 181, 439–456 (1973).

    Article  ADS  Google Scholar 

  35. Graboske, H. C., DeWitt, H. E., Grossman, A. S. & Cooper, M. S. Screening factors for nuclear reactions. II Intermediate screening and astrophysical applications. Astrophys. J. 181, 457–474 (1973).

    Article  ADS  Google Scholar 

  36. Zimmerman, G. B. Recent Developments in Monte Carlo Report No. UCRL-JC-105616 (Lawrence Livermore National Laboratory, 1990).

  37. Jungman, G. & Hayes, A. C. The Relationship between Charged-Particle Fluence and Stopping Power Report No. LA-UR-13-26171 (Los Alamos National Laboratory, 2013).

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Authors and Affiliations

Authors

Contributions

A.C.H. was the RIF campaign lead and conducted theoretical data analysis. M.E.G. took RIF measurements. E.H. took RIF measurements. G.J. conducted theoretical analysis. J.B.W. conducted data analysis. R.S.R. took RIF measurements and conducted detector design. C.Y. conducted activation diagnostic analysis. G.K. conducted data analysis. C.C. performed hydrodynamical simulations. D.L.D. performed brown dwarf simulations, conducted data analysis and prepared graphics. J.D. conducted theoretical analysis. C. Wilburn conducted data analysis and prepared graphics. P.V. conducted neutron imaging. C. Wilde conducted neutron imaging. S.B. undertook experimental planning and design. T.B. was responsible for detector installation. J.L.K. conducted experimental planning. G.P.G. conducted neutron time-of-flight analysis. E.P.H. conducted neutron time-of-flight analysis. D. Shaughnessy conducted data analysis. C.V. took part in experimental discussions. W.S.C. took part in experimental discussions. K. Moody conducted data collection and analysis. L.F.B.H. undertook capsule design and simulations. D.H. undertook capsule design and simulations. T.D. undertook experimental design and planning. S.L.P. undertook experimental design and planning. F.G. conducted theoretical analysis. D.A.C. undertook capsule design and simulations. O.A.H. undertook capsule design and simulations. D. Schneider conducted experimental design.

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Correspondence to A. C. Hayes.

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Peer review information Nature Physics thanks Adam Burgasser, Giovanni Manfredi and Peter Norreys for their contribution to the peer review of this work.

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Source data

Source Data Fig. 3

Computed curves from theory appearing in each of the four panels of the figure.

Source Data Fig. 4

Experimental data and computed theory curves appearing in the figure.

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Hayes, A.C., Gooden, M.E., Henry, E. et al. Plasma stopping-power measurements reveal transition from non-degenerate to degenerate plasmas. Nat. Phys. 16, 432–437 (2020). https://doi.org/10.1038/s41567-020-0790-3

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