17 research outputs found
X-ray scattering from warm dense iron
We have carried out X-ray scattering experiments on iron foil samples that have been compressed and heated using laser-driven shocks created with the VULCAN laser system at the Rutherford-Appleton Laboratory. This is the highest Z element studied in such experiments so far and the first time scattering from warm dense iron has been reported. Because of the importance of iron in telluric planets, the work is relevant to studies of warm dense matter in planetary interiors. We report scattering results as well as shock breakout results that, in conjunction with hydrodynamic simulations, suggest the target has been compressed to a molten state at several 100 GPa pressure. Initial comparison with modelling suggests more work is needed to understand the structure factor of warm dense iron
Asymmetric Bethe-Salpeter equation for pairing and condensation
The Martin-Schwinger hierarchy of correlations are reexamined and the
three-particle correlations are investigated under various partial summations.
Besides the known approximations of screened, ladder and maximally crossed
diagrams the pair-pair correlations are considered. It is shown that the
recently proposed asymmetric Bethe-Salpeter equation to avoid unphysical
repeated collisions is derived as a result of the hierarchical dependencies of
correlations. Exceeding the parquet approximation we show that an asymmetry
appears in the selfconsistent propagators. This form is superior over the
symmetric selfconsistent one since it provides the Nambu-Gorkov equations and
gap equation for fermions and the Beliaev equations for bosons while from the
symmetric form no gap equation results. The selfenergy diagrams which account
for the subtraction of unphysical repeated collisions are derived from the
pair-pair correlation in the three-particle Greenfunction. It is suggested to
distinguish between two types of selfconsistency, the channel-dressed
propagators and the completely dressed propagators, with the help of which the
asymmetric expansion completes the Ward identity and is -derivable.Comment: 12 pages. 26 figure
Parity nonconserving cold neutron-parahydrogen interactions
Three pion dominated observables of the parity nonconserving interactions
between the cold neutrons and parahydrogen are calculated. The transversely
polarized neutron spin rotation, unpolarized neutron longitudinal polarization,
and photon-asymmetry of the radiative polarized neutron capture are considered.
For the numerical evaluation of the observables, the strong interactions are
taken into account by the Reid93 potential and the parity nonconserving
interactions by the DDH model along with the two-pion exchange.Comment: 17 pages, 2 figure
Recommended from our members
Recovery of release cloud from laser shock-loaded graphite and hydrocarbon targets: in search of diamonds
This work presents first insights into the dynamics of free-surface release clouds from dynamically compressed polystyrene and pyrolytic graphite at pressures up to 200 GPa, where they transform into diamond or lonsdaleite, respectively. These ejecta clouds are released into either vacuum or various types of catcher systems, and are monitored with high-speed recordings (frame rates up to 10 MHz). Molecular dynamics simulations are used to give insights to the rate of diamond preservation throughout the free expansion and the catcher impact process, highlighting the challenges of diamond retrieval. Raman spectroscopy data show graphitic signatures on a catcher plate confirming that the shock-compressed PS is transformed. First electron microscopy analyses of solid catcher plates yield an outstanding number of different spherical-like objects in the size range between ten(s) up to hundreds of nanometres, which are one type of two potential diamond candidates identified. The origin of some objects can unambiguously be assigned, while the history of others remains speculative
Static and dynamic structure factors with account of the ion structure for high-temperature alkali and alkaline earth plasmas
The electron-electron, electron-ion, ion-ion and charge-charge static structure factors are calculated for alkali (at T = 30 000 K, 60 000 K, n (e) = 0.7 x 10(21) A center dot 1.1 x 10(22) cm(-3)) and Be2+ (at T = 20 eV, n (e) = 2.5 x 10(23) cm(-3)) plasmas using the method described by Gregori et al. The dynamic structure factors for alkali plasmas are calculated at T = 30 000 K, n (e) = 1.74 x 10(20), 1.11 x 10(22) cm(-3) using the method of moments developed by Adamjan et al. In both methods the screened Hellmann-Gurskii-Krasko potential, obtained on the basis of Bogolyubov's method, has been used taking into account not only the quantum-mechanical effects but also the repulsion due to the Pauli exclusion principle. The repulsive part of the Hellmann-Gurskii-Krasko (HGK) potential reflects important features of the ion structure. Our results on the static structure factors for Be2+ plasma deviate from the data obtained by Gregori et al., while our dynamic structure factors are in a reasonable agreement with those of Adamyan et al.: at higher values of k and with increasing k the curves damp down while at lower values of k, and especially at higher electron coupling, we observe sharp peaks also reported in the mentioned work. For lower electron coupling the dynamic structure factors of Li+, Na+, K+, Rb+ and Cs+ do not differ while at higher electron coupling these curves split. As the number of shell electrons increases from Li+ to Cs+ the curves shift in the direction of low absolute value of omega and their heights diminish. We conclude that the short range forces, which we take into account by means of the HGK model potential, which deviates from the Coulomb and Deutsch ones, influence the static and dynamic structure factors significantly.The work has been realised at the Humboldt University at Berlin (Germany). One of the authors (S. P. Sadykova) would like to express sincere thanks to the Erasmus Mundus Program of the EU for the financial support and especially to Mr. M. Parske for his aid, to the Institute of Physics, Humboldt University at Berlin, for the support which made her participation at some scientific Conferences possible; I. M. T. acknowledges the financial support of the Spanish Ministerio de Educacion y Ciencia Project No. ENE2007-67406-C02-02/FTN and valuable discussions with Dr. D. Gericke.Sadykova, SP.; Ebeling, W.; Tkachenko Gorski, IM. (2011). Static and dynamic structure factors with account of the ion structure for high-temperature alkali and alkaline earth plasmas. European Physical Journal D. 61(1):117-130. https://doi.org/10.1140/epjd/e2010-10118-yS117130611G. Gregori, O.L. Landen, S.H. Glenzer, Phys. Rev. E 74, 026402 (2006)G. Gregori, A. Ravasio, A. Höll, S.H. Glenzer, S.J. Rose, High Energy Density Physics 3, 99 (2007)V.M. Adamyan, I.M. Tkachenko, Teplofiz. Vys. Temp. 21, 417 (1983) [High Temp. (USA) 21, 307 (1983)]V.M. Adamyan, T. Meyer, I.M. Tkachenko, Fiz. Plazmy 11, 826 (1985) [Sov. J. Plasma Phys. 11, 481 (1985)]S.V. Adamjan, I.M. Tkachenko, J.L. Muñoz-Cobo, G. VerdĂş MartĂn, Phys. Rev. E 48, 2067 (1993)V.M. Adamyan, I.M. Tkachenko, Contrib. Plasma Phys. 43, 252 (2003)S. Sadykova, W. Ebeling, I. Valuev, I. Sokolov, Contrib. Plasma Phys. 49, 76 (2009)M.J. Rosseinsky, K. Prassides, Nature 464, 39 (2010)Physics and Chemistry of Alkali Metal Adsorption, edited by H.P. Bonzel, A.M. Bradshaw, G. Ertl (Elsevier, Amsterdam, 1989), Materials Science Monographs, Vol. 57A.N. Klyucharev, N.N. Bezuglov, A.A. Matveev, A.A. Mihajlov, Lj.M. Ignjatović, M.S. Dimitrijević, New Astron. Rev. 51, 547 (2007)F. Hensel, Liquid Metals, edited by R. Evans, D.A. Greenwood, IOP Conf. Ser. No. 30 (IPPS, London, 1977)F. Hensel, S. Juengst, F. Noll, R. Winter, In Localisation and Metal Insulator Transitions, edited by D. Adler, H. Fritsche (Plenum Press, New York, 1985)N.F. Mott, Metal-Insulator Transitions (Taylor and Francis, London, 1974)H. Hess, Physics of nonideal plasmas, edited by W. Ebeling, A. Foerster, R. Radtke, B.G. Teubner (Leipzig, 1992)V. Sizyuk, A. Hassanein, T. Sizyuk, J. Appl. Phys. 100, 103106 (2006)S. Sadykova, W. Ebeling, I. Valuev, I. Sokolov, Contrib. Plasma Phys. 49, 388 (2009)H. Ebert, Physikalisches Taschenbuch (F. Vieweg & Sohn, Braunschweig, 1967)S.H. Glenzer, G. Gregori, R.W. Lee, F.J. Rogers, S.W. Pollaine, O.L. Landen, Phys. Rev. Lett. 90, 175002 (2003)G. Gregori, S.H. Glenzer, H.-K. Chung, D.H. Froula, R.W. Lee, N.B. Meezan, J.D. Moody, C. Niemann, O.L. Landen, B. Holst, R. Redmer, S.P. Regan, H. Sawada, J. Quant. Spectrosc. Radiat. Transfer 99, 225237 (2006)D. Riley, N.C. Woolsey, D. McSherry, I. Weaver, A. Djaoui, E. Nardi, Phys. Rev. Lett. 84, 1704 (2000)S.H. Glenzer, Phys. Rev. Lett. 98, 065002 (2007)J. Sheffield, Plasma Scattering of Electromagnetic Radiation (Academic Press, New York, 1975)A. Höll, Th. Bornath, L. Cao, T. Döppner, S. DĂĽsterer, E. Föster, C. Fortmann, S.H. Glenzer, G. Gregori, T. Laarmann, K.-H. Meiwes-Broer, A. Przystawik, P. Radcliffe, R. Redmer, H. Reinholz, G. Röpke, R. Thiele, J. Tiggesbäumker, S. Toleikis, N.X. Truong, T. Tschentscher, I. Ushmann, U. Zastrau, High Energy Density Phys. 3, 120 (2007)Yu.V. Arkhipov, A. Askaruly, D. Ballester, A.E. Davletov, G.M. Meirkhanova, I.M. Tkachenko, Phys. Rev. E 76, 026403 (2007)Yu.V. Arkhipov, A. Askaruly, D. Ballester, A.E. Davletov, I.M. Tkachenko, G. Zwicknagel, Phys. Rev. E 81, 026402 (2010)J.P. Hansen, I.R. Mc. Donald, Phys. Rev. A 23, 2041 (1981)J.P. Hansen, E.L. Polock, I.R. McDonald, Phys. Rev. Lett. 32, 277 (1974)V. Schwarz, B. Holst, T. Bornath, C. Fortmann, W-D. Kraeft, R. Thiele, R. Redmer, G. Gregori, H. Ja Leed, T. Döppner, S.H. Glenzer, High Energy Density Phys. 5, 1 (2009)D.O. Gericke, K. WĂĽnsch, J. Vorberger, Nucl. Instrum. Methods Phys. Res. A 606, 142 (2009)B. Bernu, D. Ceperley, Quantum Monte Carlo Methods in Physics and Chemistry, edited by M.P. Nightingale, C. Umrigar (Kluwer Academic Publishers, Boston, 1999), NATO ASI Series, Series C, Mathematical and Physical Sciences, Vol. C-525G. Kelbg, Ann. Physik 13 354 (1964)C. Deutsch, Phys. Lett. A 60, 317 (1977)H. Minoo, M.M. Gombert, C. Deutsch, Phys. Rev. A 23, 924 (1981)W. Ebeling, G.E. Norman, A.A. Valuev, I. Valuev, Contrib. Plasma Phys. 39, 61 (1999)A.V. Filinov, M. Bonitz, W. Ebeling, J. Phys. A. 36, 5957 (2003)H. Hellmann, J. Chem. Phys. 3, 61 (1935)H. Hellmann, Acta Fizicochem. USSR 1, 913 (1935)H. Hellmann, Acta Fizicochem. USSR 4, 225 (1936)H. Hellmann, W. Kassatotschkin, Acta Fizicochem. USSR 5, 23 (1936)W.A. Harrison, Pseudopotentials in the Theory of Metals (Benjamin, New York, 1966)V. Heine, M.L. Cohen, D. Weaire, Psevdopotenzcial'naya Teoriya (Mir, Moskva, 1973)V. Heine, The pseudopotential concept, edited by H. Ehrenreich, F. Seitz, D. Turnbull, Solid State Physics 24, 1 (Academic, New York 1970)G.L. Krasko, Z.A. Gurskii, JETP Lett. 9, 363 (1969)W. Ebeling, W.-D. Kraeft, D. Kremp, Theory of Bound State and Ionization Equilibrium in Plasmas and Solids (Akademie-Verlag, Berlin, 1976)W. Zimdahl, W. Ebeling, Ann. Phys. (Leipzig) 34, 9 (1977)W. Ebeling, C.-V. Meister, R. Saendig, 13 ICPIG (Berlin, 1977) 725W. Ebeling, C.V. Meister, R. Saendig, W.-D. Kraeft, Ann. Phys. 491, 321 (1979)N.N. Bogolyubov, Dynamical Theory Problems in Statistical Physics (in Russian) (GITTL, Moscow, 1946)N.N. Bogolyubov, Studies in Statistical Mechanics, Engl. Transl., edited by J. De Boer, G.E. Uhlenbeck (North-Holland, Amsterdam, 1962)H. Falkenhagen, Theorie der Elektrolyte (S. Hirzel Verlag, Leipzig, 1971), p. 369Yu.V. Arkhipov, F.B. Baimbetov, A.E. Davletov, Eur. Phys. J. D 8, 299 (2000)P. Seuferling, J. Vogel, C. Toepffer, Phys. Rev. A 40, 323 (1989)L. Szasz, Pseudopotential Theory of Atoms and Molecules (Wiley-Intersc., New York, 1985)W.H.E. Schwarz, Acta Phys. Hung. 27, 391 (1969)W.H.E. Schwarz, Theor. Chim. Acta 11, 307 (1968)N.P. Kovalenko, Yu.P. Krasnyj, U. Krey, Physics of Amorphous Metalls (Wiley-VCH, Weinheim, 2001)Z.A. Gurski, G.L. Krasko, Doklady Akademii Nauk SSSR (in Russian) 197, 810 (1971)C. Fiolhais, J.P. Perdew, S.Q. Armster, J.M. MacLaren, Phys. Rev. B 51, 14001 (1995)S.S. Dalgic, S. Dalgic, G. Tezgor, Phys. Chem. Liq. 40, 539, (2002)E.M. Apfelbaum, Phys. Chem. Liq., 48, 534 (2010)Yu.V. Arkhipov, A.E. Davletov, Phys. Lett. A 247, 339 (1998)W. Ebeling, J. Ortner, Physica Scripta T 75, 93 (1998)J. Ortner, F. Schautz, W. Ebeling, Phys. Rev. E 56, 4665 (1997)N.I. Akhieser, The classical Moment Problem (Oliver and Boyd, London, 1965)M.G. Krein, A.A. Nudel'man, The Markov Moment Problem and External Problems (American Mathematical Society, Translations, New York, 1977)M.J. CorbatĂłn, I.M. Tkachenko, Int. Conference on Strongly Coupled Coulomb Systems (SCCS2008), Camerino, Italy, July-August, 2008, Book of Abstracts, p. 90V.M. Adamyan, A.A. Mihajlov, N.M. Sakan, V.A. Srećković, I.M. Tkachenko, J. Phys. A: Math. Theor. 42, 214005 (2009)S. Ichimaru, Statistical Plasma Physics, Vol. I: Basic Principles (Addison-Wesley, Redwood City, 1992)W. Ebeling, A. Foerster, W. Richert, H. Hess, Physics A 150, 159 (1988)H. Wagenknecht, W. Ebeling, A. Förster, Contrib. Plasma Phys. 41, 15 (2001
Effects of strong beam-plasma coupling on the stopping power of dense plasmas
Starting from quantum kinetic equations, the stopping power of dense plasmas is investigated. Strong beam-plasma correlations which occur for highly charged beam ions and strongly coupled plasmas are considered on the level of the static screened T-matrix approximation. Furthermore, dynamic screening effects are included. This approach is used to investigate the ion charge number dependence of the stopping power. In the strong coupling region, a modification of the Z2b scaling law which follows from weak coupling theories is found. The comparison of the T-matrix results with simulation data (PIC) shows good agreement for low beam velocities
-particle stopping and electron-ion energy relaxation in highly compressed ICF fuel
We compare calculations for the energy loss of α-particles and the electron-ion energy transfer rate in high-density hydrogen plasmas at conditions similar to the compressed main fuel in ICF targets. Different models, which do and do not account for collective effects and electron degeneracy, are considered. It is shown that quantum degeneracy in the cold fuel significantly lowers the energy deposition of the α-particles at the high densities of ICF targets. Electron degeneracy is also important for the electron-ion energy transfer where collective modes can play an important role as well