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11.
12.
The peak strength and position of the absorption bands are found to be correlated with the stability and association strength of the complexes. The results confirm concepts on the electron densities in the components.We are indebted to N. D. Sokolov for a useful discussion. 相似文献
13.
We propose a picture of Wigner function scars as a sequence of concentric rings along a two-dimensional surface inside a periodic orbit. This is verified for a two-dimensional plane that contains a classical hyperbolic orbit of a Hamiltonian system with 2 degrees of freedom. The stationary wave functions are the familiar mixture of scarred and random waves, but the spectral average of the Wigner functions in part of the plane is nearly that of a harmonic oscillator and individual states are also remarkably regular. These results are interpreted in terms of the semiclassical picture of chords and centers. 相似文献
14.
Sun R Colin E Ajitanand NN Alexander JM Barton MA DeYoung PA Drake KL Elmaani A Gelderloos CJ Gualtieri EE Guinet D Hannuschke S Jaasma JA Kowalski L Lacey RA Lauret J Norbeck E Pak R Peaslee GF Stern M Stone NT Sundbeck SD Vander Molen AM Westfall GD Yang LB Yee J 《Physical review letters》2000,84(1):43-46
For central collisions of (17-115)A MeV 40Ar+Cu, Ag, Au, an overall balance is determined for the average mass, energy, and longitudinal momentum. Light charged particles and fragments are separated into forward-focused and isotropic components in the frame of the heaviest fragment. Energy removal by the isotropic component reaches 1-2 GeV. For such high deposition energies, statistical multifragmentation models predict much more extensive nuclear disassembly than is observed. 相似文献
15.
Fujiwara M Akimune H van Den Berg AM Cribier M Daito I Ejiri H Fujimura H Fujita Y Goodman CD Hara K Harakeh MN Ihara F Ishikawa T Janecke J Kawabata T Raghavan RS Schwarz K Tanaka M Yamanaka T Yosoi M Zegers RG 《Physical review letters》2000,85(21):4442-4445
Discrete Gamow-Teller (GT) transitions 176Yb-->176Lu at low excitation energies have been measured via the ( 3He,t) reaction at 450 MeV and at 0 degrees. For 176Yb, two low-lying states are observed, setting low thresholds Q(nu) = 301 and 445 keV for neutrino ( nu) capture. Capture rates estimated from the measured GT strengths, the simple two-state excitation structure, and the low Q(nu) in Yb-Lu indicate that Yb-based nu detectors are well suited for a direct measurement of the sub-MeV solar electron-neutrino ( nu(e)) spectrum including pp neutrinos. 相似文献
16.
K. V. Khishchenko M. V. Zhernokletov I. V. Lomonosov Yu. N. Sutulov 《Technical Physics》2005,50(2):197-201
The shock adiabat of porous stilbene (1,2-diphenylethylene) up to the pressure P = 41 GPa and the dynamic compressibility of this material in reflected shock waves up to 77 GPa are studied experimentally.
The run of the expansion isentropes of stilbene down to 0.1 GPa is determined. The experimental findings are used to construct
a semi-empiric equation of state of stilbene for a wide range of high-energy states. 相似文献
17.
V. E. Fortov V. V. Yakushev K. L. Kagan I. V. Lomonosov V. I. Postnov T. I. Yakusheva A. N. Kuryanchik 《JETP Letters》2001,74(8):418-421
The experimental investigation of lithium compressed by multiple shock waves to a pressure of 210 GPa demonstrates the abnormal dependence of electrical resistivity. Contrary to normal metal behavior, the resistivity monotonically increases in the pressure range 30–150 GPa by more than 15 times from a typical metallic value at ambient conditions and reverts to a metallic value at a pressure higher than 160–210 GPa. The obtained results demonstrate the anomalous resistivity of lithium both in solid and in liquid states. 相似文献
18.
D.N. Nikolaev M.I. Kulish S.V. Dudin V.B. Mintsev I.V. Lomonosov V.E. Fortov 《等离子体物理论文集》2021,61(10):e202100113
Measurements of the brightness temperature and compressibility of a dense silicon plasma formed by powerful shock waves (SWs) passing through a single-crystal sample have been carried out. Plane SWs were created using an explosive technique: the traditional plane acceleration of a steel driver plate made it possible to obtain pressures in silicon up to 133 GPa, and the use of “Mach” cumulative generators realized the pressures up to 510 GPa. The shock Hugoniot of silicon was determined by the impedance matching with α-quartz as the reference. The intensity of emitted thermal radiation was measured in the infrared range λ ∼ 1.5 μm, where silicon is optically transparent, and in the visible range of the spectrum. A significant (up to five times) understatement of the measured values of the brightness temperature in comparison with the values calculated by the equation of state was found. Taking into account the reflective properties of the SW in silicon does not lead to an agreement with the experiment. The estimates of relaxation processes behind the shock front suggest the presence of a zone of the establishment of ionization equilibrium with a width of ∼10 μm. 相似文献
19.
Shock waves and equations of state of matter 总被引:1,自引:0,他引:1
The physical properties of hot dense matter over a broad domain of the phase diagram are of immediate interest in astrophysics,
planetary physics, power engineering, controlled thermonuclear fusion, impulse technologies, enginery, and several special
applications. The use of intense shock waves in dynamic physics has made the exotic high-energy density states of matter a
subject of laboratory experiments and enabled advancing by many orders of magnitude along the pressure scale to range into
the megabars and even gigabars. The present report reviews the contribution of shock-wave methods to the problem of the equation
of state (EOS) at extreme conditions. Experimental techniques for high-energy density cumulation, the drivers of intense shock
waves, and methods for the fast diagnostics of high-energy matter are considered. It is pointed out that the available high
pressure and temperature information covers a broad range of the phase diagram, but only irregularly and, as a rule, is not
thermodynamically complete; its generalization can be done only in the form of a thermodynamically complete EOS. As a practical
example, construction of multi-phase EOS for iron is presented. The model’s results are shown for numerous shock-wave data,
the high-pressure melting and evaporation regions and the critical point of iron. 相似文献
20.
Previously reported spin orientation fluctuations of the amorphous Fe81B19 alloy at temperatures well below the onset of crystallization were directly shown by the time scanning experiment at 250
°C. The connection of this effect with the magnetostriction field and α-Fe nuclei at the contact surface was proved by the
CEMS spectra and by vanishing the effect at both the etched-off Fe81B19 and a zero magnetostriction samples. 相似文献