排序方式: 共有63条查询结果,搜索用时 15 毫秒
41.
L. N. Bogdanova V. R. Bom A. M. Demin D. L. Demin C. W. E. van Eijk S. V. Filchagin V. V. Filchenkov N. N. Grafov S. K. Grishechkin K. I. Gritsaj A. D. Konin A. V. Kuryakin S. V. Medved’ R. K. Musyaev A. I. Rudenko D. P. Tumkin Yu. I. Vinogradov A. A. Yukhimchuk S. A. Yukhimchuk V. G. Zinov S. V. Zlatoustovskii 《Journal of Experimental and Theoretical Physics》2009,108(2):216-225
The muon-catalyzed fusion (μCF) process in tritium was studied by the μCF collaboration on the muon beam of the JINR Phasotron.
The measurements were carried out with a liquid tritium target at the temperature 22 K and density approximately 1.25 of the
liquid hydrogen density (LHD). Parameters of the μCF cycle were determined: the ttμ muonic molecule formation rate λ
ttμ = 2.84(0.32) μs−1, the ttμ fusion reaction rate λ
f
= 15.6(2.0) μs−1, and the probability of muon sticking to helium ω
tt
= 13.9(1.5)%. The results agree with those obtained earlier by other groups, but better accuracy was achieved due to our unique
experimental method.
The article is published in the original. 相似文献
42.
M. A. Mochalov R. I. Il’kaev V. E. Fortov A. L. Mikhailov V. A. Arinin A. O. Blikov A. Yu. Baurin V. A. Komrakov V. A. Ogorodnikov A. V. Ryzhkov A. A. Yukhimchuk 《JETP Letters》2012,96(3):158-163
The quasi-isentropic compressibility of a helium plasma has been measured using a spherical experimental chamber, as well as an X-ray diffraction complex consisting of three betatrons and a multichannel optoelectronic system for the detection of X-ray images. The density of the compressed helium plasma of about 8 g/cm3 has been obtained in the experiment at a pressure of 5000 GPa. Analysis of the data indicates that helium at the measured parameters is in a single ionized state. 相似文献
43.
44.
M.K. Islam S. Biswas N.A. Chowdhury A. Mannan M. Salahuddin AA Mamun 《等离子体物理论文集》2022,62(1):e202100073
A theoretical investigation has been carried out on the propagation of non-linear ion-acoustic shock waves (IASHWs) in a magnetized degenerate quantum plasma system composed of inertial non-relativistic positively charged light and heavy ions, inertialess non-relativistically or ultra-relativistically degenerate electrons and positrons. The reductive perturbation method has been employed to derive the Burgers' equation. It has been observed that under consideration, our plasma model supports only positive potential shock structure. It is also found that the amplitude and steepness of the IASHWs have been significantly modified by the variation of ion kinematic viscosity, oblique angle, number density, and charge state of the plasma species. The results of our present investigation will be helpful for understanding the propagation of IASHWs in white dwarfs and neutron stars. 相似文献
45.
Commensurability between inter-vortex distance and crystal lattice constant is investigated by angular dependent magnetization
in very pure twinned and twin-free NdBa2 Cu3 Oy single crystals. With increasing temperature the incommensurate states split up and become finally commensurate with half
the vortex distance. These new commensurate states are related to a substructure of the intrinsic pinning potential within
the unit cell and discussed with respect to temperature, field, anisotropy, and twin structure. 相似文献
46.
V. Ya. Bratus'' M. Ya. Valakh I. P. Vorona T. T. Petrenko V. A. Yukhimchuk P. L. F. Hemment T. Komoda 《Journal of luminescence》1998,80(1-4):269-273
Thermally grown SiO2 layers on Si substrates implanted with Si+ ions with a dose of 6×1016 cm−2 were studied by the techniques of photoluminescence, electron paramagnetic resonance (EPR), and low-frequency Raman scattering. Distinct oxygen-vacancy associated defects in SiO2 and non-bridging oxygen hole centers were identified by EPR. The luminescence intensity in the 620 nm range was found to correlate with the number of these defects. The low-frequency Raman scattering technique was used to estimate the average size of the Si nanocrystallites formed after the implantation and thermal annealing at T>1100°C, which are responsible for the photoluminescence band with a maximum at 740 nm. The intensity of this band can be significantly enhanced by an additional treatment of the samples in a low-temperature RF plasma. 相似文献
47.
MJ Lazaro AA Herod M Domin Y Zhuo CA Islas R Kandiyoti 《Rapid communications in mass spectrometry : RCM》1999,13(14):1401-1412
Three methods for determining a 'safe' estimate for high-mass limits of MALDI spectra of coal derived liquids were explored, using a sample of coal-tar pitch and its pyridine-insoluble fraction. Co-addition of increasing numbers of single-shot spectra (10, 30, 50 and 100 pulses) showed visually observable reductions in noise levels, consistent with robust and statistically meaningful signals. Three separate types of post-acquisition calculation were used to identify high-mass limits of the spectra. (i) A literature method indicated high-mass limits similar to those observed visually-as a shift from baseline at the highest masses, nearly 350 000 u for the coal tar pitch and about 390 000 u for its pyridine insoluble fraction. (ii) Comparing instrument signal with pre-selected multiples of the standard deviation, upper mass estimates of between 40-60 000 u for the coal-tar pitch and about 95 000 u for its pyridine-insoluble fraction were found. (iii) Calculation of the slope was used to identify 'lift-off' of the spectrum from baseline. The angle between the smoothed spectrum and the baseline was matched to a pre-selected value (e.g. 0.5 degrees and 1 degrees ). However, the arbitrary specification of the key parameter did not establish this last method on a firm basis. The choice of a criterion for estimating high-mass limits of MALDI spectra remains a semi-quantitative procedure; a reasonably conservative high-mass limit may be estimated by comparison of signal with five times the standard deviation. However, evaluation of size exclusion chromatograms of the present samples using polystyrene standards suggests that molecular mass distributions of pitch samples arrived at by MALDI mass spectrometry are, at least partly, determined by the limitations of available instruments. Copyright 1999 John Wiley & Sons, Ltd. 相似文献
48.
V.V. Perevozchikov A.A. Yukhimchuk D.L. Demin N.S. Ganchuk V.G. Grebinnik S.K. Grishechkin P.D. Ishkov Yu.A. Khabarov V.N. Lobanov I.L. Malkov V.I. Tikhonov V.G. Zinov 《Hyperfine Interactions》1999,119(1-4):353-355
The design of a tritium high pressure target with a volume of 16.5 cm3, developed at the RFNC-VNIIEF for research of muon fusion catalyzed in a H-D-T hydrogen isotopic mixture at pressures up
to 120 MPa in the range of operating temperatures 300-800 K, is presented.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
49.
Yu.P. Averin D.V. Balin V.R. Bom J.N. Bradbury J.D. Davies A.M. Demin D.L. Demin A.E. Drebushko V.P. Dzhelepov C.W.E. van Eijk V.V. Filchenkov A.N. Golubkov N.N. Grafov V.G. Grebinnik S.K. Grishechkin V.G. Klevtsov A.D. Konin A.A. Kukolkin S.V. Medved' A.B. Modenov V.A. Nazarov V.V. Perevozchikov V.I. Pryanichnikov V.Ya. Rozhkov A.I. Rudenko S.M. Sadetsky G.G. Semenchuk V.T. Sidorov Yu.V. Smirenin I.I. Sukhoi V.V. Travkin N.I. Voropaev A.A. Yukhimchuk V.G. Zinov S.V. Zlatoustovskii 《Hyperfine Interactions》1999,118(1-4):111-119
Preliminary data are first presented for the measurements of effective parameters of MCF processes in dense D/T mixtures obtained
by a novel method. Results are compared with the ones obtained by the “standard” method.
This revised version was published online in August 2006 with corrections to the Cover Date. 相似文献
50.
L. N. Bogdanova V. R. Bom D. L. Demin C. W. E. van Eijk V. V. Filchenkov N. N. Grafov V. G. Grebinnik K. I. Gritsaj A. D. Konin A. V. Kuryakin V. A. Nazarov V. V. Perevozchikov A. I. Rudenko S. M. Sadetsky Yu. I. Vinogradov A. A. Yukhimchuk S. A. Yukhimchuk V. G. Zinov S. V. Zlatoustovskii 《Physics of Atomic Nuclei》2002,65(10):1778-1784
A search for the muon-catalyzed fusion (MCF) reaction d+d → 4He+γ in the ddμ muonic molecule was performed using the experimental MCF installation TRITON and NaI(Tl) detectors for γ quanta. A high-pressure target filled with deuterium was exposed to the negative muon beam of the JINR phasotron to detect γ quanta with an energy of 23.8 MeV. The first experimental estimation for the yield of radiative deuteron capture from the ddμ state J=1 was obtained at a level of ηγ≤2×10?5 per one fusion. 相似文献