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61.
T. Kozlowski W. Bertl H.P. Povel U. sennhauser H.K. Walter A. Zglinski R. Engfer CH. Grab E.A. Hermes H.P. Isaak A. Van Der Schaaf J. Van Der Pluym W.H.A. Hesselink 《Nuclear Physics A》1985,436(4):717-732
Inclusive energy spectra and the energy dependence of the asymmetry parameter have been measured for neutrons emitted after muon capture in O, Si, Ca and Pb. In addition a neutron-neutron coincidence measurement has been performed for Ca. The results of these measurements confirm the exponential shape of the energy spectra and the positive asymmetry observed by Sundelin and Edelstein. The observation of neutrons with energies above 50 MeV and the observation of simultaneous emission of two high-energy neutrons suggest the importance of short-range nucleonnucleon correlations in this process. 相似文献
62.
G.K. Aslanov G.M. Niftiev O.B. Tagiev CH.M. Briskina V.F. Zolin V.M. Markushev 《Journal of luminescence》1985,33(2):135-140
Photoluminescence of chalcogenides of europium-gallium, EuGa2S4 and EuGa2Se4, doped with neodymium is investigated. The positions of Stark levels are determined from the spectra. The symmetry of luminescence centres is shown to be lower than cubic and the existence of nonequivalent centers is established. At 77 K the decay time of luminescence from the excited levels of Nd3+ depends on the spin of the states. That indicates a slow relaxation rate in the crystals under investigation. It is probable that these crystals can be used as effective luminophores. 相似文献
63.
Journal d'Analyse Mathématique - 相似文献
64.
F. Bergsma J. Dorenbosch M. Jonker C. Nieuwenhuis J. V. Allaby U. Amaldi G. Barbiellini L. Barone A. Capone W. Flegel L. Lanceri M. Metcalf J. Panman R. Plunkett C. Santoni K. Winter I. Abt J. Aspiazu F. W. Büsser H. Daumann P. D. Gall T. Hebbeker F. Niebergall P. Schütt P. Stähelin V. Gemanov P. Gorbunov E. Grigoriev V. Kaftanov V. Khovansky A. Rosanov A. Baroncelli R. Biancastelli B. Borgia C. Bosio M. Diemoz U. Dore F. Ferroni E. Longo L. Luminari P. Monacelli F. de Notaristefani L. Tortora V. Valente CHARM Collaboration 《Zeitschrift fur Physik C Particles and Fields》1984,24(3):217-218
A search for fractionally chargedQ=1/3 (2/3) particles of different properties of interaction produced in (anti)neutrino-nucleus and in protonnucleus collisions was performed using the scintillator system of the CHARM neutrino detector at the CERN SPS. No events of the cases considered were found. In (anti)neutrino beams production was found to be less than a few times 10?5 per interaction of a beam particle. In a proton beam an upper limit on the production cross section of ~10?40 cm2 was obtained. 相似文献
65.
Linear delay difference equations with variable coefficients and constant delays are considered. By the use of an appropriate solution of the so called generalized characteristic equation, an asymptotic result is obtained and a stability criterion is established. 相似文献
66.
67.
68.
Femtosecond photon echoes from band-to-band transitions in GaAs 总被引:1,自引:0,他引:1
Becker PC Fragnito HL Brito Cruz CH Fork RL Cunningham JE Henry JE Shank CV 《Physical review letters》1988,61(14):1647-1649
69.
Milan CH. Dutta Kaushik Chanda Jai N. Vishwakarma 《Journal of heterocyclic chemistry》2005,42(1):121-123
A facile one‐pot synthetic strategy has been developed for novel [alkanediylbis(3‐alkyl/aralkyl/ aryl‐3,6‐dihydropyrimidine‐1,5(2H)‐diyl)]bis(arylmethanones) 2a‐c, 2e‐m and [1,4‐phenylenebis(3‐phenyl‐3,6‐dihydropyrimidine‐1,5(2H)‐diyl)]bis(phenylmethanone) 2d by refluxing enaminones 1a‐f in methanol with diamines and formaldehyde. 相似文献
70.
Hellberg F Zhaunerchyk V Ehlerding A Geppert WD Larsson M Thomas RD Bannister ME Bahati E Vane CR Osterdahl F Hlavenka P af Ugglas M 《The Journal of chemical physics》2005,122(22):224314
This paper presents results concerning measurements of the dissociative recombination (DR) of dihydrogen sulfide ions. In combination with the ion storage ring CRYRING an imaging technique was used to investigate the breakup dynamics of the three-body channel in the DR of 32SD2(+). The two energetically available product channels S(3P) + 2D(2S) and S(1D) + 2D(2S) were both populated, with a branching fraction of the ground-state channel of 0.6(0.1). Information about the angle between the two deuterium atoms upon dissociation was obtained together with information about how the available kinetic energy was distributed between the two light fragments. The recombination cross sections as functions of energy in the interval of 1 meV to 0.3 eV in the center-of-mass frame are presented for 34SH2(+). The thermal rate coefficient for the DR of 34SH2(+) was determined to be (4.8+/-1.0) x 10(-7)(T/300)(-0.72+/-0.1) cm3 s(-1) over this interval. 相似文献