Observation of ω → π0μ+μ− decay

The results of studying the mass spectrum of μ⁺μ^?γγ systems produced in π^?p collisions at 25 and 33 GeV/c presented. The wide-aperture magnetic spectrometer with a hodoscope γ-detector was used to identify muon pairs and photons. There is a clear peak in the mass spectrum which corresponds to the decay ω → π⁰μ⁺μ^? previously not observed. The branching ratio for the decay is estimated to be 9 × 10^?5 with a systematic error of 50%.     

Investigation of the depth distribution of impurities by charged-particle activation

A method is described for the quantitative determination of the distribution of impurities, utilizing charged particles. Experimental data obtained by activation with 7.5 MeV³He ions are reported on the distribution of oxygen in Ge and Nb samples.     

Inclusive production of muon pairs and vector mesons in π−N collisions at momenta 27 and 40 GeV/c

Experimental results on the investigation of inclusive production of muon pairs and vector mesons (J/ψ, ?⁰(ω)) in π^?N collisions at 27 and 40 GeV/c momenta are presented.     

Uniqueness of diffusion generators for two types of particle systems with singular interactions

For two types of stochastic particle systems in we show non-explosion in finite time by proving that their respective generators are L¹(μ)-unique, where μ is their respective invariant (in these cases even symmetrizing) measure. We also prove the much harder L²(μ)-uniqueness in both models.     

Mn<Superscript>2+</Superscript> 3<Emphasis Type="Italic">d</Emphasis> luminescence kinetics in Zn<Subscript>1−<Emphasis Type="Italic">x</Emphasis></Subscript>Mn<Subscript>x</Subscript>Se

Intracenter luminescence (IL) of Mn²⁺ in Zn_1?xMn_xSe (x=0.07, 0.02) was studied under pulsed excitation by the neodymium laser second harmonic. At 4 K, the IL saturation originates from the nonlinearity of the system only at the instant of excitation, the IL decay kinetics after the exciting pulse termination depending only weakly on the pumping level. At 77 K, the decay kinetics in Zn_0.93Mn_0.07Se depends substantially on the pumping level, because the migration of intracenter excitation over the manganese ions initiates up-conversion, which is a slow nonlinear process. As shown by IL decay measurements in Zn_0.98Mn_0.02Se (x=0.02), excitation migration over the Mn²⁺ ions is insignificant even at a high temperature and under strong optical pumping.     

Holographic interference microscope for laboratory studies

A digital holographic interference microscope is designed that allows real-time 3D imaging of phase microobjects and measurement of their morphological parameters. The instrument may find application in medical institutions and research laboratories.     

Determination of the temperature distribution in liquids and solids using holographic interferometry

It is shown that holographic interferometry can be applied to solve two problems: heating of a glass plate by a complex heat source and nonisothermal flow of a submerged jet around a wedge. The process of isolating and numbering the skeletal lines on the interferograms is automated and direct calculations are made of the temperature fields. Zh. Tekh. Fiz. 69, 106–111 (June 1999)     

Formation of x-ray beams with the aid of a tapered microcapillary

The possibility of obtaining x-ray microbeams with a prescribed intensity using a system containing a x-ray tube with a transmission thin-film anode and a tapered glass microcapillary is investigated. Zh. Tekh. Fiz. 68, 90–93 (May 1998)     

Point Spectrum of Singularly Perturbed Self-Adjoint Operators

We study the inverse spectral problem for the point spectrum of singularly perturbed self-adjoint operators. __________ Translated from Ukrains'kyi Matematychnyi Zhurnal, Vol. 57, No. 5, pp. 654–658, May, 2005.