[en] Short communication

[en] The (p, pπ⁺) nuclear reaction is studied within the proton energy range from the reaction threshold up to 30 GeV on ²⁷Al, ⁶⁵Cu, ⁵⁹Co, ¹¹⁵In nuclei. The experimental data obtained by the radiochemical method are collected and analysed for the values measured (reaction excitation function, angular distributions and energy spectra of recoil nuclei). A satisfactory agreement with theoretical calculation is observed. The applicability of theoretical model which uses the pole approximation with corrections for the virtuality of intermediate pion and Fermi motion of intranuclear nucleons is shown

No abstract available

[en] Kinetics of 5'-AMP hydrolysis by rat's blood serum was studied at 3, 10, 30, 90 and 180 days after chronic γ-irradiation at 0.1-1 Gy doses (⁶⁰Co sources, dose rate 4.4x10^-6 Gy/h). It was shown that more exposed kinetic anticooperativity of nucleotidase reaction in irradiated animals, as compare to control ones, was conditioned by composition predominance of low-affinity 5'-nucleotidases forms over their high-affinity patterns. The ratio of maximal velocities of high- to low-affinity 5'-nucleotidases was ranged from 2 in the control to 7 in irradiated rats at different postirradiation periods during the first 90 days of observation. It was suggested that appearance of new kinetic 5'-nucleotidases forms in blood stream of irradiated animals, predominantly with low-affinity, was attributed to impairment in the integrity of cellular membranes and may testify to postirradiation of tissues injury

[en] The paper gives an account of experience collected during the 4 years of operation of the BOR-60 reactor and after its shutdown due to defective fuel assemblies. Most of the experience relates to the radiation situation a) during operation with completely intact and partly defective fuel assemblies b) after reactor shutdown c) during rearrangement of fuel elements and refuelling, d) during maintenance work in large structural components. Information is also given on the types of radioactive isotopes in the fallout deposits and their local distribution as well as on the measured radioactivity. (GG/AK)

[en] The paper is aimed at comparing the structure of mesic K X-ray patterns of phosphorus in its crystalline modifications, comparing the structure of mesic X-ray patterns of magnesium and oxygen in compounds of MgO, MgO₂, H₂O and metallic magnesium, as well as comparison of propabilities of μ^- atomic capture in magnesium oxides. By analyzing the mesic K X-ray patterns of red and white phosphorus it is concluded that the phosphorus crystalline modification produces the effect on the line structure, the higher series number being somewhat larger for the allotrope of phosphorus with polymeric structure. A comparison is made of the mesic X-ray series of the magnesium in oxide and metal, of the oxygen in oxide and water with the analogous data for aluminium and silicon. The data confirm the supposition that chemical bond (valence electrons) plays a substantial role in meson capture

No abstract available

No abstract available

No abstract available

[en] To study the influence of matter macroscopic properties on the negative muon atomic capture the muonic X-ray spectra have been measured from silicon at 77 deg and 295 deg, from VO₂ at 295 deg and 355 deg, and from V₂O₃ at 77 deg and 295 deg using a Ge(Li) spectrometer 55 cm³ in volume and ''on-line'' technique. It is shown that neither changes of a conductivity in all targets, nor a rebuilding of both vanadium oxydes crystal structure at phase transition does not cause any alteration in muonic X-ray spectrum. The obtained results are discussed in terms of a ''time pit''