Investigation of the ηη system in π − p interactions at a momentum of 32.5 GeV/c at the GAMS-4π spectrometer

The ηη system produced in charge-exchange π ^? p interaction at a momentum of 32.5 GeV/c is studied in an experiment performed with the GAMS-4π spectrometer at the 70-GeV accelerator of the Institute for High-Energy Physics (IHEP, Protvino). A partial-wave analysis is performed in the mass range between 1.1 and 3.9 GeV for ?t <0.2 (GeV/c)², S, D, G, and J waves being taken into account in this analysis. The S wave has a complicated structure, displaying peaks at about 1.5 and 1.7 GeV. These peaks are associated with the f ₀(1500) and f ₀(1710) mesons. One of the solutions (preferable one) involves the f ₀(2200) and f ₂(1950) resonances. The mass region above 2.4 GeV is dominated by the G wave. A broad state of mass about 3 GeV and width 0.7 GeV is found in the J wave. The parameters of the resonances in question and their production cross sections are measured.     

Fluctuations of partially coherent radiation for steady-state thermal self-action

Institute of Atmospheric Optics, Siberian Branch, Academy of Sciences of the USSR. Translated from Izvestiya Vysshikh Uchebnykh Zavedenii, Radiofizika, Vol. 31, No. 7, pp. 816–822, July, 1988.     

Tetracyclines

Summary From butadiene-naphthoquinone adducts we prepared 1,2,3,4,4a,9a,-hexahydro-10-hydroxyanthrones with a 4a,9a,10-cis-cis configuration and with various functional groups in the 2- and 3-positions that are necessary for the further synthesis of compounds allied to natural 6-demethyltetracyclines.The authors thank L. B. Senyavina of the Institute for the Chemistry of Natural Products of the Academy of Sciences of the USSR for carrying out the spectroscopic measurements.