Дирекция Объединенного института ядерных исследований с глубоким прискорбием сообщает, что 1 мая 2010 года на 66-м году жизни скончался академик Алексей Норайрович Сисакян, директор Объединенного института ядерных исследований в Дубне, член Президиума Российской академии наук, известный физик

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Анатолий Алексеевич Логунов (к 70-летию со дня рождения), Балдин А.М., Владимиров В.С., Кадышевский В.Г., Матвеев В.А.

A geometric interpretation of the spontaneous symmetry breaking effect, which plays a key role in the Standard Model, is developed. The advocated approach is related to the effective use of the momentum 4-spaces of the constant curvature, de Sitter and anti de Sitter, in the apparatus of quantum field theory.

The Al'fa irradiation complex has been developed and built at the Joint Institute of Nuclear Research. The purpose of this complex is to irradiate polymer films used in the production of track memebranes. The complex contains an isochronous cyclotron with external ion injection, a system for extracting and transporting accelerated ions, and an irradiation setup for the initial material – a polyethylene film. The Al'fa irradiation complex can produce track membranes from polyethyleneterephtalate (lavsan) up to 25 μm thick and up to 40 cm wide.

Памяти Алексея Алексеевича Тяпкина, Вылов Ц.Д., Кадышевский В.Г., Кекелидзе В.Д., Логунов А.А., Оганесян Ю.Ц., Ольшевский А.Г., Панасюк М.И., Русакович Н.А., Савин И.А., Сисакян А.Н., Трухин В.И., Ширков Д.В.

The DELSY (Dubna electron synchrotron) accelerator complex, including a 1.2-GeV electron storage ring, is under construction at JINR. This complex is a high-luminosity source of synchrotron radiation. It contains a linear accelerator-injector and a family of free-electron lasers operating in a wide spectral range from infrared radiation (λ ≈ 100 μm) to high-energy x-rays (εω ≈ 0 keV). The DELSY source will make it possible to expand current research performed at JINR on the condensed-state and atomic physics, biology and medicine, crystallography and x-ray spectroscopy, nuclear physics, and metrology. The project is being implemented in three phases.

member of the Russian Academy of Sciences, was born on April 14, 1933. He is well known for his work on the physics of the atomic nucleus and nuclear reactions, and experiments on the synthesis of new elements of Mendeleev's periodic table and analysis of their properties. Oganesyan's entire life is closely tied with the Joint Institute of Nuclear Research (JINR), Dubna, to which he was assigned after graduating from the Moscow Engineering Physics Institute in 1956. There he went all the way up from a young engineer heading the start-and-adjustment group of theaccelerator toDirectorandScienceHeadof theGNFlerov Laboratory ofNuclear Reactions, presented and defended his PhD and later DSc theses, and gained the status of Professor and corresponding member of the Russian Academy of Sciences. He made three discoveries, produced eleven inventions, and authored amonograph andmore than 250 research papers. Yu Ts Oganesyan formulated the basic principles of synthesizing transfermium elements in reactions of `cold fusion' and together with co-workers conducted fundamental experiments on synthesizing elements with Z ˆ 100 ± 108. One of these elements Ð No. 105 Ð was assigned the name `dubnium' by the International Union of Pure and Applied Chemistry. To study increasingly heavy nuclei, Yu Ts Oganesyan launched a program of synthesis of very heavy isotopes in fusion reactions of calcium-48 with actinide targets and worked on designing and building precision experimental setups. In 1999 ± 2002 these reactions yielded for the first time elements withZ ˆ 114 and 116, whose decay properties provided direct proof of the existence of the `island of stability' for very heavy elements. Oganesyan's name is inseparable from the development of several generations of heavy-current accelerators of heavy ions with record parameters (U-200, U-300, U-400 and U-400M). A unique research facility had been created on the basis of the cyclotron complex and present-day experimental equipment (kinematic separators and 4p-spectrometers of charged particles, neutrons, and g-quanta); this complex sustains the leading position of JINR in a number of research fields in nuclear physics. Yu Ts Oganesyan continues to work fruitfully, retaining his leading status in heavy ion physics and organizing efficient collaboration with the leading laboratories of Europe, Asia, and America. A unique accelerator complex for experiments with radioactive beams is being created in Dubna under his direct guidance; also, super-modern experimental facilities are in the design and assembly stage, and promising world-class research programs are being formulated and implemented. Yu Ts Oganesyan pays careful attention to incorporating scientific achievements into practical use. Under his supervision, unique high technologies were developed at JINR for creating novel materials and producing radioactive isotopes for medical applications and ecology. As the Chairman of the Scientific Council of the Russian Academy of Sciences on Applied Nuclear Physics, Oganesyan is a coordinator of applied research in the leading nuclear-physics centers in the country. Fostering new generations of research scientists is constantly at the focal point of Oganesyan's attention. He heads the Affiliate Chair of Experimental Methods of Nuclear Physics of the Moscow Engineering Physics Institute, and chairs the PhD andDScTheses Council inDubna. Among his students from Russia and JINR member states, six hold DSc and more than 20 PhD degrees. Oganesyan's research achievements have been rewarded with the USSR State Prize (1975), the I V Kurchatov Prize (the USSR Academy of Sciences, 1989), the GN Flerov Prize (JINR, 1993), the A von Humboldt Prize (Germany, 1995), the Lisa Meitner Prize (European Physical Society, 2000), the MAIK Nauka/Interperiodika Prize (2001), and state decoraUspekhi Fizicheskikh Nauk 173 (5) 571 ± 572 (2003) Translated by V I Kisin PERSONALIA PACS number: 01.60.+q

Памяти Александра Михайловича Балдина, Кадышевский В.Г., Комар А.А., Крохин О.Н., Логунов А.А., Малахов А.И., Матвеев В.А., Осипов Ю.С., Рубаков В.А., Сисакян А.Н., Скринский А.Н., Тавхелидзе А.Н., Ширков Д.В.

The influence of intense electromagnetic fields on the formation and decay of quasistationary states of different quantum systems is investigated based on exact solutions of quantum equations for charged particle motion. The method allows examining systems where a spontaneous decay may occur as well as phenomena that occur only under the action of the field. Different values of the total magnetic moment of the system are taken into account in this consideration. A consistent use of the analytic continuation method allows obtaining nonlinear equations that determine complex energies in an external field. The asymptotic expansions for real and imaginary energy values under the action of weak and strong electromagnetic fields are investigated. The developed approach allows establishing the characteristic values for the length parameters that determine the formation of the processes in superstrong fields. We note that a significant decrease of distances in strong fields may lead to effects with a new characteristic length scale, characterizing a modified quantum electrodynamics (QED) formalism, namely, the “QED with the fundamental mass” formalism.

We investigate the influence of intense electromagnetic fields on the formation and decay of quasi-stationary states of different quantum systems. Nonlinear equations that determine complex energy values are obtained from the expressions for the probability of the processes in an external electromagnetic field using the analytic continuation method. We obtain asymptotic expansions describing the action of weak and strong electromagnetic fields. If the distances that determine the formation of the processes in superstrong fields decrease significantly, this may lead to effects whose characteristic length scale corresponds to the formalism of the modified QED, i.e., “QED with fundamental mass.”

An accelerator complex DÉLSI (Dubnen Electron Synchrotron) is planned for constuction as source of synchrotron radiation with high brightness in a wide spectral range – from far infrared (100 μm) up to high-energy x-ray (50 keV). This will make it possible to perform a wide range of research at the Joint Institute of Nuclear Research. The DÉLSI complex includes a linear electron accelerator up to energy 800 MeV and a storage ring with a 136 m perimeter at 1.2 GeV, in which a 10 T wiggler and an undulator (0.75 T, 150 periods) are built-in. The linear electron accelerator of the DÉLSI complex will be used for injection and for producing free-electron lasers. The parameters of synchrotron radiation from the bending magnets and built-in devices of the DÉLSI complex, the magnetic structure of the storage ring with the wiggler and undulator switched off, the effect of built-in devices on the ring optics, and the effect of errors on the closed orbit are examined; the synchrotron radiation parameters are briefly described.

Виктор Анатольевич Матвеев (к шестидесятилетию со дня рождения), Зацепин Г.Т., Кадышевский В.Г., Лобашев В.М., Логунов А.А., Красников Н.В., Кузьмин В.А., Новожилов Ю.В., Рубаков В.А., Ряжская О.Г., Скринский А.Н., Тавхелидзе А.Н., Ширков Д.В.

Альберт Никифорович Тавхелидзе (к семидесятилетию со дня рождения), Амаглобели Н.С., Балдин А.М., Зацепин Г.Т., Кадышевский В.Г., Лобашев В.М., Красников Н.В., Матвеев В.А., Рубаков В.А., Сисакян А.Н., Славнов А.А., Чудаков А.Е., Ширков Д.В.

Nonlinear threshold phenomena in quantum systems in a strong external electromagnetic field are investigated. A development of traditional quantum electrodynamics (QED) and a modified QED with new universal parameter, fundamental mass, are used. Analysis of the threshold phenomena in an external magnetic field is based on the modified Dirac equation in an external field. The analysis shows that the fundamental mass determines a bound on the external field strength. Dispersion relations are proved for some threshold reactions in rather general external electromagnetic fields.