Rescaling of Nuclear Structure Functions

It is shown that nucleonic structure functions are $x-$ and $Q^{2}-$rescaled in nuclei. The $x-$rescaling accounts for nuclear effects in the case of exact scaling, while the $Q^{2}-$rescaling is responsible for a corresponding modification of quantum corrections. This result is obtained in the leading order for all flavour combinations and connects the two known models for the EMC-effect. Electroproduction and gluonic nuclear structure functions are calculated.Comment: 9 pages, Latex, 2 figures appended (compressed and uuencoded

Monitoring system for proton beam transport to the irradiation facilitie

A monitoring system online controls a proton beam passage from Linac to the experimental units by measuring a secondary neutron radiation from the beam losses. The system consists of the neutron detectors in the transport path and terminal controller connected to the computer. Monitor system allows to determine the beam losses and to detect instability of the formative elements.Мониторная система в режиме реального времени контролирует прохождение пучка протонов линейного ускорителя до экспериментальных установок по вторичному нейтронному излучению от потерь пучка. Система состоит из детекторов нейтронов в канале транспортировки и терминального контроллера, соединённого с компьютером. Мониторная система позволяет определять потери пучка и контролировать работу формирующих элементов транспортного канала.Моніторна система в режимі реального часу контролює проходження пучка протонів лінійного прискорювача до ек- спериментальних установок за вторинним нейтронним випромінюванням від втрат пучка. Система складається з детек- торів нейтронів у каналі транспортування і термінального контролера, сполученого з комп'ютером. Моніторна система дозволяє визначати втрати пучка і виявляти нестабільність роботи формуючих елементів транспортного каналу

Gaseous Radiochemical Method for Registration of Ionizing Radiation and Its Possible Applications in Science and Industry

This work presents a new possibility of registration of ionizing radiation by the flowing gaseous radiochemical method (FGRM). The specified method uses the property of some solid crystalline lattice materials for a free emission of radioactive isotopes of inert gas atoms formed as a result of nuclear reactions. Generated in an ampoule of the detector, the radioactive inert gases are transported by a gas-carrier into the proportional gas counter of the flowing type, where the decay rate of the radioactive gas species is measured. This quantity is unequivocally related to the flux of particles (neutrons, protons, light and heavy ions) at the location of the ampoule. The method was used to monitor the neutron flux of the pulsed neutron target "RADEX" driven by the linear proton accelerator of INR RAS. Further progress of the FGRM may give rise to possible applications in nuclear physics, astrophysics and medicine, in the nondestructive control of fissionable materials, diagnostics of thermonuclear plasma, monitoring of fluxes and measurement of spectra of bombarding particles.Comment: 19 pages, 5 figure

Development of a detector based on a CVD-diamond for the use in radiotherapy facilities

High radiation hardness, chemical resistance, high temperature operation capabilities stimulate a growing interest to use diamond materials as detectors of ionizing radiation. Samples of CVD-diamond materials in sizes 4×3 mm and 4×1 mm with thickness from 50 microns up to 500 microns have been grown in INR RAS using a DC glow discharge in a mixture of gases CH4/H2 on molybdenum substrates.Высокая радиационная стойкость, стойкость к химическим воздействиям, температурная стабильность вызывают повышенный интерес к использованию алмазных материалов в качестве детекторов ионизирующих излучений. Образцы CVD-алмазных материалов размерами 4×3 и 4×1 мм толщиной от 50 до 500 мкм выращены в ИЯИ РАН методом газофазного осаждения в тлеющем разряде в смеси газов СН4/Н2 на подложках из молибдена.Висока радіаційна стійкість, стійкість до хімічних впливів, температурна стабільність викликають підвищений інтерес до використання алмазних матеріалів як детектори іонізуючих випромінювань. Зразки CVD-алмазних матеріалів розмірами 4×3 та 4×1 мм товщиною від 50 до 500 мкм вирощені в ІЯІ РАН методом газофазного осадження в жевріючому розряді в суміші газів СН4/Н2 на підкладках з молібдену

Double giant resonances in deformed nuclei

We report on the first microscopic study of the properties of two-phonon giant resonances in deformed nuclei. The cross sections of the excitation of the giant dipole and the double giant dipole resonances in relativistic heavy ion collisions are calculated. We predict that the double giant dipole resonance has a one-bump structure with a centroid 0.8 MeV higher than twice energy for the single giant dipole resonance in the reaction under consideration. The width of the double resonance equals to 1.33 of that for the single resonance.Comment: 5 pages, 2 postscript figure

SPIN-DEPENDENT NUCLEAR STRUCTURE FUNCTIONS: GENERAL APPROACH WITH APPLICATION TO THE DEUTERON

We study deep-inelastic scattering from polarized nuclei within a covariant framework. A clear connection is established between relativistic and non-relativistic limits, which enables a rigorous derivation of convolution formulae for the spin-dependent nuclear structure functions g_1^A and g_2^A in terms of off-mass-shell extrapolations of polarized nucleon structure functions, g_1^N and g_2^N. Approximate expressions for g_{1,2}^A are obtained by expanding the off-shell g_{1,2}^N about their on-shell limits. As an application of the formalism we consider nuclear effects in the deuteron, knowledge of which is necessary to obtain accurate information on the spin-dependent structure functions of the neutron.Comment: 26 pages RevTeX, 9 figures available upon reques