[en] The inclusive reaction γN→e⁺e^- + ... is examined taking into account the polarization of the photon, nucleon and leptons. The results apply also to the exclusive reaction γN→e⁺e^-N by taking the elastic limit of the structure functions. (author)

[en] Experimental research on hadron-hadron and proton-nucleon interactions is summarized. Emphasis is placed on data processing

[en] The various forms of superfluidity in nuclei, nuclear and neutron matter are characterized by the relevance of strong nucleon-nucleon correlations as well as by gap value which can be a substantial fraction of the Fermi energy. A microscopic many-body theory of the nuclear superfluidity is presented. The influence if the different physical effects is analyzed within the Green function formalism and the Bethe-Brueckner-Goldstone expansion. In particular, dispersive effects are discussed in details. The open problems that must be solved before a full understanding of nuclear superfluidity can be achieved are pointed out

[en] The elastic γ-nucleon scattering represents an indirect powerful method for the nucleon structure investigation. Some theoretical aspects of this problem are treated in the presented thesis. After a general introduction into the subject and a short review of the up-to-date literature, the first chapter contains kinematics and dynamical preliminaries of reaction γ+N→γ+N. In chapter II, the low energy theorems are discussed and extended up to six power in the photon laboratory energies, ω; the six structure dependent constants which appear in the differential cross section in this order are defined and computed, and an extraction for the proton electromagnetic polarizabilities α,β from the experimental data is performed. A new dispersive analysis of the γ+N→γ+N process at photon laboratory energies lower than 450 Mev is introduced and used for numerical calculation in chapter III; some improvements are obtained in the comparison with the experimental data, with respect to other previous calculations. In the last chapter, two different sum rules for the difference (α-β) are established and numerically computed - these theoretical predictions agree with the values extracted from experience; based on the analyticity properties of the invariant amplitudes, an inequality is written down connecting an integral over the differential cross section of the process and the static properties of the nucleon (mass, charge, anomalous magnetic moment). (author)

No abstract available

[en] The influence of nonstatic effects in reactions involving high momentum transfer on the residual nucleons is investigated explicitely for γ,p processes. It is found that for energies well below the 33 resonance nonstatic effects have only a slight influence on the cross section

[en] A key step in understanding the high energy particle populations and their emissions in active galactic nuclei and their plasma jets is a thorough consideration of photomeson production. Utilizing elementary particle physics phenomenology we calculate here the energy distribution of secondary pions arising from photon-proton collisions. The highly relativistic protons necessary for pion production in a radiation field are expected to be generated in shockwaves by the first-order Fermi process up to ∼10¹² GeV in the hot spots of radio galaxies and up to ∼10⁹ GeV in the compact cores. Due to the pion decay the resulting primary spectrum for the decay products high energy photons, neutrinos, electrons and positrons is basically the same. An electromagnetic cascade reprocessing the injected power of the pion decay products will feed back with the photon field and hence with the proton energy distribution. The photons emanating from this process can supply the majority of an AGN's hard X-ray and γ-ray luminosity which indeed has been shown to be linked to the nonthermal radio and infrared luminosity. This contrasts with models supporting the idea that either thermal comptonization or unresolved line emission is responsible for the high X-ray and γ-ray luminosity of AGN. We show that a rising p-γ interaction cross section expected from the hadronic properties of the photon could be detectable directly through the neutrino spectra of sources where relativistic protons cool in a nonthermal radiation field. The jet events could generate a hard component showing up above 10⁵ GeV pion energy in the particle injection distribution possibly leading to spectral signatures in the γ-ray emission of active galaxies

[en] The new code CCC-0514-ANISN/PC is described, as well as a ''GENERAL DESCRIPTION OF ANISN/PC code''. In addition to the ANISN/PC code, the transmittal package includes an interactive input generation programme called APE (ANISN Processor and Evaluator), which facilitates the work of the user in giving input. Also, a 21 group photon cross section master library FLUNGP.LIB in ISOTX format, which can be edited by an executable file LMOD.EXE, is included in the package. The input and output subroutines are reviewed. 6 refs, 1 fig., 1 tab

No abstract available

[en] Activities on the general-purpose and special-purpose files of JENDL are described. Evaluation work for the general-purpose file JENDL-4 has started in order to provide users with high-quality data. Part of the JENDL High Energy File and the JENDL Photonuclear Data File were released this year. Nuclear model codes are developed so as to make evaluations efficiently. The nuclear data utilization system is being created to disseminate JENDL data