No abstract available

[en] The authors present measurements of the neutron lifetime (τ_n) carried out with a gravitational trap for ultracold neutrons. They show that statistical uncertainty in the measured storage time is the principal contributor to experimental error. Measurements using oxygen-coated traps yield τ_n = 888.4 ± 3.1_stat ± 1.1_systs. Since the systematic errors derive from a large number of independent factors, they quote a final value of τ_n = 888.4 ± 3.3 s. 9 refs., 6 figs., 3 tabs

[en] Safe management of operating lifetimes of Nuclear Power Plants is a subject of prime interests. As the design life of the Nuclear Power Plant will be ended in 2008, an appropriate procedure for the design life re-assessment or lifetime extension is necessary in Korea. Therefore, the objective of this work is to develop procedural requirements which can be applied to the regulation of lifetime management or life extension of Nuclear Power Plants in Korea. Review on the linkage of the PSR with the extension of the operating lifetime of Nuclear Power Plants was performed to enhance the utilization of PSR results and analysis of the insufficiencies in the license rule in Korea

[en] Actual observation data are used to show that the course of the relative sunspot number R is fully determined by the number of sunspot groups f₀ formed per unit time and their average lifetime T₀. The approximate numerical value of the coefficient K in the formula R=Kf₀T₀ is determined and discussed simultaneously. (author)

[en] The disagreement between theoretical and experimental values of the orthopositronium decay rate (the lifetime) is described, and possible reasons of its existence are discussed. The new experiment setting-up promising to improve significantly the measurement precision is briefly presented

[en] The objective of this work is to determine the chemical composition of nanometer precipitates responsible for irradiation hardening and embrittlement of reactor pressure vessel steels, which threaten to limit the operating lifetime of nuclear power plants worldwide. The scientific approach incorporates computational multiscale modeling of radiation damage and microstructural evolution in Fe-Cu-Ni-Mn alloys, and experimental characterization by positron annihilation spectroscopy and small angle neutron scattering. The modeling and experimental results are

[en] Charmed meson pairs have been photoproduced coherently on an active multilayer silicon target in the energy range 80-150 GeV. D antiD and F antiF state have been identified and an estimate of the lifetimes is given

[en] There are a number of ways in which solenoid valve lifetime can be extended, thereby improving plant availability and reducing operating costs. These are outlined. (author)

[en] This a brief summary of the communications describing the experimental projects on the determination of the nucleon lifetime and on the study of its decay modes. The large water Cerenkov detector and the calorimeters are presented

No abstract available