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[en] In this talk a review of the developments in radioactive decay processes that have taken place during the last Century, and the great outgrowths of these developments in Modern Physics, is presented.
[en] The article describes the selection of samples of charm and beauty mesons, exclusively or semi-exclusively reconstructed on data collected in 2010. These samples have been used to calibrate the flavour tagging algorithms (through the selection of pure, or heavily enriched, b-jets samples) and for measurements of direct physical interest (b-hadrons production cross section).
[en] We have used the CLEO II detector to study the multiplicity of charged particles in the decays of B mesons produced at the Υ(4S) resonance. Using a sample of 1.5x106 B meson pairs, we find the mean inclusive charged particle multiplicity to be 10.71±0.02-0.15+0.21 for the decay of the pair. This corresponds to a mean multiplicity of 5.36±0.01-0.08+0.11 for a single B meson. Using the same data sample, we have also extracted the mean multiplicities in semileptonic and nonleptonic decays. We measure a mean of 7.82±0.05-0.19+0.21 charged particles per BB(bar sign) decay when both mesons decay semileptonically. When neither B meson decays semileptonically, we measure a mean charged particle multiplicity of 11.62±0.04-0.18+0.24 per BB(bar sign) pair. (c) 2000 The American Physical Society
[en] Using an effective Hamiltonian approach, we obtain expressions for hyperon β decay final-state baryon polarization. Terms through second order in the energy release are retained. The resulting approximate expressions are much simpler and more compact than the exact expressions, and they agree closely with them. (c) 1999 The American Physical Society
[en] The analysis of recent results from solar and atmospheric neutrino experiments suggest next generation double-beta decay experiments sensitive to effective electron neutrino masses on the order of 0.05 eV could result in the direct observation of Ov double beta decay
[en] Beta minus, beta plus and electron capture decay of atomic nuclei are explained as weak interactions. Continuous beta spectra are mathematically described in the relativistic and non-relativistic regions. The interaction of beta particles with matter is described by the absorption law. A table of energies and ranges of beta particles in aluminium is given for selected nuclides. The range of beta particles in dependence on energy is expressed by an empirical relation. Problems are discussed related to measuring beta activities (selfabsorption, self-scatterring, and backscattering from the backing piece). (E.F.)
[en] A phenomenological description of ionization events is given that applies to both shaking transitions of the composite nucleus-atom system and the process in which the charged particles emitted in a nuclear decay transfer energy by a relatively slow ''direct collision'' final state interaction with atomic electrons. Specific areas covered include shakeoff in internal conversion, shakeoff in electron capture, shakeoff in beta decay, and inner electron ejection in alpha decay. (5 figs., 1 table)