No abstract available

No abstract available

[en] The author describes the part of his scientific work connected to the research made by Enrico Fermi in the field of nuclear reactions. He said that 'Our gratitude to Fermi today is therefore due less perhaps for his reactor than for his experiments using uncharged neutrons in order to bring about artificial nuclear processes'

[en] A steady expansion of nuclear capacity in the European Community is one of the major ways of preventing unacceptable rises in oil imports. Over the period 1978 to 1985, the creation of the necessary nuclear capacity will require about Pound42000 million, and to help utilities Euratom is prepared to provide loans up to 20 per cent of the total investment cost of a project. The purpose is to complement, not replace, traditional financing resources. Fuel cycle facilities may be prominent in future loans. (U.K.)

[en] We present simple algorithmic Feynman rules for fermion-number-violating interactions. They do not involve explicit charge-conjugation matrices and resemble closely the familiar rules for Dirac fermions. We insist on a fermion flow through the graphs along fermion lines and get the correct relative signs between different interfering Feynman graphs as in the case of Dirac fermions. We only need the familiar Dirac propagator and fewer vertices than in the usual treatment of fermion-number-violating interactions. (orig.)

[en] With the study of three specific molecules, Na₃(C²E double-prime), HCN(X¹Σ⁺), and O₃(D¹B₂), each showing a distinctly different dynamical behavior at the energies studied, we show how techniques of nonlinear classical mechanics can be applied to simulate low resolution vibrational spectra and to extract the underlying dynamics from them. Particularly the importance of the single unstable periodic orbits in the chaotic regions of phase space is demonstrated

[en] We use ∼8600 COSMOS galaxies at mass scales >5 x 10¹⁰ M _sun to study how the morphological mix of massive ellipticals, bulge-dominated disks, intermediate-bulge disks, disk-dominated galaxies, and irregular systems evolves from z = 0.2 to z = 1. The morphological evolution depends strongly on mass. At M > 3 x 10¹¹ M _sun, no evolution is detected in the morphological mix: ellipticals dominate since z = 1, and the Hubble sequence has quantitatively settled down by this epoch. At the 10¹¹ M _sun mass scale, little evolution is detected, which can be entirely explained by major mergers. Most of the morphological evolution from z = 1 to z = 0.2 takes place at masses 5 x 10¹⁰-10¹¹ M _sun, where (1) the fraction of spirals substantially drops and the contribution of early types increases. This increase is mostly produced by the growth of bulge-dominated disks, which vary their contribution from ∼10% at z = 1 to >30% at z = 0.2 (for comparison, the elliptical fraction grows from ∼15% to ∼20%). Thus, at these masses, transformations from late to early types result in diskless elliptical morphologies with a statistical frequency of only 30%-40%. Otherwise, the processes which are responsible for the transformations either retain or produce a non-negligible disk component. (2) The disk-dominated galaxies, which contribute ∼15% to the intermediate-mass galaxy population at z = 1, virtually disappear by z = 0.2. The merger rate since z = 1 is too low to account for the disappearance of these massive disk-dominated systems, which most likely grow a bulge via secular evolution.

[en] Materials - bones, artifacts, artwork,.... - lie at the heart of both archaeology and art conservation. Synchrotron radiation techniques provide powerful ways to interrogate these records of our physical and cultural past. In this workshop we will discuss and explore the current and potential applications of synchrotron radiation science to problems in archaeology and art conservation. This document gathers the abstracts of the presentations