G eant 4 is a toolkit for simulating the passage of particles through matter. It includes a complete range of functionality including tracking, geometry, physics models and hits. The physics processes offered cover a comprehensive range, including electromagnetic, hadronic and optical processes, a large set of long-lived particles, materials and elements, over a wide energy range starting, in some cases, from 250 eV and extending in others to the TeV energy range. It has been designed and constructed to expose the physics models utilised, to handle complex geometries, and to enable its easy adaptation for optimal use in different sets of applications. The toolkit is the result of a worldwide collaboration of physicists and software engineers. It has been created exploiting software engineering and object-oriented technology and implemented in the C++ programming language. It has been used in applications in particle physics, nuclear physics, accelerator design, space engineering and medical physics.

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Geant4—a simulation toolkit

Geant4 - A Simulation Toolkit

* Caring for children * The origins of attachment theory * Psychoanalysis as art and science * Psychoanalysis as a natural science * Violence in the family * On knowing what you are not supposed to know and feeling what you are not supposed to feel * The role of attachment in personality development * Attachment, communication, and the therapeutic process * Developmental psychiatry comes of age

A Secure Base. Parent-Child Attachment and Healthy Human Development. New York (Basic Books) 1988.

More is different.

Feshbach resonances are the essential tool to control the interaction between atoms in ultracold quantum gases. They have found numerous experimental applications, opening up the way to important breakthroughs. This review broadly covers the phenomenon of Feshbach resonances in ultracold gases and their main applications. This includes the theoretical background and models for the description of Feshbach resonances, the experimental methods to find and characterize the resonances, a discussion of the main properties of resonances in various atomic species and mixed atomic species systems, and an overview of key experiments with atomic Bose-Einstein condensates, degenerate Fermi gases, and ultracold molecules.

Victor F. Weisskopf

Papers

A Model of the Nucleus

Search for Simplicity: The cohesive energy of solids

The need for basic research.

Search for Simplicity: Chemical energy

Bicentennial Address: Frontiers and Limits of Physical Sciences