Yoichiro Suzuki - Böcker

The proceedings focuses on the recent developments in the physics of unstable nuclei. The topics include: masses and radii of exotic nuclei, structure and decay of unstable nuclei, neutron-halo and excitations of neutron drip-line nuclei, new aspects of reaction dynamics induced by exotic nuclear projectiles, production and reactions of radioactive nuclear beams, and synthesis of superheavy elements.

The aim of this workshop was to put together the efforts from various fields necessary for understanding neutrino oscillations in detail, from both experimental and theoretical points of view. One of the main experimental issues was to understand the absolute flux of both the atmospheric and the solar neutrinos in order to obtain detailed parameter information on neutrino oscillations.The proceedings contain many discussions on phenomenology and theories about neutrino mass and oscillations. The topics include: solar neutrino oscillations; neutrino mixing and the neutrino mass matrices; the origin of the neutrino masses; long baseline neutrino oscillation experiments; KamLAND and low energy neutrino measurements. Related subjects such as μ-eγ experiments and proton decay are also discussed.

This proceedings volume presents discussions on the technical aspect of the detection of low energy solar neutrinos. Most of the problems related to the experiments aiming to measure low energy solar neutrinos are dealt with.

This work covers topics such as the latest solar neutrino results in super-kamiokande, weak current in deuterium, proton decay in the semi-simple unification model, and four puzzles of neutrino mixing.

The discovery of neutrino oscillations in 1998 initiated efforts to form a group to work on the detailed study of the phenomenon; this study is now supported by a grant-in-aid in the specific field of neutrinos from the Japanese Ministry of Education, Culture and Sports. The aim of this working group is to put together the efforts from various fields necessary for understanding neutrino oscillations in detail from both the experimental and the theoretical point of view. The 4th International Workshop on Neutrino Oscillations and Their Origin was held to discuss recent progress in both experimental and theoretical study.