Lecturer: Gilbert Duchene (IReS, Strasbourg)

Title : First results with EUROBALL IV 
	and hints in the future of $\gamma$-spectroscopy

Date:   6/4/2001 (Mon.) 16:00 -

Place:  RIKEN Main Bldg. 1F Seminar Room

                           The seminar will be given in English.

Abstract:
The EUROBALL $\gamma$ spectrometer is now running routinely at IReS-Strasbourg
laboratory since june 1999. About 40 experiments have been performed for 
thestudy of the structure of atomic nuclei at extreme conditions of angular
momentum and isospin. Thanks to the use of many additional detectors
(charged particule, neutron, recoil detectors,...) phenomena with 
cross-sections as low as a few $\mu$barns are investigated. After a short
presentation of the array performances and of its additional detectors, few
examples of the physics results will be discussed.

The advent of new detection technologies (Ge electric segmentation, digital
electronics, $\gamma$-ray reconstruction,..) opens up, through the $\gamma$
tracking technique, new perspectives for both high-spin and exotic-nuclei
physicist communities. The concept of $\gamma$ tracking will be presented
as well as the two multidetector geometries based on multisegmented coaxial
and planar Ge crystals. The simulated performance in terms of observational
limit and figure of merit will be given in comparison with those of the
present spectrometers.