Two-proton radioactivity : tracking 2He emission

Two proton radioactivity has been observed experimentally in the decay of 45Fe and 54Zn, and possibly of 48Ni. These first experiments only allowed for a limited comparison with theory: T1=2 and Q2P values. Experimental efforts have been achieved to measure dynamical observables in order to perform a more detailed study of the decay mechanism. Time projection chambers have been developped by groups of Bordeaux and Warsaw, and were successfully used at GANIL and MSU: those devices allowed for a first direct observation of the individual protons in the 2-proton radioactivity of 45Fe, and a first estimate of correlations of these protons

The delayed proton emission in the A ≃\simeq 65-77 mass region statistical aspects and structure effects

Experiences show that most readers are lost in electronic text, because they lack of global information. As a consequence, many people print electronic texts before reading them. This strange phenomenon was not predicted in the past and it could preclude the expansion of electronic reading. We propose here a way to provide some visualization of the structure of the document. That corresponds to the cartography of its overall organization. Our hope is that it could help to orient in electronic texts and consequently to facilitate electronic reading. This paper describes the origins of difficulties and then it presents all the technical details of the proposed solution

ACTAR TPC performance with GET electronics

The ACTAR TPC detector has been designed as a state-of-art detector for the tracking of ions in nuclear physics experiments. We performed various sets of test measurements with an alpha source, using a reduced size demonstrator of this device, in order to estimate the performances that can be expected from the tracks analysis. The parameters from the detector, from the electronics and from the analysis have been studied, with their influence on the energy resolution and the tracking precision. An effective full 3D charge distribution reconstruction method is also presented in order to analyze particle trajectories in any direction