Macroscopic quantum superpositions in highly-excited strongly-interacting many-body systems

We demonstrate a break-down in the macroscopic (classical-like) dynamics of wave-packets in complex microscopic and mesoscopic collisions. This break-down manifests itself in coherent superpositions of the rotating clockwise and anticlockwise wave-packets in the regime of strongly overlapping many-body resonances of the highly-excited intermediate complex. These superpositions involve $\sim 10^4$ many-body configurations so that their internal interactive complexity dramatically exceeds all of those previously discussed and experimentally realized. The interference fringes persist over a time-interval much longer than the energy relaxation-redistribution time due to the anomalously slow phase randomization (dephasing). Experimental verification of the effect is proposed.Comment: Title changed, few changes in the abstract and in the main body of the paper, and changes in the font size in the figure. Uses revTex4, 4 pages, 1 ps figur

Phase shift analysis of 12^{12}C ion elastic scattering measured at very high energy

We present a system for mapping the structure of research topics in a corpus. TermWatch portrays the "aboutness" of a corpus of scientific and technical publications by bridging the gap between pure statistical approaches and symbolic techniques. In the present paper, an experiment on unsupervised textmining is performed on a corpus of scientific titles and abstracts from 16 prominent IR journals. The preliminary results showed that TermWatch was able to capture low occurring phenomena which the usual clustering methods based on co-occurrence may not highlight. The results also reflect the expressive power of terminological variations as a means to capture the structure of research topics contained in a corpus

MISE EN EVIDENCE DES ETATS 2p-1t DE 170 PAR REACTION DE DOUBLE STRIPPING SUR L'AZOTE-15

La réaction 15N(3He, p)170 a été étudiée avec le faisceau de 18 MeV d'ions 3He de l'accélérateur Tandem Van de Graaff de Saclay. Une analyse D.W.B.A. des distributions angulaires suivant le formalisme de N.K. Glendenning confirme les prévisions générales des calculs du modèle des couches effectués par A.P. Zuker et al.The 15N(3He, p)170 reaction was performed with the 18 MeV 3He beam of the Saclay E.N. Van de Graaff Tandem accelerator. A D.W.B.A. angular distribution analysis using the N.K. Glendenning two nucleons transfer formalism for the form factor calculation bears out clearly the general previsions of the A.P. Zuker et al. shell model calculation of 170 nucleus

Several applications of the DWBA diffractional model to quasi-elastic reactions induced by heavy ions

SIGLEAvailable from CEN Saclay, Service de Documentation, 91191 - Gif-sur-Yvette Cedex (France) / INIST-CNRS - Institut de l'Information Scientifique et TechniqueFRFranc