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Mechanisms of reaction and energy dissipation in the nucleus-nucleus symmetric collisions at 25 to 74 MeV/u: contribution of exclusive measurements of the INDRA multidetector; Mecanismes de reaction et de dissipation de l`energie dans les collisions symetriques noyau-noyau de 25 a 74 MeV/u: apport des mesures exclusives du multidetecteur INDRA

Abstract

This work is about the first experimental results obtained with the INDRA multidetector. First, the characterization of reaction mechanisms is performed. For complete events, global description of the collision is performed and compared with theoretical calculations. Dissipative binary mechanisms represent the largest part of the cross section for violent collisions whatever the bombarding energy (from 25 to 74 MeV/u) for the studied systems (Ar + KCl and Xe + Sn). The two outgoing products decay takes place through light charged particle and fragment emission. The reconstruction of the two primary sources is achieved, allowing thus the study of the evolution of the energy dissipation. Excitation energies exceeding 10 MeV/u are reached. The decay of the primary outgoing partners can be understood in a statistical model approach and the role of collective modes like expansion energy seems to be negligible. The study of the angular distributions points out angular momentum effects, `proximity effect` and a dynamical ternary process corresponding to the emission of a light fragment in between the two heavier products. For the most violent collisions, events can also be interpreted in terms of the multifragmentation of a single source, at least for the Xe + Sn system at 50  More>>
Authors:
Metivier, V [1] 
  1. Caen Univ., 14 (France). Lab. de Physique Corpusculaire
Publication Date:
Apr 01, 1995
Product Type:
Thesis/Dissertation
Report Number:
LPCC-T-95-03
Reference Number:
SCA: 663450; 440101; PA: AIX-29:040378; EDB-98:085082; SN: 98001989385
Resource Relation:
Other Information: DN: 91 refs.; TH: Theses (Ph.D); PBD: Apr 1995
Subject:
66 PHYSICS; 44 INSTRUMENTATION, INCLUDING NUCLEAR AND PARTICLE DETECTORS; CALIBRATION; CESIUM IODIDES; DATA ACQUISITION; DATA ANALYSIS; ELECTRONIC EQUIPMENT; ENERGY LOSSES; HEAVY ION FUSION REACTIONS; HEAVY ION REACTIONS; IONIZATION CHAMBERS; MEV RANGE 10-100; MULTIPARTICLE SPECTROMETERS; PARTICLE IDENTIFICATION; REACTION KINETICS; SI SEMICONDUCTOR DETECTORS; SYMMETRY
OSTI ID:
659986
Research Organizations:
Caen Univ., 14 (France)
Country of Origin:
France
Language:
French
Other Identifying Numbers:
Other: ON: DE98629825; TRN: FR9810031040378
Availability:
INIS; OSTI as DE98629825
Submitting Site:
FRN
Size:
187 p.
Announcement Date:
Aug 27, 1998

Citation Formats

Metivier, V. Mechanisms of reaction and energy dissipation in the nucleus-nucleus symmetric collisions at 25 to 74 MeV/u: contribution of exclusive measurements of the INDRA multidetector; Mecanismes de reaction et de dissipation de l`energie dans les collisions symetriques noyau-noyau de 25 a 74 MeV/u: apport des mesures exclusives du multidetecteur INDRA. France: N. p., 1995. Web.
Metivier, V. Mechanisms of reaction and energy dissipation in the nucleus-nucleus symmetric collisions at 25 to 74 MeV/u: contribution of exclusive measurements of the INDRA multidetector; Mecanismes de reaction et de dissipation de l`energie dans les collisions symetriques noyau-noyau de 25 a 74 MeV/u: apport des mesures exclusives du multidetecteur INDRA. France.
Metivier, V. 1995. "Mechanisms of reaction and energy dissipation in the nucleus-nucleus symmetric collisions at 25 to 74 MeV/u: contribution of exclusive measurements of the INDRA multidetector; Mecanismes de reaction et de dissipation de l`energie dans les collisions symetriques noyau-noyau de 25 a 74 MeV/u: apport des mesures exclusives du multidetecteur INDRA." France.
@misc{etde_659986,
title = {Mechanisms of reaction and energy dissipation in the nucleus-nucleus symmetric collisions at 25 to 74 MeV/u: contribution of exclusive measurements of the INDRA multidetector; Mecanismes de reaction et de dissipation de l`energie dans les collisions symetriques noyau-noyau de 25 a 74 MeV/u: apport des mesures exclusives du multidetecteur INDRA}
author = {Metivier, V}
abstractNote = {This work is about the first experimental results obtained with the INDRA multidetector. First, the characterization of reaction mechanisms is performed. For complete events, global description of the collision is performed and compared with theoretical calculations. Dissipative binary mechanisms represent the largest part of the cross section for violent collisions whatever the bombarding energy (from 25 to 74 MeV/u) for the studied systems (Ar + KCl and Xe + Sn). The two outgoing products decay takes place through light charged particle and fragment emission. The reconstruction of the two primary sources is achieved, allowing thus the study of the evolution of the energy dissipation. Excitation energies exceeding 10 MeV/u are reached. The decay of the primary outgoing partners can be understood in a statistical model approach and the role of collective modes like expansion energy seems to be negligible. The study of the angular distributions points out angular momentum effects, `proximity effect` and a dynamical ternary process corresponding to the emission of a light fragment in between the two heavier products. For the most violent collisions, events can also be interpreted in terms of the multifragmentation of a single source, at least for the Xe + Sn system at 50 MeV/u (80 m barn). For the lower incident energies, fusion residues associated to the largest dissipations are recognized, but the cross sections is small (35 m barn for the Ar + KCl system at 32 MeV/u). (author) 91 refs.}
place = {France}
year = {1995}
month = {Apr}
}