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The European Physical Journal A
ISSN: 1434-6001 (printed version)
ISSN: 1434-601X (electronic version)
Abstract Volume 2 Issue 2 (1998) pp 193-198
heavy ion physics: Production of medium-weight isotopes by fragmentation in 750 A MeV 238U on 208Pb collisions
J. Benlliure (1), P. Armbruster (1), M. Bernas (2), C. Böckstiegel (3), S. Czajkowski (4), C. Donzaud (2), H. Geissel (1), A. Heinz (1), C. Kozhuharov (1), P. Dessagne (5), G. Münzenberg (1), M. Pfützner (1), C. Stéphan (2), K.-H. Schmidt (1), K. Sümmerer (1), W. Schwab (1), L. Tassan-Got (2), B. Voss (1)
(1) Gesellschaft für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany
(2) IPN Orsay, BP 1, F-91406 Orsay Cedex, France
(3) Institut für Kernphysik, TU Darmstadt, Schloßgartenstr. 9, D-64289 Darmstadt, Germany
(4) Centre d'Etudes Nucléaires de Bordeaux-Gradignan, F-33175, Gradignan Cedex, France
(5) Centre de Recherche Nucléaire, Strasbourg, IN2P3, France
Received: 3 October 1997 / Revised version: 27 February 1998
Abstract: Projectile fragmentation of 238U in a lead target was investigated at a bombarding energy of 750 A MeV. Isotopic production cross sections of about 250 different projectile fragments in the element range Z = 30-53 were measured with the FRagment Separator (FRS). The magnetic selection and the kinematical analysis of the measured isotopes allowed to disentangle fission and fragmentation residues. The mass loss of these residues indicates a violent collision where a large amount of energy is dissipated. The position of the fragmentation corridor defined by the measured residues was used to determine an effective proton-evaporation barrier.
PACS: 25.75.-q - 25.70.Mn - 21.10.Ft - 21.10.Gv - 27.50.+e - 27.50.+j - 24.10.Pa
Communicated by V. Metag
Article in PDF-Format (317 KB)
Online publication: June 16, 1998
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