Breakup time scale studied in the 8 <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mi mathvariant="normal">GeV</mi><mo>/</mo><mi>c</mi><mrow><msup><mrow><mi>π</mi></mrow><mrow><mi>−</mi></mrow></msup></mrow><mrow><msup><mrow><mo>+</mo></mrow><mrow><mn>197</mn></mrow></msup></mrow><mi mathvariant="normal">Au</mi></math></span> reaction

L. Pienkowski; K. Kwiatkowski; T. Lefort; W.-c. Hsi; L. Beaulieu; V. E. Viola; A. Botvina; R. G. Korteling; R. Laforest; E. Martin; E. Ramakrishnan; D. Rowland; A. Ruangma; E. Winchester; S. J. Yennello; B. Back; H. Breuer; S. Gushue; L. P. Remsberg

doi:10.1103/PhysRevC.65.064606

Breakup time scale studied in the 8 $GeV / c π^{-} +^{197} Au$ reaction

L. Pienkowski, K. Kwiatkowski, T. Lefort, W.-c. Hsi, L. Beaulieu, V. E. Viola, A. Botvina, R. G. Korteling, R. Laforest, E. Martin, E. Ramakrishnan, D. Rowland, A. Ruangma, E. Winchester, S. J. Yennello, B. Back, H. Breuer, S. Gushue, and L. P. Remsberg

Phys. Rev. C 65, 064606 – Published 23 May 2002

Abstract

Experimental data from the reaction of an $8.0 GeV / c$ $π^{-}$ beam incident on a $^{197} Au$ target have been analyzed in order to investigate the breakup time scale for hot residues. Helium nuclei angular distributions and energy spectra supported by a momentum tensor analysis suggest that at large excitation energy, above $3 - 5 M e V / n u c l e o n,$ highly excited heavy fragments are separated promptly after the thermalization. A binary fission-like mechanism fits the experimental data at low excitation energies, but seems unable to reproduce the data at excitation energies above $3 - 5 M e V / n u c l e o n .$

Received 4 December 2001

DOI:https://doi.org/10.1103/PhysRevC.65.064606

Authors & Affiliations

L. Pienkowski^*

Heavy Ion Laboratory, Warsaw University, PL-02-093 Warszawa, Poland

K. Kwiatkowski^†, T. Lefort^‡, W.-c. Hsi^§, L. Beaulieu^∥, and V. E. Viola

Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405

A. Botvina

Institute for Nuclear Research, Russian Academy of Science, RU-117312 Moscow, Russia

R. G. Korteling

Department of Chemistry, Simon Fraser University, Burnaby, British Colombia, Canada V5A IS6

R. Laforest^¶, E. Martin, E. Ramakrishnan, D. Rowland^¶, A. Ruangma, E. Winchester, and S. J. Yennello

Department of Chemistry and Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843

B. Back

Physics Division, Argonne National Laboratory, Argonne, Illionis 60439

H. Breuer

Department of Physics, University of Maryland, College Park, Maryland 20740

S. Gushue and L. P. Remsberg

Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973

^*Electronic address: pienkows@slcj.uw.edu.pl
^†Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.
^‡Present address: Laboratoire de Physique Corpusculaire de Caen, F-14050 Caen Cedex, France.
^§Present address: Rush Presbyterian St. Luke Medical Center, Chicago, IL 60612.
^∥Present address: Département de Physique, Génie Physique et Optique Université Laval Québec, Canada G1K 7P4.
^¶Present address: Mallinckrodt Institute of Radiology, St. Louis, MO 63110.

References (Subscription Required)

Click to Expand

Issue

Vol. 65, Iss. 6 — June 2002

Reuse & Permissions

Access Options

Author publication services for translation and copyediting assistance advertisement

Physical Review C

covering nuclear physics