Breakup time scale studied in the 8 GeV/cπ−+Au reaction

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

doi:10.1063/1.1470016

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Research Article| April 02 2002

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

L. Pienkowski;

L. Pienkowski

1Heavy Ion Laboratory, Warsaw University, ul. Pasteura 5a, 02-093 Warszawa, Poland

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K. Kwiatkowski;

K. Kwiatkowski

2Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405

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T. Lefort;

T. Lefort

2Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405

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W.-c. Hsi;

W.-c. Hsi

2Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405

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L. Beaulieu;

L. Beaulieu

2Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405

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V. E. Viola;

V. E. Viola

2Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405

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A. Botvina;

A. Botvina

3Institute for Nuclear Research, Russian Academy of Science, 117312 Moscow, Russia

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B. Back;

B. Back

4Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

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H. Breuer;

H. Breuer

5Department of Physics, University of Maryland, College Park, Maryland 20740

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S. Gushue;

S. Gushue

6Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973

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R. G. Korteling;

R. G. Korteling

7Department of Chemistry, Simon Fraser University, Burnaby, BC V5A IS6, Canada

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R. Laforest;

R. Laforest

8Department of Chemistry & Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843

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E. Martin;

E. Martin

8Department of Chemistry & Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843

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E. Ramakrishnan;

E. Ramakrishnan

8Department of Chemistry & Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843

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L. P. Remsberg;

L. P. Remsberg

6Chemistry Department, Brookhaven National Laboratory, Upton, New York 11973

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D. Rowland;

D. Rowland

8Department of Chemistry & Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843

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A. Ruangma;

A. Ruangma

8Department of Chemistry & Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843

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E. Winchester;

E. Winchester

8Department of Chemistry & Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843

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S. J. Yennello

8Department of Chemistry & Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843

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AIP Conf. Proc. 610, 688–692 (2002)

https://doi.org/10.1063/1.1470016

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 spectra supported by a momentum tensor analysis suggest that at large excitation energy, above 3–5 MeV/nucleon, highly excited heavy fragments are separated promptly after the thermalization. A binary fission-like mechanism seems unable to reproduce the data at excitation energies above 3–5 MeV/nucleon.

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2002

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