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Phys. Rev. C 66, 044603 (2002) [10 pages]

Caloric curve of 8GeV/cπ-, p̅ +197Au reactions

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A. Ruangma*, R. Laforest†, E. Martin, E. Ramakrishnan‡, D. J. Rowland†, M. Veselsky, E. M. Winchester, and S. J. Yennello
Cyclotron Institute, Texas A&M University, College Station, Texas 77840

L. Beaulieu§, W.-c. Hsi**, K. Kwiatkowski††, T. Lefort‡‡, and V. E. Viola
Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405

A. Botvina
GSI, D-64220 Darmstadt, Germany
Institute for Nuclear Research, 117312 Moscow, Russia

R. G. Korteling
Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6

L. Pienkowski
Heavy Ion Laboratory, Warsaw University, 02 097 Warsaw, Poland

H. Breuer
Department of Physics, University of Maryland, College Park, Maryland 20742

S. Gushue and L. P. Remsberg
Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973

B. Back
Physics Division, Argonne National Laboratory, Argonne, Illinois 60439

Received 3 October 2001; published 9 October 2002

The relationship between nuclear temperature and excitation energy of hot nuclei formed by 8GeV/c negative pion and antiproton beams incident on 197Au has been investigated with the ISiS 4π detector array at the BNL AGS accelerator. The double-isotope-ratio technique was used to calculate the temperature of the hot system. The two thermometers used, (p/d-3He/4He) and (d/t-3He/4He), are in agreement below E*/A∼8MeV when corrected for secondary decay. Caloric curves derived from successive segments of the H and He kinetic energy spectra show a systematic decrease in temperature as the kinetic energy bin decreases, consistent with “cooling curve” behavior. When extrapolated to the evaporative-peak region, these results provide good agreement with caloric curves measured for similar systems. The caloric curves from this experiment are also compared with the predictions from the SMM multifragmentation model.

© 2002 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.66.044603
DOI:
10.1103/PhysRevC.66.044603
PACS:
25.70.Pq, 21.65.+f, 25.40.-h, 25.80.Hp

*Electronic address: ruangma@comp.tamu.edu

†Present address: Mallinckrodt Institute of Radiology, St. Louis, MO 63110.

‡Also at Microcal Software, Inc., Northampton, MA 01060.

§Also at Department de Physique, Université Laval, Quebec, Canada G1K 7P4.

**Also at Rush Presbyterian St. Lukes Medical Center, Chicago, IL 60612.

††Also at Los Alamos National Laboratory, Los Alamos, NM 87545.

‡‡Also at LPC Caen, 6 Boulevard Marechal Juin, 14050 Caen cedex, France.

 
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