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Phys. Rev. C 64, 064603 (2001) [12 pages]

Thermal excitation-energy deposition in 5–15 GeV/c hadron-induced reactions with 197Au. I. Reconstruction of thermal source properties

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

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

L. Pienkowski
Heavy Ion Laboratory, Warsaw University, 02-093 Warsaw, Poland

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

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

Received 19 December 2000; revised 1 June 2001; published 6 November 2001

The event-by-event reconstruction procedure and related uncertainties involved in the derivation of excitation energy and source-size distributions are investigated for GeV hadron-induced reactions. The analysis is performed for the 5.0–14.6GeV/c proton-, π- and antiproton-induced reactions on 197Au, measured with the Indiana silicon sphere charged-particle detector array at the Brookhaven AGS accelerator. The relative contributions of the three major components of the excitation-energy calorimetry: charged-particle kinetic-energy sums, neutrons, and Q values from reconstructed events, are found to be relatively constant for excitation energies above about 500 MeV. Effects on the results imposed by various assumptions necessary to account for experimental factors are examined and a corresponding deconvolution of the excitation-energy distribution is performed. The major uncertainties in the calorimetry are found to be (1) separation of nonequilibrium and thermal-like charged particles, and (2) the unmeasured neutron component. The self-consistency of the procedure is tested via comparisons with the SMM and SIMON codes for the disintegration of hot nuclei.

© 2001 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevC.64.064603
DOI:
10.1103/PhysRevC.64.064603
PACS:
25.70.Pq, 21.65.+f, 25.40.-h, 25.80.Hp

*Present address: Laboratoire de Physique Corpusculaire de Caen, F-14050 Caen Cedex, France.

†Present address: Département de Physique, Université Laval, Quebec, Canada G1R 2J6.

‡Present address: Los Alamos National Laboratory, Los Alamos, NM 87545.

§Present address: Rush Presbyterian, St. Luke Medical Center, Chicago, IL 60612.

**Present address: Barnes Hospital, Washington University, St. Louis, MO 63130.

††Present address: Microcal Software, Inc., One Roundhouse Plaza, Northampton, MA 01060.

‡‡Present address: Mallinckrodt Institute of Radiology, Washington University School of Medicine, St. Louis, MO 63110.

 
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