Heating <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><mmultiscripts><mrow><mi>A</mi></mrow><mprescripts></mprescripts><mrow></mrow><mrow><mn>197</mn></mrow><mrow></mrow><mrow></mrow></mmultiscripts></mrow><mi>u</mi></math> Nuclei with <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mn>8</mn><mi></mi><mi>GeV</mi><mi>/</mi><mi mathvariant="italic">c</mi></math> Antiproton and <math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msup><mrow><mi mathvariant="italic">π</mi></mrow><mrow><mo>−</mo></mrow></msup></mrow></math> Beams

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

doi:10.1103/PhysRevLett.83.4033

Heating ${}^{197}A u$ Nuclei with $8 GeV / c$ Antiproton and $π^{-}$ Beams

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

Phys. Rev. Lett. 83, 4033 – Published 15 November 1999

Abstract

Comparison of the heating effect produced by 8 $GeV / c$ $π^{-}$ and antiproton beams incident on $^{197} Au$ nuclei has been conducted with the Indiana silicon sphere $4 π$ detector array. Event reconstruction indicates formation of thermal-like heavy residues with excitation energies up to 1.7 GeV. Enhanced energy deposition is observed for antiprotons relative to negative pions. For events with excitation energies that exceed 1000 MeV, there is a $50 %$ increase in cross section for the antiproton beam relative to the $π^{-}$ beam. The predominant decay mode at these high excitation energies is multifragmentation in which three or more $Z \geq 3$ fragments are emitted.

Received 3 March 1999

DOI:https://doi.org/10.1103/PhysRevLett.83.4033

Authors & Affiliations

T. Lefort¹, K. Kwiatkowski^1,*, W.-c. Hsi¹, L. Pienkowski², L. Beaulieu¹, B. Back³, H. Breuer⁴, S. Gushue⁵, R. G. Korteling⁶, R. Laforest⁷, E. Martin⁷, E. Ramakrishnan⁷, L. P. Remsberg⁵, D. Rowland⁷, A. Ruangma⁷, V. E. Viola¹, E. Winchester⁷, and S. J. Yennello⁷

¹Department of Chemistry and IUCF, Indiana University, Bloomington, Indiana 47405
²Heavy Ion Laboratory, Warsaw University, 02 097 Warsaw, Poland
³Physics Division, Argonne National Laboratory, 9700 S. Cass Avenue, Argonne, Illinois 60439
⁴Department of Physics, University of Maryland, College Park, Maryland 20742
⁵Department of Chemistry, Brookhaven National Laboratory, Upton, New York 11973
⁶Department of Chemistry, Simon Fraser University, Burnaby, British Columbia, Canada V5A 1S6
⁷Department of Chemistry and Cyclotron Laboratory, Texas A&M University, College Station, Texas 77843