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Fragment kinetic energy spectra for reactions induced by 8.0 GeV/c$\rm{\pi^-}$ beams incident on a $\rm{^{197}}$Au target have been analyzed inorder to deduce the possible existence and influence of thermal expansion. Theaverage fragment kinetic energies are observed to increase systematically withfragment charge but are nearly independent of excitation energy. Comparison ofthe data with statistical multifragmentation models indicates the onset ofextra collective thermal expansion near an excitation energy of E*/A$\rm{\approx}$ 5 MeV. However, this effect is weak relative to the radialexpansion observed in heavy-ion-induced reactions, consistent with theinterpretation that the latter expansion may be driven primarily by dynamicaleffects such as compression/decompression.Comment: 12 pages including 4 postscript figure

physical review. c. nuclear physics/physical review. c, nuclear physics

Thermal expansion effects in the 8 GeV/<i>c</i><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mi>−</mml:mi></mml:mrow></mml:msup></mml:mrow><mml:mrow><mml:msup><mml:mrow><mml:mo>+</mml:mo></mml:mrow><mml:mrow><mml:mn>197</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">Au</mml:mi></mml:math>reaction

Thermal expansion effects in the 8 GeV/cπ−+197Aureaction