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Constraints on the time-scale of nuclear breakup from thermal hard-photon emission

R. Ortega·D. d'Enterria·G. Martinez·D. Baiborodin·H. Delagrange·J. Diaz·F. Fernandez·H. Loehner·T. Matulewicz·R. W. Ostendorf·S. Schadmand·Y. Schutz·P. Tlusty·R. Turrisi·V. Wagner·H. W. Wilschut·N. Yahlali
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Abstract

Measured hard photon multiplicities from second-chance nucleon-nucleon collisions are used in combination with a kinetic thermal model, to estimate the break-up times of excited nuclear systems produced in nucleus-nucleus reactions at intermediate energies. The obtained nuclear break-up time for the $^{129}${Xe} + $^{nat}${Sn} reaction at 50{\it A} MeV is $Δ$$τ$ $\approx$ 100 -- 300 fm/$c$ for all reaction centralities. The lifetime of the radiating sources produced in seven other different heavy-ion reactions studied by the TAPS experiment are consistent with $Δ$$τ$ $\approx$ 100 fm/$c$, such relatively long thermal photon emission times do not support the interpretation of nuclear breakup as due to a fast spinodal process for the heavy nuclear systems studied.

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R. Ortega, D. d'Enterria, G. Martinez, D. Baiborodin, H. Delagrange, J. Diaz, F. Fernandez, H. Loehner, T. Matulewicz, R. W. Ostendorf, S. Schadmand, Y. Schutz, P. Tlusty, R. Turrisi, V. Wagner, H. W. Wilschut, N. Yahlali. 2005-08-26. Constraints on the time-scale of nuclear breakup from thermal hard-photon emission. https://doi.org/10.1140/epja%2Fi2006-09-017-2

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