Physics – Nuclear Physics – Nuclear Experiment
Scientific paper
2005-08-26
Eur.Phys.J.A28:161-171,2006
Physics
Nuclear Physics
Nuclear Experiment
11 pages, 9 figures, submitted to EPJA
Scientific paper
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 $\Delta$$\tau$ $\approx$ 100 -- 300 fm/$c$ for all reaction centralities. The lifetime of the radiating sources produced in seven other different heavy-ion reactions studied by the TAPS experiment are consistent with $\Delta$$\tau$ $\approx$ 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.
Baiborodin D.
d'Enterria David
Delagrange H.
Diaz Jaqueline
Fernandez Francisco
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