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Constraints on the time scale of nuclear breakup from thermal hard-photon emission |
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| Authors: | R Ortega D d'Enterria G Mart?nez D Baiborodin H Delagrange J D?az F Fernández H Löhner T Matulewicz R W Ostendorf S Schadmand Y Schutz P Tlusty R Turrisi V Wagner H W Wilschut N Yahlali |
| Institution: | (1) Grup de Fısica de les Radiacions, Universitat Autònoma de Barcelona, 08193 Catalonia, Spain;(2) Subatech (Ecole des Mines, CNRS-IN2P3, Université de Nantes), BP 20722, 44307 Nantes, France;(3) GANIL, Grand Accélérateur National d'Ions Lourds, IN2P3-CNRS, DSM-CEA, 14076 Caen Cedex 5, France;(4) Institute of Nuclear Physics, 20568 Rez, Czech Republic;(5) Institut de Fısica Corpuscular (CSIC, UV), 22085, 46071 València, Spain;(6) Kernfysisch Versneller Instituut, 9747 AA Groningen, The Netherlands;(7) Institut of Experimental Physics, Warsaw University, 00681 Warsaw, Poland;(8) Institut für Kernphysik, Forschungszentrum Jülich, D-52457 Jülich, Germany |
| Abstract: | Measured hard-photon multiplicities from second-chance nucleon-nucleon collisions are used in combination with a kinetic thermal model to estimate the breakup times of excited nuclear systems produced in nucleus-nucleus reactions at intermediate energies. The obtained nuclear breakup time for the 129Xe + natSn reaction at 50 A MeV is Δτ ≈ 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 is consistent with Δτ ≈ 100 fm/c, such relatively long thermal photon emission times do not seemingly support the interpretation of nuclear breakup as due to a fast spinodal process for the heavy nuclear systems studied. |
| Keywords: | 21 65 +f Nuclear matter 25 70 -z Low and intermediate energy heavy-ion reactions 13 75 Cs Nucleon-nucleon interactions (including antinucleons deuterons etc ) 64 70 Dv Solid-liquid transitions |
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