|
|||||
|
|
Constraints on the time scale of nuclear breakup from thermal hard-photon emission |
|
| Authors: | R. Ortega D. d'Enterria G. Martınez D. Baiborodin H. Delagrange J. Dıaz F. Fernández H. Löhner T. Matulewicz R. W. Ostendorf S. Schadmand Y. Schutz P. Tlusty R. Turrisi V. Wagner H. W. Wilschut N. Yahlali |
| Affiliation: | (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 |
| 本文献已被 SpringerLink 等数据库收录！ | |