Onset of collective expansion in nucleus-nucleus collisions below 100 MeV/u

S. C. Jeong, D. Cussol, D. Durand, R. Laforest, J. Péter, J. C. Angélique, G. Auger, G. Bizard, R. Brou, A. Buta, C. Cabot, Y. Cassagnou, E. Crema, Y. El Masri, P. Eudes, Z. Y. He, A. Kerambrun, C. Lebrun, R. Legrain, J. P. PatryA. Péghaire, R. Régimbart, E. Rosato, F. Saint-Laurent, J. C. Steckmeyer, B. Tamain, E. Vient

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Abstract

In 36Ar + 27A1 reactions at bombarding energies E/A from 55 to 95 MeV, the mass and excitation energy of the quasi-projectile have been reconstructed at all impact parameters. Up to excitation energies E*/A of ∼ 5-6 MeV, the mean kinetic energies of Z = 1 to Z = 9 fragments are in agreement with values predicted by sequential statistical decay. Above, a collective expansion energy is needed that grows with E*/A, reaching 1 to 2.2 MeV/u, depending on the de-excitation process, at E*/A ∼ 10 MeV. It decreases with the fragment charge. The dominant role of excitation energy supports the scenario of thermal expansion.

Original languageEnglish
Pages (from-to)208-218
Number of pages11
JournalNuclear Physics A
Volume604
Issue number2
DOIs
StatePublished - Jul 8 1996
Externally publishedYes

Keywords

  • Deduced quasi-projectile mass, excitation energy, thermal expansion evidence
  • Measured fragment kinetic energy and charges with 4π-array
  • Nuclear reactions al(ar, x), e = 55-95 mev/nucleon

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