TY - JOUR
T1 - Onset of collective expansion in nucleus-nucleus collisions below 100 MeV/u
AU - Jeong, S. C.
AU - Cussol, D.
AU - Durand, D.
AU - Laforest, R.
AU - Péter, J.
AU - Angélique, J. C.
AU - Auger, G.
AU - Bizard, G.
AU - Brou, R.
AU - Buta, A.
AU - Cabot, C.
AU - Cassagnou, Y.
AU - Crema, E.
AU - El Masri, Y.
AU - Eudes, P.
AU - He, Z. Y.
AU - Kerambrun, A.
AU - Lebrun, C.
AU - Legrain, R.
AU - Patry, J. P.
AU - Péghaire, A.
AU - Régimbart, R.
AU - Rosato, E.
AU - Saint-Laurent, F.
AU - Steckmeyer, J. C.
AU - Tamain, B.
AU - Vient, E.
PY - 1996/7/8
Y1 - 1996/7/8
N2 - 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.
AB - 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.
KW - Deduced quasi-projectile mass, excitation energy, thermal expansion evidence
KW - Measured fragment kinetic energy and charges with 4π-array
KW - Nuclear reactions al(ar, x), e = 55-95 mev/nucleon
UR - http://www.scopus.com/inward/record.url?scp=16144366542&partnerID=8YFLogxK
U2 - 10.1016/0375-9474(96)00115-7
DO - 10.1016/0375-9474(96)00115-7
M3 - Article
AN - SCOPUS:16144366542
VL - 604
SP - 208
EP - 218
JO - Nuclear Physics, Section A
JF - Nuclear Physics, Section A
SN - 0375-9474
IS - 2
ER -