Effects of diabaticity on fusion of heavy nuclei in the dinuclear model ...

4-1: Fusion barriers B Table TCSM
η
are compared with the experimental
surplus <strong>of</strong> energy ∆B exp above the Bass barrier.
B Reactions TCSM(MeV
) ∆B η exp (MeV)
Zr + 90 Zr→180 Hg 4 0.0
+0.5
90
−0.5
Zr+
96
Zr→192 Hg 6 4.2
+1.2
96
−1.2
90 + 100
Mo→190 Pb 5 5.1
+1.0
−1.0
Zr
96 + 100
Mo→196 Pb 7 9.5
+1.0
−1.0
Zr
Mo+
100
Mo→194 Po1 0
94
6.3
+1.0
−1.0 1
Mo+
100
Mo→200 100
7 Po 2.2
+0.5
−0.5 1
90 + 124
Sn→214 Th 11 20.3
+4.0
−4.0
Zr
Zr + 124
Sn→220 Th1 7 26.7
+5.0
96
−3.0
128 Sn+ 126 Sn → 254 Fm 22 -
132 Sn + 132 Sn → 264 Fm 30 -
4.2.2 Comparison <strong>of</strong> driving potentials calculated with different methods
Figs. 4-6 a) and 4-7 a) show the driving potential calculated with the TCSM-method, with the
phenomenological method and with the alternative microscopical method for the systems 180 Hg
and 246 Fm, which are produced in the reactions 90 Zr + 90 Zr and 76 Ge + 170 Er, respectively.
Here, the nuclei forming the DNS are considered as spherical and the driving potential calculated
with the alternative microscopical method is shown for a temperature T =1MeV. The driving
potentials are given as a function <strong>of</strong> the charge Z <strong>of</strong> the light nucleus <strong>of</strong> the DNS. We can
observe that the driving potential calculated with the TCSM-method is qualitatively similar to
the driving potentials calculated with the phenomenological and the alternative microscopical
methods.
The phenomenological driving potential, where the shell effects are taken into account only
through the asymptotic binding energies, reveals more structures [73] than the ones calculated
with the TCSM-method or with the alternative microscopical method. Experiments ([28]-[32])
confirm the assumption that during the collision, the individual properties <strong>of</strong> the colliding nuclei
are conserved and the shell effects play an essential role. For instance, there are local maxima
corresponding to the closed-shell nuclei [28] in the charge and mass distributions <strong>of</strong> the reaction
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