397 research outputs found
Coupled-channels analyses for large-angle quasi-elastic scattering in massive systems
We discuss in detail the coupled-channels approach for the large-angle
quasi-elastic scattering in massive systems, where many degrees of freedom may
be involved in the reaction. We especially investigate the effects of single,
double and triple phonon excitations on the quasi-elastic scattering for
Ti,Cr,Fe,Ni and ZnPb systems, for
which the experimental cross sections have been measured recently. We show that
the present coupled-channels calculations well account for the overall width of
the experimental barrier distribution for these systems. In particular, it is
shown that the calculations taking into account single quadrupole phonon
excitations in Ti and triple octupole phonon excitations in Pb
reasonably well reproduce the experimental quasi-elastic cross section and
barrier distribution for the TiPb reaction. On the other hand,
Cr,Fe,Ni and ZnPb systems seem to require
the double quadrupole phonon excitations in the projectiles in order to
reproduce the experimental data.Comment: 11 pages, 6 figure
Alpha-nucleus potential for alpha-decay and sub-barrier fusion
The set of parameters for alpha-nucleus potential is derived by using the
data for both the alpha-decay half-lives and the fusion cross-sections around
the barrier for reactions alpha+40Ca, alpha+59Co, alpha+208Pb. The alpha-decay
half-lives are obtained in the framework of a cluster model using the WKB
approximation. The evaluated alpha-decay half-lives and the fusion
cross-sections agreed well with the data. Fusion reactions between
alpha-particle and heavy nuclei can be used for both the formation of very
heavy nuclei and spectroscopic studies of the formed compound nuclei.Comment: 10 pages, 5 figure
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