Abstract
A detailed comparative study of the sub-barrier fusion of the two near-by systems 36S+50Ti,51V was performed at the National Laboratories of Legnaro (INFN). Aim of the experiment was the investigation of possible effects of the non-zero spin of the ground state of the 51V nucleus on the sub-barrier excitation function, and in particular on the shape of the barrier distribution. The results sh w that the two measured excitation functions are very similar down to the level of 20 - 30 μb. The same is observed for the two barrier distributions. Coupled-channels calculations have been performed and are in good agreement with the experimental data. This result indicates that the low-lying levels in 51V can be interpreted in the weak-coupling scheme, that is, 51V(I) = 50Ti(2+)⊗ p(1 f7/2).
Highlights
Most of the existing near- and sub-barrier fusion studies have concerned systems where both projectile and target are even-even nuclei
By comparing the two systems, we investigated if the shape of the barrier distribution keeps a trace of those different barriers
Micro-channel plate time detectors (MCP) followed by a fast ionization chamber (Fast IC) [4] and by a silicon detector placed in the same gas (CH4) volume of the Fast IC
Summary
Most of the existing near- and sub-barrier fusion studies have concerned systems where both projectile and target are even-even nuclei. Every m-substate has to be treated separately, and the coupled-channels (CC) equations solved This may produce different fusion cross sections near the barrier and the shape of the barrier distribution should keep memory of the various barriers associated to the m-substates. Since the nuclei can be treated as spherical, possible effects of the finite spin of the ground state are isolated, without the onset of deformation. This allows to directly compare the two cases before performing detailed CC calculations. By comparing the two systems, we investigated if the shape of the barrier distribution keeps a trace of those different barriers
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