Adiabatic quantum tunneling in heavy-ion sub-barrier fusion

Details Adiabatic quantum tunneling in heavy-ion sub-barrier fusion Adiabatic quantum tunneling in heavy-ion sub-barrier fusion

1997-02-10

arxiv.org/abs/nucl-th/9702024v2

Phys.Rev.Lett. 79 (1997) 2014-2017

Physics

Nuclear Physics

Nuclear Theory

8 pages, 3 figures, Submitted to Physical Review Letters

Scientific paper

10.1103/PhysRevLett.79.2014

High precision measurements of the fusion excitation functions for the reactions ^{40}Ca + ^{194}Pt, ^{192}Os clearly demonstrate that projectile excitation significantly modifies the potential barrier distribution. In sharp contrast, fusion of ^{16}O + ^{144}Sm appears to show no influence of the projectile excitation on the shape of the barrier distribution. These apparently conflicting conclusions are reconciled in this work, using realistic coupled--channels calculations, which show that high energy states produce an adiabatic potential renormalisation. This result indicates that adiabatic effects restrict, in a natural way, the states which influence the shape of a fusion barrier distribution. The analysis of barrier distributions thus offers a criterion for the relevance of the `counter term' prescription in the Caldeira-Leggett approach.

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