ar X iv : n uc l - ex / 9 70 70 05 v 1 2 2 Ju l 1 99 7 1 Barrier Distributions as a Tool to Investigate Fusion and Fission

ar X iv : n uc l - ex / 9 70 70 04 v 1 1 4 Ju l 1 99 7 Evidence of Double Phonon Excitations in 16 O + 208 Pb Reaction

The fusion cross-sections for 16 O + 208 Pb, measured to high precision, enable the extraction of the distribution of fusion barriers. This shows a structure markedly different from the single–barrier which might be expected for fusion of two doubly– closed shell nuclei. The results of exact coupled channel calculations performed to understand the observations are presented. These calculations ...

ar X iv : n uc l - th / 9 70 80 36 v 1 1 9 A ug 1 99 7 Quantum Tunneling in Nuclear Fusion

Recent theoretical advances in the study of heavy ion fusion reactions below the Coulomb barrier are reviewed. Particular emphasis is given to new ways of analyzing data, such as studying barrier distributions; new approaches to channel coupling, such as the path integral and Green function formalisms; and alternative methods to describe nuclear structure effects, such as those using the Intera...

X iv : n uc l - ex / 9 90 40 05 v 2 1 1 Ju n 19 99 ANL - 1999 Fission Hindrance in hot 216 Th : Evaporation Residue Measurements

The fusion evaporation-residue cross sections for 32 S+ 184 W have been mea-246, and 257 MeV using the ATLAS Fragment Mass Analyzer. The data are compared with Statistical Model calculations and it is found that a nuclear dissipation strength, which increases with the excitation energy is required to reproduce the excitation function. A comparison with previously published data shows that the d...

ar X iv : n uc l - ex / 9 90 70 03 v 1 6 J ul 1 99 9 Coupled - channels analysis of the 16 O + 208 Pb fusion barrier distribution

Analyses using simplified coupled-channels models have been unable to describe the shape of the previously measured fusion barrier distribution for the doubly magic O+Pb system. This problem was investigated by remeasuring the fission excitation function for O+Pb with improved accuracy and performing more exact coupled-channels calculations, avoiding the constant-coupling and first-order coupli...

ar X iv : q - a lg / 9 60 70 28 v 1 2 7 Ju l 1 99 6 Examples of Categorification