Observation of mean-spin barrier bump in sub-barrier fusion of Si28 with Sm154

GIL, S.; ABRIOLA, D.; DIGREGORIO, D.E.; DI TADA, M.; ELGUE, M.; ETCHEGOYEN, A.; ETCHEGOYEN, M.C.; FERNNDEZ NIELLO, J.; FERRERO, A.M.J.; MACCHIAVELLI, A.O.; PACHECO, A.J.; TESTONI, J.E.; SILVEIRA GOMES, P.; VANIN, V.R.; CHARLOP, A.; GARCA, A.; KAILAS, S.; LUKE, S.J.; RENSHAW, E.; VANDENBOSCH, R.

PHYSICAL REVIEW LETTERS

AMER PHYSICAL SOC

Año: 1990 vol. 65 p. 3100 - 3103

0031-9007

We have measured the fusion excitation function and -ray multiplicities M for the Si28+154Sm system. We have also measured M for the O16+166Er system that leads to the same compound nucleus, Os182, as a calibration of the connection between M and the first moment of the spin distribution, l. We find that the deduced l for Si28+154Sm agrees reasonably well with theoretical calculations, and in particular its energy dependence exhibits the barrier bump expected when a shape degree of freedom is strongly coupled to the relative motion. © 1990 The American Physical Society.