Subbarrier fusion of 16O+147,149Sm

DIGREGORIO, D.E.; DITADA, M.; ABRIOLA, D.; ELGUE, M.; ETCHEGOYEN, A.; ETCHEGOYEN, M.C.; FERNANDEZ NIELLO, J.O.; FERRERO, A.M.J.; GIL, S.; MACCHIAVELLI, A.O.; PACHECO, A.J.; TESTONI, J.E.; GOMES, P. R. SILVEIRA; VANIN, V.R.; NETO, R. LIGUORI; CREMA, E.; STOKSTAD, R.G.

PHYS. REV. - C

AMER PHYSICAL SOC

Año: 1989 vol. 39 p. 516 - 523

0556-2813

Fusion cross sections have been measured for 16O+147,149Sm at bombarding energies in the range 61 MeV Elab(16O)75 MeV by off-line observation of x rays emitted in the radioactive decay of Yb isotopes and their daughters. The fusion excitation functions are similar to those of the adjacent even Sm isotopes. It appears, therefore, that the odd valence neutrons do not have any unusual influence on the subbarrier enhancement of fus in these systems. The x-n distributions of the evaporation residues were also determined. The nuclear deformation parameters 2 deduced for the odd and even Sm isotopes using Wongs model establish a smooth systematic behavior of 2 with target collectivity. Fusion cross sections for O16 with all the stable Sm isotopes are tabulated.