Elastic Scattering of ${}^{16, 18}O$ by ${}^{116, 120}{Sn}$ at Energies near the Coulomb Barrier

The elastic scattering of

{}^{16, 18}O

{}^{116, 120}{Sn}

has been studied at energies near the Coulomb barrier. Angular distributions were measured at

E_{c . m .} = 57.97

MeV and excitation curves at 75, 80, 85, and 90° from 45 to 68 MeV and from 54 to 67.5 MeV for

{}^{16, 18}O

scattered by

{}^{120}{Sn}

, respectively. A single angular distribution was taken at

E_{c . m .} = 48.53

MeV for the scattering of

{}^{16}O

{}^{120}{Sn}

. An optical-model analysis was used to parametrize the data, and evidence is presented for a change in radius between

{}^{116}{Sn}

and

{}^{120}{Sn}

, and for a change of diffuseness between

{}^{16}O

and

{}^{18}O

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Elastic Scattering ofO16,18bySn116,120at Energies near the Coulomb Barrier