Elastic Scattering ofC12,N14, andO16byPb208and ofO16byBi209

Differential cross sections have been measured for elastic scattering of

{}^{12}C

{}^{14}N

, and

{}^{16}O

{}^{208}{Pb}

and of

{}^{16}O

{}^{209}{Bi}

. A phase-shift analysis of the data was made to evaluate the nuclear interaction radius

R

and the "surface thickness" for the interaction

Δ R

. The interaction-radius parameter

r_{0}

was found to be 1.44±0.03 F for all four scattering experiments, where

R = r_{0} ({A_{1}}^{\frac{1}{3}} + {A_{2}}^{\frac{1}{3}})

, the

A_{i}

being the nuclear masses of the two nuclei involved in the scattering process. In contrast to the constant value found for

r_{0}

, the "surface thickness" was found to be 0.31±0.02 F for the

{}^{14}N

scattering, 0.42±0.04 F for the

{}^{16}O

scattering on both

{}^{208}{Pb}

and

{}^{209}{Bi}

, and 0.49±0.05 F for the

{}^{12}C

scattering. It is not clear why these "surface thicknesses" differ as they do.

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