How unique is the asymptotic normalization coefficient method?

The asymptotic normalization coefficients (ANC's) for the vertex ${}^{10}{\stackrel{\ensuremath{\rightarrow}}{\mathrm{B}}}^{9}\mathrm{Be}+p$ are deduced from a set of different proton transfer reactions at different energies. This set should ensure the peripheral character of the reaction and availability of the data for the elastic channels. The problems associated with the characteristics of the data and the analysis are discussed. For a subgroup of the set of available data, the uniqueness property of the extracted ANC's is fulfilled. However, more measurements are needed before a definite conclusion can be drawn.

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