S -factor and scattering-parameter extractions from ${}^{3}\mathrm{He}+{}^{4}\mathrm{He}{ \rightarrow }^{7}\mathrm{Be}+\gamma $
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We prove a number of results having to do with equipping type-I\mathrm{C}^*-algebras with compact quantum group structures, the two main ones being that such a compact quantum group is necessarily co-amenable, and that if the\mathrm{C}^*-algebra in question is an extension of a non-zero finite direct sum of elementary\mathrm{C}^*-algebras by a commutative unital\mathrm{C}^*-algebra then it must be finite-dimensional.more » « less
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