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arxiv: 1102.1528 · v1 · pith:I4UHIQ3Cnew · submitted 2011-02-08 · ⚛️ nucl-th

Connection between effective-range expansion and nuclear vertex constant or asymptotic normalization coefficient

classification ⚛️ nucl-th
keywords effective-rangealphaasymptoticcasecoefficientcollisionsconstantexpansion
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Explicit relations between the effective-range expansion and the nuclear vertex constant or asymptotic normalization coefficient (ANC) for the virtual decay $B\to A+a$ are derived for an arbitrary orbital momentum together with the corresponding location condition for the ($A+a$) bound-state energy. They are valid both for the charged case and for the neutral case. Combining these relations with the standard effective-range function up to order six makes it possible to reduce to two the number of free effective-range parameters if an ANC value is known from experiment. Values for the scattering length, effective range, and form parameter are determined in this way for the $^{16}$O+$p$, $\alpha+t$ and $\alpha+^3$He collisions in partial waves where a bound state exists by using available ANCs deduced from experiments. The resulting effective-range expansions for these collisions are valid up to energies larger 5 MeV.

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