Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of the $\eta-^7Be$ Interaction Near Threshold in $p-^6Li$ Fusion   We present a calculation for $\eta$ production in the $p-^6Li$ fusion near
threshold including the $\eta-^7Be$ final state interaction (FSI). We consider
the $^6Li$ and $^7Be$ nuclei as $\alpha-d$ and $\alpha-^3He$ clusters
respectively. The calculations are done for the lowest states of $^7Be$ with $J
= ({3\over2}^-, {1\over2}^-)$ resulting from the $L = $1 radial wave function.
The $\eta-^7Be$ interaction is incorporated through the $\eta-^7Be$ $T-$matrix,
constructed from the medium modified matrices for the $\eta-^3He$ and
$\eta-\alpha$ systems. These medium modified matrices are obtained by solving
few body equations, where the scattering in nuclear medium is taken into
account.

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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: alg-geom
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin
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The categories of this paper are: stat
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The categories of this paper are: solv-int
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The categories of this paper are: astro-ph
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The categories of this paper are: q-alg
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: cs
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The categories of this paper are: quant-ph