Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Spin-flip doublets of $^9$Be spectrum within a cluster model   The structure of the $^9$Be low-lying spectrum is studied within the cluster
model $\alpha+\alpha+n$. In the model the total orbital momentum is fixed for
each energy level. Thus each level is determined as a member of the spin-flip
doublet corresponding to the total orbital momentum ($L^\pi=0^+, 2^+,4^+, 1^-,
2^-,3^-, 4^-$) of the system. The Ali-Bodmer potential (model E) is applied for
the $\alpha\alpha$ interaction. We employ a local $\alpha n$ potential which
was constructed to reproduce the $\alpha-n$ scattering data. The Pauli blocking
is simulated by the repulsive core of the $s$-wave components of these
potentials. Configuration space Faddeev equations are used to calculate the
energy of the bound state ($E_{cal.}$=-1.493 MeV v.s. $E_{exp.}$=-1.5735 MeV)
and resonances. A variant of the method of analytical continuation in the
coupling constant is applied to calculate the energies of low-lying levels.
Available $^9$Be spectral data are satisfactorily reproduced by the proposed
model.

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The categories of this paper are: quant-ph
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The categories of this paper are: hep-lat
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: math
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The categories of this paper are: math-ph
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The categories of this paper are: eess
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The categories of this paper are: nlin
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The categories of this paper are: solv-int
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: adap-org
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The categories of this paper are: comp-gas
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The categories of this paper are: dg-ga
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The categories of this paper are: cmp-lg
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The categories of this paper are: hep-ph