Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Sum rule approach to a soft dipole mode in $\Lambda$ hypernuclei   Applying the sum rule approach, we investigate the energy of a soft dipole
motion in $\Lambda$ hypernuclei, which results from a dipole oscillation of a
$\Lambda$ hyperon against the core nucleus. To this end, we systematically
study single-$\Lambda$ hypernuclei, from $^{16}_{\;\,\Lambda}$O to
$^{208}_{\;\;\;\Lambda}$Pb, for which the ground state wave function is
obtained in the framework of Hartree-Fock method with several Skyrme-type
$\Lambda N$ interactions. Our results indicate that the excitation energy of
the soft dipole $\Lambda$ mode, $E_{sd\Lambda}$, decreases as the mass number
increases. We find that the excitation energy is well parametrized as
$E_{sd\Lambda}=26.6A^{-1/3}+11.2A^{-2/3}$ MeV as a function of mass number $A$.

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The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
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The categories of this paper are: econ
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys