Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fragmentation of spin-dipole strength in $^{90}$Zr and $^{208}$Pb   An extension of time-dependent covariant density functional theory that
includes particle-vibration coupling is applied to the charge-exchange channel.
Spin-dipole excitation spectra are calculated an compared to available data for
$^{90}$Zr and $^{208}$Pb. A significant fragmentation is found for all three
angular-momentum components of the spin-dipole strength as a result of
particle-vibration coupling, as well as a shift of a portion of the strength to
higher energy. A high-energy tail is formed in the strength distribution that
linearly decreases with energy. Using a model-independent sum rule,the
corresponding neutron skin thickness is estimated and shown to be consistent
with values obtained at the mean-field level.

17
The categories of this paper are: q-fin
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
5
The categories of this paper are: gr-qc
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th