Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Ab initio effective interactions for sd-shell valence nucleons   We perform \textit{ab initio} no-core shell-model calculations for $A=18$ and
$19$ nuclei in a $4\hbar\Omega$, or $N_{\rm max}=4$, model space by using the
effective JISP16 and chiral N3LO nucleon-nucleon potentials and transform the
many-body effective Hamiltonians into the $0\hbar\Omega$ model space to
construct the $A$-body effective Hamiltonians in the $sd$-shell. We separate
the $A$-body effective Hamiltonians with $A=18$ and $A=19$ into inert core,
one-, and two-body components. Then, we use these core, one-, and two-body
components to perform standard shell-model calculations for the $A=18$ and
$A=19$ systems with valence nucleons restricted to the $sd$ shell. Finally, we
compare the standard shell-model results in the $0\hbar\Omega$ model space with
the exact no-core shell model results in the $4\hbar\Omega$ model space for the
$A=18$ and $A=19$ systems and find good agreement.

35
The categories of this paper are: mtrl-th
23
The categories of this paper are: solv-int
28
The categories of this paper are: alg-geom
18
The categories of this paper are: econ
2
The categories of this paper are: math
37
The categories of this paper are: supr-con
8
The categories of this paper are: hep-ex
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
29
The categories of this paper are: funct-an
15
The categories of this paper are: nucl-ex
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
21
The categories of this paper are: adap-org