Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Precision Mass Measurements of Neutron-Rich Co Isotopes Beyond N=40   The region near Z=28, N=40 is a subject of great interest for nuclear
structure studies due to spectroscopic signatures in $^{68}$Ni suggesting a
subshell closure at N=40. Trends in nuclear masses and their derivatives
provide a complementary approach to shell structure investigations via
separation energies. Penning trap mass spectrometry has provided precise
measurements for a number of nuclei in this region, however a complete picture
of the mass surfaces has so far been limited by the large uncertainty remaining
for nuclei with N > 40 along the iron and cobalt chains. Here we present the
first Penning trap measurements of $^{68,69}$Co, performed at the Low-Energy
Beam and Ion Trap facility at the National Superconducting Cyclotron
Laboratory. In addition, we perform ab initio calculations of ground state and
two-neutron separation energies of cobalt isotopes with the valence-space
in-medium similarity renormalization group approach based on a particular set
of two- and three-nucleon forces which predict saturation in infinite matter.
We discuss the importance of these measurements and calculations for
understanding the evolution of nuclear structure near $^{68}$Ni.

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The categories of this paper are: q-alg
9
The categories of this paper are: nlin
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
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The categories of this paper are: stat
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
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The categories of this paper are: chao-dyn
2
The categories of this paper are: math
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The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph
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The categories of this paper are: math-ph
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The categories of this paper are: comp-gas
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The categories of this paper are: plasm-ph