Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: New precision mass measurements of neutron-rich calcium and potassium
  isotopes and three-nucleon forces   We present precision Penning-trap mass measurements of neutron-rich calcium
and potassium isotopes in the vicinity of neutron number N=32. Using the TITAN
system the mass of $^{51}$K was measured for the first time, and the precision
of the $^{51,52}$Ca mass values were improved significantly. The new mass
values show a dramatic increase of the binding energy compared to those
reported in the atomic mass evaluation. In particular, $^{52}$Ca is more bound
by 1.74 MeV, and the behavior with neutron number deviates substantially from
the tabulated values. An increased binding was predicted recently based on
calculations that include three-nucleon (3N) forces. We present a comparison to
improved calculations, which agree remarkably with the evolution of masses with
neutron number, making neutron-rich calcium isotopes an exciting region to
probe 3N forces at neutron-rich extremes.

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The categories of this paper are: astro-ph
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int
9
The categories of this paper are: nlin
29
The categories of this paper are: funct-an
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
27
The categories of this paper are: comp-gas
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
26
The categories of this paper are: bayes-an
4
The categories of this paper are: cond-mat
8
The categories of this paper are: hep-ex
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph