Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inverse-kinematics proton scattering on $^{50}$Ca: Determining effective
  charges using complementary probes   We have performed measurements of the $0_\mathrm{g.s.}^+ \rightarrow 2_1^+$
excitations in the neutron-rich isotopes $^{48,50}$Ca via inelastic proton
scattering on a liquid hydrogen target, using the GRETINA $\gamma$-ray tracking
array. A comparison of the present results with those from previous
measurements of the lifetimes of the $2_1^+$ states provides us the ratio of
the neutron and proton matrix elements for the $0_\mathrm{g.s.}^+ \rightarrow
2_1^+$ transitions. These results allow the determination of the ratio of the
proton and neutron effective charges to be used in shell model calculations of
neutron-rich isotopes in the vicinity of $^{48}$Ca.

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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: chem-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: ao-sci
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The categories of this paper are: funct-an
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: cmp-lg
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The categories of this paper are: math
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The categories of this paper are: q-bio
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The categories of this paper are: gr-qc
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The categories of this paper are: supr-con
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The categories of this paper are: atom-ph
33
The categories of this paper are: plasm-ph