Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Parity Violating Measurements of Neutron Densities and Nuclear Structure   Parity violating electron nucleus scattering is a clean and powerful tool for
measuring the spatial distributions of neutrons in nuclei with unprecedented
accuracy. Parity violation arises from the interference of electromagnetic and
weak neutral amplitudes, and the $Z^0$ of the Standard Model couples primarily
to neutrons at low $Q^2$. Experiments are now feasible at existing facilities.
We show that theoretical corrections are either small or well understood, which
makes the interpretation clean. A neutron density measurement may have many
implications for nuclear structure, atomic parity nonconservation experiments,
and the structure of neutron stars.

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The categories of this paper are: dg-ga
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
1
The categories of this paper are: cs
2
The categories of this paper are: math
11
The categories of this paper are: hep-lat
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
16
The categories of this paper are: stat