Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Proposed parameter-free model for interpreting the measured positron
  annihilation spectra of materials using a generalized gradient approximation   Positron annihilation spectroscopy is often used to analyze the local
electronic structure of materials of technological interest. Reliable
theoretical tools are crucial to interpret the measured spectra. Here, we
propose a parameter-free gradient correction scheme for a local-density
approximation obtained from high quality quantum Monte Carlo data. The results
of our calculations compare favorably with positron affinity and lifetime
measurements opening new avenues for highly precise and advanced positron
characterization of materials.

15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
5
The categories of this paper are: gr-qc
1
The categories of this paper are: cs
20
The categories of this paper are: acc-phys
13
The categories of this paper are: quant-ph
19
The categories of this paper are: eess
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
0
The categories of this paper are: hep-ph