Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of the scintillation and ionization response of liquid xenon
  at MeV energies in the EXO-200 experiment   Liquid xenon (LXe) is employed in a number of current and future detectors
for rare event searches. We use the EXO-200 experimental data to measure the
absolute scintillation and ionization yields generated by $\gamma$ interactions
from $^{228}$Th (2615~keV), $^{226}$Ra (1764~keV) and $^{60}$Co (1332~keV and
1173~keV) calibration sources, over a range of electric fields. The $W$-value
that defines the recombination-independent energy scale is measured to be
$11.5~\pm~0.5$~(syst.)~$\pm~0.1$~(stat.) eV. These data are also used to
measure the recombination fluctuations in the number of electrons and photons
produced by the calibration sources at the MeV-scale, which deviate from
extrapolations of lower-energy data. Additionally, a semi-empirical model for
the energy resolution of the detector is developed, which is used to constrain
the recombination efficiency, i.e., the fraction of recombined electrons that
result in the emission of a detectable photon. Detailed measurements of the
absolute charge and light yields for MeV-scale electron recoils are important
for predicting the performance of future neutrinoless double beta decay
detectors.

10
The categories of this paper are: q-bio
5
The categories of this paper are: gr-qc
28
The categories of this paper are: alg-geom
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
25
The categories of this paper are: patt-sol
33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
11
The categories of this paper are: hep-lat
21
The categories of this paper are: adap-org
0
The categories of this paper are: hep-ph
14
The categories of this paper are: math-ph