Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Scintillation efficiency of nuclear recoils in a CaF-2(Eu) crystal for
  dark matter search   The scintillation efficiency (quenching factor) of fluorine and calcium
nuclei recoiling in a CaF-2(Eu) crystal was measured in an energy region
relevant to dark matter searches. The recoiling nuclei were obtained via the
19-F(n,n') and 40-Ca(n,n') reactions, where the neutron beam was provided via
the d(d,n)3-He reaction. The quenching factor of F and Ca nuclei in the
CaF-2(Eu) crystal was found to be 11 ~ 20 %, and 9 ~ 23 % relative to the
electron equivalent energy for 53 ~ 192 keV and 25 ~ 91 keV recoil energies,
respectively, and the energy dependence was observed. The quenching factor we
measured here is a little larger than that of previous studies, which may
depend on the Eu doping concentration of the crystal.

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The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
8
The categories of this paper are: hep-ex
14
The categories of this paper are: math-ph
29
The categories of this paper are: funct-an
0
The categories of this paper are: hep-ph
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
7
The categories of this paper are: hep-th
30
The categories of this paper are: q-alg
2
The categories of this paper are: math