Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Optical transmittance measurements of sheet resistors for the $\rm
  {CF}_4$ scintillating light in a gaseous time-projection chamber   A gaseous time-projection chamber (TPC) with a reconstructable $z$ coordinate
for nuclear recoil tracks has been developed for dark-matter searches and
$\alpha$ particle imagings in a low radioactivity background. A TPC with a
sheet-resistor field cage shows a potential to detect charge and photons
produced by tracks if the sheet resistor has optical transmittance for visible
light, and determine a drift length from a time difference between these
signals. In this study, an optical transmittance of sheet resistors was
measured to be $24.5\pm0.1_{\rm stat}\pm0.6_{\rm syst}\%$ for the $\rm {CF}_4$
gas scintillating light using an $\alpha$-particle source. The number of
photoelectrons is observed to be $\rm\sim20~p.e.$ for 5.3~MeV$\alpha$ with the
existence of a sheet resistor in the $\rm CF_4$ gas. Then, it is discussed how
many photoelectrons to be observable by using multi-alkali-cathode phototubes
and SiPMs for near-infrared light in order to detect lower energy tracks.

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The categories of this paper are: hep-ph
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
18
The categories of this paper are: econ
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
2
The categories of this paper are: math
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
26
The categories of this paper are: bayes-an
35
The categories of this paper are: mtrl-th
12
The categories of this paper are: nucl-th