Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: A simple method to prepare deuterated targets for experiments relevant
  to nuclear astrophysics   In this work, a simple and efficient thin ($50- 350\mu g/cm^2$) deuterated
polyethylene target preparation method is described. The method of easy removal
of thin targets from casting surface without using any cryogenic freezing has
been described. The difference in thermal expansion properties is used to
separate films from glass slides. 3-$\alpha$ radioactive source is used to
measure the target thickness. The material property of the prepared targets is
verified by Attenuated total reflection (ATR) method.

11
The categories of this paper are: hep-lat
14
The categories of this paper are: math-ph
4
The categories of this paper are: cond-mat
6
The categories of this paper are: astro-ph
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
32
The categories of this paper are: atom-ph
31
The categories of this paper are: ao-sci
0
The categories of this paper are: hep-ph
16
The categories of this paper are: stat
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
34
The categories of this paper are: chem-ph