Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of total and partial charge-changing cross sections for
  200-400 MeV/nucleon 12C in water and polycarbonate   We have studied charged nuclear fragments produced by 200 - 400 MeV/nucleon
carbon ions, interacting with water and polycarbonate, using a newly developed
emulsion detector. Total and partial charge-changing cross sections for the
production of B, Be, and Li fragments were measured and compared with both
previously published measurements, and model predictions. This study is of
importance for validating and improving carbon ion therapy treatment planning
systems, and for estimating the radiological risks for personnel on space
missions, since carbon is a significant component of the Galactic Cosmic Rays.

25
The categories of this paper are: patt-sol
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
36
The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
4
The categories of this paper are: cond-mat
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph