Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of material isotopics and atom number ratio with
  alpha-particle spectroscopy for the NIFFTE fission Time Projection Chamber
  actinide target   We present the results of a measurement of isotopic concentrations and atomic
number ratio of a double-sided actinide target with alpha-spectroscopy and mass
spectrometry. The double-sided actinide target, with primarily Pu-239 on one
side and U-235 on the other, was used in the fission Time Projection Chamber
(fissionTPC) for a measurement of the neutron-induced fission cross-section
ratio between the two isotopes. The measured atomic number ratio is intended to
provide an absolute normalization of the measured fission cross-section ratio.
The Pu-239/U-235 atom number ratio was measured with a combination of mass
spectrometry and alpha-spectroscopy with a planar silicon detector with
uncertainties of less than 1%.

37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
22
The categories of this paper are: chao-dyn
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
9
The categories of this paper are: nlin
5
The categories of this paper are: gr-qc
23
The categories of this paper are: solv-int
19
The categories of this paper are: eess
11
The categories of this paper are: hep-lat
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
14
The categories of this paper are: math-ph