Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Using ion production to monitor the birth and death of a metastable
  helium Bose-Einstein condensate   We discuss observations of the ion flux from a cloud of trapped metastable
helium atoms. Both Bose-Einstein condensates and thermal clouds were
investigated. The ion flux is compared to time-of-flight observations of the
expanded cloud. We show data concerning BEC formation and decay, as well as
measurements of two- and three-body ionization rate constants. We also discuss
possible improvements and extensions of our results.

32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
10
The categories of this paper are: q-bio
35
The categories of this paper are: mtrl-th
17
The categories of this paper are: q-fin
6
The categories of this paper are: astro-ph
29
The categories of this paper are: funct-an
27
The categories of this paper are: comp-gas
26
The categories of this paper are: bayes-an
18
The categories of this paper are: econ
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
20
The categories of this paper are: acc-phys
1
The categories of this paper are: cs