Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intermittent Switching between Potential Flow and Turbulence in
  Superfluid Helium at mK Temperatures   Superfluid flow around an oscillating microsphere is investigated at
temperatures down to 25 mK. Stable laminar flow below a critical velocity and
turbulence at large drives are found to be separated below 0.5 K by an
intermediate range of driving forces where the flow is unstable, intermittently
switching between laminar and turbulent phases. We have recorded time series of
this switching phenomenon and have made a statistical analysis of the switching
probability. The mean lifetime of the turbulent phases grows with increasing
drive and becomes infinite at a critical value. Stability of the laminar phases
above the critical velocity is limited by natural background radioactivity or
cosmic rays.

13
The categories of this paper are: quant-ph
15
The categories of this paper are: nucl-ex
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
7
The categories of this paper are: hep-th
24
The categories of this paper are: dg-ga
0
The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
34
The categories of this paper are: chem-ph
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
36
The categories of this paper are: cmp-lg
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
20
The categories of this paper are: acc-phys
35
The categories of this paper are: mtrl-th