Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strongly Coupled Chameleons and the Neutronic Quantum Bouncer   We consider the potential detection of chameleons using bouncing ultracold
neutrons. We show that the presence of a chameleon field over a planar plate
would alter the energy levels of ultra cold neutrons in the terrestrial
gravitational field. When chameleons are strongly coupled to nuclear matter,
$\beta\gtrsim 10^8$, we find that the shift in energy levels would be
detectable with the forthcoming GRANIT experiment, where a sensitivity of order
one percent of a peV is expected. We also find that an extremely large coupling
$\beta\gtrsim 10^{11}$ would lead to new bound states at a distance of order 2
microns, which is already ruled out by previous Grenoble experiments. The
resulting bound, $\beta\lesssim 10^{11}$, is already three orders of magnitude
better than the upper bound, $\beta\lesssim 10^{14}$, from precision tests of
atomic spectra.

15
The categories of this paper are: nucl-ex
22
The categories of this paper are: chao-dyn
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The categories of this paper are: solv-int
19
The categories of this paper are: eess
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg
34
The categories of this paper are: chem-ph
37
The categories of this paper are: supr-con
17
The categories of this paper are: q-fin
2
The categories of this paper are: math
9
The categories of this paper are: nlin
20
The categories of this paper are: acc-phys
12
The categories of this paper are: nucl-th
11
The categories of this paper are: hep-lat