Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements and simulations of athermal phonon transmission from
  silicon absorbers to aluminium sensors   Phonon reflection and transmission at the interfaces plays a fundamental role
in cryogenic particle detectors, in which the optimization of the phonon signal
at the sensor (in case of phonon-mediated detectors) or the minimization of the
heat transmission (when the detection occurs in the sensor itself) is of
primary importance to improve sensitivity. Nevertheless, the mechanisms
governing the phonon physics at the interfaces are still not completely
understood. The two more successful models, the acoustic mismatch model (AMM)
and diffuse mismatch model (DMM) are not able to explain all the accumulated
experimental data and the measurement of the transmission coefficients between
the materials remains a challenge. Here, we use measurements of the athermal
phonon flux in aluminium Kinetic Inductance Detectors (KID) deposited on
silicon substrates following a particle interaction to validate a Monte Carlo
(MC) phonon simulation. We apply the Mattis-Bardeen theory to derive the phonon
pulse energy and timing from the KID signal and compare the results with the MC
for both AMM and DMM models, finding a remarkable good agreement for AMM, while
diffuse reflection is clearly disfavored. For an aluminum film of 60 nm and a
silicon substrate of 380~$\mu$m, we obtain transmission coefficients Si-Al in
the range [0.3-0.55] and Si-Teflon in the range [0.1-0.15].

13
The categories of this paper are: quant-ph
20
The categories of this paper are: acc-phys
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
21
The categories of this paper are: adap-org
16
The categories of this paper are: stat
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
29
The categories of this paper are: funct-an
11
The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: math-ph
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio