Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Unusual Phase Behavior of Confined Heavy Water   Many of the anomalous properties of water are amplified in the deeply
supercooled region. Here we present neutron scattering measurements of the
density of heavy water confined in a nanoporous silica matrix MCM-41-S
(\approx15 {\AA} pore diameter), namely, the equation of state {\rho}(T,P), in
a temperature-pressure range, from 300 K to 130 K and from 1 bar to 2900 bar,
where bulk water will crystalize. A sudden change of slope in the otherwise
continuous density profile (a "kink") is observed below a certain pressure Pc;
however, this feature is absent above Pc. Instead, a hysteresis phenomenon in
the density profiles between the warming and cooling scans becomes prominent
above Pc. Hence, the data can be interpreted as a line of apparent 2nd-order
phase transition at low pressures evolving into a line of 1st-order phase
transition at high pressures. If so, the existence of a "tricritical point" at
Pc \approx 1500 bar, Tc \approx 210 K becomes another possible scenario to
explain the exceptionally rich phase behavior of low-temperature confined
water.

30
The categories of this paper are: q-alg
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
0
The categories of this paper are: hep-ph
22
The categories of this paper are: chao-dyn
6
The categories of this paper are: astro-ph
16
The categories of this paper are: stat
15
The categories of this paper are: nucl-ex
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
1
The categories of this paper are: cs
27
The categories of this paper are: comp-gas
24
The categories of this paper are: dg-ga
3
The categories of this paper are: physics
19
The categories of this paper are: eess