The Higgs boson with spin 0 is now proved, at least to most physicists.
It is the only spin 0 massive particle known to exist in nature, if it
is not a funding vehicle for CERN ;-)
A hypothetical particle of interest (wrt UDH) is known as the chameleon
particle. It has zero spin and other possible features which are
compatible with those of UDH.
The $64 question: Could UDH actually be the chameleon, and/or is it spin 0?
One way to both detect and modulate the virtual neutron, if it exists in
the form of UDH and has spin, would be by the Larmor frequency in a
magnetic field (NMR).
The Larmor frequency can be visualized as magnetic precession along a
force axis, analogous to a spinning top. Here is the range of
frequencies for related particles (you will not be able to see this
table in plain text):
1.7608 x 10^11
2.6753 x 10^8
0.4107 x 10^8
1.8326 x 10^8
The spin of UDH, considered as a neutron-like unit containing 3 quarks,
but not an elementary particle (or is it?) is an interesting subject but
there is very little authoritative guidance.
If UDH has effective QM spin of 0 then easy detection is going to be
difficult and its usefulness diminished.
In 1955, Italian Physicist Don Carlo Borghi synthesized neutrons in a
Klystron filled with hydrogen and irradiated with microwaves. Neutrons
were verified by the assorted radioactive isotopes following
activation, and their decay rates. The experiment was validated by
Missfeldt in 1978 in Germany. The experiment was further validated by
William Gray of Menlo Park CA circa 2000.
Mainsteam science generally overlooks these experiments... and
especially the validation by Santilli, who actually is selling a
commercial version as a neutron generator -- but possibly the high
level rejection is for the wrong reason. The experiments were very
likely making dense hydrogen, not neutrons. UDH or
ultra-dense-hydrogen has many of the same characteristics as the
neutron and can be called a "virtual neutron". The decay mode is even
Gray used a Cyclotron to energize protons to 0.78 MeV and an Electron
Gun to match their velocities, and got high yields. In its virtual
neutron state, the orbital electron travels at 2.74 x 10^8 m/s,
according to Gray - not light speed, because the proton and electron
radii limit the orbital size to 2.76 fm. Gray also fused the species
into helium. He calls this process Modulated Quantum Neutron Fusion.
Many of Gray's papers can be found at mqnf.com
Finnish theoretical physicist Matti Pitkanen discusses some of this here: