FERMI Team Begins Search for Elusive Dark Matter Particles
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May 02, 2013

FERMI Team Begins Search for Elusive Dark Matter Particles

 

           Dark_matter_2

 

Scientists this week heard their first pops in an experiment that searches for signs of dark matter in the form of tiny bubbles. Dark-matter particles, which scientists think rarely interact with other matter, should form individual bubbles in the Fermi COUPP-60 tank.

“The events are so rare, we’re looking for a couple of events per year,” said Hugh Lippincott, a postdoc with the Department of Energy’s Fermi National Accelerator Laboratory who has spent much of the past several months leading the installation of the one-of-a-kind detector in a laboratory a mile and a half underground. “Our goal is to make the most sensitive detector to see signals of particles that we don’t understand." 


The COUPP-60 detector is a jar filled with purified water and CF3I—an ingredient found in fire extinguishers. The liquid in the detector is kept at a temperature and pressure slightly above the boiling point, but itrequires an extra bit of energy to actually form a bubble. When a passing particle enters the detector and disturbs an atom in the clear liquid, it provides that energy.

Other, more common and interactive particles such as neutrons are more likely to leave a trail of multiple bubbles as they pass through.

Over the next few months, scientists will analyze the bubbles that form in their detector to test how well COUPP-60 is working and to determine whether they see signs of dark matter. One of the advantages of the detector is that it can be filled with a different liquid, if scientists decide they would like to alter their techniques.

The COUPP-60 detector is the latest addition to a suite of dark-matter experiments running in the SNOLAB underground science laboratory, located in Ontario, Canada. Scientists run dark-matter experiments underground to shield them from a distracting background of other particles that constantly shower Earth from space. Dark-matter particles can move through the mile and a half of rock under which the laboratory is buried, whereas most other particles cannot.

Scientists further shield the COUPP-60 detector from neutrons and other particles by submersing it in 7,000 gallons of water.

Scientists first proposed the existence of dark matter in the 1930s, when they discovered that visible matter could not account for the rotational velocities of galaxies. Other evidence, such as gravitational lensing that distorts our view of faraway stars and our inability to explain how other galaxies hold together if not for the mass of dark matter, have improved scientists’ case. Astrophysicists think dark matter accounts for about a quarter of the matter and energy in the universe. But no one has conclusively observed dark-matter particles.

The COUPP experiment includes scientists, technicians and students from the University of Chicago, Indiana University South Bend, Northwestern University, University of Valencia, Virginia Tech, Fermi National Accelerator Laboratory, Pacific Northwest National Laboratory and SNOLAB.

Clues from the Chandra X-Ray Observatory (image at the top of the page) have enabled scientists to constrain the size of dark matter particles in galaxy clusters. Dark matter is the invisible and unknown material that constitutes about 80% of the matter in the Universe.

The Daily Galaxy via FermiLab

Image Credit: NASA/SAO/CXC

Comments

VISIBLE MATTER AND POINTS OF VIEWS . . .

Quote: "Scientists first proposed the existence of dark matter in the 1930s, when they discovered that visible matter could not account for the rotational velocities of galaxies".

AD: Visible matter CAN account for the rotational velocities in galaxies. OK, if you have a flat 2 D view of the movements in galaxies, it can´t. But if you have a electromagnetic 3D spherical and circuital (Double Torus Motion) view of galaxies, everything is fluent in a circuit and therefore there’s no “heavy local point of gravity” and therefore there´s no missing mass at all.

Quote: “Other evidence, such as gravitational lensing that distorts our view of faraway stars and our inability to explain how other galaxies hold together if not for the mass of dark matter, have improved scientists’ case”.

AD: Not at all. The “gravity lensing” is just refraction of light as we can observe in several phenomenon´s on Earth.

Links:
Double Torus Motion - http://www.youtube.com/watch?v=Lggn6rbqPA4

Light refraction - http://hyperphysics.phy-astr.gsu.edu/hbase/geoopt/refr.html

Until we guess rationally what dark matter constituents may well be and still not react with visible baryon matter at all, how can we possibly detect these particles using the baryon matter detection? The primordial matter is the source of both visible and dark matter. Dark matter preceded visible baryon matter and it still can not interact with the visible matter. It points to me that dark matter must be non-baryon in nature! It may well be the predecessors like quarks/gluons or even their heavier mass versions that no longer exist in our universe.


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