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#neutrino

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Stephen Sekula

Let’s take a look at the next installment from my visit to #SURF last week. After arriving at the Ross Campus, we walked from the end of the tram line to the first of the VERY large DUNE caverns. DUNE is the Deep Underground Neutrino Experiment and will consist of huge neutrino detectors comprised from 17,000 tons of liquid argon. 800,000 tons of rock has been excavated to make the caverns.

THEY. ARE. HUGE.

Each is over 100m long.

We walk down the main corridor that connects to the DUNE caverns.
ALT
A map of the SURF campuses provided by the SURF facility. We are walking in the area known as the Ross Campus near the LBNF DUNE caverns.
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One of the two DUNE caverns, photographed from an overlook on one end. The cavern is 1.5 American football fields in length.
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A schematic of a DUNE detector to be located at SURF.
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#DUNE#neutrino#underground
Stephen Sekula

I will share more information soon regarding the site visit to #SURF, a sister underground laboratory to #SNOLAB. I want to share now that the "Deep Talk" lecture I delivered last night at the SURF Visitor Centre was an incredible experience. I was especially excited to be able to personally interact with over a dozen audience members. This included an awesome small-group Q&A session after the formal event.

Watch the lecture online:

vimeo.com/event/4989986

vimeo.comDr. Stephen Sekula, Research Group Manager at SNOLAB, for this Deep Talks event on Supernova!Join us for Deep Talks! 168,000 years ago, very close to our home galaxy, a massive star exploded. On February 23, 1987, the first signs of this catastrophe reached…
#Neutrino#Astronomy
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Decades ago, astrophysicist Stephen Hawking theorized that the Big Bang could have flooded the universe with tiny black holes, but the theory was never proven.

A group of researchers thinks they've found proof — with the discovery of a "stupendously powerful neutrino" at the bottom of the sea. The new hypothesis, not yet peer-reviewed, is that the neutrino is the signature of an evaporating black hole.

livescience.com/space/black-ho

Live Science · Evidence for Stephen Hawking's unproven black hole theory may have just been found — at the bottom of the seaBy Paul Sutter
#science#astrodon#BigBang
*
MPI für Radioastronomie

Three weeks ago, the scientific journal Nature @nature reported the discovery of the most energetic #neutrino ever observed. Its energy is 16,000 times greater than the strongest particle collisions created by the Large Hadron Collider and corresponds to 30 times the energy needed to press a computer key.

The neutrino was discovered in an underwater observatory in the Mediterranean, one of three neutrino detectors in water - two in the Mediterranean and one at Lake Baikal. At the geographic South Pole, there is the #IceCube neutrino detector under the ice. Other detectors exist underground in China, Italy, and Japan.

All these #detectors are not located on the Earth's surface because the Earth itself acts like a #telescope for neutrinos. Neutrinos are extremely light, electrically neutral particles that interact very weakly with matter and pass through the Earth. When they collide with atomic nuclei, charged particles are produced that move faster than light in water or ice, emitting blue light that is captured.

Water and ice are ideal media for detecting neutrinos because they provide large volumes to detect these particles while shielding against cosmic radiation and other disturbances. IceCube even utilizes 1 cubic kilometer of ice.

Neutrinos are the second most abundant particles in the universe, after photons, but are difficult to study because they interact so little with matter. Interestingly, dark matter and dark energy, which make up 95% of the universe, also interact very weakly with normal matter, while the remaining 5% consists of elements like #hydrogen and #helium, of which only 0.5% is visible matter (such as #stars).

Keith Dawson

xkcd 3053 [ xkcd.com/3053/ ] clued me to the KM3NeT neutrino detector deep in the Mediterranean Sea [ km3net.org/km3net-detects-the- ] (the details of which are pretty mind-boggling).

The KM3NeT collaboration just published a paper on the highest-energy neutrino ever seen — the event in question occurred almost exactly two years ago. This single particle, with a mass something like a half-millionth that of an electron, slammed into the sea with enough energy to raise an apple about a foot (1/3 joule). A light punch on the arm.

The paper is in Nature: [ nature.com/articles/s41586-024]

What was actually detected was the Cherenkov radiation from a single high-energy muon, produced from the interaction of the originating neutrino with sea water.

xkcdKM3NeT
#Physics#Neutrino
Benjamin Carr, Ph.D. 👨🏻‍💻🧬

Seafloor detector picks up record #neutrino while under construction
For context, the most powerful particle accelerator on Earth, Large Hadron Collider, accelerates protons to an energy of 7 Tera-electronVolts. Neutrino that was detected had an energy of at least 60 Peta-electronVolts, possibly hitting 230 PeV.
Attempts to trace neutrino to a source make it clear that it originated outside our galaxy, although there are a number of candidate sources in distant Universe.
arstechnica.com/science/2025/0

Ars Technica · Seafloor detector picks up record neutrino while under constructionBy John Timmer
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