qubit
Overclocked quantum bit
- Joined
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System Name | Quantumville™ |
---|---|
Processor | Intel Core i7-2700K @ 4GHz |
Motherboard | Asus P8Z68-V PRO/GEN3 |
Cooling | Noctua NH-D14 |
Memory | 16GB (2 x 8GB Corsair Vengeance Black DDR3 PC3-12800 C9 1600MHz) |
Video Card(s) | MSI RTX 2080 SUPER Gaming X Trio |
Storage | Samsung 850 Pro 256GB | WD Black 4TB | WD Blue 6TB |
Display(s) | ASUS ROG Strix XG27UQR (4K, 144Hz, G-SYNC compatible) | Asus MG28UQ (4K, 60Hz, FreeSync compatible) |
Case | Cooler Master HAF 922 |
Audio Device(s) | Creative Sound Blaster X-Fi Fatal1ty PCIe |
Power Supply | Corsair AX1600i |
Mouse | Microsoft Intellimouse Pro - Black Shadow |
Keyboard | Yes |
Software | Windows 10 Pro 64-bit |
ANTIPROTONS appear to ring the Earth, confined by the planet's magnetic field lines. The antimatter, which may persist for minutes or hours before annihilating with normal matter, could in theory be used to fuel ultra-efficient rockets of the future.
Charged particles called cosmic rays constantly rain in from space, creating a spray of new particles - including antiparticles - when they collide with particles in the atmosphere. Many of these become trapped inside the Van Allen radiation belts, two doughnut-shaped zones around the planet where charged particles spiral around the Earth's magnetic field lines.
Satellites had already discovered positrons - the antimatter partners of electrons - in the radiation belts. Now a spacecraft has detected antiprotons, which are nearly 2000 times as massive.
Heavier particles take wider paths when they spiral around the planet's magnetic lines, and weaker magnetic field lines also lead to wider spirals. So relatively heavy antiprotons travelling around the weak field lines in the outer radiation belt were expected to take loops so big they would quickly get pulled into the lower atmosphere, where they would annihilate with normal matter. The inner belt was thought to have fields strong enough to trap antiprotons, and indeed that is where they have been found.
Piergiorgio Picozza from the University of Rome Tor Vergata, Italy, and colleagues detected the antiprotons using PAMELA, a cosmic-ray detector attached to a Russian Earth-observation satellite. The spacecraft flies through the Earth's inner radiation belt over the south Atlantic.
Between July 2006 and December 2008, PAMELA detected 28 antiprotons trapped in spiralling orbits around the magnetic field lines sprouting from the Earth's south pole (Astrophysical Journal Letters, DOI: 10.1088/2041-8205/737/2/l29). PAMELA samples only a small part of the inner radiation belt, but antiprotons are probably trapped throughout it. "We are talking about of billions of particles," says team member Francesco Cafagna from the University of Bari in Italy.
"I find it very interesting to note that the Earth's magnetic field works a little bit like the magnetic traps that we are using in the lab," says Rolf Landua at the CERN particle physics laboratory near Geneva, Switzerland. There, researchers have been trying to trap antimatter for ever longer periods to compare its behaviour with that of normal matter.
Alessandro Bruno, another team member from Bari, says antimatter in the Earth's radiation belts might one day be useful for fuelling spacecraft. Future rockets could be powered by the reaction between matter and antimatter, a reaction that produces energy even more efficiently than nuclear fusion in the sun's core.
"This is the most abundant source of antiprotons near the Earth," says Bruno. "Who knows, one day a spacecraft could launch then refuel in the inner radiation belt before travelling further."
Millions or billions of times as many antiprotons probably ring the giant planets.
As these annihilate on contact with normal matter, I'm surprised that spacecraft and satellites flying through it don't get damaged or eventually destroyed.
New Scientist