Positrons

正电子

常用释义

词性释义

正电子
例句
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But the lightning flash detected by Fermi appeared to have produced about 100 trillion positrons: "That's a lot, " he said.
To make cold antihydrogen, the experimenters must slow down the antiprotons to a temperature similar to that of the positrons.
If the material being tested has no defects in it, the positrons react a little differently.
In the case of a material with a defect, the positrons are trapped at nano-sized defects in the material.
Some antiproton annihilations produce a shower of positrons, which in turn produce 511-keV gamma rays, two of which may be detected.
The antiprotons are then pushed into the same trap as the positrons and left to mingle for a second or so.
For the positrons, one can think of the end potential as a ramp and the particle as a ball rolling up the ramp.
These positrons then come into contact with electrons in the body, and the two annihilate, releasing two gamma-ray photons.
It has developed better techniques for cooling both positrons and antiprotons, which should allow it to trap more anti-atoms.
A chain of reactions, starting with a beam of laser-excited cesium atoms, transfers the positrons to the antiprotons to form antihydrogen.
Coaxing hot and bothered antiprotons and positrons to couple is quite a task.
But discovering the creation of positrons "gives us a very, very important clue as to what's happening. "
This is because radioactive nuclear elements are formed in the giant outbursts of energy, and some of these decay by releasing positrons.
Positrons moving slowly enough are brought to a halt and turned around on the ramp, keeping them inside the trap.
Another hint dates to the early 1970s, when astronomers detected vast numbers of electrons annihilating with positrons.
The traps hold the positrons very securely: after an hour, an insignificant number of them are lost.
It shows that the stacking faults in the alloy have not a remarkable effect of trapping positrons .
Linear acceleration of electrons and positrons is what plasma-based accelerators are most suited for.
The process would also create large numbers of electrons and positrons at the core of the Milky Way.
Some astronomers have suggested that exploding stars could produce the positrons.
During a PET scan, the patient is injected with radioactive tracer molecules that emit positrons when they decay.
The beam funneled positrons from the Namibian storm to the Fermi spacecraft.
ATRAP, in contrast, captures about five million positrons.
Barry Barish: It's a machine that will collide electrons and positrons.
网络释义

正电子

正电子(Positrons)：电子的反物质伙伴。正电子是有电子的相反质 ----------------------- 页面 159----------------------- 量的电子...

正子

放射性水分子放出正子（positrons）可和电子撞击而释放能量，产生二个光量子（photons）。此时利用PET就可以侦测到光量 …

阳电子

辐射防护守则 ... (2) 电子( electrons) (3) 阳电子( positrons) (4) 带电粒子( charged particles) ...
更新时间：2025-05-02 00:10

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