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positrons

美 [ˈpɑzətrɑn]英 [ˈpɒzɪtrɒn]

n.【物】正子
网络正电子；阳电子

复数：positrons

positrons

英-汉英-英网络释义

positrons

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) ...

例句：

But the lightning flash detected by Fermi appeared to have produced about 100 trillion positrons: "That 's a lot , " he said .

不过，费尔米发现的闪电似乎产生了一百万亿正电子，“那可是个天文数字，”他说。

To make cold antihydrogen , the experimenters must slow down the antiprotons to a temperature similar to that of the positrons.

要制作冷的反氢，实验者必须将反质子减缓到与正子相近的温度。

It needed some years of development by the experimenters before the fact of the existence of positrons was established .

确立存在正电子这个事实还需要几年的实验发展。

If the material being tested has no defects in it , the positrons react a little differently .

如果所探测的材料不存在缺陷，正电子则表现得稍有不同。

In the case of a material with a defect , the positrons are trapped at nano-sized defects in the material .

如果材料有缺陷，这些正电子可以捕捉到纳米尺寸的材料缺陷。

Some antiproton annihilations produce a shower of positrons, which in turn produce 511-keV gamma rays, two of which may be detected .

有些反质子的消灭会放出大量正子，进而产生能量为 511keV 的 γ 射线，两者都可以侦测到。

The antiprotons are then pushed into the same trap as the positrons and left to mingle for a second or so.

然后将反质子推入到装有正电子的容器中，用大约一秒钟的时间等待它们混合。

For the positrons, one can think of the end potential as a ramp and the particle as a ball rolling up the ramp .

对正子来说，两端的位能就像是斜坡，粒子就如同滚上斜坡的球。

These positrons then come into contact with electrons in the body , and the two annihilate , releasing two gamma-ray photons .

正电子与人体组织中的电子发生作用而湮灭，产生两个伽玛射线光子。

It has developed better techniques for cooling both positrons and antiprotons, which should allow it to trap more anti-atoms.

该小组已开发出冷却正电子和反质子的改进技术，通过应用这些技术应该能够捕获到更多的反原子。

A chain of reactions , starting with a beam of laser-excited cesium atoms, transfers the positrons to the antiprotons to form antihydrogen .

一连串反应开始于以雷射光激发铯原子束，然后使正子移到反质子旁以形成反氢。

Coaxing hot and bothered antiprotons and positrons to couple is quite a task .

让处于高温与高速运动状态的反质子和正电子进行结合是一桩非常困难的工作。

Some radioactive substances emit positrons, the antiparticles to electrons, and are used in PET (positron-emission tomography ) scans .

有些放射性物质会放出正子，它是电子的反粒子，已经应用于正子断层扫描（PET ）。

But discovering the creation of positrons "gives us a very, very important clue as to what's happening . "

但是发现正电子的增加 “给了我们一个非常非常重要的线索来揭示闪电是如何发生的 ”。

This is because radioactive nuclear elements are formed in the giant outbursts of energy , and some of these decay by releasing positrons .

这是因为放射性核素在这巨大的爆炸能量中形成，其中一些放射出正电子而衰变。

Positrons moving slowly enough are brought to a halt and turned around on the ramp , keeping them inside the trap .

移动得慢的正子会停下来，然后反向滚下斜坡，留在阱里。

Another hint dates to the early 1970s , when astronomers detected vast numbers of electrons annihilating with positrons.

另一个迹象则要回溯到 1970年代早期，科学家侦测到电子与正子的湮灭反应。

The traps hold the positrons very securely : after an hour , an insignificant number of them are lost .

正子很安全的放在阱里：即使过了一个小时，也只有极少数会漏失。

It shows that the stacking faults in the alloy have not a remarkable effect of trapping positrons .

结果表明，该合金中的层错在实验误差范围内对正电子没有捕获效应。

Linear acceleration of electrons and positrons is what plasma-based accelerators are most suited for .

电子与正子的直线加速，是以电浆为基础的加速器最适合的领域。

The process would also create large numbers of electrons and positrons at the core of the Milky Way.

这个过程也会在银河中心产生大量的电子和反电子。

Some astronomers have suggested that exploding stars could produce the positrons .

一些天文学家猜测爆炸的恒星能够产生这些正电子。

During a PET scan , the patient is injected with radioactive tracer molecules that emit positrons when they decay.

正电子断层扫描仪进行人体扫描的时候，病人被注入正电子放射性核素，然后推入检测环。

Normally, it is impossible to distinguish Cherenkov radiation generated by positrons from that created by electrons .

通常电子和正电子创造的切伦科夫辐射是不可能区分开的。

The beam funneled positrons from the Namibian storm to the Fermi spacecraft .

那道光线把来自纳米比亚暴风雨的正电子传到费尔米太空船。

ATRAP, in contrast , captures about five million positrons.

相较之下，ATRAP 可以捕捉到约 500万个正子。

Barry Barish: It 's a machine that will collide electrons and positrons .

巴里·巴里斯：这是对撞电子和正电子的机器。

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