他证实了，阿尔法粒子就是氦核。
And there he was able to identify the alpha particle as the helium nucleus.
我们有一个氦核和一个电子。
阿尔法粒子是氦核，它们是放射性衰变的产物。
Alpha particles are these helium nuclei, and they are the result of radioactive decay.
粒子是从天然放射性蜕变得到的带正电的氦核。
Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.
那么氦原子核的电荷量是多少呢？
这些粒子主要是质子、电子和氦原子核，并且当他们与地球高层大气中的原子核碰撞，就能产生次级粒子簇射。
The particles are generally protons , electrons and helium nuclei and when they collide with nuclei in the Earth's upper atmosphere they can produce shower s of daughter particles.
所以我们来对屏蔽举两个例子，如果我们在讨论氦，举例来说一个氦原子核或者氦原子。
So let's take two cases of shielding if we're talking about, for example, the helium, a helium nucleus or a helium atom.
星体燃烧了核内的氦，吞并了行星或伴星吗？
Did the star ignite helium at the core, swallow a planet, or swallow a companion star?
很多氦离子紧绕在星核附近，等到这一时代的到来才开始从新吸入气体。
"A lot of them held on to their cores, and they had to wait until this period was done before they could start bringing in gas again," Shull said.
这些粒子主要是质子、电子和氦原子核，并且当他们与地球高层大气中的原子核碰撞，就能产生次级粒子簇射。
The particles are generally protons, electrons and helium nuclei and when they collide with nuclei in the Earth's upper atmosphere they can produce showers of daughter particles.
结果表明，用能量涨落理论来计算过热液氦的均匀核化速率是一种比较合理的方法。
It turns out that it is a reasonable method to calculate the homogeneous nucleation rate of superheated liquid helium with the energy fluctuation theory.
正因为这样，氦4原子核的质量减少了。
Because of this, the quality of helium-4 nucleus has been reduced.
正因为这样，氦4原子核的质量减少了。
Because of this, the quality of helium-4 nucleus has been reduced.
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