1.
a radioactive transuranic metallic element; produced by bombarding plutonium with helium nuclei.
一种放射性超铀元素，在用氦核子轰击钚时发现。
2.
Alpha particles--helium nuclei--were being hurled through the tube, in which an artificial mist had been created.
粒子——氦核——正通过试管被抛出，从而在试管中形成人造迷雾。
3.
Alpha particles are positively charged helium nuclei obtained from natural radioactive decay.
α粒子是从天然放射性蜕变得到的带正电的氦核。
4.
Standard theory predicts that two neutrinos are produced for every fusion of four protons into a helium nucleus.
标准理论预言，在由四个质子变成一个氦核的每一次聚变过程中要产生两个中微子。
5.
helium-mercury direct nuclear laser
氦汞直接核抽运激光器
6.
Distribution Characteristics of He-3 and Application in Fusion Fuel
氦-3分布特征及其在核燃料方面应用
7.
The deuteron can fuse with another proton to make a helium 3 nucleus.
氘核可以和另一个质子聚合以生成一个氦3核。
8.
Simple atom,extreme nucleus--Laser trapping and probing of exotic helium isotopes
简单的原子极端的核——对奇异氦的激光捕捉与探测
9.
The extreme heat and pressure then initiate a new nuclear reaction in the core– the conversion of helium to carbon.
在这种极高的温度和压力下核心启动了新的核反应——由氦到碳的转变。
10.
During this stage the Sun "burns" hydrogen in its core, combining hydrogen atoms into helium atoms in a process of nuclear fusion.
这一时期太阳在它的核心“燃烧”氢，将氢原子通过核聚变结合成氦原子。
11.
Using carbon-dating techniques, archaeologists can determine the age of many ancient objects by measurement the amount of radioactive carbon they contain.
参考译文：在太阳深处的内核中，氦和氢经过一系列高热原子核反应熔合作用产生了太阳的能量。
12.
The antimatter equivalent of helium.
反氦与氦等价的反物质
13.
a bomb releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium.
一种通过轻原子核（氢）在高温下聚变成氦原子时释放大量能量的炸弹。
14.
A dense core of incandescent helium is surrounded by a thin shell of hot, fusing hydrogen.
一个由白炽的氦形成的稠密的核外面包围着一层炽热熔化的氢薄壳。
15.
When helium burning takes over the main burden of energy generation in the star, the core expands somewhat, and the envelope contracts somewhat.
当氦燃烧成为星体能量产生的主要来源时，核心略微膨胀，而包层略微收缩。
16.
Nuclear reactions in such a star's core, the source of power for nearly its entire life, deplete the available hydrogen, then the helium.
恒星一生的能量来源，几乎都来自中心的核反应，过程中会耗尽所有可用的氢，然后是氦。
17.
Continuously tunable helium replenisher for long lifetime He-Cd laser
长寿命氦-镉激光器连续可调氦补充器
18.
Preparation of Helium-charaged Nanocrystalline Film and Study of Its Helium Storage Characteristic;
含氦纳米膜的制备及其固氦特性研究