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单词 alpha decay
释义

alpha decay

英汉-汉英词典
阿尔法衰变;阿法衰减
词组 | 习惯用语
您要查找的是不是:
    alpha decay chain 衰变链
    alpha decay a 衰变
    alpha decay theory 衰变理论
    radioactive alpha decay 放射性阿尔法衰变
    hindered alpha decay 受阻阿伐衰变
    alpha decay energy 衰变能量;阿伐衰变能
    spectra in alpha decay 阿伐衰变谱
    systematic of alpha decay 阿伐衰变系统
alpha decay 阿尔法衰变;阿法衰减
原声例句
Crash Course 综合篇

So that thorium-234 that formed when uranium underwent alpha decay?

那么当铀经历 α 衰变时形成的钍 234 呢?

Crash Course 综合篇

In alpha decays, the sum of the atomic and mass numbers are always equal on either side of the equation.

alpha 衰变中,等式两边的原子数和质量数之和始终相等。

Crash Course 综合篇

First, there’s alpha decay, which is released when an unstable nucleus loses two protons and two neutrons, becoming a different element in the process.

首先是 alpha 衰变,当一个不稳定的原子核失去两个质子和两个中子时,它就会释放出来,在这个过程中变成不同的元素。

化学 Crash Course

This is called alpha decay and the particle that it emits is basically the same as a helium nucleus: two protons and two neutrons.

这称为 α 衰变,它发射的粒子与氦原子核基本相同:两个质子和两个中子。

Crash Course 综合篇

In alpha decay, there’s a parent nucleus – which is the original, unstable nucleus – and it decays into a daughter nucleus and an alpha particle, which is actually just the nucleus of a Helium atom.

alpha 衰变中,有一个母核——它是原始的、不稳定的核——它衰变成一个子核和一个 alpha 粒子,它实际上只是一个氦原子的核。

中文百科

Α衰变

阿尔法衰变

α衰变,又名阿尔法衰变,是一种放射性衰变(核衰变);发生α衰变时,一颗α粒子会从原子核中射出(附注:α粒子,又名阿尔法粒子,即氦-4核,4
2
He
,即一颗由2颗质子和2颗中子组成的原子核); α衰变发生后,原子核的质量数会减少4个单位,其原子序也会减少了2个单位。

下面之反应式式(I)是α衰变的一个例子。例如,铀-238通过α粒子发射的衰减以形成钍-234可以表示为:

{}^2{}^{38}_{92}\hbox{U}\;\to\;{}^2{}^{34}_{90}\hbox{Th}\;+\;{}^4_2\hbox{He}

式(I)也可写成式(II):


{}^{238}\hbox{U}\;\to\;^{234}\hbox{Th}\;+\;\alpha

α衰变是一种核分裂,当中涉及量子物理学中的穿隧效应,和β衰变不同的是α衰变是由强核力力场产生和控制。

一颗α粒子带有5兆电子伏特的动能(约等于一颗α粒子的总能量的0.13%),其移动速度是每秒15,000公里,即是只达到5%光速(光速是时速1,079,252,848.8公里);由于α粒子相对大的质量,其+2的电荷,以及相对慢的移动速度,它们实在太容易就会和其他原子核和粒子反应及失去其能量,α粒子在几厘米厚度的空气内就会被吸收。

英语百科

Alpha decay Α衰变

Visual representation of alpha decay
Alpha source beneath a radiation detector

Alpha decay or α-decay is a type of radioactive decay in which an atomic nucleus emits an alpha particle (helium nucleus) and thereby transforms or 'decays' into an atom with a mass number that is reduced by four and an atomic number that is reduced by two. An alpha particle is identical to the nucleus of a helium-4 atom, which consists of two protons and two neutrons. For example, uranium-238 decays to form thorium-234:

近义、反义、联想词
近义词
n.
decay, radioactive decay, disintegration

英英词典
alpha decay n.
  1. radioactive decay of an atomic nucleus that is accompanied by the emission of an alpha particle
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更新时间:2025/6/20 11:41:30