介子

These galaxies are located in the direction of the constellation Virgo, and the radiation consists of particles called muons, which are so powerful they can penetrate about 2.5 kilometers of sea water or 900 meters of rock--enough to reach just about every living thing on Earth and damage its DNA.

这些星系位于Virgo星座的方向，并辐射一种被称为&介子&的粒子，这种粒子有着强大的贯穿力，它们可以穿透大约2.5公里的海水或者900米的岩石，这已经足以到达并破坏或地球的任何一种生物，并损坏它们的DNA。

The trick is to find ice or water that is relatively deep. That's because charged particles from space called cosmic rays produce neutrinos and muons when they hit the atmosphere.

&心宿二&望远镜的安放地址应选在深水或深冰层之下，原因在于：来自太空的带电粒子——宇宙射线在&袭击&大气层时产生中微子和μ介子。

You are simulating the part of the process where the protons hit a target rod and cause pions to be emitted, which decay into muons, which then proceed to a storage ring and decay into electrons and neutrinos.

您模仿氢核击中一把目标标尺和导致中介子散发，腐朽入muons ，然后进行对存贮圆环和朽烂入电子和中微子过程的部份。

The reacting cosmic particles producing nuclides primarily include secondary fast neutrons, thermal neutrons and slow negative muons. Due to the differential special distribution of these reacting particles, the production rates of Cosmogenic nuclides at different latitude, altitude and depth are different.

产生宁宙成因核素宇宙射线粒子主要是次生快中子、热中子和负慢介子，由于这些宇宙射线粒子在空间分布上的不同，地球上不同纬度、海拔高度和深度处的宇宙成因核素生成速率也表现出较大的差异。

Tags: anomalous muons , CDF , dark matter , DZERO , Higgs boson , neutrino

标签： 异常介子，民防部队，暗物质， DZERO ，希格斯玻色子，中微子

The pions produced at the edge of source influence the λ parameter.

在边缘区域内产生的π介子主要影响λ参数的变化。

These three pions may actually be joined together transiently as a compound particle during the interchange process.

在这个置换过程中，这三个介子也许真的在瞬间结合成一种合成粒子。

Take, for example, neutral pions. These are very small sub-atomic particles which undergo decay with the emission of two pulses of light.

我们以中性介子为例，它们是非常小的次原子颗粒，衰变时放射出两个脉冲光。

The target produces subatomic particles, mostly pions, which decay to produce neutrinos.

靶体发出亚原子粒子，主要是会快速衰变产生中微子的π介子。

Neutralino dark matter is thus expected to pair-annihilate in very dense regions, producing high-energy particles such as pions and electron-positron pairs and high-energy photons.

因此，在非常致密的区域中性超对称粒子可以成对湮灭，产生高能的粒子，如介子，正负电子对还有高能的光子。

Breath, muscle contraction of the buttocks; arch body, as far as possible to hold his head, right leg straight towards the ceiling (peg-leg knee in order to avoid muscle tension).

呼气，收缩臀部肌肉；拱起身体，尽量抬起头来，右腿伸直朝向天花板（膝微屈，以避免肌肉紧张）。

The cost of moving grain food products was unchanged from May, but year over year are up 8%.

粮食产品的运输费用与5月份相比没有变化，但却比去年同期高8％。