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関連する概念動画

Subatomic Particles03:37

Subatomic Particles

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Dalton was only partially correct about the particles that make up matter. All matter is composed of atoms, and atoms are composed of three smaller subatomic particles: protons, neutrons, and electrons. These three particles account for the mass and the charge of an atom.
92.9K
Hess's Law03:40

Hess's Law

44.1K
There are two ways to determine the amount of heat involved in a chemical change: measure it experimentally, or calculate it from other experimentally determined enthalpy changes. Some reactions are difficult, if not impossible, to investigate and make accurate measurements for experimentally. And even when a reaction is not hard to perform or measure, it is convenient to be able to determine the heat involved in a reaction without having to perform an experiment.
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Nuclear Fusion02:45

Nuclear Fusion

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The process of converting very light nuclei into heavier nuclei is also accompanied by the conversion of mass into large amounts of energy, a process called fusion. The principal source of energy in the sun is a net fusion reaction in which four hydrogen nuclei fuse and ultimately produce one helium nucleus and two positrons.
A helium nucleus has a mass that is 0.7% less than that of four hydrogen nuclei; this lost mass is converted into energy during the fusion. This reaction produces about...
33.2K
Nuclear Transmutation03:20

Nuclear Transmutation

12.9K
Nuclear transmutation is the conversion of one nuclide into another. It can occur by the radioactive decay of a nucleus, or the reaction of a nucleus with another particle. The first manmade nucleus was produced in Ernest Rutherford’s laboratory in 1919 by a transmutation reaction, the bombardment of one type of nuclei with other nuclei or with neutrons. Rutherford bombarded nitrogen-14 atoms with high-speed α particles from a natural radioactive isotope of radium and observed...
12.9K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

3.0K
All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
3.0K
Mass Analyzers: Common Types01:19

Mass Analyzers: Common Types

2.0K
The quadrupole mass analyzer consists of four cylindrical metal rods arranged in a diamond carrying a DC voltage and a radio-frequency AC voltage. The motion of ions through the quadrupole depends on the field strength, causing only ions of a certain m/z to resonate successfully and strike the detector at a given field strength. Though the transmission rate for these analyzers is high, the exact elemental composition of the sample is not determined because of low resolution; however, they are...
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Updated: May 2, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

7.1K

閉じ込められた抗水素.

G B Andresen1, M D Ashkezari, M Baquero-Ruiz

  • 1Department of Physics and Astronomy, Aarhus University, DK-8000 Aarhus C, Denmark.

Nature
|November 19, 2010
PubMed
まとめ
この要約は機械生成です。

科学者たちは,基本的対称性や反物質重力の精度試験の重要なステップである反水素原子を成功裏に閉じ込めました. この画期的な発見により,水素で実施されたものと類似した,反原子の詳細なスペクトロスコピー研究が可能になった.

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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
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Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

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関連する実験動画

Last Updated: May 2, 2026

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving
11:21

Cooling an Optically Trapped Ultracold Fermi Gas by Periodical Driving

Published on: March 30, 2017

7.1K
Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps
11:45

Experimental Methods for Trapping Ions Using Microfabricated Surface Ion Traps

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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh
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Preparing an Isotopically Pure 229Th Ion Beam for Studies of 229mTh

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科学分野:

  • 原子物理学 原子物理学とは
  • アンチマター研究における反物質の研究
  • 基本的な対称性は,

背景:

  • 抗水素 (反陽子と正陽子の結合状態) を含む反物質は生成されているが,限られているわけではない.
  • 充電結合/対称性/時間逆転 (CPT) 定理の精度テストには,反水素のスペクトル検査が必要です.
  • 反物質の重力行動を理解することは,重要な研究分野です.

研究 の 目的:

  • 抗水素原子の捕獲を実証するために.
  • 反原子の精度測定を可能にするために.
  • 基本的対称性のモデル独立テストを容易にする.

主な方法:

  • 抗陽子と陽子から反水素をCERNで生成する.
  • 磁気トラップを使用して,反水素原子を閉じ込めます.
  • アニヒレーションイベントを通じて,閉じ込められた抗水素の制御された放出を観察する.

主要な成果:

  • 反水素原子を成功裏に閉じ込めました.
  • 磁気トラップから制御された解放と一致する38の消滅イベントが観察されました.
  • 抗水素の将来の精密スペクトロスコピーのための方法を確立しました.

結論:

  • 抗水素の捕獲は,現在実験的に実証されています.
  • これは,反原子の精度測定のための道を開く.
  • 将来の実験では,反水素を研究するために,水素のために開発された技術を使用することができます.