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Atomic Nuclei: Magnetic Resonance01:05

Atomic Nuclei: Magnetic Resonance

731
The number of nuclear spins aligned in the lower energy state is slightly greater than those in the higher energy state. In the presence of an external magnetic field, as the spins precess at the Larmor frequency, the excess population results in a net magnetization oriented along the z axis. When a pulse or a short burst of radio waves at the Larmor frequency is applied along the x axis, the coupling of frequencies causes resonance and flips the nuclear spins of the excess population from the...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

702
In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
702
Potential Due to a Polarized Object01:29

Potential Due to a Polarized Object

459
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
459
Potential Due to a Magnetized Object01:24

Potential Due to a Magnetized Object

341
Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
The vector...
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Other Unique Bacteria01:18

Other Unique Bacteria

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Magnetic bacteria exhibit a directed movement called magnetotaxis, driven by structures called magnetosomes. These magnetosomes consist of chains of magnetic particles made of either magnetite (Fe₃O₄) or greigite (Fe₃S₄) and are organized in a linear conformation by a protein scaffold within invaginations of the cell membrane. The bacteria align along the north–south magnetic field lines, much like a compass needle. They are typically microaerophilic or anaerobic...
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Paramagnetism01:30

Paramagnetism

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Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
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Hyperpolarized Xenon for NMR and MRI Applications
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Hyperpolarized Xenon for NMR and MRI Applications

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マグネタールからの偏光X線

Roberto Taverna1, Roberto Turolla1,2, Fabio Muleri3

  • 1Department of Physics and Astronomy, University of Padova, I-35131 Padova, Italy.

Science (New York, N.Y.)
|November 10, 2022
PubMed
まとめ
この要約は機械生成です。

偏光X線観測により,磁星4U 0142+61は複雑な磁場を持っていることが明らかになった. 偏振はエネルギーによって変化し,磁星の磁気圏における放射線の散乱を示唆している.

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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科学分野:

  • 天体物理学
  • 高エネルギー天体物理学
  • 中性子星の研究

背景:

  • 非常に強力な磁場を持つニュートロン星です
  • マグネターの性質を研究するには,X線観測が不可欠です.
  • 磁場と表面の特性についての洞察を得ることができます.

研究 の 目的:

  • マグネタール4U 0142+61から放射されるX線の偏振を調査する.
  • この磁星からのX線偏振の程度とエネルギー依存度を決定する.
  • マグネタール放出機構のモデルをテストする.

主な方法:

  • イメージングX線極測探査機 (IXPE) を用いて観測した.
  • 4U 0142+61からX線の線形極化度と角度を測定した.
  • 2~8キロ電子ボルトのエネルギー帯域の偏振を分析した.

主要な成果:

  • 2〜8 keVの平均で 13.5 ± 0.8%の有意な線形偏振度が検出されました.
  • 観測されたエネルギー依存の極化: 15.0 ± 1.0% (2-4 keV),低極化 (~4-5 keV),および35.2 ± 7.1% (5.5-8 keV).
  • 偏り角が90度 偏り角が4~5ケヴォルト 偏り角が90度

結論:

  • 観測された極化特性は,熱面放射線と一致しています.
  • マグネタールの磁気圏内での 充電粒子の散乱は 放射線を再処理する可能性があります
  • これらの発見は,磁気圏の粒子相互作用を含むモデルを支持する.