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Related Concept Videos

Atomic Nuclei: Larmor Precession Frequency01:11

Atomic Nuclei: Larmor Precession Frequency

The earth's gravitational field produces a 'twisting force' perpendicular to the angular momentum of a spinning mass (such as a spinning top) that causes the mass to 'wobble' around the gravitational field axis in a phenomenon called precession. Similarly, the magnetic moment (μ) of a spinning nucleus precesses due to an external magnetic field directed along the z-axis. The precession of the magnetic moment vector about the magnetic field is called Larmor precession, and the angular frequency...
Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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. This...
Magnetic Field Lines01:19

Magnetic Field Lines

The representation of magnetic fields by magnetic field lines is very useful in visualizing the strength and direction of the magnetic field. Each of the magnetic field lines forms a closed loop. The field lines emerge from the north pole (N), loop around to the south pole (S), and continue through the bar magnet back to the north pole.
Magnetic field lines follow several hard-and-fast rules:
Atomic Nuclei: Types of Nuclear Relaxation01:28

Atomic Nuclei: Types of Nuclear Relaxation

Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers energy to a nearby...
Reduced Mass Coordinates: Isolated Two-body Problem01:12

Reduced Mass Coordinates: Isolated Two-body Problem

In classical mechanics, the two-body problem is one of the fundamental problems describing the motion of two interacting bodies under gravity or any other central force. When considering the motion of two bodies, one of the most important concepts is the reduced mass coordinates, a quantity that allows the two-body problem to be solved like a single-body problem. In these circumstances, it is assumed that a single body with reduced mass revolves around another body fixed in a position with an...
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...

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Related Experiment Video

Updated: Jul 6, 2026

Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

Direct Imaging of Laser-driven Ultrafast Molecular Rotation

Published on: February 4, 2017

gamma Rays from close binaries in the quiet stage.

L Maraschi, A Treves

    Nature
    |May 31, 1979
    PubMed
    Summary

    Gamma-ray observations can detect binary systems in their quiet state, revealing neutron stars with massive companions. This method offers a new way to find these systems before they enter their X-ray emitting phase.

    Area of Science:

    • Astronomy and Astrophysics
    • Stellar Evolution
    • Binary Star Systems

    Background:

    • Rotating neutron stars in binary systems are observed as X-ray pulsators, typically with massive companions.
    • The evolutionary path involves a long 'quiet state' preceding an active X-ray phase driven by stellar wind accretion.

    Purpose of the Study:

    • To propose gamma-ray observations as a method for detecting binary systems during their quiescent phase.
    • To estimate the number of such systems and compare with existing observational data (e.g., COS B).

    Main Methods:

    • Utilizing the recent discovery of gamma-ray emission from slow pulsars.
    • Analyzing theoretical models of binary system evolution, including mass transfer and supernova events.
    • Comparing predicted numbers of quiet binaries with COS B satellite results.

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    Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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    Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

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    Related Experiment Videos

    Last Updated: Jul 6, 2026

    Direct Imaging of Laser-driven Ultrafast Molecular Rotation
    10:52

    Direct Imaging of Laser-driven Ultrafast Molecular Rotation

    Published on: February 4, 2017

    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

    Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface
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    Simulating Imaging of Large Scale Radio Arrays on the Lunar Surface

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    Main Results:

    • Suggests gamma-ray observations are a viable strategy for identifying quiescent binary systems.
    • Provides a framework for understanding the long-term evolution of neutron star binaries.
    • Highlights the potential for discovering systems not detectable through radio or X-ray emissions.

    Conclusions:

    • Gamma-ray astronomy offers a novel approach to discovering neutron star binaries in their pre-X-ray emission phase.
    • This method can significantly increase the known population of such systems.
    • Understanding the 'quiet state' is crucial for a complete picture of binary evolution.