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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...
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NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

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Atomic Emission Spectroscopy: Instrumentation01:22

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Investigation of Early Plasma Evolution Induced by Ultrashort Laser Pulses
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El descubrimiento de un púlsar binario de milisegundos a través de pulsaciones de rayos gamma.

H J Pletsch1, L Guillemot, H Fehrmann

  • 1Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), D-30167 Hannover, Germany. holger.pletsch@aei.mpg.de

Science (New York, N.Y.)
|November 1, 2012
PubMed
Resumen

Los astrónomos descubrieron PSR J1311-3430, un púlsar de milisegundos, utilizando datos de rayos gamma. Esta estrella de neutrones reciclada tiene el período orbital más corto jamás encontrado para un pulsar binario impulsado por espín.

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Área de la Ciencia:

  • * Astrofísica es la astrofísica.
  • * Astrofísica de alta energía.
  • * Física de las estrellas de neutrones física de las estrellas de neutrones

Sus antecedentes:

  • * Los púlsares de milisegundos son viejas estrellas de neutrones con altas velocidades de rotación.
  • * Anteriormente, estos

Objetivo del estudio:

  • * Para detectar e identificar nuevos púlsares utilizando datos de rayos gamma.
  • * Para investigar la naturaleza de una fuente no identificada de rayos gamma.

Principales métodos:

  • * Realizó una búsqueda ciega de computación intensiva de datos de rayos gamma del Telescopio de Gran Área Fermi.
  • * Se utilizaron restricciones parciales de datos ópticos para refinar la búsqueda.

Principales resultados:

  • * Se ha detectado un púlsar de 2,5 milisegundos, PSR J1311-3430.
  • * Identificó el púlsar como la fuente de un viejo enigma de rayos gamma.
  • * Encontró el púlsar en una órbita circular con un período de 93 minutos, el más corto conocido para un binario de púlsar impulsado por espín.

Conclusiones:

  • * El descubrimiento confirma la existencia de púlsares de milisegundos detectables en rayos gamma.
  • * PSR J1311-3430 representa un nuevo récord para el período orbital más corto en un pulsar binario impulsado por espín.
  • * Este hallazgo abre nuevas vías para la investigación de púlsares y la comprensión de binarios de objetos compactos.