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Videos de Conceptos Relacionados

Nuclear Fusion02:45

Nuclear Fusion

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...
Nuclear Stability03:18

Nuclear Stability

Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
To hold positively charged protons together in the...
Nuclear Fission02:50

Nuclear Fission

Many heavier elements with smaller binding energies per nucleon can decompose into more stable elements that have intermediate mass numbers and larger binding energies per nucleon—that is, mass numbers and binding energies per nucleon that are closer to the “peak” of the binding energy graph near 56. Sometimes neutrons are also produced. This decomposition of a large nucleus into smaller pieces is called fission. The breaking is rather random with the formation of a large number of different...
Schwarzschild Radius and Event Horizon01:21

Schwarzschild Radius and Event Horizon

No object with a finite mass can travel faster than the speed of light in a vacuum. This fact has an interesting consequence in the domain of extremely high gravitational fields.
The minimum speed required to launch a projectile from the surface of an object to which it is gravitationally bound so that it eventually escapes the object’s gravitational field is called the escape velocity. The escape velocity is independent of the mass of the object. Merging the idea of escape velocity with the...
Detection of Black Holes01:10

Detection of Black Holes

Although black holes were theoretically postulated in the 1920s, they remained outside the domain of observational astronomy until the 1970s.
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Nuclear Transmutation

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 protons being...

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Video Experimental Relacionado

Updated: Jun 22, 2026

Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
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Published on: December 14, 2017

Una supernova de colapso de núcleo de baja energía sin una envoltura de hidrógeno.

S Valenti1, A Pastorello, E Cappellaro

  • 1Astrophysics Research Centre, School of Mathematics and Physics, Queen's University Belfast, Belfast BT7 1NN, UK. s.valenti@qub.ac.uk

Nature
|June 5, 2009
PubMed
Resumen

Los astrónomos descubrieron SN 2008ha, una supernova débil y pobre en hidrógeno. Este hallazgo puede vincular supernovas débiles con estallidos de rayos gamma de larga duración, previamente no asociados con supernovas visibles.

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Setting Limits on Supersymmetry Using Simplified Models
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Setting Limits on Supersymmetry Using Simplified Models

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Laser-heating and Radiance Spectrometry for the Study of Nuclear Materials in Conditions Simulating a Nuclear Power Plant Accident
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Setting Limits on Supersymmetry Using Simplified Models
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Setting Limits on Supersymmetry Using Simplified Models

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Área de la Ciencia:

  • * Astrofísica es la astrofísica.
  • * Evolución estelar de las estrellas.
  • * Física de las Supernovas.

Sus antecedentes:

  • * Las estrellas masivas (>25-30 masas solares) pueden convertirse en estrellas Wolf-Rayet deficientes en hidrógeno debido a los fuertes vientos estelares.
  • * El colapso del núcleo en estrellas masivas puede producir supernovas de baja energía con luminosidad débil y baja energía cinética.
  • * Un origen alternativo para las supernovas de baja energía es el colapso de núcleos de oxígeno-neón en estrellas de 7-9 masas solares.
  • * Anteriormente, no se habían observado supernovas débiles, con deficiencia de hidrógeno y colapso del núcleo.

Objetivo del estudio:

  • * Para informar sobre el descubrimiento y las características de SN 2008ha, una supernova débil y pobre en hidrógeno.
  • * Para investigar la posible clasificación errónea de supernovas débiles similares como eventos termonucleares peculiares (similares a SN 2002cx).
  • * Para explorar la conexión entre supernovas débiles, despojadas de hidrógeno y supernovas de colapso de núcleo y estallidos de rayos gamma de larga duración.

Principales métodos:

  • * Astronomía observacional: Detección y análisis de SN 2008ha.
  • * Análisis espectroscópico para determinar las propiedades de las supernovas (por ejemplo, deficiencia de hidrógeno, luminosidad).
  • * Modelado teórico para vincular las características de las supernovas observadas con las vías de evolución estelar.

Principales resultados:

  • * SN 2008 ha sido identificada como una supernova débil y pobre en hidrógeno.
  • * Propuesta de que eventos similares pueden haber sido clasificados erróneamente como supernovas similares a SN 2002cx.
  • * Se estableció una posible asociación entre supernovas débiles, despojadas de hidrógeno y estallidos de rayos gamma de larga duración.

Conclusiones:

  • * SN 2008ha representa una nueva clase de supernovas débiles observadas.
  • * La clasificación errónea de eventos similares podría explicar la falta de observación anterior.
  • * Este descubrimiento proporciona un posible vínculo observacional con las explosiones de rayos gamma de larga duración.