Search research articles

ACERCA DE JoVE

Visión General Liderazgo Blog Centro de Ayuda JoVE

AUTORES

Proceso de Publicación Consejo Editorial Alcance y Políticas Revisión por Pares Preguntas Frecuentes Enviar

BIBLIOTECARIOS

Testimonios Suscripciones Acceso Recursos Consejo Asesor de Bibliotecas Preguntas Frecuentes

INVESTIGACIÓN

JoVE Journal Methods Collections JoVE Encyclopedia of Experiments Archivo

EDUCACIÓN

JoVE Core JoVE Business JoVE Science Education JoVE Lab Manual Centro de Recursos para Profesores Sitio de Profesores

Términos y Condiciones de Uso

Política de Privacidad

Videos de Conceptos Relacionados

Nuclear Stability

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...

Types of Radioactivity

Types of Radioactivity

The most common types of radioactivity are α decay, β decay, γ decay, neutron emission, and electron capture.
Alpha (α) decay is the emission of an α particle from the nucleus. For example, polonium-210 undergoes α decay:

Radioactivity and Nuclear Equations

Radioactivity and Nuclear Equations

Nuclear chemistry is the study of reactions that involve changes in nuclear structure. The nucleus of an atom is composed of protons and, except for hydrogen, neutrons. The number of protons in the nucleus is called the atomic number (Z) of the element, and the sum of the number of protons and the number of neutrons is the mass number (A). Atoms with the same atomic number but different mass numbers are isotopes of the same element.
A nuclide of an element has a specific number of protons and...

Atomic Nuclei: Nuclear Relaxation Processes

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...

Nuclear Transmutation

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...

Atomic Nuclei: Nuclear Spin State Population Distribution

Atomic Nuclei: Nuclear Spin State Population Distribution

Near absolute zero temperatures, in the presence of a magnetic field, the majority of nuclei prefer the lower energy spin-up state to the higher energy spin-down state. As temperatures increase, the energy from thermal collisions distributes the spins more equally between the two states. The Boltzmann distribution equation gives the ratio of the number of spins predicted in the spin −½ (N−) and spin +½ (N+) states.

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por

Same author

Precise test of internal-conversion theory: α<sub>K</sub> measurements for transitions in nine nuclei spanning 45 ≤ Z ≤ 78.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2017

Same author

β decay of (38)Ca: sensitive test of isospin symmetry-breaking corrections from mirror superallowed 0+ → 0+ transitions.

Physical review letters·2014

Same author

Precise test of internal-conversion theory: transitions measured in five nuclei spanning 50≤Z≤78.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2013

Same author

FT values measured to ±0.1% for superallowed beta transitions: metrology at sub-second time scales.

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2013

Same author

Do radioactive half-lives vary with the Earth-to-Sun distance?

Applied radiation and isotopes : including data, instrumentation and methods for use in agriculture, industry and medicine·2012

Same author

Experimental validation of the largest calculated isospin-symmetry-breaking effect in a superallowed Fermi decay.

Physical review letters·2011

Search research articles

Video Experimental Relacionado

Updated: Jul 12, 2026

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

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

Published on: May 3, 2019

Núcleos exóticos y su desintegración.

Science (New York, N.Y.)

|March 1, 1985

Resumen

Los avances en la ciencia nuclear permiten la síntesis de nuevos isótopos exóticos. Estos isótopos revelan nuevos modos de desintegración y mejoran el estudio de las fuerzas nucleares fundamentales y la interacción débil.

Área de la Ciencia:

Física nuclear es la física nuclear.
Física de las partículas Física de las partículas
La descomposición radiactiva.

Sus antecedentes:

Los aceleradores nucleares modernos y los métodos experimentales permiten la síntesis de nuevos isótopos.
El estudio de isótopos con proporciones extremas de protones-neutrones ofrece información sobre la estructura nuclear y las fuerzas fundamentales.

Objetivo del estudio:

Explorar nuevos fenómenos y modos de decaimiento en isótopos sintetizados.
Para utilizar el núcleo como un laboratorio para estudios de fuerzas fundamentales.
Para realizar pruebas precisas de las propiedades de la fuerza débil.

Principales métodos:

Síntesis de nuevos isótopos utilizando aceleradores nucleares avanzados.
Observación experimental y caracterización de los modos de desintegración nuclear.

Más Videos Relacionados

Nuclear Migration in the Drosophila Oocyte

Nuclear Migration in the Drosophila Oocyte

Published on: May 13, 2021

Neuronal Nuclei Isolation from Human Postmortem Brain Tissue

Neuronal Nuclei Isolation from Human Postmortem Brain Tissue

Published on: October 1, 2008

Videos de Experimentos Relacionados

Last Updated: Jul 12, 2026

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

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

Published on: May 3, 2019

Nuclear Migration in the Drosophila Oocyte

Nuclear Migration in the Drosophila Oocyte

Published on: May 13, 2021

Neuronal Nuclei Isolation from Human Postmortem Brain Tissue

Neuronal Nuclei Isolation from Human Postmortem Brain Tissue

Published on: October 1, 2008

Análisis de las reacciones y propiedades nucleares.

Principales resultados:

Observación de nuevos modos de desintegración, incluida la radioactividad de los protones y las desintegraciones de tritones con retraso beta, de dos protones, de dos neutrones y de tres neutrones.
Detección de la emisión de carbono-14 en la desintegración radiactiva.
Logro de pruebas precisas para las propiedades de la fuerza débil.

Conclusiones:

La síntesis de isótopos exóticos amplía nuestra comprensión de los fenómenos nucleares.
Los estudios de desintegración nuclear proporcionan datos críticos sobre las fuerzas fundamentales.
La física nuclear experimental continúa empujando los límites del descubrimiento científico.