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Núcleos de corta vida en granos de hibonita de Murchison: evidencia para la evolución del sistema solar

K K Marhas¹, J N Goswami, A M Davis

¹Physical Research Laboratory, Ahmedabad 380009, India.

Science (New York, N.Y.)

|December 14, 2002

Resumen

El berilio-10 (10Be) de corta vida se detectó en los granos de hibonita del meteorito Murchison, lo que indica su origen en la irradiación de partículas energéticas en la nebulosa solar. Este hallazgo ayuda a distinguir las contribuciones de la nucleosíntesis estelar a los sólidos del sistema solar temprano.

Área de la Ciencia:

Cosmoquímica es la cosmoquímica.
La astrofísica nuclear es una astrofísica nuclear.
Ciencias planetarias Ciencias planetarias.

Sus antecedentes:

Los núcleos de corta vida en los meteoritos ofrecen información sobre la formación del sistema solar.
Los granos de Hibonita son fases minerales clave para el estudio de las condiciones tempranas del sistema solar.

Objetivo del estudio:

Investigar la presencia y el origen de núcleos de corta vida en los sólidos del Sistema Solar primitivo.
Para utilizar las anomalías isotópicas en los meteoritos para limitar los procesos nucleosintéticos.

Principales métodos:

Análisis de los granos de hibonita del meteorito Murchison.
Medición de las composiciones isotópicas, centrándose específicamente en los excesos de boro-10 (10B) atribuidos a la desintegración del berilio-10 (10Be).
Comparación con las abundancias esperadas de aluminio-26 (26Al) y calcio-41 (41Ca).

Principales resultados:

Se detectó un exceso de 10B en los granos de hibonita, consistente con la descomposición de 10Be.
No se encontró evidencia de descomposición de 26Al o 41Ca en los granos estudiados.
La abundancia observada de 10Be puede explicarse por la irradiación de partículas energéticas.

Conclusiones:

La irradiación de partículas energéticas es una fuente plausible de 10Be en la nebulosa solar temprana.
La ausencia de productos de desintegración de 26Al y 41Ca sugiere que estos núcleos probablemente se originaron en fuentes estelares, no por irradiación de partículas.
Este estudio ayuda a diferenciar entre los orígenes nucleosintéticos de los elementos en el sistema solar temprano.

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