Direct Observations of Galactic Synthesis of the Elements

Details Direct Observations of Galactic Synthesis of the Elements Direct Observations of Galactic Synthesis of the Elements

Apr 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997aps..apr..j101l&link_type=abstract

American Physical Society, APS/AAPT Joint Meeting, April 18-21, 1997, abstract #J1.01

Physics

Scientific paper

The science of nucleosynthesis attempts to explain the origin and abundance evolution of the nuclei. Detailed models of stars, their evolution, explosion, and cycling of their products through the various phases of Galactic are largely successful in explaining the measured solar system abundances as the standard condition of the interstellar matter 4.6 billion years ago at our particular location in the Galaxy. Further progress requires better and more detailed observational constraints. A promising, but still difficult, technique is to measure the nuclear lines from radioactive decay of unstable nuclei produced in the nucleosynthesis events. These gamma-ray photons penetrate the entire Galaxy and carry unique information. Those nuclei with short lifetimes can be detected from individual events, providing specific constraints on the nuclear burning conditions and dynamics. Those with longer lifetimes provide diffuse glows of nuclear lines that shows the distribution and rate of their synthesis over the past mean lifetime -- the current global context of nucleosynthesis. We will discuss some of the highlights and difficulties of recent gamma-ray line observations and hopes for future progress, emphasizing those involving, and related to, the origin and evolution of the light elements.

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