Nucleosynthesis and gamma-ray lines
Nikos Prantzos (UPMC, Institut d'Astrophysique de Paris)
TL;DR
This paper reviews the role of gamma-ray spectroscopy in nuclear astrophysics, focusing on radioactivities from massive stars and supernovae, and discusses recent observational findings from INTEGRAL related to nucleosynthesis products.
Contribution
It provides a concise overview of current issues in gamma-ray line astronomy, emphasizing recent INTEGRAL observations of radioactive isotopes and positron annihilation.
Findings
Detection of Ti-44 from CasA supernova remnant
Observation of Al-26 and Fe-60 from massive stars
Analysis of 511 keV positron annihilation emission in the Galaxy
Abstract
Astrophysical gamma-ray spectroscopy is an invaluable tool for studying nuclear astrophysics, supernova structure, recent star formation in the Milky Way and mixing of nucleosynthesis products in the interstellar medium. After a short, historical, introduction to the field, I present a brief review of the most important current issues. Emphasis is given to radioactivities produced by massive stars and associated supernova explosions, and in particular, those related to observations carried out by INTEGRAL: short-lived Ti-44 from CasA and long-lived Al-26 and Fe-60 from massive stars. The observed 511 keV emission from positron annihilation in the Galaxy and the role of stellar radioactivity and other potential positron sources are also discussed.
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