From Last Time

• magic numbers andChart of the Nuclides: here and here
• solar abundances: odd/even isotopes separated; by neutrons number (isotone)
• nuclear energy levels illustrated: ⁴He, ¹⁰B, ¹²C, ²³⁸U

Short-Lived Astrophysical Decays: Supernova Sources

• supernova light curves

  SN 1987A (Type II: core collapse)

  Type Ia: thermonuclear, e.g., SN 1994D

• ⁴⁴Ti in supernovae: from gamma decays: SN 1987A, Cas A (cite)

Long-Lived Astrophysical Decays: Diffuse ²⁶Al and ⁶⁰Fe Emission

• decay scheme
• mapping preliminaries: Galactic space coordinates and longitude/latitude on celestial sphere
• COMPTEL 1.8 MeV gamma-ray sky images here and here: the Galaxy contains freshly synthesized ²⁶Al!
• INTEGRAL line spectra and detection of ²⁶Al line shift across Galactic plane, and its likely interpretation
• INTEGRAL detection of interstellar ⁶⁰Fe
• possible supernova remnant detection in Antlia
• radio radioactivity: ²⁶AlF molecule isotopomer

Nuclear Reactions

• notation
• energetics and Q-value
• basic physics: direct vs compound