Gamma-ray Observations of Explosive Nucleosynthesis Products

Abstract

In this review I discuss the various gamma-ray emission lines that are expected and have been observed from radioactive explosive nucleosynthesis products. The most important gamma-ray lines result from the decay chains of Ni-56, Ni-57, and Ti-44. Ni-56 is the prime explosive nucleosynthesis product of Type Ia supernovae, but Ni-56 is also a product of core-collapse supernovae. Gamma-ray line emission from its daughter product, Co-56, has been detected from SN1987A. The early occurrence of this emission indicates that some fraction of Ni-56, which is synthesized in the innermost supernova layers, must have mixed with the outermost ejecta. Special attention is given to the gamma-ray line emission of the decay chain of Ti-44, giving line emission at 68 keV, 78 keV, and 1157keV. Given its decay time of 86 yr, one expects this line emission from young supernova remnants. The Ti-44 production is very sensitive to the explosion properties This makes Ti-44 an ideal tool to study the inner layers of the supernova explosion. The gamma-ray line emission from Ti-44 has so far only been detected from the supernova remnant Cas A. I discuss these detections, which were made by COMPTEL and BeppoSAX, which suggest a Ti-44 yield of (1.5+/-1.0)x10^{-4} Msun. Moreover, I present some preliminary results of Cas A observations by INTEGRAL, which has yielded a 3sigma detection of the 68 keV line with the ISGRI instrument at a level consistent with the BeppoSAX results. A preliminary analysis of the vailable INTEGRAL-SPI data indicates that narrow line emission (Delta v < 1000 km/s) can be almost excluded at the 2sigma level. (Abridged)

Invited review given at the 35th COSPAR Scientific Assembly, Paris, July 18-25 2004, session E1.4 (joint session with E1.5) 'Young Neutron Stars and Supernova Remnants' edited by C. Rakowski and S. Chatterjee. 11 pages, AdSpR emulate style

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Cited by in corpus (12)

• Constraints on the Progenitor of Cassiopeia A
• Production and Distribution of ${}^{44}$Ti and ${}^{56}$Ni in a Three-dimensional Supernova Model Resembling Cassiopeia A
• The signature of 44Ti in Cassiopeia A revealed by IBIS/ISGRI on INTEGRAL
• Are Ti44-Producing Supernovae Exceptional?
• INTEGRAL survey of the Cassiopeia region in hard X rays
• The 40Ca(alpha,gamma)44Ti reaction in the energy regime of supernova nucleosynthesis
• An INTEGRAL/IBIS view of Young Galactic SNRs through the 44Ti gamma-ray lines
• A Comprehensive Search for Gamma-Ray Lines in the First Year of Data from the INTEGRAL Spectrometer
• Massive Stars and their Supernovae
• Reaction Rate Sensitivity of the Production of $\gamma$-ray Emitting Isotopes in Core-Collapse Supernova
• G0.57-0.018: A young supernova remnant? INTEGRAL and VLA observations
• Using X-ray observations to identify the particle acceleration mechanisms in VHE SNRs and "dark" VHE sources