Other
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005omeg.conf..446n&link_type=abstract
ORIGIN OF MATTER AND EVOLUTION OF GALAXIES 2003. Held 17-19 November 2003 in RIKEN, Wako, Saitama, Japan. Edited by M Terasawa,
Other
Scientific paper
Recent observations of extremely metal-poor stars suggest that the primary spallation process dominated the light element (Li,Be,B) nucleosynthesis in the early galaxy. To investigate the energy spectra of SN ejecta which mainly consist of C/O, we have performed numerical calculations of type Ic supernova explosions using a relativistic hydrodynamic code with realistic numerical models for massive stars and a realistic equation of states. Moreover, we estimate the yields of light elements by spallation reactions using the energy spectra from our numerical calculations together with empirical cross sections of the reactions. We find that the adiabatic index becomes larger than 4/3 in a mild explosion and the acceleration of ejecta becomes more efficient. We also find that not only highly energetic explosions like SN 1998bw but also normal Ic SNe explosions significantly accelerate their outermost layers beyond the threshold energy of spallation reactions. On the other hand, the accelerated ejecta lose their energy because of interactions with the interstellar neutral atoms before they undergo spallations with the interstellar H and/or He. Though the abundance ratios such as Li/Be and Be/B are compatible with observations, none of type Ic supernovae (SNe Ic) could be main sources of light elements in the Galactic halo, as long as most of the interstellar atoms are not ionized. If 99 % of the interstellar H are ionized, SNe Ic like SN 2002ap can be candidates of light element sources.
Nakamura Kazuo
Shigeyama Toshikazu
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