Ultra-heavy nuclei in the source composition of cosmic rays and their origin as related to the interstellar matter

✍ Scribed by Kunitomo Sakurai

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 256 KB
• Volume: 621
• Category: Article
• ISSN: 0375-9474
• DOI: 10.1016/s0375-9474(97)00212-1

✦ Synopsis

A possible mechanism for the formation of the source composition of ultra-heavy nuclei in cosmic rays is considered by taking into account the observed results of this composition. This composition indicates that ultra-heavy elements, together with siderophile ones, must have been relatively more efficiently condensed into the source matter of cosmic rays with volatile elements. Since the condensation temperature is higher than 1000K for these elements, this composition seems to have been produced by means of fractionation due to the condensation process of the elements somewhere in the expanding clouds ejected from type II supernova explosions or red supergiant stars, because ultra-heavy nuclei as observed in the source composition must have been synthesized mainly in the r-process taking place in these clouds.