## Friday, December 30, 2011

### nucleosynthesis

there is a gap in element production: big bang nucleosynthesis produce everything up to lithium, and stars start at producing carbon, by triple-alpha fusion. in what way are beryllium ($Z=4$) and boron ($Z=5$) produced?

#### 1 comment:

1. beryllium and boron are produced by spallation in the interstellar medium, i.e. by cosmic ray protons and neutrons impacting on heavier nuclei and destroying them.