|TITLE：||Big-bang nucleosynthesis with a long-lived CHAMP including helium-4 spallation process|
|(英語 / in English)|
Dr. Masato Yamanaka
|DATE：||May 17 (Tue.) 11:00 − 12:00|
|PLACE:||Kenkyu Honkan 1F, Meeting Room 1|
Long-lived charged massive particle (CHAMP) plays a role as catalyzer of exotic nuclear reactions in the Big-bang nucleosynthesis era. I discuss the primordial abundances of light elements involving the helium-4 spallation processes, the catalyzed fusion processes, and the internal conversion processes. Furthermore, I show the cosmologically favored parameter space in the minimal supersymmetric standard model with long-lived stau via solving the Lithium-7 problem.