New primary mechanisms for the synthesis of rare 9Be in early supernovae.
Phys Rev Lett
; 110(14): 141101, 2013 Apr 05.
Article
em En
| MEDLINE
| ID: mdl-25166974
ABSTRACT
We present two new primary mechanisms for the synthesis of the rare nucleus (9)Be, both triggered by ν-induced production of (3)H followed by (4)He((3)H,γ)(7)Li in the He shells of core-collapse supernovae. For progenitors of â¼ 8M(â), (7)Li((3)H,n(0))(9)Be occurs during the rapid expansion of the shocked He shell. Alternatively, for ultra-metal-poor progenitors of â¼ 11-15 M(â), (7)Li(n,γ)(8)Li(n,γ)(9)Li(e(-)ν(e))(9)Be occurs with neutrons produced by (4)He(ν(e),e(+)n)(3)H, assuming a hard effective ν(e) spectrum from oscillations (which also leads to heavy element production through rapid neutron capture) and a weak explosion (so the (9)Be survives shock passage). We discuss the associated production of (7)Li and (11)B, noting patterns in LiBeB production that might distinguish the new mechanisms from others.
Buscar no Google
Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Phys Rev Lett
Ano de publicação:
2013
Tipo de documento:
Article
País de afiliação:
Estados Unidos