CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

Improved Limit on Direct α Decay of the Hoyle State

O. S. Kirsebom ; M. Alcorta ; M. J. G. Borge ; M. Cubero ; C. Aa Diget ; L. M. Fraile ; B. R. Fulton ; H. O. U. Fynbo ; D. Galaviz ; Björn Jonson (Institutionen för fundamental fysik, Subatomär fysik) ; M. Madurga ; Thomas Nilsson (Institutionen för fundamental fysik, Subatomär fysik) ; Göran Nyman (Institutionen för fundamental fysik, Subatomär fysik) ; K. Riisager ; Olof Tengblad ; M. Turrión
Physical Review Letters (0031-9007). Vol. 108 (2012), 20, p. 202501.
[Artikel, refereegranskad vetenskaplig]

The current evaluation of the triple-α reaction rate assumes that the α decay of the 7.65 MeV, 0+ state in 12C, commonly known as the Hoyle state, proceeds sequentially via the ground state of 8Be. This assumption is challenged by the recent identification of two direct α-decay branches with a combined branching ratio of 17(5)%. If correct, this would imply a corresponding reduction in the triple-α reaction rate with important astrophysical consequences. We have used the 11B(3He,d) reaction to populate the Hoyle state and measured the decay to three α particles in complete kinematics. We find no evidence for direct α-decay branches, and hence our data do not support a revision of the triple-α reaction rate. We obtain an upper limit of 5×10-3 on the direct α decay of the Hoyle state at 95% C.L., which is 1 order of magnitude better than a previous upper limit.

Denna post skapades 2012-05-14. Senast ändrad 2014-09-02.
CPL Pubid: 157601


Läs direkt!

Lokal fulltext (fritt tillgänglig)

Länk till annan sajt (kan kräva inloggning)

Institutioner (Chalmers)

Institutionen för fundamental fysik, Subatomär fysik (2005-2013)


Stjärnors bildning och utveckling

Chalmers infrastruktur