R-matrix analysis of the beta decays of 12N and 12B
Journal article, 2010
The β decays of 12N and 12B have been studied at KVI and JYFL to resolve the composition of the broad and interfering 0+ and 2+ strengths in the triple-α continuum. For the first time a complete treatment of 3α decay is presented including all major breakup channels. A multilevel, many-channel R-matrix formalism has been developed for the complete description of the breakup in combination with the recently published separate analysis of angular correlations. We find that, in addition to the Hoyle state at 7.65 MeV, more than one 0+ and 2+ state is needed to reproduce the spectra. Broad 03+ and 22+ states are found between 10.5 and 12 MeV in this work. The presence of β strength up to the 12N Q-value window suggests the presence of additional 0+ and 2+ components in the 12C structure at energies above 12.7 MeV.
Author
S. Hyldegaard
M. Alcorta
B. Bastin
M. J. G. Borge
R. Boutami
S. Brandenburg
J. Buscher
P. Dendooven
C. Aa. Diget
P. Van Duppen
T. Eronen
S. P. Fox
L. M. Fraile
B. R. Fulton
H. O. U. Fynbo
J. Huikari
M. Huyse
H. B. Jeppesen
A. S. Jokinen
Björn Jonson
Chalmers, Applied Physics, Subatomic Physics
K. Jungmann
A. Kankainen
O. S. Kirsebom
M. Madurga
I. Moore
A. Nieminen
Thomas Nilsson
Chalmers, Applied Physics, Subatomic Physics
Göran Hugo Nyman
Chalmers, Applied Physics, Subatomic Physics
G.J.G. Onderwater
H. Penttilä
K. Peräjärvi
R. Raabe
K. Riisager
S. Rinta-Antila
A. Rogachevskiy
A. Saastamoinen
M. Sohani
Olof Tengblad
E. Traykov
Y. Wang
Katarina Wilhelmsen
Chalmers, Applied Physics, Subatomic Physics
H.W. Wilschut
J. Aysto
Physical Review C - Nuclear Physics
24699985 (ISSN) 24699993 (eISSN)
Vol. 81 2Subject Categories
Subatomic Physics
Roots
Basic sciences
DOI
10.1103/PhysRevC.81.024303