Asymmetry in the super-allowed beta-transitions of the A=9 isobars
Journal article, 2004
We report here on the recent beta-decay studies of the A = 9 isobar made at ISOLDE/CERN. Mirror beta transitions in the A=9 chain are compared and a large asymmetry factor is deduced for the transitions to high excitation energy in Be-9 (11.8 MeV) and B-9 (12.2 MeV) fed in the beta-decay of Li-9 and C-9 respectively. It is shown that the asymmetry is not due to experimental problems or differences in the mechanisms of breakup or in the spin of the states. Only differences in the partial decay branches of the breakup channels have been found. As no asymmetry is found in the gs to gs transition it must be due to the particular structure of these excited states.
LI-9
DECAY
SCATTERING
BE-9
Author
M. J. G. Borge
U. Prezado
U. C. Bergmann
R. Boutami
J. Cederkall
C. A. Diget
L. M. Fraile
H. O. U. Fynbo
Y. Jading
H. B. Jeppesen
Björn Jonson
Chalmers, Department of Experimental Physics, Subatomic Physics
I. Martel
Mikael Meister
Thomas Nilsson
Göran Hugo Nyman
Chalmers, Department of Experimental Physics, Subatomic Physics
K. Riisager
H. Simon
O. Tengblad
L. Weissman
Fredrik Wenander
Katarina Wilhelmsen
Chalmers, Department of Experimental Physics, Subatomic Physics
Nuclear Physics A
0375-9474 (ISSN)
Vol. 738 1-4 SUPPL. 206-210Subject Categories
Subatomic Physics
DOI
10.1016/j.nuclphysa.2004.04.074