On the beta-decay of C-9
Artikel i vetenskaplig tidskrift, 2001
In beta -decay experiments on C-9 at CERN/ISOLDE the beta -strength was determined to the ground state, the 12.2 MeV excited state and the Isobaric Analog State (IAS) at 14.655 MeV in B-9. A large beta -strength asymmetry is deduced for the mirror transitions of C-9 and Li-9 to states around 12 MeV excitation energy. A satisfactory description of the three-body decay from a narrow energy region around the 12.2 MeV resonance is obtained within a sequential model involving the ground and first-excited states of Li-5 and Be-8. From the study of angular correlations the spin of the 12.2 MeV state is determined as 5/2(-). For the first time the population of the IAS is observed in beta -decay and new information on the decay of this state is obtained. The advantages of a closely packed. highly segmented detector setup are demonstrated. (C) 2001 Elsevier Science B.V. All rights reserved.
SHELL-MODEL
measured beta-delayed E-p
double-sided silicon strip detectors
EMISSION
X)]
STATES
DELAYED PROTON
p
NUCLEAR SYSTEM
Ca(p
mass-separated source
angular correlations
A=9 beta-decay asymmetry.
LIGHT-NUCLEI
CONTINUUM
LI-9
strengths
B-9 deduced beta-branching
decay mechanism features
alpha alpha-coin.
E alpha
ASYMMETRY
C-9(beta(+)) [from O
DRIP-LINE
Författare
U. C. Bergmann
M. J. G. Borge
R. Boutami
L. M. Fraile
H. O. U. Fynbo
P. Hornshoj
Björn Jonson
Chalmers, Institutionen för experimentell fysik, Subatomär fysik
Karin Markenroth
Chalmers, Institutionen för experimentell fysik, Subatomär fysik
I. Martel
I. Mukha
Thomas Nilsson
Chalmers, Institutionen för experimentell fysik, Subatomär fysik
Göran Hugo Nyman
Chalmers, Institutionen för experimentell fysik, Subatomär fysik
A. Oberstedt
Y. P. Alonso
K. Riisager
H. Simon
O. Tengblad
Fredrik Wenander
Katarina Wilhelmsen Rolander
Chalmers, Institutionen för experimentell fysik, Subatomär fysik
Nuclear Physics A
0375-9474 (ISSN)
Vol. 692 3-4 427-450Ämneskategorier
Subatomär fysik
DOI
10.1016/S0375-9474(01)00650-9