Evidence of a new state in Be-11 observed in the Li-11 beta-decay
Journal article, 2009
Coincidences between charged particles emitted in the beta-decay of Li-11 were observed using highly segmented detectors. The breakup channels involving three particles were Studied in full kinematics allowing for the reconstruction of the excitation energy of the Be-11 states participating in the decay. In particular, the contribution of a previously unobserved state at 16.3 MeV in Be-11 has been identified selecting the alpha + He-7 -> alpha + He-6 + n channel. The angular correlations between the alpha particle and the center of mass of the He-6 + n system favors spin and parity assignment of 3/2(-) for this state as well as for the previously known state at 18 MeV. (C) 2009 Elsevier B.V. All rights reserved.
radioactivity li-11(beta(-)) [from ta(p
partial decay branches
gamma
particles
energy-levels
emission
radioactivity
spin and parity assignment
identification of new level in be-11
he-6 energy
light-nuclei
charged particles coincidences
x)]
halo structure
measured beta-delayed he-4
Author
M. Madurga
CSIC - Instituto de Estructura de la Materia (IEM)
M. J. G. Borge
CSIC - Instituto de Estructura de la Materia (IEM)
M. Alcorta
CSIC - Instituto de Estructura de la Materia (IEM)
L.M. Fraile
Complutense University
H. O. U. Fynbo
Aarhus University
Björn Jonson
Chalmers, Applied Physics, Subatomic Physics
O. Kirsebom
Aarhus University
G. Martinez-Pinedo
Helmholtz
Thomas Nilsson
Chalmers, Applied Physics, Subatomic Physics
Göran Hugo Nyman
Chalmers, Applied Physics, Subatomic Physics
A. Perea
CSIC - Instituto de Estructura de la Materia (IEM)
A. Poves
Universidad Autonoma de Madrid (UAM)
K. Riisager
Aarhus University
Olof Tengblad
CSIC - Instituto de Estructura de la Materia (IEM)
Elisabeth Tengborn
Chalmers, Applied Physics, Subatomic Physics
J. Van der Walle
CERN
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
0370-2693 (ISSN)
Vol. 677 5 255-259Subject Categories
Subatomic Physics
DOI
10.1016/j.physletb.2009.05.050