Evidence of a new state in Be-11 observed in the Li-11 beta-decay
Artikel i vetenskaplig tidskrift, 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
Författare
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
Universidad Complutense de Madrid
H. O. U. Fynbo
Aarhus Universitet
Björn Jonson
Chalmers, Teknisk fysik, Subatomär fysik
O. Kirsebom
Aarhus Universitet
G. Martinez-Pinedo
Helmholtz
Thomas Nilsson
Chalmers, Teknisk fysik, Subatomär fysik
Göran Hugo Nyman
Chalmers, Teknisk fysik, Subatomär fysik
A. Perea
CSIC - Instituto de Estructura de la Materia (IEM)
A. Poves
Universidad Autonoma de Madrid (UAM)
K. Riisager
Aarhus Universitet
Olof Tengblad
CSIC - Instituto de Estructura de la Materia (IEM)
Elisabeth Tengborn
Chalmers, Teknisk fysik, Subatomär fysik
J. Van der Walle
CERN
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
0370-2693 (ISSN)
Vol. 677 5 255-259Ämneskategorier
Subatomär fysik
DOI
10.1016/j.physletb.2009.05.050