Probing proton halo effects in the 8B+64Zn collision around the Coulomb barrier
Journal article, 2021
Proton halo effects in the 8B+64Zn reaction at an energy around 1.5 times the Coulomb barrier have been studied at HIE-ISOLDE CERN using, for the first time, the only existing postaccelerated 8B beam. This, together with the use of a high granularity and large solid angle detection system, allowed for a careful mapping of the elastic angular distribution, especially in the Coulomb-nuclear interference region. Contrary to what is observed for the one-neutron halo nucleus 11Be on the same target in a similar energy range, the analysis of the elastic scattering angular distribution shows only a modest suppression of the Coulomb-nuclear interference peak, with no remarkable enhancement of the total reaction cross-section. Inclusive angular and energy distributions of 7Be produced in direct reaction processes have also been measured. The comparison of these data with the results of theoretical calculations for the elastic and non-elastic breakup contributions indicate that both processes are important. Overall, the experimental data suggest a 8B collision dynamics at the barrier very different from the one of neutron halo nuclei, showing only modest effects of coupling to continuum. This behaviour can be interpreted as due to the presence of the additional Coulomb interactions halo-core and halo-target together with the presence of the centrifugal barrier felt by the valence proton of 8B.
Elastic scattering
Halo nuclei
Breakup
Author
R. Spartà
National Institute for Nuclear Physics
University of Catania
A. Di Pietro
National Institute for Nuclear Physics
P. Figuera
National Institute for Nuclear Physics
O. Tengblad
CSIC - Instituto de Estructura de la Materia (IEM)
A. Moro
University of Seville
I. Martel
University of Huelva
J. P. Fernandez-Garcia
University of Seville
Jin Lei
National Institute for Nuclear Physics
L. Acosta
National Institute for Nuclear Physics
Universidad Nacional Autónoma de México
M. Borge
CSIC - Instituto de Estructura de la Materia (IEM)
Giovanni Bruni
Chalmers, Physics, Subatomic and Plasma Physics
J. Cederkall
Lund University
T. Davinson
University of Edinburgh
J. D. Ovejas
CSIC - Instituto de Estructura de la Materia (IEM)
L. M. Fraile
Complutense University
CERN
D. Galaviz
LIP - Lisboa
J. Halkjaer Jensen
Aarhus University
Björn Jonson
Chalmers, Physics, Subatomic, High Energy and Plasma Physics
M. La Cognata
National Institute for Nuclear Physics
A. Perea
CSIC - Instituto de Estructura de la Materia (IEM)
A. M. Sanchez-Benitez
University of Huelva
N. Soić
Ruder Boskovic Institute
S. Viñals
CSIC - Instituto de Estructura de la Materia (IEM)
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
0370-2693 (ISSN)
Vol. 820 136477Subject Categories
Accelerator Physics and Instrumentation
Subatomic Physics
Atom and Molecular Physics and Optics
DOI
10.1016/j.physletb.2021.136477