Proton-halo Effects in the B-8+Ni-58 Reaction Near the Coulomb Barrier

E. F. Aguilera, Inst Nacl Investigadores Nucl,
E. Martinez-Quiroz, Inst Nacl Investigadores Nucl
P. Rosales, Inst Nacl Investigadores Nucl
D. Lizcano, Inst Nacl Investigadores Nucl
A. Gomez-Camacho, Inst Nacl Investigadores Nucl
J. J. Kolata, University of Notre Dame
L. O. Lamm, University of Notre Dame
V. Guimaraes, University of Sao Paolo
R. Lichtenthaler, University of Sao Paolo
O. Camargo, University of Sao Paolo
F. D. Becchetti, University of Michigan - Ann Arbor
H. Jiang, University of Michigan - Ann Arbor
Paul DeYoung, Hope College
P. Mears, Hope College
T. L. Belyaeva, Universidad Autonoma Estado Mexico

Conference Information: 32nd Symposium on NuclearPhysics
Cocoyoc, MEXICO
JAN 05-08, 2009

Abstract

Elastic scattering of B-8 and Be-7 on a Ni-58 target has been measured at energies near the Coulomb barrier. The total reaction cross sections were deduced from Optical-model fits to the experimental angular distributions. Comparison with other systems shows evidence for proton-halo effects on B-8, as well as for neutron-halo on He-6 reactions. While the enhancement in the cross section observed for B-8 is explained in terms of projectile breakup, in the case of He-6 reactions, the particle transfer proces explains the observed enhancement.