Inclusive
Coulomb and
nuclear breakup of neutron-rich Ne, Mg, and Si isotopes,
N. Kobayashi, Tokyo
Institute of Technology, Japan − One-neutron
removal cross sections of 29,31Ne, 33,35,37Mg,
and 39,41Si
on Pb target were measured at about 240 MeV/nucleon at
RIBF(RI-Beam Factory) at
RIKEN. This
experiment aims at
extracting the inclusive Coulomb breakup cross sections of these
nuclei to see
if these nuclei can involve halo structures. The enhancement of
low-energy E1 strength,
called "soft E1 excitation", is a unique property of halo
nuclei. Hence, the
enhancement of Coulomb breakup
cross section can be used as a direct signal for halo
structures. The
result indeed showed a significant
enhancement of the Coulomb breakup cross section for 31Ne
and
systematic enhancements for 37Mg and 41Si
along isotopic
chains. This result
thus shows the
occurrence of soft E1 excitations, which suggests the
one-neutron halo
structure for 31Ne and the contributions of the
one-neutron halo
characters for 37Mg and 41Si.