Study of light n-rich nuclei via one-neutron knockout reactions
By C. Rodriguez-Tajes - Univ. Santiago de Compostela
One-neutron knockout reactions have been used in this work to explore the evolution of the nuclear structure close to the neutron drip-line, where the neutron excess and the low binding energies can lead to important structural changes. This is the case for neutron halo configurations, the dissappearence of the N = 8 closed shell in 11Li or 12Be and the appearence of new sub-shell closures at N = 14 and 16 for oxygen isotopes, and the so-called island of inversion at N ~ 20.
Using the FRS spectrometer at GSI (Darmstadt, Germany), the longitudinal-momentum distributions of the emerging knockout fragments were measured along with the one-neutron removal cross-sections. The setup also included a set of Ge detectors (MINIBALL), which allowed to disentangle for a few cases the different states of the fragment populated in the one-neutron knockout reactions.
Thirty‐eight different isotopes, ranging from C to Al, were studied and the region between N 8 and 22 was closely examined. Particular attention has been paid to the C, N, F, O and Ne isotopic chains.