
3. Recent HRIBF Research  Measurement of ^{10}Be(d,p)
^{11}Be CrossSection in Inverse Kinematics at Several Energies
[K.T. Schmitt & K. L. Jones (Univ. of Tennessee), spokespersons]
Light neutronrich nuclei present an excellent arena for studying the
evolution of nuclear structure as they represent the nuclei with the
most extreme neutron to proton ratios. ^{11}Be, in particular, is
commonly used as a benchmark for theoretical studies because it
exemplifies the distinctive properties of neutronrich nuclei such as
level inversion, and weakly bound ground states, leading to halo
structure. Two recent experiments have been performed at HRIBF to
study lowlying states in ^{11}Be via the neutron transfer reaction
^{10}Be(d,p) in inverse kinematics at a range of energies between 60 MeV
and 107 MeV. The cross sections measured in these experiments will be
used to help characterize sources of uncertainty in cuttingedge
reaction calculations.
Data analysis is nearly complete for the experiment at 107 MeV. The
preliminary differential crosssections for the two bound states and
first resonance are shown in Fig. 31. Analysis of the data at 60, 75,
and 90 MeV and reaction calculations are ongoing. Several new
experimental tools were used for these experiments, including
batchmode ^{10}Be RIB beams, the first full implementation of ORRUBA,
the QQQ silicon detector array for recoil detection, the Dual MCP for
beam counting with realtime efficiency measurement, and a new Fast
Ionization Chamber.
Figure 31: Measured differential
crosssection for the population of the first three states in ^{11}Be via
^{10}Be(d,p) with a beam energy of 107 MeV.
