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3. Recent HRIBF Research - Measurement of 10Be(d,p) 11Be Cross-Section in Inverse Kinematics at Several Energies
[K.T. Schmitt & K. L. Jones (Univ. of Tennessee), spokespersons]

Light neutron-rich 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. 11Be, in particular, is commonly used as a benchmark for theoretical studies because it exemplifies the distinctive properties of neutron-rich nuclei such as level inversion, and weakly bound ground states, leading to halo structure. Two recent experiments have been performed at HRIBF to study low-lying states in 11Be via the neutron transfer reaction 10Be(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 cutting-edge reaction calculations.

Data analysis is nearly complete for the experiment at 107 MeV. The preliminary differential cross-sections for the two bound states and first resonance are shown in Fig. 3-1. 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 batch-mode 10Be RIB beams, the first full implementation of ORRUBA, the QQQ silicon detector array for recoil detection, the Dual MCP for beam counting with real-time efficiency measurement, and a new Fast Ionization Chamber.

Figure 3-1: Measured differential cross-section for the population of the first three states in 11Be via 10Be(d,p) with a beam energy of 107 MeV.

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