Abstract
Measurements of the helium-cluster breakup and neutron removal cross-sections for neutron-rich Be isotopes 10–12,14Be are presented. These have been studied in the 30 to 42 MeV/nucleon energy range where reaction measurements are proposed to be sensitive to the cluster content of the ground-state wave-function. These measurements provide a comprehensive survey of the decay processes of the Be isotopes by which the valence neutrons are removed revealing the underlying α–α core-cluster structure. The measurements indicate that clustering in the Be isotopes remains important up to the drip-line nucleus 14Be and that the dominant helium-cluster structure in the neutron-rich Be isotopes corresponds to α–Xn–α.
Highlights
Measurements of the helium-cluster breakup and neutron removal cross-sections for neutron-rich Be isotopes 10–12,14Be are presented
Structural properties are known to differ from normal nuclear matter, as they are strongly influenced by the weak binding of the valence neutrons
Given that the breakup process proceeds from states inelastically excited above the helium decay threshold, and that states close to decay thresholds typically possess large cluster content [3], the breakup process should be sensitive to the cluster structure in the ground state via the overlap of the ground state and excited state
Summary
Measurements of the helium-cluster breakup and neutron removal cross-sections for neutron-rich Be isotopes 10–12,14Be are presented. We present comprehensive measurements of xHe-cluster, which were explored theoretically for the boron isotopes, and neutron breakup cross-sections for the beryllium isotopes A = 10, 11, 12 and 14.
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