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Abstract
Coulomb breakup of unstable neutron rich nuclei 29,30Na around the 'island of inversion' has been studied at energy around 434 MeV/nucleon and 409 MeV/nucleon respectively. Four momentum vectors of fragments, decay neutron from excited projectile and γ-rays emitted from excited fragments after Coulomb breakup are measured in coincidence. For these nuclei, the low-lying dipole strength above one neutron threshold can be explained by direct breakup model. The analysis for Coulomb breakup of 29,30Na shows that large amount of the cross section yields the 28Na, 29Na core in ground state. The predominant ground-state configuration of 29,30Na is found to be 28Na(g.s) νs1/2 and 29Na(g.s) νs1/2,respectively. © Owned by the authors, published by EDP Sciences, 2014.
Highlights
Study of loosely bound nuclei far away from β-stability line provides many interesting and important properties of nuclei due to large neutron proton asymmetry [1,2,3]
The neutronrich Na, Mg and Al isotopes with similar mass-to-charge ratios were separated using the Fragment Separator (FRS) and transported to neighbouring cave C for complete kinematic measurements after Coulomb breakup
Before the target a plastic scintillator was used for reference time at cave C.The unreacted beam and and reaction fragments were bent by a large-acceptance dipole magnet (ALADIN) and tracked via two arrays of scintillating fiber detectors (GFI) and the TFW detectors which consists of plastic scintillator paddles
Summary
Study of loosely bound nuclei far away from β-stability line provides many interesting and important properties of nuclei due to large neutron proton asymmetry [1,2,3]. Many theoretical [8] and experimental [9, 10] studies have been performed to study the ground state configuration of these nuclei. In order to probe directly the ground state wave-function of these neutron-rich nuclei in and around ’island of inversion’, an experiment (S306) [12] was proposed and performed at GSI, Darmstadt.
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