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Coulomb excitation of Na-29,Na-30: Mapping the borders of the island of inversion

Abstract : Nuclear shell evolution in neutron-rich Na nuclei around N = 20 was studied by determining reduced transition probabilities, i.e., B(E2) and B(M1) values, in order to map the border of the island of inversion. To this end Coulomb-excitation experiments, employing radioactive Na-29,Na-30 beams with a final beam energy of 2.85 MeV/nucleon, were performed at REX-ISOLDE, CERN. De-excitation gamma rays were detected by the MINIBALL gamma-ray spectrometer in coincidence with scattered particles in a segmented Si detector. Transition probabilities to excited states were deduced. The measured B(E2) values agree well with shell-model predictions, supporting the idea that in the Na isotopic chain the ground-state wave function contains significant intruder admixture already at N = 18, with N = 19 having an almost pure two-particle-two-hole deformed ground-state configuration.
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http://hal.in2p3.fr/in2p3-00985758
Contributor : Christine Hadrossek <>
Submitted on : Wednesday, April 30, 2014 - 1:21:56 PM
Last modification on : Monday, November 16, 2020 - 12:54:04 PM

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M. Seidlitz, P. Reiter, R. Altenkirch, B. Bastin, C. Bauer, et al.. Coulomb excitation of Na-29,Na-30: Mapping the borders of the island of inversion. Physical Review C, American Physical Society, 2014, 89, pp.024309. ⟨10.1103/PhysRevC.89.024309⟩. ⟨in2p3-00985758⟩

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