Structure of 33Mg sheds new light on the N=20 island of inversion

doi:10.1016/j.physletb.2010.02.008

Physics Letters B

Volume 685, Issues 4–5, 8 March 2010, Pages 253-257

https://doi.org/10.1016/j.physletb.2010.02.008 Get rights and content

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Abstract

The first reaction spectroscopy on the ground state structure of ³³Mg through the measurement of the longitudinal momentum distribution from the one-neutron removal reaction using a C target at $898 A MeV$ is reported. The experiment was performed at the FRS, GSI. The distribution has a relatively narrow width ( $150 \pm 3 MeV / c$ (FWHM)) and the one-neutron removal cross-section is $74 \pm 4 mb$ . An increased contribution from the $2 p_{3 / 2}$ orbital is required to explain the observation showing its lowering compared to existing model predictions. This provides new information regarding the configuration of ³³Mg and the island of inversion.

Keywords

Nucleon removal or knockout reactions

Shell structure

Magic number

Radioactive beams

Eikonal model