Elsevier

Physics Letters B

Volume 640, Issue 3, 7 September 2006, Pages 86-90
Physics Letters B

Direct evidence for the onset of intruder configurations in neutron-rich Ne isotopes

https://doi.org/10.1016/j.physletb.2006.06.061Get rights and content

Abstract

We report on direct experimental evidence of the population of the 3/2 intruder state in 27Ne in the knockout of a single neutron from the ground state of 28Ne. This low-lying negative parity state is consistent with a narrower shell gap for exotic nuclei with ZN and N20. Monte Carlo shell-model calculations with the modern SDPF-M interaction successfully describe neutron-rich nuclei in the vicinity of N=20 where normal and intruder configurations coexist at low excitation energy. This observation demonstrates the importance of direct reactions for the study of exotic nuclei and the predictive power of these large-scale shell-model calculations.

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Acknowledgements

This work is supported by the United States National Science Foundation under contracts PHY-0110253 and PHY-0244453, by the UK Engineering and Physical Sciences Research Council (EPSRC) under Grant No. EP/D003628, by a Grant-in-Aid for Specially Promoted Research (13002001) and a Grant-in-Aid for Young Scientists (14740176) from the MEXT and by the RIKEN-CNS collaboration project on large-scale nuclear structure calculation.

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    1

    Present address: Lawrence Livermore National Laboratory, Livermore, CA 94550, USA.

    2

    Present address: American Science & Engineering, Inc., Billerica, MA 01821, USA.

    3

    Present address: Institut für Kernphysik, Technische Universität Darmstadt, D-64289 Darmstadt, Germany.

    4

    Present address: RIKEN, Hirosawa, Wako-shi, Saitama 351-0198, Japan.

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