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First Spectroscopy of the Near Drip-line Nucleus Mg 40

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Author(s)

  • H. L. Crawford
  • P. Fallon
  • A. O. Macchiavelli
  • P. Doornenbal
  • N. Aoi
  • F. Browne
  • C. M. Campbell
  • M. L. Cortés
  • M. Cromaz
  • E. Ideguchi
  • R. Kanungo
  • M. Maccormick
  • S. Momiyama
  • I. Murray
  • M. Niikura
  • H. Sakurai
  • M. Salathe
  • P. Schrock
  • D. Steppenbeck
  • S. Takeuchi
  • Y. K. Tanaka
  • K. Wimmer

Department/unit(s)

Publication details

JournalPhysical Review Letters
DatePublished - 7 Feb 2019
Issue number5
Volume122
Number of pages6
Original languageEnglish

Abstract

One of the most exotic light neutron-rich nuclei currently accessible for experimental study is Mg40, which lies at the intersection of the nucleon magic number N=28 and the neutron drip line. Low-lying excited states of Mg40 have been studied for the first time following a one-proton removal reaction from Al41, performed at the Radioactive Isotope Beam Factory of RIKEN Nishina Center with the DALI2 γ-ray array and the ZeroDegree spectrometer. Two γ-ray transitions were observed, suggesting an excitation spectrum that shows unexpected properties as compared to both the systematics along the Z=12, N≥20 Mg isotopes and available state-of-the-art theoretical model predictions. A possible explanation for the observed structure involves weak-binding effects in the low-lying excitation spectrum.

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