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Open Access Publications from the University of California

First Spectroscopy of the Near Drip-line Nucleus ^{40}Mg.

  • Author(s): Crawford, HL
  • Fallon, P
  • Macchiavelli, AO
  • Doornenbal, P
  • Aoi, N
  • Browne, F
  • Campbell, CM
  • Chen, S
  • Clark, RM
  • Cortés, ML
  • Cromaz, M
  • Ideguchi, E
  • Jones, MD
  • Kanungo, R
  • MacCormick, M
  • Momiyama, S
  • Murray, I
  • Niikura, M
  • Paschalis, S
  • Petri, M
  • Sakurai, H
  • Salathe, M
  • Schrock, P
  • Steppenbeck, D
  • Takeuchi, S
  • Tanaka, YK
  • Taniuchi, R
  • Wang, H
  • Wimmer, K
  • et al.

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One of the most exotic light neutron-rich nuclei currently accessible for experimental study is ^{40}Mg, which lies at the intersection of the nucleon magic number N=28 and the neutron drip line. Low-lying excited states of ^{40}Mg have been studied for the first time following a one-proton removal reaction from ^{41}Al, 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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