First Spectroscopy of the Near Drip-line Nucleus 40Mg

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, S. Paschalis, M. Petri, H. Sakurai, M. Salathe, P. SchrockD. Steppenbeck, S. Takeuchi, Y. K. Tanaka, R. Taniuchi, K. Wimmer, S Chen, R. M. Clark, M. D. Jones, H. Wang

*Corresponding author for this work

Research output: Contribution to journalLetterpeer-review


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.

Original languageEnglish
Article number052501
Number of pages6
JournalPhysical Review Letters
Issue number5
Early online date7 Feb 2019
Publication statusPublished - 8 Feb 2019

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