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H. L. Crawford; P. Fallon; A. O. Macchiavelli; P. Doornenbal; N. Aoi; F. Browne; C. M. Campbell; S. Chen; R. M. Clark; M. L. Cortés; M. Cromaz; E. Ideguchi; M. D. Jones; R. Kanungo; M. MacCormick; S. Momiyama; I. Murray; M. Niikura; S. Paschalis; M. Petri; H. Sakurai; M. Salathe; P. Schrock; D. Steppenbeck; S. Takeuchi; Y. K. Tanaka; R. Taniuchi; H. Wang; K. Wimmer

doi:10.1103/PhysRevLett.122.052501

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

H. L. Crawford^1,*, P. Fallon¹, A. O. Macchiavelli¹, P. Doornenbal², N. Aoi³, F. Browne², C. M. Campbell¹, S. Chen², R. M. Clark¹ et al.

M. L. Cortés², M. Cromaz¹, E. Ideguchi³, M. D. Jones^1,†, R. Kanungo^4,5, M. MacCormick⁶, S. Momiyama⁷, I. Murray⁶, M. Niikura⁷, S. Paschalis⁸, M. Petri⁸, H. Sakurai^2,7, M. Salathe¹, P. Schrock⁹, D. Steppenbeck⁹, S. Takeuchi^2,10, Y. K. Tanaka¹¹, R. Taniuchi⁷, H. Wang², and K. Wimmer⁷

¹Nuclear Science Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
²RIKEN Nishina Center, Wako, Saitama 351-0198, Japan
³Research Center for Nuclear Physics (RCNP), Osaka University, Mihogakoa, Ibaraki, Osaka 567-0047, Japan
⁴Astronomy and Physics Department, Saint Mary’s University, Halifax, Nova Scotia B3H 3C3, Canada
⁵TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
⁶Institut de Physique Nucléaire, IN2P3-CNRS, Université Paris-Sud, Université Paris-Saclay, Orsay Cedex 91406, France
⁷Department of Physics, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
⁸Department of Physics, University of York, Heslington, York, England YO10 5DD, United Kingdom
⁹Center for Nuclear Study, University of Tokyo, RIKEN Campus, Wako, Saitama 351-0198, Japan
¹⁰Department of Physics, Tokyo Institute of Technology, Meguro, Tokyo 152-8551, Japan
¹¹GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstrasse 1, 64291 Darmstadt, Germany

^*Corresponding author. hlcrawford@lbl.gov
^†Present address: Department of Physics and Astronomy, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27559-3255, USA.

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Phys. Rev. Lett. 122, 052501 – Published 7 February, 2019

DOI: https://doi.org/10.1103/PhysRevLett.122.052501

Abstract

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 $Z = 12$ , $N \geq 20 Mg$ 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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First Spectroscopy of the Near Drip-line Nucleus ${}^{40}{Mg}$

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First Spectroscopy of the Near Drip-line Nucleus Mg40

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