First Spectroscopy of the Near Drip-line Nucleus [superscript 40]Mg

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

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First Spectroscopy of the Near Drip-line Nucleus [superscript 40]Mg

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

Date: 2019-02-08

Type: Text

ISSN: 1079-7114
0031-9007

Source:

Physical Review Letters 122(5), 052501. (2019)

Abstract:

One of the most exotic light neutron-rich nuclei currently accessible for experimental study is ⁴⁰Mg, which lies at the intersection of the nucleon magic number N=28 and the neutron drip line. Low-lying excited states of ⁴⁰Mg have been studied for the first time following a one-proton removal reaction from ⁴¹Al, performed at the RIBF RIKEN with the DALI2 γ-ray array and the Zero-Degree 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.