@article{d27ddb2622814e2ea5c4876b659ada8b,
title = "Extending the Southern Shore of the Island of Inversion to F 28",
abstract = "Detailed spectroscopy of the neutron-unbound nucleus F28 has been performed for the first time following proton/neutron removal from Ne29/F29 beams at energies around 230 MeV/nucleon. The invariant-mass spectra were reconstructed for both the F(∗)27+n and F(∗)26+2n coincidences and revealed a series of well-defined resonances. A near-threshold state was observed in both reactions and is identified as the F28 ground state, with Sn(F28)=-199(6) keV, while analysis of the 2n decay channel allowed a considerably improved Sn(F27)=1620(60) keV to be deduced. Comparison with shell-model predictions and eikonal-model reaction calculations have allowed spin-parity assignments to be proposed for some of the lower-lying levels of F28. Importantly, in the case of the ground state, the reconstructed F27+n momentum distribution following neutron removal from F29 indicates that it arises mainly from the 1p3/2 neutron intruder configuration. This demonstrates that the island of inversion around N=20 includes F28, and most probably F29, and suggests that O28 is not doubly magic.",
author = "{(SAMURAI21 collaboration)} and A. Revel and O. Sorlin and Marqu{\'e}s, {F. M.} and Y. Kondo and J. Kahlbow and T. Nakamura and Orr, {N. A.} and F. Nowacki and Tostevin, {J. A.} and Yuan, {C. X.} and Achouri, {N. L.} and {Al Falou}, H. and L. Atar and T. Aumann and H. Baba and K. Boretzky and C. Caesar and D. Calvet and H. Chae and N. Chiga and A. Corsi and Crawford, {H. L.} and F. Delaunay and A. Delbart and Q. Deshayes and Z. Dombr{\'a}di and Douma, {C. A.} and Z. Elekes and P. Fallon and I. Ga{\v s}pari{\'c} and Gheller, {J. M.} and J. Gibelin and A. Gillibert and Harakeh, {M. N.} and W. He and A. Hirayama and Hoffman, {C. R.} and M. Holl and A. Horvat and Horv{\'a}th and Hwang, {J. W.} and T. Isobe and N. Kalantar-Nayestanaki and S. Kawase and S. Kim and K. Kisamori and T. Kobayashi and D. K{\"o}rper and S. Koyama and I. Kuti",
note = "Funding Information: We thank M. Ploszajczak for fruitful discussions, and the accelerator staff of the RIKEN Nishina Center for their efforts in delivering the intense beam. N. L. A., F. D., J. G., F. M. M., and N. A. O. acknowledge partial support from the Franco-Japanese LIA-International Associated Laboratory for Nuclear Structure Problems as well as the French ANR-14-CE33-0022-02 EXPAND. J. A. T. acknowledges support from the Science and Technology Facilities Council (U.K.) Grant No. ST/L005743/1. I. G. was supported by Helmholtz International Center for FAIR and Croatian Science Foundation under Projects No. 1257 and No. 7194. Z. D., Z. E., and D. S. were supported by Projects No. Gazdas{\'a}gfejleszt{\'e}si {\'e}s Innov{\'a}ci{\'o}s Operat{\'i}v Program-2.3.3-15-2016-00034 and No. K128947, and I. K. by Project No. PD 124717. J. K. acknowledges support from RIKEN as short-term International Program Associate. This material is based upon work supported by the U.S. Department of Energy, Office of Science, Office of Nuclear Physics, under Contract No. DE-AC02-06CH11357 (ANL). This project was funded in part by the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation), Project-ID 279384907, SFB 1245, and the GSI-TU Darmstadt cooperation agreement. Publisher Copyright: {\textcopyright} 2020 American Physical Society. {\textcopyright} 2020 American Physical Society.",
year = "2020",
month = apr,
day = "17",
doi = "10.1103/PhysRevLett.124.152502",
language = "English",
volume = "124",
journal = "Physical Review Letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "15",
}