Extending the Southern Shore of the Island of Inversion to F28

Revel, A.; Sorlin, O.; Marqués, F. M.; Kondo, Y.; Kahlbow, J.; Nakamura, T.; Orr, N. A.; Nowacki, F.; Tostevin, J. A.; Yuan, C. X.; Achouri, N. L.; Al Falou, H.; Atar, L.; Aumann, T.; Baba, H.; Boretzky, K.; Caesar, C.; Calvet, D.; Chae, H.; Chiga, N.; Corsi, A.; Crawford, H. L.; Delaunay, F.; Delbart, A.; Deshayes, Q.; Dombrádi, Z.; Douma, C. A.; Elekes, Z.; Fallon, P.; Gašparić, I.; Gheller, J. -M.; Gibelin, J.; Gillibert, A.; Harakeh, M. N.; He, W.; Hirayama, A.; Hoffman, C. R.; Holl, M.; Horvat, A.; Horváth, Á.; Hwang, J. W.; Isobe, T.; Kalantar-Nayestanaki, N.; Kawase, S.; Kim, S.; Kisamori, K.; Kobayashi, T.; Körper, D.; Koyama, S.; Kuti, I.; Lapoux, V.; Lindberg, S.; Masuoka, S.; Mayer, J.; Miki, K.; Murakami, T.; Najafi, M.; Nakano, K.; Nakatsuka, N.; Nilsson, T.; Obertelli, A.; de Oliveira Santos, F.; Otsu, H.; Ozaki, T.; Panin, V.; Paschalis, S.; Rossi, D.; Saito, A. T.; Saito, T.; Sasano, M.; Sato, H.; Satou, Y.; Scheit, H.; Schindler, F.; Schrock, P.; Shikata, M.; Shimizu, Y.; Simon, H.; Sohler, D.; Stuhl, L.; Takeuchi, S.; Tanaka, M.; Thoennessen, M.; Törnqvist, H.; Togano, Y.; Tomai, T.; Tscheuschner, J.; Tsubota, J.; Uesaka, T.; Yang, Z.; Yasuda, M.; Yoneda, K.

doi:10.1103/PhysRevLett.124.152502

Extending the Southern Shore of the Island of Inversion to ${}^{28}F$

Journal Article · Thu Apr 16 00:00:00 EDT 2020 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.124.152502· OSTI ID:1630826

Revel, A.; Sorlin, O.; ; Kondo, Y.; Kahlbow, J.; Nakamura, T.; Orr, N. A.; Nowacki, F.; Tostevin, J. A.; Yuan, C. X.; Achouri, N. L.; Al Falou, H.; Atar, L.; Aumann, T.; Baba, H.; Boretzky, K.; Caesar, C.; Calvet, D.; Chae, H.; Chiga, N. more »

Detailed spectroscopy of the neutron-unbound nucleus ²⁸F has been performed for the first time following proton/neutron removal from ²⁹Ne/²⁹F beams at energies around 230 MeV / nucleon . The invariant-mass spectra were reconstructed for both the ²⁷F(*) + n and ²⁶F(*) + 2n coincidences and revealed a series of well-defined resonances. A near-threshold state was observed in both reactions and is identified as the ²⁸F ground state, with S_n(²⁸F) = -199(6) keV, while analysis of the 2n decay channel allowed a considerably improved S_n(²⁷F) = 162(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 ²⁸F. Importantly, in the case of the ground state, the reconstructed ²⁷F + n momentum distribution following neutron removal from ²⁹F indicates that it arises mainly from the 1p_3/2 neutron intruder configuration. Finally, this demonstrates that the island of inversion around N = 20 includes ²⁸F, and most probably ²⁹F, and suggests that ²⁸O is not doubly magic.

View Accepted Manuscript (DOE)

Research Organization:: Argonne National Laboratory (ANL), Argonne, IL (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: Croatian Science Foundation; Deutsche Forschungsgemeinschaft (DFG); RIKEN Nishina Center; USDOE Office of Science (SC), Nuclear Physics (NP); USDOE Office of Science (SC), Nuclear Physics (NP) (SC-26); United Kingdom Science and Technology Facilities Council

Contributing Organization:: SAMURAI21 collaboration

Grant/Contract Number:: AC02-06CH11357

OSTI ID:: 1630826

Alternate ID(s):: OSTI ID: 1615113
OSTI ID: 1650086

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 15 Vol. 124; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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