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Extending the Southern Shore of the Island of Inversion to F28

(SAMURAI21) Revel, A.; Sorlin, O.; Marques, 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.; Dombradi, Z.; Douma, C. A.; Elekes, Z.; Fallon, P.; Gasparic, I; Gheller, J-M; Gibelin, J.; Gillibert, A.; Harakeh, M. N.; He, W.; Hirayama, A.; Hoffman, C. R.; Holl, M.; Horvat, A.; Horvath, A.; Hwang, J. W.; Isobe, T.; Kalantar-Nayestanaki, N.; Kawase, S.; Kim, S.; Kisamori, K.; Kobayashi, T.; Koerper, 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.; Santos, F. de Oliveira; 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.; Tornqvist, H.; Togano, Y.; Tomai, T.; Tscheuschner, J.; Tsubota, J.; Uesaka, T.; Yang, Z.; Yasuda, M.; Yoneda, K.; (2020) Extending the Southern Shore of the Island of Inversion to F28. Physical review letters, 124 (15). ISSN 0031-9007

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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.

Item Type: Article
Uncontrolled Keywords: binding energy and masses ; direct reactions ; energy levels and level densities ; models and methods for nuclear reactions ; rare and new isotopes
Subjects: NATURAL SCIENCES > Physics
Divisions: Division of Experimental Physics
Project titleProject leaderProject codeProject type
Zemljovid atomskih jezgara - neutronski bogata stranaSzilner, SuzanaIP-2018-01-1257HRZZ
Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanjaSzilner, SuzanaIP-2013-11-7194HRZZ
Depositing User: Igor Gašparić
Date Deposited: 09 Feb 2022 11:38
DOI: 10.1103/physrevlett.124.152502

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