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Extending the Southern Shore of the Island of Inversion to 28F

Revel, A., Sorlin, O., Marques, F.M, Kondo, Y., Kahlbow, J., Nakamura, T., Orr, N.A, Nowacki, F., Tostevin, Jeffrey, 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., Korper, 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 Oliviera 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., Thoennsen, M., Tornqvist, H., Togano, Y., Tomai, T., Tscheuschner, J., Tsubota, J., Uesaka, T., Yang, Z., Yasuda, M. and Yoneda, K. (2020) Extending the Southern Shore of the Island of Inversion to 28F Physical Review Letters, 124 (15).

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Abstract

Detailed spectroscopy of the neutron-unbound nucleus 28 F has been performed for the first time following proton/neutron removal from 29 Ne / 29 F beams at energies around 230 MeV / nucleon . The invariant-mass spectra were reconstructed for both the 27 F ( * ) + n and 26 F ( * ) + 2 n coincidences and revealed a series of well-defined resonances. A near-threshold state was observed in both reactions and is identified as the 28 F ground state, with S n ( 28 F ) = − 199 ( 6 )     keV , while analysis of the 2 n decay channel allowed a considerably improved S n ( 27 F ) = 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 28 F . Importantly, in the case of the ground state, the reconstructed 27 F + n momentum distribution following neutron removal from 29 F indicates that it arises mainly from the 1 p 3 / 2 neutron intruder configuration. This demonstrates that the island of inversion around N = 20 includes 28 F , and most probably 29 F , and suggests that 28 O is not doubly magic.

Item Type: Article
Divisions : Faculty of Engineering and Physical Sciences > Physics
Authors :
NameEmailORCID
Revel, A.
Sorlin, O.
Marques, F.M
Kondo, Y.
Kahlbow, J.
Nakamura, T.
Orr, N.A
Nowacki, F.
Tostevin, JeffreyJ.Tostevin@surrey.ac.uk
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.
Korper, 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 Oliviera 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.
Thoennsen, M.
Tornqvist, H.
Togano, Y.
Tomai, T.
Tscheuschner, J.
Tsubota, J.
Uesaka, T.
Yang, Z.
Yasuda, M.
Yoneda, K.
Date : 17 April 2020
DOI : 10.1103/PhysRevLett.124.152502
Copyright Disclaimer : © 2020 American Physical Society
Uncontrolled Keywords : Binding energy & masses; Direct reactions; Energy levels & level densities; Models & methods for nuclear reactions; Rare & new isotopes
Additional Information : Corrected 14 May 2020
Depositing User : James Marshall
Date Deposited : 07 Apr 2020 13:54
Last Modified : 20 May 2020 16:36
URI: http://epubs.surrey.ac.uk/id/eprint/854133

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