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. 2020 Apr 17;124(15):152502.
doi: 10.1103/PhysRevLett.124.152502.

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

A Revel  1 , O Sorlin  1 , F M Marqués  2 , Y Kondo  3 , J Kahlbow  4   5 , T Nakamura  3 , N A Orr  2 , F Nowacki  6   7 , J A Tostevin  8 , C X Yuan  9 , N L Achouri  2 , H Al Falou  10 , L Atar  4 , T Aumann  4   11 , H Baba  5 , K Boretzky  11 , C Caesar  4   11 , D Calvet  12 , H Chae  13 , N Chiga  5 , A Corsi  12 , H L Crawford  14 , F Delaunay  2 , A Delbart  12 , Q Deshayes  2 , Z Dombrádi  15 , C A Douma  16 , Z Elekes  15 , P Fallon  14 , I Gašparić  5   17 , J-M Gheller  12 , J Gibelin  2 , A Gillibert  12 , M N Harakeh  11   16 , W He  5 , A Hirayama  3 , C R Hoffman  18 , M Holl  11 , A Horvat  11 , Á Horváth  19 , J W Hwang  20 , T Isobe  5 , N Kalantar-Nayestanaki  16 , S Kawase  21 , S Kim  20 , K Kisamori  5 , T Kobayashi  22 , D Körper  11 , S Koyama  23 , I Kuti  15 , V Lapoux  12 , S Lindberg  24 , S Masuoka  25 , J Mayer  26 , K Miki  27 , T Murakami  28 , M Najafi  16 , K Nakano  21 , N Nakatsuka  28 , T Nilsson  24 , A Obertelli  12 , F de Oliveira Santos  1 , H Otsu  5 , T Ozaki  3 , V Panin  5 , S Paschalis  4 , D Rossi  4 , A T Saito  3 , T Saito  23 , M Sasano  5 , H Sato  5 , Y Satou  20 , H Scheit  4 , F Schindler  4 , P Schrock  25 , M Shikata  3 , Y Shimizu  5 , H Simon  11 , D Sohler  15 , L Stuhl  5 , S Takeuchi  3 , M Tanaka  29 , M Thoennessen  27 , H Törnqvist  4 , Y Togano  3 , T Tomai  3 , J Tscheuschner  4 , J Tsubota  3 , T Uesaka  5 , Z Yang  5 , M Yasuda  3 , K Yoneda  5 ; SAMURAI21 collaboration
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Free article

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

A Revel et al. Phys Rev Lett. .
Free article

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^{(*)}+2n 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 2n 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 1p_{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.

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