Magicity versus Superfluidity around28Oviewed from the Study of30F

(SAMURAI21-NeuLAND Collaboration) Kahlbow, J; Aumann, T; Sorlin, O; Kondo, Y; Nakamura, T; Nowacki, F; Revel, A; Achouri, NL; Al Falou, H; Atar, L; Baba, H; Boretzky, K; Caesar, C; Calvet, D; Chae, H; Chiga, N; Corsi, A; Delaunay, F; Delbart, A; Deshayes, Q; Dombrádi, Z; Douma, CA; Elekes, Z; Gasparic, I; Gheller, JM; Gibelin, J; Gillibert, A; Harakeh, MN; Hirayama, A; Holl, M; Horvat, A; Horváth, A; Hwang, JW; Isobe, T; Kalantar-Nayestanaki, N; Kawase, S; Kim, S; Kisamori, K; Kobayashi, T; Körper, D; Koyama, S; Kuti, I; Lapoux, V; Lindberg, S; Marqués, FM; Masuoka, S; Mayer, J; Miki, K; Murakami, T; Najafi, M; Nakano, K; Nakatsuka, N; Nilsson, T; Obertelli, A; Orr, NA; Otsu, H; Ozaki, T; Panin, V; Paschalis, S; Rossi, DM; Saito, AT; Saito, T; Sasano, M; Sato, H; Satou, Y; Scheit, H; Schindler, F; Schrock, P; Shikata, M; Shimada, K; 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; Wang, H; Yang, Z; Yasuda, M; Yoneda, K (2024) Magicity versus Superfluidity around28Oviewed from the Study of30F. Physical Review Letters, 133 (8). ISSN 0031-9007

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Abstract

The neutron-rich unbound fluorine isotope30F21has been observed for the first time by measuring itsneutron decay at the SAMURAI spectrometer (RIBF, RIKEN) in the quasifree proton knockout reactionof31Ne nuclei at235MeV=nucleon. The mass and thus one-neutron-separation energy of30F has been determined to beSn 1/4 -47258 & eth;stat & THORN;33 & eth;sys & THORN;keV from the measurement of its invariant-massspectrum. The absence of a sharp drop inSn & eth;30F & THORN;shows that the"magic"N 1/4 20shell gap is not restoredclose to28O, which is in agreement with our shell-model calculations that predict a near degeneracybetween the neutrondandfporbitals, with the1p3=2and1p1=2orbitals becoming more bound than the0f7=2one. This degeneracy and reordering of orbitals has two potential consequences:28O behaves like astrongly superfluid nucleus with neutron pairs scattering across shells, and both29;31F appear to be goodtwo-neutron halo-nucleus candidates

Item Type:	Article
Uncontrolled Keywords:	nuclear structure; shell model; direct reactions; relativistic radioactive beams
Subjects:	NATURAL SCIENCES > Physics > Nuclear Physics
Divisions:	Division of Experimental Physics
Projects:	Project title Project leader Project code Project type Nuklearna struktura i reakcije: eksperimentima prema neutronskoj liniji kapanja-SR-ETNo Suzana Szilner IP-2013-11-7194 HRZZ Zemljovid atomskih jezgara - neutronski bogata strana-NeRiS-Land Suzana Szilner IP-2018-01-1257 HRZZ
Depositing User:	Ema Buhin Šaler
Date Deposited:	21 Apr 2026 13:48
URI:	https://fulir.irb.hr:/id/eprint/11774
DOI:	10.1103/PhysRevLett.133.082501

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