TY - JOUR
T1 - Magicity versus Superfluidity around O 28 viewed from the Study of F 30
AU - (SAMURAI21-NeuLAND Collaboration)
AU - Kahlbow, J.
AU - Aumann, T.
AU - Sorlin, O.
AU - Kondo, Y.
AU - Nakamura, T.
AU - Nowacki, F.
AU - Revel, A.
AU - Achouri, N. L.
AU - Al Falou, H.
AU - Atar, L.
AU - Baba, H.
AU - Boretzky, K.
AU - Caesar, C.
AU - Calvet, D.
AU - Chae, H.
AU - Chiga, N.
AU - Corsi, A.
AU - Delaunay, F.
AU - Delbart, A.
AU - Deshayes, Q.
AU - Dombrádi, Z.
AU - Douma, C. A.
AU - Elekes, Z.
AU - Gašparić, I.
AU - Gheller, J. M.
AU - Gibelin, J.
AU - Gillibert, A.
AU - Harakeh, M. N.
AU - Hirayama, A.
AU - Holl, M.
AU - Horvat, A.
AU - Horváth,
AU - Hwang, J. W.
AU - Isobe, T.
AU - Kalantar-Nayestanaki, N.
AU - Kawase, S.
AU - Kim, S.
AU - Kisamori, K.
AU - Kobayashi, T.
AU - Körper, D.
AU - Koyama, S.
AU - Kuti, I.
AU - Lapoux, V.
AU - Lindberg, S.
AU - Marqués, F. M.
AU - Masuoka, S.
AU - Mayer, J.
AU - Miki, K.
AU - Murakami, T.
AU - Najafi, M.
N1 - Publisher Copyright:
© 2024 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the "https://creativecommons.org/licenses/by/4.0/"Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.
PY - 2024/8/23
Y1 - 2024/8/23
N2 - The neutron-rich unbound fluorine isotope F2130 has been observed for the first time by measuring its neutron decay at the SAMURAI spectrometer (RIBF, RIKEN) in the quasifree proton knockout reaction of Ne31 nuclei at 235 MeV/nucleon. The mass and thus one-neutron-separation energy of F30 has been determined to be Sn=-472±58(stat)±33(sys) keV from the measurement of its invariant-mass spectrum. The absence of a sharp drop in Sn(F30) shows that the "magic"N=20 shell gap is not restored close to O28, which is in agreement with our shell-model calculations that predict a near degeneracy between the neutron d and fp orbitals, with the 1p3/2 and 1p1/2 orbitals becoming more bound than the 0f7/2 one. This degeneracy and reordering of orbitals has two potential consequences: O28 behaves like a strongly superfluid nucleus with neutron pairs scattering across shells, and both F29,31 appear to be good two-neutron halo-nucleus candidates.
AB - The neutron-rich unbound fluorine isotope F2130 has been observed for the first time by measuring its neutron decay at the SAMURAI spectrometer (RIBF, RIKEN) in the quasifree proton knockout reaction of Ne31 nuclei at 235 MeV/nucleon. The mass and thus one-neutron-separation energy of F30 has been determined to be Sn=-472±58(stat)±33(sys) keV from the measurement of its invariant-mass spectrum. The absence of a sharp drop in Sn(F30) shows that the "magic"N=20 shell gap is not restored close to O28, which is in agreement with our shell-model calculations that predict a near degeneracy between the neutron d and fp orbitals, with the 1p3/2 and 1p1/2 orbitals becoming more bound than the 0f7/2 one. This degeneracy and reordering of orbitals has two potential consequences: O28 behaves like a strongly superfluid nucleus with neutron pairs scattering across shells, and both F29,31 appear to be good two-neutron halo-nucleus candidates.
UR - https://www.scopus.com/pages/publications/85202295507
UR - https://www.scopus.com/pages/publications/85202295507#tab=citedBy
U2 - 10.1103/PhysRevLett.133.082501
DO - 10.1103/PhysRevLett.133.082501
M3 - Article
C2 - 39241734
AN - SCOPUS:85202295507
SN - 0031-9007
VL - 133
JO - Physical Review Letters
JF - Physical Review Letters
IS - 8
M1 - 082501
ER -