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

(SAMURAI21 collaboration)

doi:10.1103/PhysRevLett.124.152502

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

(SAMURAI21 collaboration)

Engineering Science for Advanced energy system

Research output: Contribution to journal › Article

1 Citation (Scopus)

Abstract

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.

Original language	English
Article number	152502
Journal	Physical review letters
Volume	124
Issue number	15
DOIs	https://doi.org/10.1103/PhysRevLett.124.152502
Publication status	Published - Apr 17 2020

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1103/PhysRevLett.124.152502

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(SAMURAI21 collaboration) (2020). Extending the Southern Shore of the Island of Inversion to F 28. Physical review letters, 124(15), [152502]. https://doi.org/10.1103/PhysRevLett.124.152502

@article{d27ddb2622814e2ea5c4876b659ada8b,

title = "Extending the Southern Shore of the Island of Inversion to F 28",

abstract = "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.",

author = "{(SAMURAI21 collaboration)} and A. Revel and O. Sorlin and Marqu{\'e}s, {F. M.} and Y. Kondo and J. Kahlbow and T. Nakamura and Orr, {N. A.} and F. Nowacki and Tostevin, {J. A.} and Yuan, {C. X.} and Achouri, {N. L.} and {Al Falou}, H. and L. Atar and T. Aumann and H. Baba and K. Boretzky and C. Caesar and D. Calvet and H. Chae and N. Chiga and A. Corsi and Crawford, {H. L.} and F. Delaunay and A. Delbart and Q. Deshayes and Z. Dombr{\'a}di and Douma, {C. A.} and Z. Elekes and P. Fallon and I. Ga{\v s}pari{\'c} and Gheller, {J. M.} and J. Gibelin and A. Gillibert and Harakeh, {M. N.} and W. He and A. Hirayama and Hoffman, {C. R.} and M. Holl and A. Horvat and Horv{\'a}th and Hwang, {J. W.} and T. Isobe and N. Kalantar-Nayestanaki and S. Kawase and S. Kim and K. Kisamori and T. Kobayashi and D. K{\"o}rper and S. Koyama and I. Kuti",

year = "2020",

month = apr,

day = "17",

doi = "10.1103/PhysRevLett.124.152502",

language = "English",

volume = "124",

journal = "Physical Review Letters",

issn = "0031-9007",

publisher = "American Physical Society",

number = "15",

}

TY - JOUR

T1 - Extending the Southern Shore of the Island of Inversion to F 28

AU - (SAMURAI21 collaboration)

AU - Revel, A.

AU - Sorlin, O.

AU - Marqués, F. M.

AU - Kondo, Y.

AU - Kahlbow, J.

AU - Nakamura, T.

AU - Orr, N. A.

AU - Nowacki, F.

AU - Tostevin, J. A.

AU - Yuan, C. X.

AU - Achouri, N. L.

AU - Al Falou, H.

AU - Atar, L.

AU - Aumann, T.

AU - Baba, H.

AU - Boretzky, K.

AU - Caesar, C.

AU - Calvet, D.

AU - Chae, H.

AU - Chiga, N.

AU - Corsi, A.

AU - Crawford, H. L.

AU - Delaunay, F.

AU - Delbart, A.

AU - Deshayes, Q.

AU - Dombrádi, Z.

AU - Douma, C. A.

AU - Elekes, Z.

AU - Fallon, P.

AU - Gašparić, I.

AU - Gheller, J. M.

AU - Gibelin, J.

AU - Gillibert, A.

AU - Harakeh, M. N.

AU - He, W.

AU - Hirayama, A.

AU - Hoffman, C. R.

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.

PY - 2020/4/17

Y1 - 2020/4/17

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevLett.124.152502

DO - 10.1103/PhysRevLett.124.152502

M3 - Article

C2 - 32357034

AN - SCOPUS:85084668492

VL - 124

JO - Physical Review Letters

JF - Physical Review Letters

SN - 0031-9007

IS - 15

M1 - 152502

ER -