Extending the Southern Shore of the Island of Inversion to F-28
Journal article, 2020
Detailed spectroscopy of the neutron-unbound nucleus F-28 has been performed for the first time following proton/neutron removal from Ne-29/F-29 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 F-28 ground state, with S-n(F-28) = -199(6) keV, while analysis of the 2n decay channel allowed a considerably improved S-n(F-27) = 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 F-28. Importantly, in the case of the ground state, the reconstructed F-27 + n momentum distribution following neutron removal from F-29 indicates that it arises mainly from the 1p(3/2) neutron intruder configuration. This demonstrates that the island of inversion around N = 20 includes F-28, and most probably F-29, and suggests that O-28 is not doubly magic.
Author
A. Revel
IN2P3 Institut National de Physique Nucleaire et de Physique des Particules
O. Sorlin
IN2P3 Institut National de Physique Nucleaire et de Physique des Particules
F. M. Marques
Normandie University
Y. Kondo
Tokyo Institute of Technology
J. Kahlbow
Technische Universität Darmstadt
RIKEN
T. Nakamura
Tokyo Institute of Technology
N. A. Orr
Normandie University
F. Nowacki
University of Strasbourg
Centre national de la recherche scientifique (CNRS)
J. A. Tostevin
University of Surrey
C. X. Yuan
Sun Yat-Sen University
N. L. Achouri
Normandie University
H. Al Falou
Lebanese American University
L. Atar
Technische Universität Darmstadt
T. Aumann
Technische Universität Darmstadt
Helmholtz
H. Baba
RIKEN
K. Boretzky
Helmholtz
C. Caesar
Helmholtz
Technische Universität Darmstadt
D. Calvet
University Paris-Saclay
H. Chae
Institute for Basic Science - Korea (IBS)
N. Chiga
RIKEN
A. Corsi
University Paris-Saclay
H. L. Crawford
Lawrence Berkeley National Laboratory
F. Delaunay
Normandie University
A. Delbart
University Paris-Saclay
Q. Deshayes
Normandie University
Z. Dombradi
Inst Nucl Res
C. A. Douma
University of Groningen
Z. Elekes
Inst Nucl Res
P. Fallon
Lawrence Berkeley National Laboratory
I Gasparic
RIKEN
Ruder Boskovic Institute
J-M Gheller
University Paris-Saclay
J. Gibelin
Normandie University
A. Gillibert
University Paris-Saclay
M. N. Harakeh
University of Groningen
Helmholtz
W. He
RIKEN
A. Hirayama
Tokyo Institute of Technology
C. R. Hoffman
Argonne National Laboratory
M. Holl
Helmholtz
A. Horvat
Helmholtz
A. Horvath
Eötvös Loránd University (ELTE)
J. W. Hwang
Seoul National University
T. Isobe
RIKEN
N. Kalantar-Nayestanaki
University of Groningen
S. Kawase
Kyushu University
S. Kim
Seoul National University
K. Kisamori
RIKEN
T. Kobayashi
Tohoku University
D. Koerper
Helmholtz
S. Koyama
University of Tokyo
I Kuti
Inst Nucl Res
V Lapoux
University Paris-Saclay
Simon Lindberg
Chalmers, Physics, Subatomic and Plasma Physics
S. Masuoka
University of Tokyo
J. Mayer
University of Cologne
K. Miki
Michigan State University
T. Murakami
Kyoto University
M. Najafi
University of Groningen
K. Nakano
Kyushu University
N. Nakatsuka
Kyoto University
Thomas Nilsson
Chalmers, Physics
A. Obertelli
University Paris-Saclay
F. de Oliveira Santos
IN2P3 Institut National de Physique Nucleaire et de Physique des Particules
H. Otsu
RIKEN
T. Ozaki
Tokyo Institute of Technology
V Panin
RIKEN
S. Paschalis
Technische Universität Darmstadt
D. Rossi
Technische Universität Darmstadt
A. T. Saito
Tokyo Institute of Technology
T. Saito
University of Tokyo
M. Sasano
RIKEN
H. Sato
RIKEN
Y. Satou
Seoul National University
H. Scheit
Technische Universität Darmstadt
F. Schindler
Technische Universität Darmstadt
P. Schrock
University of Tokyo
M. Shikata
Tokyo Institute of Technology
Y. Shimizu
RIKEN
H. Simon
Helmholtz
D. Sohler
Inst Nucl Res
L. Stuhl
RIKEN
S. Takeuchi
Tokyo Institute of Technology
M. Tanaka
Osaka University
M. Thoennessen
Michigan State University
H. Tornqvist
Technische Universität Darmstadt
Y. Togano
Tokyo Institute of Technology
T. Tomai
Tokyo Institute of Technology
J. Tscheuschner
Technische Universität Darmstadt
J. Tsubota
Tokyo Institute of Technology
T. Uesaka
RIKEN
Z. Yang
RIKEN
M. Yasuda
Tokyo Institute of Technology
K. Yoneda
RIKEN
Physical Review Letters
0031-9007 (ISSN) 1079-7114 (eISSN)
Vol. 124 15 152502Exotiska nukleära system vid gränsen för existens - fysik i frontlinjen med perspektiv mot FAIR
Swedish Research Council (VR) (2017-03839), 2018-01-01 -- 2021-12-31.
Subject Categories
Subatomic Physics
Roots
Basic sciences
DOI
10.1103/PhysRevLett.124.152502
PubMed
32357034