Extending the Southern Shore of the Island of Inversion to F-28
Artikel i vetenskaplig tidskrift, 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.

Författare

A. Revel

CEA DRF CNRS IN2P3

O. Sorlin

CEA DRF CNRS IN2P3

F. M. Marques

Université de Caen Normandie

Y. Kondo

Tokyo Institute of Technology

J. Kahlbow

RIKEN

Technische Universität Darmstadt

T. Nakamura

Tokyo Institute of Technology

N. A. Orr

Université de Caen Normandie

F. Nowacki

Université de Strasbourg

Centre national de la recherche scientifique (CNRS)

J. A. Tostevin

University of Surrey

C. X. Yuan

Sun Yat-Sen University

N. L. Achouri

Université de Caen Normandie

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

Université Paris-Saclay

H. Chae

Inst for Basic Sci Korea

N. Chiga

RIKEN

A. Corsi

Université Paris-Saclay

H. L. Crawford

Lawrence Berkeley National Laboratory

F. Delaunay

Université de Caen Normandie

A. Delbart

Université Paris-Saclay

Q. Deshayes

Université de Caen Normandie

Z. Dombradi

Inst Nucl Res

C. A. Douma

Rijksuniversiteit Groningen

Z. Elekes

Inst Nucl Res

P. Fallon

Lawrence Berkeley National Laboratory

I Gasparic

Rudjer Boskovic Inst

RIKEN

J-M Gheller

Université Paris-Saclay

J. Gibelin

Université de Caen Normandie

A. Gillibert

Université Paris-Saclay

M. N. Harakeh

Rijksuniversiteit 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

Rijksuniversiteit 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

Université Paris-Saclay

Simon Lindberg

Chalmers, Fysik, Subatomär fysik och plasmafysik

S. Masuoka

University of Tokyo

J. Mayer

Universität zu Köln

K. Miki

Michigan State University

T. Murakami

Kyoto University

M. Najafi

Rijksuniversiteit Groningen

K. Nakano

Kyushu University

N. Nakatsuka

Kyoto University

Thomas Nilsson

Chalmers, Fysik

A. Obertelli

Université Paris-Saclay

F. de Oliveira Santos

CEA DRF CNRS IN2P3

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 152502

Ämneskategorier

Subatomär fysik

DOI

10.1103/PhysRevLett.124.152502

PubMed

32357034

Mer information

Senast uppdaterat

2020-09-15