First observation of 28O
Artikel i vetenskaplig tidskrift, 2023

Subjecting a physical system to extreme conditions is one of the means often used to obtain a better understanding and deeper insight into its organization and structure. In the case of the atomic nucleus, one such approach is to investigate isotopes that have very different neutron-to-proton (N/Z) ratios than in stable nuclei. Light, neutron-rich isotopes exhibit the most asymmetric N/Z ratios and those lying beyond the limits of binding, which undergo spontaneous neutron emission and exist only as very short-lived resonances (about 10−21s), provide the most stringent tests of modern nuclear-structure theories. Here we report on the first observation of 28O and 27O through their decay into 24O and four and three neutrons, respectively. The 28O nucleus is of particular interest as, with the Z = 8 and N = 20 magic numbers1,2, it is expected in the standard shell-model picture of nuclear structure to be one of a relatively small number of so-called ‘doubly magic’ nuclei. Both 27O and 28O were found to exist as narrow, low-lying resonances and their decay energies are compared here to the results of sophisticated theoretical modelling, including a large-scale shell-model calculation and a newly developed statistical approach. In both cases, the underlying nuclear interactions were derived from effective field theories of quantum chromodynamics. Finally, it is shown that the cross-section for the production of 28O from a 29F beam is consistent with it not exhibiting a closed N = 20 shell structure.

Författare

Y. Kondo

RIKEN

Tokyo Institute of Technology

N. L. Achouri

Normandie Université

H. A. Falou

Universite Libanaise

Université de Technologie et de Sciences Appliquées Libano-Française

L. Atar

Technische Universität Darmstadt

T. Aumann

Helmholtz-Gemeinschaft Deutscher Forschungszentren

Technische Universität Darmstadt

H. Baba

RIKEN

K. Boretzky

Helmholtz-Gemeinschaft Deutscher Forschungszentren

C. Caesar

Helmholtz-Gemeinschaft Deutscher Forschungszentren

Technische Universität Darmstadt

D. Calvet

Université Paris-Saclay

H. Chae

Institute for Basic Science

N. Chiga

RIKEN

A. Corsi

Université Paris-Saclay

F. Delaunay

Normandie Université

A. Delbart

Université Paris-Saclay

Q. Deshayes

Normandie Université

Zs Dombrádi

Magyar Tudomanyos Akademia

C. A. Douma

Rijksuniversiteit Groningen

Andreas Ekström

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

Z. Elekes

Magyar Tudomanyos Akademia

Christian Forssén

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

I. Gasparic

Ruder Boskovic Institute

Technische Universität Darmstadt

RIKEN

J. M. Gheller

Université Paris-Saclay

J. Gibelin

Normandie Université

A. Gillibert

Université Paris-Saclay

G. Hagen

University of Tennessee

Oak Ridge National Laboratory

M. N. Harakeh

Rijksuniversiteit Groningen

Helmholtz-Gemeinschaft Deutscher Forschungszentren

A. Hirayama

Tokyo Institute of Technology

C. R. Hoffman

Argonne National Laboratory

M. Holl

Technische Universität Darmstadt

Helmholtz-Gemeinschaft Deutscher Forschungszentren

A. Horvat

Helmholtz-Gemeinschaft Deutscher Forschungszentren

Horváth

Eötvös Loránd University (ELTE)

J. W. Hwang

Seoul National University

Institute for Basic Science

T. Isobe

RIKEN

Weiguang Jiang

Chalmers, Fysik, Subatomär, högenergi- och plasmafysik

J. Kahlbow

RIKEN

Technische Universität Darmstadt

N. Kalantar-Nayestanaki

Rijksuniversiteit Groningen

S. Kawase

Kyushu University

S. Kim

Seoul National University

Institute for Basic Science

K. Kisamori

RIKEN

T. Kobayashi

Tohoku University

D. Körper

Helmholtz-Gemeinschaft Deutscher Forschungszentren

S. Koyama

University of Tokyo

I. Kuti

Magyar Tudomanyos Akademia

V. Lapoux

Université Paris-Saclay

Simon Lindberg

Chalmers, Fysik, Subatomär fysik och plasmafysik

F. M. Marqués

Normandie Université

S. Masuoka

University of Tokyo

J. Mayer

Universität zu Köln

K. Miki

Tohoku University

T. Murakami

Kyoto University

M. A. Najafi

Rijksuniversiteit Groningen

T. Nakamura

RIKEN

Tokyo Institute of Technology

K. Nakano

Kyushu University

N. Nakatsuka

Kyoto University

Thomas Nilsson

Chalmers, Fysik

A. Obertelli

Université Paris-Saclay

K. Ogata

Osaka University

Kyushu University

Osaka Metropolitan University

F. De Oliveira-Santos

Grand Accélérateur National d'Ions Lourds (GANIL)

N. A. Orr

Normandie Université

H. Otsu

RIKEN

T. Otsuka

University of Tokyo

RIKEN

T. Ozaki

Tokyo Institute of Technology

V. Panin

RIKEN

T. Papenbrock

University of Tennessee

Oak Ridge National Laboratory

S. Paschalis

Technische Universität Darmstadt

A. Revel

Normandie Université

Grand Accélérateur National d'Ions Lourds (GANIL)

D. Rossi

Technische Universität Darmstadt

A. T. Saito

Tokyo Institute of Technology

T. Y. 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

N. Shimizu

University of Tsukuba

Y. Shimizu

RIKEN

H. Simon

Helmholtz-Gemeinschaft Deutscher Forschungszentren

D. Sohler

Magyar Tudomanyos Akademia

Olivier Sorlin

Grand Accélérateur National d'Ions Lourds (GANIL)

L. Stuhl

RIKEN

Institute for Basic Science

Z. H. Sun

Oak Ridge National Laboratory

University of Tennessee

S. Takeuchi

Tokyo Institute of Technology

M. Tanaka

Osaka University

M. Thoennessen

Michigan State University

Hans Törnqvist

Helmholtz-Gemeinschaft Deutscher Forschungszentren

Technische Universität Darmstadt

Y. Togano

Rikkyo University

Tokyo Institute of Technology

T. Tomai

Tokyo Institute of Technology

J. Tscheuschner

Technische Universität Darmstadt

J. Tsubota

Tokyo Institute of Technology

N. Tsunoda

University of Tokyo

T. Uesaka

RIKEN

Y. Utsuno

Japan Atomic Energy Agency

I. Vernon

Durham University

H. Wang

RIKEN

Z. Yang

RIKEN

M. Yasuda

Tokyo Institute of Technology

K. Yoneda

RIKEN

S. Yoshida

Utsunomiya University

Nature

0028-0836 (ISSN) 1476-4687 (eISSN)

Vol. 620 7976 965-970

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Ämneskategorier (SSIF 2011)

Subatomär fysik

Astronomi, astrofysik och kosmologi

DOI

10.1038/s41586-023-06352-6

PubMed

37648757

Mer information

Senast uppdaterat

2025-04-03