Observation and spectroscopy of the proton-unbound nucleus 21Al
Journal article, 2024

We report on the observation of the previously unknown isotope Al-21, the first unbound aluminum isotope located beyond the proton dripline. The Al-21 nucleus decays by one-proton (1p) emission, and its in-flight decays were detected by tracking trajectories of the decay products with silicon microstrip detectors. The 1p-emission processes were studied by analyzing the measured angular correlations of decay products Mg-20+p. The 1p-decay energies of the ground and low-lying excited states of Al-21, its mass excess, and the proton separation energy value S-p=-1.15(-0.07)(+0.10) MeV were determined.

Author

D. Kostyleva

Helmholtz Association of German Research Centres

X. -D. Xu

Chinese Academy of Sciences

Helmholtz Association of German Research Centres

I. Mukha

Helmholtz Association of German Research Centres

L. Acosta

Spanish National Research Council (CSIC)

Universidad Nacional Autónoma de México

M. Bajzek

Justus Liebig University Giessen

University of Zagreb

Helmholtz Association of German Research Centres

E. Casarejos

University of Vigo

A. A. Ciemny

University of Warsaw

D. Cortina-Gil

Universidade de Santiagode Compostela

W. Dominik

University of Warsaw

J. A. Duenas

University of Huelva

J. M. Espino

University of Seville

A. Estrade

University of Edinburgh

Central Michigan University

F. Farinon

Helmholtz Association of German Research Centres

A. Fomichev

Joint Institute for Nuclear Research (JINR)

H. Geissel

Helmholtz Association of German Research Centres

Justus Liebig University Giessen

J. Gomez-Camacho

University of Seville

A. Gorshkov

Joint Institute for Nuclear Research (JINR)

L. V. Grigorenko

National Research Nuclear University

Joint Institute for Nuclear Research (JINR)

National Research Centre "Kurchatov Institute"

Z. Janas

University of Warsaw

G. Kaminski

Joint Institute for Nuclear Research (JINR)

University of Warsaw

O. Kiselev

Helmholtz Association of German Research Centres

R. Knoebel

Justus Liebig University Giessen

Helmholtz Association of German Research Centres

A. A. Korsheninnikov

National Research Centre "Kurchatov Institute"

S. Krupko

Joint Institute for Nuclear Research (JINR)

M. Kuich

University of Warsaw

Warsaw University of Technology

N. Kurz

Helmholtz Association of German Research Centres

Yu. A. Litvinov

Helmholtz Association of German Research Centres

G. Marquinez-Duran

University of Huelva

I. Martel

University of Huelva

C. Mazzocchi

University of Warsaw

E. Yu. Nikolskii

National Research Centre "Kurchatov Institute"

Joint Institute for Nuclear Research (JINR)

C. Nociforo

Helmholtz Association of German Research Centres

A. K. Orduz

Grand Accelerateur Nacl Ions Lourds GANIL

M. Pfuetzner

University of Warsaw

Helmholtz Association of German Research Centres

S. Pietri

Helmholtz Association of German Research Centres

M. Pomorski

University of Warsaw

A. Prochazka

Helmholtz Association of German Research Centres

C. Rodriguez-Tajes

Universidade de Santiagode Compostela

S. Rymzhanova

Joint Institute for Nuclear Research (JINR)

A. M. Sanchez-Benitez

University of Huelva

C. Scheidenberger

Helmholtz Association of German Research Centres

H. Simon

Helmholtz Association of German Research Centres

B. Sitar

Comenius University in Bratislava

R. Slepnev

Joint Institute for Nuclear Research (JINR)

M. Stanoiu

IFIN HH

P. Strmen

Comenius University in Bratislava

K. Suemmerer

Helmholtz Association of German Research Centres

I. Szarka

Comenius University in Bratislava

M. Takechi

Helmholtz Association of German Research Centres

Y. K. Tanaka

University of Tokyo

Helmholtz Association of German Research Centres

H. Weick

Helmholtz Association of German Research Centres

J. S. Winfield

Helmholtz Association of German Research Centres

P. J. Woods

University of Edinburgh

Mikhail Zhukov

Chalmers, Physics

Physical Review C

24699985 (ISSN) 24699993 (eISSN)

Vol. 110 3 L031301

Subject Categories (SSIF 2011)

Subatomic Physics

DOI

10.1103/PhysRevC.110.L031301

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