Observation and spectroscopy of the proton-unbound nucleus <math xmlns="http://www.w3.org/1998/Math/MathML"><mmultiscripts><mi>Al</mi><mprescripts></mprescripts><none></none><mn>21</mn></mmultiscripts></math>

D. Kostyleva; X.-D. Xu; I. Mukha; L. Acosta; M. Bajzek; E. Casarejos; A. A. Ciemny; D. Cortina-Gil; W. Dominik; J. A. Dueñas; J. M. Espino; A. Estradé; F. Farinon; A. Fomichev; H. Geissel; J. Gómez-Camacho; A. Gorshkov; L. V. Grigorenko; Z. Janas; G. Kamiński; O. Kiselev; R. Knöbel; A. A. Korsheninnikov; S. Krupko; M. Kuich; N. Kurz; Yu. A. Litvinov; G. Marquinez-Durán; I. Martel; C. Mazzocchi; E. Yu. Nikolskii; C. Nociforo; A. K. Ordúz; M. Pfützner; S. Pietri; M. Pomorski; A. Prochazka; C. Rodríguez-Tajes; S. Rymzhanova; A. M. Sánchez-Benítez; C. Scheidenberger; H. Simon; B. Sitar; R. Slepnev; M. Stanoiu; P. Strmen; K. Sümmerer; I. Szarka; M. Takechi; Y. K. Tanaka; H. Weick; J. S. Winfield; P. J. Woods; M. V. Zhukov

doi:10.1103/PhysRevC.110.L031301

Editors' Suggestion
Letter

Observation and spectroscopy of the proton-unbound nucleus ${}^{21}{Al}$

D. Kostyleva¹, X.-D. Xu ^2,1,*, I. Mukha¹, L. Acosta^3,4, M. Bajzek^1,5,6, E. Casarejos⁷, A. A. Ciemny⁸, D. Cortina-Gil⁹, W. Dominik⁸ et al.

J. A. Dueñas¹⁰, J. M. Espino¹¹, A. Estradé^12,13, F. Farinon¹, A. Fomichev¹⁴, H. Geissel^1,5,†, J. Gómez-Camacho¹¹, A. Gorshkov¹⁴, L. V. Grigorenko^14,15,16, Z. Janas⁸, G. Kamiński^17,14, O. Kiselev¹, R. Knöbel^1,5, A. A. Korsheninnikov¹⁶, S. Krupko¹⁴, M. Kuich^18,8, N. Kurz¹, Yu. A. Litvinov¹, G. Marquinez-Durán¹⁹, I. Martel²⁰, C. Mazzocchi⁸, E. Yu. Nikolskii^14,16, C. Nociforo¹, A. K. Ordúz²¹, M. Pfützner^8,1, S. Pietri¹, M. Pomorski⁸, A. Prochazka¹, C. Rodríguez-Tajes⁹, S. Rymzhanova¹⁴, A. M. Sánchez-Benítez²², C. Scheidenberger^1,5,23, H. Simon¹, B. Sitar²⁴, R. Slepnev¹⁴, M. Stanoiu²⁵, P. Strmen^24,†, K. Sümmerer¹, I. Szarka²⁴, M. Takechi¹, Y. K. Tanaka^26,1, H. Weick¹, J. S. Winfield^1,†, P. J. Woods¹², and M. V. Zhukov²⁷

¹GSI Helmholtzzentrum für Schwerionenforschung GmbH, 64291 Darmstadt, Germany
²Institute of Modern Physics, Chinese Academy of Science, Lanzhou 730000, China
³Instituto de Estructura de la Materia, CSIC, 28006 Madrid, Spain
⁴Instituto de Física, Universidad Nacional Autónoma de México, A.P. 20-364, Mexico City 01000, Mexico
⁵II. Physikalisches Institut, Justus-Liebig-Universität, 35392 Gießen, Germany
⁶Faculty of Science, University of Zagreb, 10000 Zagreb, Croatia
⁷CINTECX, Universidade de Vigo, E-36310 Vigo, Spain
⁸Faculty of Physics, University of Warsaw, 02-093 Warszawa, Poland
⁹Universidade de Santiago de Compostela, 15782 Santiago de Compostela, Spain
¹⁰Departamento de Ingenieria Electrica y Centro de Estudios Avanzados en Fisica, Matemáticas y Computación, Universidad de Huelva, 21071 Huelva, Spain
¹¹Department of Atomic, Molecular and Nuclear Physics, University of Seville, 41012 Seville, Spain
¹²University of Edinburgh, EH1 1HT Edinburgh, United Kingdom
¹³Central Michigan University, Mt. Pleaseant, Michigan 48859, USA
¹⁴Flerov Laboratory of Nuclear Reactions, JINR, 141980 Dubna, Russia
¹⁵National Research Nuclear University “MEPhI”, 115409 Moscow, Russia
¹⁶National Research Centre “Kurchatov Institute”, Kurchatov Square 1, 123182 Moscow, Russia
¹⁷Heavy Ion Laboratory, University of Warsaw, 02-093 Warszawa, Poland
¹⁸Faculty of Physics, Warsaw University of Technology, 00-662 Warszawa, Poland
¹⁹Department of Applied Physics, University of Huelva, 21071 Huelva, Spain
²⁰University of Huelva, 21007 Huelva, Spain
²¹Grand Accélérateur Nacional d'Ions Lourds–GANIL, 14076 Caen, France
²²Centro de Estudios Avanzados en Física, Matemáticas y Computación (CEAFMC), Department of Integrated Sciences, University of Huelva, 21071 Huelva, Spain
²³Helmholtz Research Academy Hesse for FAIR (HFHF), GSI Helmholtz Center for Heavy Ion Research, Campus Gießen, 35392 Gießen, Germany
²⁴Faculty of Mathematics and Physics, Comenius University, 84248 Bratislava, Slovakia
²⁵IFIN-HH, Post Office Box MG-6, Bucharest, Romania
²⁶University of Tokyo, 113-0033 Tokyo, Japan
²⁷Department of Physics, Chalmers University of Technology, S-41296 Göteborg, Sweden

^*Contact author: xiaodong.xu@impcas.ac.cn
^†Deceased.

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Phys. Rev. C 110, L031301 – Published 3 September, 2024

DOI: https://doi.org/10.1103/PhysRevC.110.L031301

Abstract

We report on the observation of the previously unknown isotope ${}^{21}{Al}$ , the first unbound aluminum isotope located beyond the proton dripline. The ${}^{21}{Al}$ nucleus decays by one-proton ( $1 p$ ) emission, and its in-flight decays were detected by tracking trajectories of the decay products with silicon microstrip detectors. The $1 p$ -emission processes were studied by analyzing the measured angular correlations of decay products ${}^{20}{Mg} + p$ . The $1 p$ -decay energies of the ground and low-lying excited states of ${}^{21}{Al}$ , its mass excess, and the proton separation energy value $S_{p} = - 1 . 15_{- 0.07}^{+ 0.10}$ MeV were determined.

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Observation and spectroscopy of the proton-unbound nucleus Al21

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Observation and spectroscopy of the proton-unbound nucleus ${}^{21}{Al}$