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arxiv: 2406.04771 · v1 · pith:DXZAMV2Wnew · submitted 2024-06-07 · ⚛️ nucl-ex

Observation and spectroscopy of proton-unbound nucleus ²¹Al

D. Kostyleva , X.-D. Xu , I. Mukha , L. Acosta , M. Bajzek , E. Casarejos , A.A. Ciemny , D. Cortina-Gil
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W. Dominik J.A. Due\~nas J. M. Espino A. Estrad\'e F. Farinon A. Fomichev H. Geissel J. G\'omez-Camacho A. Gorshkov L.V. Grigorenko Z. Janas G. Kami\'nski O. Kiselev R. Kn\"obel A.A. Korsheninnikov S. Krupko M. Kuich N. Kurz Yu.A. Litvinov G. Marquinez-Dur\'an I. Martel C. Mazzocchi E.Yu. Nikolskii C. Nociforo A.K. Ord\'uz M. Pf\"utzner S. Pietri M. Pomorski A. Prochazka C. Rodr\'iguez-Tajes S. Rymzhanova A.M. S\'anchez-Ben\'itez C. Scheidenberger H. Simon B. Sitar R. Slepnev M. Stanoiu P. Strmen K. S\"ummerer I. Szarka M. Takechi Y.K. Tanaka H. Weick J.S. Winfield P.J. Woods M.V. Zhukov
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classification ⚛️ nucl-ex
keywords weredecaydecaysisotopenucleusobservationproductsproton
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We report on the observation of previously-unknown isotope $^{21}$Al, the first unbound aluminum isotope located beyond the proton dripline. The $^{21}$Al nucleus decays by one-proton (1p) emission, and its in-flight decays were detected by tracking trajectories of all decay products with micro-strip silicon detectors. The 1p-emission processes were studied by analyses of the measured angular correlations of decay products $^{20}$Mg+p. The 1p-decay energies of ground and low-lying excited states of $^{21}$Al, its mass excess and proton separation energy value $S_p$=$-1.1(1)$ MeV were determined.

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