Observation and spectroscopy of proton-unbound nucleus $^{21}$Al
D. Kostyleva, X.-D. Xu, I. Mukha, L. Acosta, M. Bajzek, E. Casarejos,, A.A. Ciemny, D. Cortina-Gil, 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
TL;DR
This paper reports the discovery of the unbound isotope $^{21}$Al, its decay properties, and measurements of its decay energies and proton separation energy, expanding knowledge of proton-rich nuclei beyond the dripline.
Contribution
First observation and spectroscopic analysis of the unbound isotope $^{21}$Al beyond the proton dripline, including decay energy and separation energy measurements.
Findings
$^{21}$Al is an unbound isotope decaying via one-proton emission.
Measured proton-decay energy and separation energy of $^{21}$Al.
Determined the mass excess and low-lying states of $^{21}$Al.
Abstract
We report on the observation of previously-unknown isotope Al, the first unbound aluminum isotope located beyond the proton dripline. The 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 Mg+p. The 1p-decay energies of ground and low-lying excited states of Al, its mass excess and proton separation energy value = MeV were determined.
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Taxonomy
TopicsNuclear physics research studies · Atomic and Molecular Physics · Particle accelerators and beam dynamics