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Mirror Symmetry Breaking Disclosed in the Decay of Three-Proton Emitter 20Al

Fuente: arXiv
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Bibliographic Details
Main Authors: Xu, X. -D., Mukha, I., Li, J. G., Wang, S. M., Acosta, L., Bajzek, M., Casarejos, E., Cortina-Gil, D., Espino, J. M., Fomichev, A., Geissel, H., Gomez-Camacho, J., Grigorenko, L. V., Kiselev, O., Korsheninnikov, A. A., Kostyleva, D., Kurz, N., Litvinov, Yu. A., Martel, I., Nociforo, C., Pfutzner, M., Rodrıguez-Tajes, C., Scheidenberger, C., Stanoiu, M., Suemmerer, K., Weick, H., Woods, P. J., Zhukov, M. V.
Format: Preprint
Published: 2024
Subjects:
Nuclear Experiment
Online Access:
Acceder al recurso
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author Xu, X. -D.
Mukha, I.
Li, J. G.
Wang, S. M.
Acosta, L.
Bajzek, M.
Casarejos, E.
Cortina-Gil, D.
Espino, J. M.
Fomichev, A.
Geissel, H.
Gomez-Camacho, J.
Grigorenko, L. V.
Kiselev, O.
Korsheninnikov, A. A.
Kostyleva, D.
Kurz, N.
Litvinov, Yu. A.
Martel, I.
Nociforo, C.
Pfutzner, M.
Rodrıguez-Tajes, C.
Scheidenberger, C.
Stanoiu, M.
Suemmerer, K.
Weick, H.
Woods, P. J.
Zhukov, M. V.
author_facet Xu, X. -D.
Mukha, I.
Li, J. G.
Wang, S. M.
Acosta, L.
Bajzek, M.
Casarejos, E.
Cortina-Gil, D.
Espino, J. M.
Fomichev, A.
Geissel, H.
Gomez-Camacho, J.
Grigorenko, L. V.
Kiselev, O.
Korsheninnikov, A. A.
Kostyleva, D.
Kurz, N.
Litvinov, Yu. A.
Martel, I.
Nociforo, C.
Pfutzner, M.
Rodrıguez-Tajes, C.
Scheidenberger, C.
Stanoiu, M.
Suemmerer, K.
Weick, H.
Woods, P. J.
Zhukov, M. V.
contents The previously-unknown nucleus 20Al has been observed for the first time by detecting its in-flight decays. Tracking trajectories of all decay products with silicon micro-strip detectors allowed for a conclusion that 20Al is unbound with respect to three-proton (3p) emission. The 3p-decay energy of 20Al ground state has been determined to be 1.93(+0.11,-0.09) MeV through a detailed study of angular correlations of its decay products, 17Ne+p+p+p. This value is much smaller in comparison with the predictions inferred from the isospin symmetry by using the known energy of its mirror nucleus 20N, which indicates a possible mirror symmetry violation in the structure of 3p emitters. Such an isospin symmetry breaking is supported by the calculations of the continuum embedded theoretical frameworks, describing the observed 20Al ground state as an 1p s-wave state with a spin-parity of 1-, which contradicts to the spin-parity (2-) of the 20N ground state. The 20Al ground state decays by sequential 1p-2p emission via intermediate ground state of 19Mg, which is the first observed case of daughter two-proton radioactivity following 1p decay of the parent state.
format Preprint
id arxiv_https___arxiv_org_abs_2412_08245
institution arXiv
publishDate 2024
record_format arxiv
spellingShingle Mirror Symmetry Breaking Disclosed in the Decay of Three-Proton Emitter 20Al
Xu, X. -D.
Mukha, I.
Li, J. G.
Wang, S. M.
Acosta, L.
Bajzek, M.
Casarejos, E.
Cortina-Gil, D.
Espino, J. M.
Fomichev, A.
Geissel, H.
Gomez-Camacho, J.
Grigorenko, L. V.
Kiselev, O.
Korsheninnikov, A. A.
Kostyleva, D.
Kurz, N.
Litvinov, Yu. A.
Martel, I.
Nociforo, C.
Pfutzner, M.
Rodrıguez-Tajes, C.
Scheidenberger, C.
Stanoiu, M.
Suemmerer, K.
Weick, H.
Woods, P. J.
Zhukov, M. V.
Nuclear Experiment
The previously-unknown nucleus 20Al has been observed for the first time by detecting its in-flight decays. Tracking trajectories of all decay products with silicon micro-strip detectors allowed for a conclusion that 20Al is unbound with respect to three-proton (3p) emission. The 3p-decay energy of 20Al ground state has been determined to be 1.93(+0.11,-0.09) MeV through a detailed study of angular correlations of its decay products, 17Ne+p+p+p. This value is much smaller in comparison with the predictions inferred from the isospin symmetry by using the known energy of its mirror nucleus 20N, which indicates a possible mirror symmetry violation in the structure of 3p emitters. Such an isospin symmetry breaking is supported by the calculations of the continuum embedded theoretical frameworks, describing the observed 20Al ground state as an 1p s-wave state with a spin-parity of 1-, which contradicts to the spin-parity (2-) of the 20N ground state. The 20Al ground state decays by sequential 1p-2p emission via intermediate ground state of 19Mg, which is the first observed case of daughter two-proton radioactivity following 1p decay of the parent state.
title Mirror Symmetry Breaking Disclosed in the Decay of Three-Proton Emitter 20Al
topic Nuclear Experiment
url https://arxiv.org/abs/2412.08245

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