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Ground State Decay of the Three-Proton Emitter $^{17}$Na Reveals Isospin Symmetry Breaking

Fuente: arXiv
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Autori principali: Xu, X. -D., Mukha, I., Xu, Z. C., Wang, S. M., Zhang, K. Y., Acosta, L., Casarejos, E., Cortina-Gil, D., Espino, J. M., Fomichev, A., Geissel, H., Gómez-Camacho, J., Grigorenko, L. V., Kiselev, O., Korsheninnikov, A. A., Kurz, N., Litvinov, Yu. A., Martel, I., Nociforo, C., Pfützner, M., Rodríguez-Tajes, C., Scheidenberger, C., Stanoiu, M., Sümmerer, K., Weick, H., Woods, P. J., Zhukov, M. V.
Natura: Preprint
Pubblicazione: 2026
Soggetti:
Nuclear Experiment
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author Xu, X. -D.
Mukha, I.
Xu, Z. C.
Wang, S. M.
Zhang, K. Y.
Acosta, L.
Casarejos, E.
Cortina-Gil, D.
Espino, J. M.
Fomichev, A.
Geissel, H.
Gómez-Camacho, J.
Grigorenko, L. V.
Kiselev, O.
Korsheninnikov, A. A.
Kurz, N.
Litvinov, Yu. A.
Martel, I.
Nociforo, C.
Pfützner, M.
Rodríguez-Tajes, C.
Scheidenberger, C.
Stanoiu, M.
Sümmerer, K.
Weick, H.
Woods, P. J.
Zhukov, M. V.
author_facet Xu, X. -D.
Mukha, I.
Xu, Z. C.
Wang, S. M.
Zhang, K. Y.
Acosta, L.
Casarejos, E.
Cortina-Gil, D.
Espino, J. M.
Fomichev, A.
Geissel, H.
Gómez-Camacho, J.
Grigorenko, L. V.
Kiselev, O.
Korsheninnikov, A. A.
Kurz, N.
Litvinov, Yu. A.
Martel, I.
Nociforo, C.
Pfützner, M.
Rodríguez-Tajes, C.
Scheidenberger, C.
Stanoiu, M.
Sümmerer, K.
Weick, H.
Woods, P. J.
Zhukov, M. V.
contents The spectrum of the exotic three-proton (3p) emitter $^{17}$Na has been studied by detecting all in-flight decay products. Derived from the measured angular correlations $^{14}$O+p+p+p, a resonant peak has been discovered at the 3p-decay energy of 2.24($^{+0.17}_{-0.25}$) MeV, which likely corresponds to the $^{17}$Na ground state. This decay energy value is significantly smaller than the previous experimental upper limit. Our measured $^{14}$O-p correlations stemming from the ground state decay have been quantitatively described by a sequential 1p-2p emission from a $^{17}$Na resonance via the intermediate $^{16}$Ne ground state, which allowed to derive the upper limit of $^{17}$Na ground-state width of 0.6 MeV. A dramatic systematic decrease in the mirror energy differences of mirror nuclei pairs has been observed at almost all 3p emitters with known proton separation energy (such as $^{31}$K, $^{20}$Al, and $^{17}$Na), in sharp contrast to the behavior in less exotic nuclei. Such a lowering effect indicates a general trend in evolution of nuclear structure for light to medium mass nuclei beyond the proton drip line, which is often associated with strong isospin symmetry breaking.
format Preprint
id arxiv_https___arxiv_org_abs_2604_08229
institution arXiv
publishDate 2026
record_format arxiv
spellingShingle Ground State Decay of the Three-Proton Emitter $^{17}$Na Reveals Isospin Symmetry Breaking
Xu, X. -D.
Mukha, I.
Xu, Z. C.
Wang, S. M.
Zhang, K. Y.
Acosta, L.
Casarejos, E.
Cortina-Gil, D.
Espino, J. M.
Fomichev, A.
Geissel, H.
Gómez-Camacho, J.
Grigorenko, L. V.
Kiselev, O.
Korsheninnikov, A. A.
Kurz, N.
Litvinov, Yu. A.
Martel, I.
Nociforo, C.
Pfützner, M.
Rodríguez-Tajes, C.
Scheidenberger, C.
Stanoiu, M.
Sümmerer, K.
Weick, H.
Woods, P. J.
Zhukov, M. V.
Nuclear Experiment
The spectrum of the exotic three-proton (3p) emitter $^{17}$Na has been studied by detecting all in-flight decay products. Derived from the measured angular correlations $^{14}$O+p+p+p, a resonant peak has been discovered at the 3p-decay energy of 2.24($^{+0.17}_{-0.25}$) MeV, which likely corresponds to the $^{17}$Na ground state. This decay energy value is significantly smaller than the previous experimental upper limit. Our measured $^{14}$O-p correlations stemming from the ground state decay have been quantitatively described by a sequential 1p-2p emission from a $^{17}$Na resonance via the intermediate $^{16}$Ne ground state, which allowed to derive the upper limit of $^{17}$Na ground-state width of 0.6 MeV. A dramatic systematic decrease in the mirror energy differences of mirror nuclei pairs has been observed at almost all 3p emitters with known proton separation energy (such as $^{31}$K, $^{20}$Al, and $^{17}$Na), in sharp contrast to the behavior in less exotic nuclei. Such a lowering effect indicates a general trend in evolution of nuclear structure for light to medium mass nuclei beyond the proton drip line, which is often associated with strong isospin symmetry breaking.
title Ground State Decay of the Three-Proton Emitter $^{17}$Na Reveals Isospin Symmetry Breaking
topic Nuclear Experiment
url https://arxiv.org/abs/2604.08229

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