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Author  |
Xu, X.D. et al; Cortina-Gil, D. |
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Title |
Isospin Symmetry Breaking Disclosed in the Decay of Three-Proton Emitter 20Al |
Type |
Journal Article |
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Year |
2025 |
Publication |
Physical Review Letters |
Abbreviated Journal |
Phys. Rev. Lett. |
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Volume |
135 |
Issue |
2 |
Pages |
022502 - 9pp |
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Abstract |
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 microstrip detectors allowed for a conclusion that 20Al is unbound with respect to three-proton (3p) emission. The 3p-decay energy of the 20Al ground state has been determined to be 1.93(+0.12-0.10) MeV through a detailed study of angular correlations of its decay products, 17Ne + p + p + p. This value is significantly smaller than the predictions inferred from the isospin symmetry by using the known neutron separation energy of its mirror nucleus 20N, which indicates a possible isospin symmetry breaking in the mirror nuclei 20Al and 20N. This observed isospin symmetry breaking is supported by the calculations of the continuum embedded theoretical frameworks, describing the observed 20Al ground state as a 1p s-wave state with a spin-parity of 1-, which differs from the spin-parity (2-) of the 20N ground state. The 20Al ground state decays by sequential 1p-2p emission via the intermediate ground state of 19Mg, which is the first observed case of “daughter” 2p radioactivity following 1p decay of the parent state. |
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Address |
[Xu, X. -D.; Li, J. G.] Chinese Acad Sci, Inst Modern Phys, Lanzhou 730000, Peoples R China, Email: xiaodong.xu@impcas.ac.cn; |
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Publisher |
Amer Physical Soc |
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Language |
English |
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Original Title |
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Series Volume |
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Edition |
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ISSN |
0031-9007 |
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Notes |
WOS:001538729900008 |
Approved |
no |
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Is ISI |
yes |
International Collaboration |
yes |
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Call Number |
IFIC @ pastor @ |
Serial |
6778 |
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