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- W3095996836 abstract "β-delayed one-proton emissions of Si22, the lightest nucleus with an isospin projection Tz=−3, are studied with a silicon array surrounded by high-purity germanium detectors. Properties of β-decay branches and the reduced transition probabilities for the transitions to the low-lying states of Al22 are determined. Compared to the mirror β decay of O22, the largest value of mirror asymmetry in low-lying states by far, with δ=209(96), is found in the transition to the first 1+ excited state. Shell-model calculation with isospin-nonconserving forces, including the T=1, J=2, 3 interaction related to the s1/2 orbit that introduces explicitly the isospin-symmetry breaking force and describes the loosely bound nature of the wave functions of the s1/2 orbit, can reproduce the observed data well and consistently explain the observation that a large δ value occurs for the first but not for the second 1+ excited state of Al22. Our results, while supporting the proton-halo structure in Al22, might provide another means to identify halo nuclei.Received 27 February 2020Revised 26 July 2020Accepted 14 September 2020DOI:https://doi.org/10.1103/PhysRevLett.125.192503© 2020 American Physical SocietyPhysics Subject Headings (PhySH)Research AreasBeta decayNuclear structure & decaysProton emissionNuclear Physics" @default.
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- W3095996836 date "2020-11-05" @default.
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- W3095996836 title "Large Isospin Asymmetry in <mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>Si</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>22</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow><mml:mo>/</mml:mo><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant=normal>O</mml:mi></mml:mrow><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>22</mml:mn></mml:mrow></mml:mmultiscripts></mml:mrow></mml:math> Mirror…" @default.
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- W3095996836 doi "https://doi.org/10.1103/physrevlett.125.192503" @default.
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