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Rearrangement of valence neutrons in the neutrinoless double- β decay of Xe 136

Abstract : A quantitative description of the change in ground-state neutron occupancies between 136Xe and 136Ba, the initial and final state in the neutrinoless double-β decay of 136Xe, has been extracted from precision measurements of the cross sections of single-neutron adding and -removing reactions. Comparisons are made to recent theoretical calculations of the same properties using various nuclear-structure models. These are the same calculations used to determine the magnitude of the nuclear matrix elements for the process, which at present disagree with each other by factors of 2 or 3. The experimental neutron occupancies show some disagreement with the theoretical calculations.
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Submitted on : Wednesday, December 7, 2016 - 3:55:41 PM
Last modification on : Monday, May 25, 2020 - 9:42:04 AM

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V. Szwec, B. P. Kay, E. Cocolios, J. P. Entwisle, S. J. Freeman, et al.. Rearrangement of valence neutrons in the neutrinoless double- β decay of Xe 136. Physical Review C, American Physical Society, 2016, 94, pp.054314. ⟨10.1103/PhysRevC.94.054314⟩. ⟨in2p3-01411593⟩

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