Constraint on 0νββ matrix elements from a novel decay channel of the scissors mode: the case of Gd154

J. Beller, N. Pietralla, J. Barea, M. Elvers, J. Endres, C. Fransen, J. Kotila, O. Möller, A. Richter, T. R. Rodríguez, C. Romig, D. Savran, M. Scheck, L. Schnorrenberger, K. Sonnabend, V. Werner, A. Zilges, M. Zweidinger

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Abstract

The nucleus Gd154 is located in a region of the nuclear chart where rapid changes of nuclear deformation occur as a function of particle number. It was investigated using a combination of γ-ray scattering experiments and a γγ-coincidence study following electron capture decay of Tbm154. A novel decay channel from the scissors mode to the first excited 0+ state was observed. Its transition strength was determined to B(M1;1+sc→0+2)=0.031(4)μ2N. The properties of the scissors mode of Gd154 imply a much larger matrix element than previously thought for the neutrinoless double-β decay to the 0+2 state in such a shape-transitional region. Theory indicates an even larger effect for Nd150.
Original languageEnglish
Article number172501
JournalPhysical Review Letters
Volume111
Issue number17
DOIs
Publication statusPublished - 1 Oct 2013

Keywords

  • beta-decay
  • nuclei
  • neutrinos

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    Beller, J., Pietralla, N., Barea, J., Elvers, M., Endres, J., Fransen, C., Kotila, J., Möller, O., Richter, A., Rodríguez, T. R., Romig, C., Savran, D., Scheck, M., Schnorrenberger, L., Sonnabend, K., Werner, V., Zilges, A., & Zweidinger, M. (2013). Constraint on 0νββ matrix elements from a novel decay channel of the scissors mode: the case of Gd154. Physical Review Letters, 111(17), [172501]. https://doi.org/10.1103/PhysRevLett.111.172501