Article,

Constraint on 0 nu beta beta Matrix Elements from a Novel Decay Channel of the Scissors Mode: The Case of Gd-154

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Physical Review Letters, (October 2013)
DOI: 10.1103/PhysRevLett.111.172501

Abstract

The nucleus Gd-154 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 gamma-ray scattering experiments and a gamma gamma-coincidence study following electron capture decay of Tb-154(m). 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)mu(2)(N). The properties of the scissors mode of Gd-154 imply a much larger matrix element than previously thought for the neutrinoless double-beta decay to the 0(2)(+) state in such a shape-transitional region. Theory indicates an even larger effect for Nd-150.

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