Phys.Rev. C 104, L061302 (2021)

J.Kleemann, T.Beck, U.Friman-Gayer, N.Pietralla, V.Werner, S.W.Finch, J.Kotila, Krishichayan, B.Loher, H.Pai, O.Papst, W.Tornow, M.Weinert, A.Zilges

Majorana parameters of the interacting boson model of nuclear structure and their implication for 0νββ decay

NUCLEAR REACTIONS ¹⁵⁰Nd(polarized γ, γ'), E=2994 keV; ¹⁵⁰Sm(polarized γ, γ'), E=3113 keV; measured Eγ, Iγ, γ(θ), γ(linear polarization) at the High Intensity γ-ray Source (HIγS) of Duke University. ¹⁵⁰Sm, ¹⁵⁰Nd; deduced γ-branching ratios from the 1+ scissors mode state to the first excited 0+ and second 2+ state in ¹⁵⁰Nd, negative parity for the 3082-keV in ¹⁵⁰Sm, J=1 level, in disagreement with positive parity assigned in the ENSDF database, and confirmed 1+ for the 2994-keV level in ¹⁵⁰Nd; calculated positive-parity levels and B(M1) for 1+ scissors mode (SCM) states using IBM-2, and compared with experimental data in the ENSDF database. Relevance to 0νββ decay mode of ¹⁵⁰Nd.

RADIOACTIVITY ¹⁵⁰Nd(2β^-); calculated nuclear matrix elements (NMEs) for 0νββ decay to the g.s. and the first excited 0+ state in ¹⁵⁰Sm using interacting boson model-2 (IBM-2), and compared with predictions of energy density-functional (EDF) method; deduced strong constraints for the Majorana parameters.

doi: 10.1103/PhysRevC.104.L061302