Phys.Rev. C 96, 044333 (2017)

W.Urban, M.Czerwinski, J.Kurpeta, T.Rzaca-Urban, J.Wisniewski, T.Materna, L.W.Iskra, A.G.Smith, I.Ahmad, A.Blanc, H.Faust, U.Koster, M.Jentschel, P.Mutti, T.Soldner, G.S.Simpson, J.A.Pinston, G.de France, C.A.Ur, V.-V.Elomaa, T.Eronen, J.Hakala, A.Jokinen, A.Kankainen, I.D.Moore, J.Rissanen, A.Saastamoinen, J.Szerypo, C.Weber, J.Aysto

Shape coexistence in the odd-odd nucleus ⁹⁸Y: The role of the g_9/2 neutron extruder

NUCLEAR REACTIONS ²³⁵U(n, F), E=cold neutrons from PF1B facility at ILL Grenoble; measured Eγ, Iγ, γγ-coin, delayed γγ-coin, half-lives of several isomers in ⁹⁸Y using the EXILL array at Grenoble. ⁹⁸Y; deduced levels, isomers, J, π, bands, configurations, deformed and spherical isomers.

RADIOACTIVITY ²⁴⁸Cm, ²⁵²Cf(SF); measured Eγ, Iγ, γγ-coin, γγ(θ), γγ-coin with γ rays from fission partner ¹⁴⁷La in ²⁴⁸Cm SF decay using Eurogam2 array at Grenoble and Gammasphere array at Argonne. ⁹⁸Y; deduced levels, J, π, multipolarities. ⁹⁸Sr, ^98,98mY(β^-)[from ²³⁵U(n, F), E=cold neutrons and using Lohengrin fission-fragment separator]; measured Eγ, Iγ, γγ-coin, γγ(θ), γγ(linear pol), half-lives of decays of ⁹⁸Sr, ⁹⁸Y and ⁹⁸Y isomer, excitation energy of the 2.36-s isomer in ⁹⁸Y by using JYFLTRAP Penning trap at Jyvaskyla accelerator facility, . ⁹⁸Y, ⁹⁸Zr; deduced levels, J, π, multipolarities, mixing ratios, β feedings, logft, configurations. Comparison of negative-parity levels in ⁹⁸Y with Interacting Boson Fermion Fermion Model (IBFFM) and Quasi-Particle Rotor Model (QPRM) calculations.

doi: 10.1103/PhysRevC.96.044333