Phys.Rev. C 101, 034310 (2020)

P.Mosat, F.P.Hessberger, S.Antalic, D.Ackermann, B.Andel, M.Block, S.Hofmann, Z.Kalaninova, B.Kindler, M.Laatiaoui, B.Lommel, A.K.Mistry, J.Piot, M.Vostinar

K isomerism in ²⁵⁵Rf and total kinetic energy measurements for spontaneous fission of ^{255, 256, 258}Rf

RADIOACTIVITY ^255,256RF(SF)[from ^207,208Pb(⁵⁰Ti, 2n), E=228.8, 238.3, 239.8 MeV]; ²⁵⁸Db(EC)[from ²⁰⁹Bi(⁵⁰Ti, n), E=232.6 MeV]; ²⁵⁸Rf(SF)[from ²⁵⁸Db(EC)]; measured evaporation residues (ERs) using the velocity filter SHIP at GSI, spontaneous fission events using time and position correlations, (fragment)(fragment)-coin, total kinetic energy (TKE) distributions of SF fragments, half-lives of ^255,256Rf decays from ER-SF correlated events, half-life of ²⁵⁸Rf decay from ce-SF correlated events, Eγ, Iγ, x rays, ce, γ(ce)-coin, K-isomers and their half-lives in ²⁵⁵Rf from ER-ce-SF/α and ER-ce-(ce)-SF/α correlated events using the STOP and BOX silicon strip detectors, and Ge clover detector at GSI; deduced tentative bimodal fission mode. ²⁵⁵Rf; deduced levels, J, π, two new high-K isomers and their Nilsson configurations; proposed level schemes of the isomers.

doi: 10.1103/PhysRevC.101.034310