Phys.Rev. C 97, 054332 (2018)

K.Rezynkina, A.Lopez-Martens, K.Hauschild, I.Deloncle, S.Peru, P.Brionnet, M.L.Chelnokov, V.I.Chepigin, O.Dorvaux, F.Dechery, H.Faure, B.Gall, A.V.Isaev, I.N.Izosimov, D.E.Katrasev, A.N.Kuznetsov, A.A.Kuznetsova, O.N.Malyshev, A.G.Popeko, Y.A.Popov, E.A.Sokol, A.I.Svirikhin, A.V.Yeremin

Influence of octupole vibration on the low-lying structure of ²⁵¹Fm and other heavy N = 151 isotones

RADIOACTIVITY ²⁵⁵No(α)[from ⁴⁸Ca(²⁰⁸Pb, n), E=220 MeV and from ϵ decay of ²⁵⁵Lr produced in ⁴⁸Ca(²⁰⁹Bi, 2n), E=214 MeV using the VASSILISSA separator with the GABRIELA spectrometer at FLNR-JINR, Dubna]; measured Eγ, Iγ, x rays, E(ce), I(ce), Eα, αγ-coin, (ce)α-coin, isomer half-life by γ(t) using implantation silicon detector strips for conversion electrons and α detection, and HPGe detector array for γ detection. ²⁵¹Fm; deduced levels, J, π, conversion coefficients, multipolarities, B(M2), B(E3), and E3/M2 mixing ratio of 5/2+ to g.s transition. Comparison with previous experimental results, and with theoretical calculations. Systematics of low-lying excited states in ²⁴⁵Pu, ²⁴⁷Cm, ²⁴⁹Cf, ²⁵¹Fm, ²⁵³No, ²⁵⁵Rf.

NUCLEAR STRUCTURE ^246,247Cm, ^248,249Cf, ^250,251Fm, ^252,253No, ²⁵⁴Rf; calculated energies of 2- phonon levels in even-A, and 5/2+ states from 2- phonon levels built on 9/2- ground states in odd-A nuclei, B(E3) using QRPA with Gogny D1M parametrization, configuration amplitudes for odd-A isotopes from QPM with Woods-Saxon potential. Comparison with experimental data.

doi: 10.1103/PhysRevC.97.054332