6533b7d7fe1ef96bd12684ea
RESEARCH PRODUCT
Collective structure of the neutron-rich nuclei, 110Ru and 112Ru
R. BéraudZ. JanasM. LeinoMarco MeyerJ.m. ParmonenPeter DendoovenN. RedonJean-arcady MeyerP. TaskinenJuha ÄYstöAri JokinenHeikki PenttiläP.p. JauhoK. J. EskolaA. EmsallemR. Duffaitsubject
PhysicsNuclear and High Energy PhysicsIsotopes of germaniumIsotope010308 nuclear & particles physicsNuclear Theory7. Clean energy01 natural sciencesBeta decayNeutron number0103 physical sciencesIsotopes of zirconiumNeutronAtomic physicsNuclear Experiment010306 general physicsGround states-processdescription
Abstract The collective structure of 110 Ru and 112 Ru has been studied at the IGISOL facility through the beta decay of 110 Tc and 112 Tc. Neutron-rich technetium isotopes were produced by the 238 U(p, f) reaction at 20 MeV bombarding energy. The new isotope 112 Tc was found to decay with a half-life of 280(30) ms. The observed energies of the 2 + and 4 + ground state band levels in 108,110,112 Ru are almost the same. However, a steady energy decrease of the proposed gamma band head is observed with increasing neutron number, suggesting importance of triaxiality in these nuclei. In fact, only in 192 Os the second 2 + state has been observed at lower excitation than in 112 Ru. The static deformation of 108,110,110 Ru isotopes has been investigated in microscopic lattice Hartree-Fock calculations. The obtained potential energy surfaces predict that these isotopes are deformed (β ∼ 0.3), with a quasidegeneracy associated with γ-deformation, and suggest that the γ-asymmetry softness increases with the neutron number for neutron-rich ruthenium isotopes.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 1990-09-03 | Nuclear Physics A |