6533b871fe1ef96bd12d2296
RESEARCH PRODUCT
New isomer and decay half-life ofRu115
J. KurpetaIain MooreAnu KankainenW. UrbanJani HakalaAntti SaastamoinenJuho RissanenPasi KarvonenT. MalkiewiczT. MalkiewiczHeikki PenttiläJuha ÄYstöChristine WeberAri JokinenGary SimpsonA. PłochockiV.-v. ElomaaTommi Eronensubject
Nuclear reactionPhysicsNuclear and High Energy Physics010308 nuclear & particles physicsHadron01 natural sciencesDouble beta decayExcited state0103 physical sciencesIsobarAtomic physicsNuclear Experiment010306 general physicsNucleonGround stateRadioactive decaydescription
Exotic, neutron-rich nuclei of mass $A=115$ produced in proton-induced fission of $^{238}\mathrm{U}$ were extracted using the IGISOL mass separator. The beam of isobars was transferred to the JYFLTRAP Penning trap system for further separation to the isotopic level. Monoisotopic samples of $^{115}\mathrm{Ru}$ nuclei were used for $\ensuremath{\gamma}$and $\ensuremath{\beta}$ coincidence spectroscopy. In $^{115}\mathrm{Ru}$ we have observed excited levels, including an isomer with a half-life of 76(6) ms and ($7/{2}^{\ensuremath{-}}$) spin and parity. The first excited 61.7-keV level in $^{115}\mathrm{Ru}$ with spins and parity ($3/{2}^{+}$) may correspond to an $\mathit{oblate}$ $3/{2}^{+}$[431] Nilsson orbital. A half-life of 318(19) ms for the ${\ensuremath{\beta}}^{\ensuremath{-}}$ decay of the ($1/{2}^{+}$) ground state in $^{115}\mathrm{Ru}$ has been firmly established in two independent measurements, a value which is significantly shorter than that previously reported.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-12-28 | Physical Review C |