6533b7dcfe1ef96bd127328e
RESEARCH PRODUCT
Low-lying states in Ra219 and Rn215 : Sampling microsecond α -decaying nuclei
Alexander YakushevIngemar RagnarssonN. KurzJulia EvenK. P. RykaczewskiT. TorresCarl J GrossI. KojouharovAndreas TürlerR.-d. HerzbergDirk RudolphJ. P. OmtvedtJörg RunkeJörg RunkeB. SchaustenLuis SarmientoJ. KrierF. P. HeßbergerPavel GolubevCh. E. DüllmannCh. E. DüllmannJ. M. GatesBirgit KindlerL.-l. AnderssonMichael BlockMichael BlockJ. V. KratzB. G. CarlssonNorbert WiehlBettina LommelKlaus EberhardtDieter AckermannPetra Thörle-pospiechNorbert TrautmannEgon JägerH. SchaffnerClaes FahlanderKenneth E. GregorichJ. GerlMatthias SchädelA. Di NittoA. WardU. ForsbergC. MokryJ LjungbergA. Såmark-rothPhilippos PapadakisH. BrandA. K. MistryJadambaa KhuyagbaatarDaniel Coxsubject
Physics010308 nuclear & particles physicsNuclear shell modelHalf-life01 natural sciencesNuclear physicsMicrosecond0103 physical sciencesAtomic nucleusGamma spectroscopyAlpha decayDecay chainNuclide010306 general physicsdescription
Short-lived α-decaying nuclei "northeast" of 208Pb in the chart of nuclides were studied using the reaction 48Ca+243Am with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even 220Ra and its odd-A neighbors, 219Fr, and 219,221Ra, with a focus on the 219Ra→215Rn decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of 219Ra is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations. (Less)
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-10-09 | Physical Review C |