6533b829fe1ef96bd12897a3
RESEARCH PRODUCT
Isomer-tagged differential-plunger measurements in proton-unbound 144Ho
P. RahkilaA. PuurunenT. PissullaW. RotherUlrika JakobssonS. JuutinenPauli PeuraPanu RuotsalainenN. M. LumleyJuha SorriJuha UusitaloR. JulinC. ScholeyPaul GreenleesB. NiclasenM. NymanPeter M. JonesJan SarénD. M. CullenA. DewaldSteffen KetelhutH. IwasakiMatti LeinoO. MöllerP. J. R. MasonFurong XuJ. A. Daresubject
PhysicsNuclear and High Energy PhysicsProton010308 nuclear & particles physicsOperator (physics)Quantum number01 natural sciencesRecoilExcited state0103 physical sciencesPotential energy surfaceQuasiparticleAtomic physics010306 general physicsSpin (physics)description
The lifetime of an excited state above a weakly populated isomer in the proton-unbound odd-odd nucleus 144Ho has been measured using the recoil distance Doppler shift method. This measurement represents the first differential-plunger lifetime measurement to utilize recoil-isomer tagging. The first excited I[pi]=(10+) state above the two-quasiparticle [pi]h11/2[circle times operator][nu]h11/2(8+) isomer was determined to have a lifetime of [tau]=6(1)�ps. Potential energy surface calculations, based on the configuration-constrained blocking method, predict the isomeric state to have [gamma]-soft triaxial-nuclear shape with [gamma][approximate]24�. The lifetime of the (10+) state can be understood from these calculations if there is a degree of rotational alignment in this band, with the K value being lower than the bandhead spin. However, the validity of the K quantum number with large predicted triaxiality and gamma softness requires further theoretical study.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2010-01-01 | Physics Letters B |