6533b82cfe1ef96bd128ffdb

RESEARCH PRODUCT

Nuclear structure of (231)Ac

Berta RubioL. M. FraileL. M. FraileT. MartinezLuis M. García-raffiOlof TengbladOlof TengbladHenryk MachR. BoutamiGunnar LøvhøidenK. GuldaA. J. AasW. KurcewiczM. J. G. BorgeJ. L. Tain

subject

Nuclear reactionPhysicsNuclear and High Energy PhysicsDecay schemeNuclear structureHalf-lifeFísicaElectronNuclear physicsGamma spectroscopyNuclear Physics - ExperimentAtomic physicsSpectroscopyRadioactive decay

description

The low-energy structure of 231Ac has been investigated by means of gamma ray spectroscopy following the beta-decay of 231Ra. Multipolarities of 28 transitions have been established by measuring conversion electrons with a mini-orange electron spectrometer. The decay scheme of 231Ra --> 231Ac has been constructed for the first time. The Advanced Time Delayed beta-gamma-gamma(t) method has been used to measure the half-lives of five levels. The moderately fast B(E1) transition rates derived suggest that the octupole effects, albeit weak, are still present in this exotic nucleus. The low-energy structure of 231 Ac has been investigated by means of γ ray spectroscopy following the β − decay of 231 Ra. Multipolarities of 28 transitions have been established by measuring conversion electrons with a mini-orange electron spectrometer. The decay scheme of 231 Ra → 231 Ac has been constructed for the first time. The Advanced Time Delayed β γ γ ( t ) method has been used to measure the half-lives of five levels. The moderately fast B (E1) transition rates derived suggest that the octupole effects, albeit weak, are still present in this exotic nucleus. The low-energy structure of 231Ac has been investigated by means of gamma ray spectroscopy following the beta-decay of 231Ra. Multipolarities of 28 transitions have been established by measuring conversion electrons with a mini-orange electron spectrometer. The decay scheme of 231Ra --> 231Ac has been constructed for the first time. The Advanced Time Delayed beta-gamma-gamma(t) method has been used to measure the half-lives of five levels. The moderately fast B(E1) transition rates derived suggest that the octupole effects, albeit weak, are still present in this exotic nucleus.

10.1016/j.nuclphysa.2008.08.005http://hdl.handle.net/10550/42765