Heavy isotopes of actinium: 229Ac, 230Ac, 231Ac and 232Ac

Chayawattanangkur, K.; Herrmann, G.; Trautmann, Ν.

doi:10.1016/0022-1902(73)80003-x

Cited by 36 publications

(8 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Although a direct observation of this state has not yet been possible, an estimate of its properties can be obtained by extrapolation from properties of the higher lying levels in 229 Th. Excited states in 229 Th have been previously studied in the α decay of 233 U [8,9], β decay of 229 Ac [10], and electron-capture decay of 229 Pa [11] as well as in transfer reactions [12,13] and Coulomb excitations [14]. Recently, new * Electronic address: ewa@ipj.gov.pl † Deceased.…”

Section: Introductionmentioning

confidence: 99%

Nuclear structure ofTh229

Ruchowska

Cederkäll

2006

Phys. Rev. C

View full text Add to dashboard Cite

Lifetimes of excited states in 229 Th, populated in the β decay of 229 Ac, have been measured using the advanced time-delayed βγ γ (t) method. Half-lives of 14 states have been determined including 11 of them for the first time. Twenty-seven new γ lines have been introduced into the β-decay scheme of 229 Ac based on results of γ γ coincidence measurements. Reduced transition probabilities have been determined for more than 70 γ transitions in 229 Th. Average |D 0 | values of 0.029(1), 0.077(3), and 0.024(5) e fm have been deduced for the lowest K π = 1/2 ± , 3/2 ± , and 5/2 ± parity partner bands, respectively. Excited states in 229 Th and experimental transition rates have been interpreted within the quasiparticle-plus-phonon model. The half-life of the 3.5-eV, 3/2 + isomeric state is predicted to be about 10 h. Potential energy surfaces on the (β 2 , β 3 ) plane for the lowest single quasiparticle configurations in 229 Th have been calculated using the Strutinsky method.

show abstract

Section: Introductionmentioning

confidence: 99%

Nuclear structure ofTh229

Ruchowska

Cederkäll

2006

Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…Investigations of the 229 Th level scheme based on the α decay of 233 U were also performed by Canty [60] and later by Barci [8]. Further investigations of the 229 Th level structure were performed by Coulomb excitation [15] and by β − decay of 229 Ac [65,111,299].…”

Section: Th γ -Ray Spectroscopymentioning

confidence: 99%

The $$^{229}$$Th isomer: prospects for a nuclear optical clock

Wense

2020

Eur. Phys. J. A

View full text Add to dashboard Cite

The proposal for the development of a nuclear optical clock has triggered a multitude of experimental and theoretical studies. In particular the prediction of an unprecedented systematic frequency uncertainty of about $$10^{-19}$$ 10 - 19 has rendered a nuclear clock an interesting tool for many applications, potentially even for a re-definition of the second. The focus of the corresponding research is a nuclear transition of the $$^{229}$$ 229 Th nucleus, which possesses a uniquely low nuclear excitation energy of only $$8.12\pm 0.11$$ 8.12 ± 0.11 eV ($$152.7\pm 2.1$$ 152.7 ± 2.1 nm). This energy is sufficiently low to allow for nuclear laser spectroscopy, an inherent requirement for a nuclear clock. Recently, some significant progress toward the development of a nuclear frequency standard has been made and by today there is no doubt that a nuclear clock will become reality, most likely not even in the too far future. Here we present a comprehensive review of the current status of nuclear clock development with the objective of providing a rather complete list of literature related to the topic, which could serve as a reference for future investigations.

show abstract

“…In "Preparation of Ra 229 and Ac 229 " Depocas and Harvey reported the discovery of 229 Ac in 1952 [41]. 228 229 Ac, 230 Ac, 231 Ac and 232 Ac" [46]. 232 Th was irradiated with 150 MeV bremsstrahlung γ rays from the Mainz electron linear accelerator.…”

Section: Acmentioning

confidence: 99%