Rotational band on the 31 yr 16+ isomer in 178Hf [Phys. Lett. B 393 (1997) 279]

Mullins, S.M.; Dracoulis, George; Byrne, A.P.; McGoram, T.; Bayer, S.; Seale, W. A.; Kondev, F. G.

doi:10.1016/s0370-2693(97)00393-6

Cited by 31 publications

(31 citation statements)

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“…For the 8 − isomers in the N = 106 isotones, shown in Fig. 4, the two-neutron configuration dominates, except in the case of 178 Hf where significant mixing occurs between the neutron and proton 8 − alternatives, with the result that the lower experimental state is strongly mixed, being about 64%ν 2 + 36%π 2 [43][44][45]. However, the lifetimes of the 8 − states range from seconds in the lower-Z cases to about a microsecond in 188 Pb, where the isomer exists in a deformed secondary minimum, while the ground state is spherical [46].…”

Section: Common Building Blocksmentioning

confidence: 98%

Configurations and hindered decays of K isomers in deformed nuclei with A>100

Kondev

Dracoulis

Kibédi

2015

Atomic Data and Nuclear Data Tables

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a b s t r a c tSpectroscopic information on the decay properties of high-K isomers in deformed and transitional nuclei has been evaluated and collated. Assigned multi-quasiparticle configurations are included. Factors that control the transitions strengths, such as various contributions to K mixing, are outlined. The systematics of K -forbidden transitions for different multipolarities are discussed for selected cases in terms of the hindrances, F W , and of the reduced hindrance factor per degree of K forbiddenness, f ν , where ν = |∆K −λ|, ∆K is the K -value difference between the initial and final state and λ is the transition multipole order.With the improved statistics for E1, M1 and E2 transitions, a factorization into the product of the underlying multipolarity-dependent transition strength and a ν-dependence, due to K forbiddenness (f 0 ), is possible. This suggests a weaker dependence on K forbiddenness than is commonly assumed.

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Section: Common Building Blocksmentioning

confidence: 98%

Configurations and hindered decays of K isomers in deformed nuclei with A>100

Kondev

Dracoulis

Kibédi

2015

Atomic Data and Nuclear Data Tables

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“…[16]). For example, |V | = 209 keV was obtained for the K π = 6 + bands in 176 Hf [27], while the mixing between the K π = 8 − bands in 178 Hf [28][29][30] With respect to other two-quasiparticle states and the comparison between theory and experiment in 168 Er, a K π = 6 − state from the ν 2 5/2 − [512] ⊗ 7/2 + [633] configuration is predicted to lie about 50 keV above the 4 − bandhead, although the candidate state at 1773 keV is nearly 700 keV higher. The lower limits on the observed g K − g R values for the 9 − and 8 − band members are in agreement with the large (negative) value predicted (Table II), and the relatively high alignment (see Fig.…”

Section: Configuration Assignmentsmentioning

confidence: 99%

Two-quasiparticle structures and isomers inEr168,Er170
Dracoulis
¹
,
Lane
²
,
Kondev
³

et al. 2010
Phys. Rev. C
27
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15
0
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The stable and neutron-rich isotopes 168 Er, 170 Er, and 172 Er have been studied with Gammasphere using inelastic excitation with energetic 136 Xe beams. The previously assigned structures based on the proposed K π = 4 − isomeric intrinsic states in both 168 Er and 170 Er have been re-evaluated and an equivalent band identified in 172 Er. In 170 Er, the identification of a K π = 6 − band with transitions close in energy to those of the 4 − band leads to a modified interpretation, since the overlap would have compromised previous analyses. The g K − g R values for the 4 − bands deduced from the in-band γ -ray intensities for the sequence of isotopes suggest a predominantly two-neutron configuration in 168 Er, an equally mixed two-neutron, two-proton configuration in 170 Er, and a two-proton configuration in 172 Er. A comprehensive decay scheme for the previously proposed 6 + isomer in 172 Er has also been established, as well as band structures built on this isomer that closely resemble the 6 + and 7 − two-neutron structures known in the isotone 174 Yb. The implied K hindrances are discussed. The main decay path of the 6 + isomer occurs through the newly identified 4 − isomer. The measured lifetimes of the 4 − and 6 + isomers in 172 Er are 57(3) and 822(90) ns, respectively. Multiquasiparticle calculations support the suggested configuration changes across the isotopic chain.

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“…In determining the favorable conditions for triggering γ-ray emission from the isomer, it is necessary to have information on the structure of possible gateway states, as well as possible paths of electromagnetic transitions to and from these states. Experimentally, only a few states close to the 178 Hf isomer have been observed 24,25 . In the PSM calculation 26 for 178 Hf, the model basis is built with the deformation parameters ε 2 = 0.251 and ε 4 = 0.056.…”

Section: 2mentioning

confidence: 99%

Shell Model for Heavy Nuclei and Its Application in Nuclear Astrophysics

Sun

2006

Int. J. Mod. Phys. E

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Performing shell model calculations for heavy nuclei is a long-standing problem in nuclear physics. The shell model truncation in the configuration space is an unavoidable step. The Projected Shell Model (PSM) truncates the space under the guidance of the deformed mean-field solutions. This implies that the PSM uses a novel and efficient way to bridge the two conventional methods: the deformed mean-field approximations, which are widely applied to heavy nuclei but able to describe the physics only in the intrinsic frame, and the spherical shell model diagonalization method, which is most fundamental but feasible only for small systems. We discuss the basic philosophy in construction of the PSM (or generally PSM-like) approach. Several examples from the PSM calculations are presented. Astrophysical applications are emphasized.

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Rotational band on the 31 yr 16+ isomer in 178Hf [Phys. Lett. B 393 (1997) 279]

Cited by 31 publications

References 0 publications

Configurations and hindered decays of K isomers in deformed nuclei with A>100

Configurations and hindered decays of K isomers in deformed nuclei with A>100

Two-quasiparticle structures and isomers inEr168,Er170
Dracoulis
¹
,
Lane
²
,
Kondev
³

et al. 2010
Phys. Rev. C
27
0
15
0
View full text Add to dashboard Cite

Shell Model for Heavy Nuclei and Its Application in Nuclear Astrophysics

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Rotational band on the 31 yr 16+ isomer in 178Hf [Phys. Lett. B 393 (1997) 279]

Cited by 31 publications

References 0 publications

Configurations and hindered decays of K isomers in deformed nuclei with A>100

Configurations and hindered decays of K isomers in deformed nuclei with A>100

Two-quasiparticle structures and isomers inEr168,Er170Dracoulis1, Lane2, Kondev3 et al. 2010Phys. Rev. C270150View full textAdd to dashboardCite

Shell Model for Heavy Nuclei and Its Application in Nuclear Astrophysics

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Two-quasiparticle structures and isomers inEr168,Er170
Dracoulis
¹
,
Lane
²
,
Kondev
³

et al. 2010
Phys. Rev. C
27
0
15
0
View full text Add to dashboard Cite