The four quasi-particle 178Hf isomeric state, its excitation energy and multipolarities of deexciting transitions

Boer, F.W.N. de; Goudsmit, P.F.A.; Meijer, B.J.; Kapteyn, Johanna C.; Konijn, J.; Kamermans, R.

doi:10.1016/0375-9474(76)90196-2

Cited by 38 publications

(7 citation statements)

References 18 publications

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“…These values may be combined according to their relative contributions to the transition rate, so that f"'"'~= [a~(f"~) + a2(f"2) "]~~" . Assuming aq --0.64 and a~--0.36, for the neutron and proton contributions, respectively [11], the result is f '"'s = 80, which is in agreement with the experimental value. It should be noted, however, that the result is dominated by the lower f"value (for the neutron component) and has little sensitivity to the f"value for the proton component.…”

supporting

confidence: 88%

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Kπ=6+and
Walker
¹
,
Dracoulis
²
,
Byrne
³

et al. 1994
Phys. Rev. C

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A recoil-shadow measurement of isomer decays in Hf has revealed many weak p-ray transitions.One of these is a sevenfold K-forbidden El transition from the K = 8 isomer (Til2 --163 ns) to the K = 0+ ground-state band. The low hindrance factor for this transition in Hf is compared with the hindrance factors for other AK = 8 El transitions.PACS number(s): 21.10.Jx, 2?.70. +qThe well-deformed hafnium (Z = 72) isotopes contain multiquasiparticle K isomers, with half-lives ranging from nanoseconds to years [1]. K = 6+ and 8, twoquasiparticle isomers are observed systematically &om Hf to Hf, and there are related three-quasiparticle isomers in the intervening odd-K isotopes [2,3]. The pray transition-rate hindrance factors correlate strongly [4] with the degree of K forbiddenness, v = AK -A (where A is the transition multipolarity), but the hindrance factors also have a significant neutron (and proton) number

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confidence: 88%

“…In Hf, with N = 106 and Z = 72, there are two K" = 8 states 332 keV apart. The neutron and proton configurations mix, and the lower (isomeric) level is [11] 64% v and 36% 7r .…”

mentioning

confidence: 99%

Kπ=6+and
Walker
¹
,
Dracoulis
²
,
Byrne
³

et al. 1994
Phys. Rev. C

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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: 91%

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

Kondev

Dracoulis

Kibédi

2015

Atomic Data and Nuclear Data Tables

100

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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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“…Indeed, this raises the question of why the 4 + 1 state is observed at such low energy. The answer may lie in a two-state mixing between the ν 2 ([523]5/2, [521]3/2) and π 2 ([413]5/2, [411]3/2) K π = 4 + bands, similar to that observed in the K π = 6 + and 8 − bands in 176 Hf and 178 Hf [35,36]. For the 160 Gd case, the ν 2 ([523]5/2, [521]3/2) state is driven to lower energy than expected, and conversely the π 2 ([413]5/2, [411]3/2) level is driven to higher energy (as discussed in the previous paragraph).…”

Section: Discussionmentioning

confidence: 89%

High- K , two-quasiparticle states in Gd160

et al. 2020

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Excited states in 160 Gd were populated via β decay from the low-and high-spin isomers in 160 Eu. The highspin, K π = 5 − state feeds several two-quasiparticle levels, as well as a sequence associated with a γ vibration and a K π = 4 + , hexadecapole vibrational structure. The decay scheme was significantly improved with the observation of new transitions and states when compared with the two competing level schemes from over four decades ago. Configuration assignments for some of the multiquasiparticle levels have been suggested, based upon decay properties, systematics from neighboring nuclei, and comparisons with theoretical calculations. In addition, 15 new low-spin states and approximately 60 new transitions were observed resulting from the decay of the low-spin 160 Eu isomer.

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The four quasi-particle 178Hf isomeric state, its excitation energy and multipolarities of deexciting transitions

Cited by 38 publications

References 18 publications

Kπ=6+and
Walker
¹
,
Dracoulis
²
,
Byrne
³

et al. 1994
Phys. Rev. C

Kπ=6+and
Walker
¹
,
Dracoulis
²
,
Byrne
³

et al. 1994
Phys. Rev. C

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

High- K , two-quasiparticle states in Gd160

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The four quasi-particle 178Hf isomeric state, its excitation energy and multipolarities of deexciting transitions

Cited by 38 publications

References 18 publications

Kπ=6+andWalker1, Dracoulis2, Byrne3 et al. 1994Phys. Rev. C

Kπ=6+andWalker1, Dracoulis2, Byrne3 et al. 1994Phys. Rev. C

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

High- K , two-quasiparticle states in Gd160

Contact Info

Product

Resources

About

Kπ=6+and
Walker
¹
,
Dracoulis
²
,
Byrne
³

et al. 1994
Phys. Rev. C

Kπ=6+and
Walker
¹
,
Dracoulis
²
,
Byrne
³

et al. 1994
Phys. Rev. C