Yrast structure of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msup><mml:mrow /><mml:mn>206</mml:mn></mml:msup></mml:math>Bi: Isomeric states and one-proton-particle, three-neutron-hole excitations

Cieplicka, N.; Maier, K. H.; Fornal, B.; Szpak, B.; Janssens, R. V. F.; Alcorta, M.; Broda, R.; Carpenter, M. P.; Chiara, C. J.; Hoffman, C. R.; Kay, B. P.; Kondev, F. G.; Królas, W.; Lauritsen, T.; Lister, C. J.; McCutchan, E. A.; Pawłat, T.; Rogers, A. M.; Seweryniak, D.; Sharp, N. C. C.; Walters, W. B.; Wrzesiński, J.

doi:10.1103/physrevc.86.054322

Cited by 19 publications

(19 citation statements)

References 17 publications

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“…The higher states up to the J π = 31 + isomer are presumed [191] to involve either proton or neutron core excitations (or both), but those were not within the scope of the shell-model calculations reported.…”

Section: Particle and Hole Nuclei Neighbouring Z = 82mentioning

confidence: 88%

“…There is a distinctive correlation, with significant differences in the actual magnitudes, depending on whether the decays involve a change in the proton or neutron component of the configuration. The highest and lowest examples marked correspond to 174 Yb at the upper end, and to the transitional nucleus, 191 Os at the lower end. Two "outliers" are marked: the very low value for 171 Tm has been explained as an example of random two-state mixing between the isomeric intrinsic state and a collective (band) state (see Ref.…”

Section: K-hindrancesmentioning

confidence: 99%

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Review of metastable states in heavy nuclei

2016

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Abstract.The structure of nuclear isomeric states is reviewed in the context of their role in contemporary nuclear physics research. Emphasis is given to high-spin isomers in heavy nuclei, with A 150. The possibility to exploit isomers to study some of the most exotic nuclei is a recurring theme. In spherical nuclei, the role of octupole collectivity is discussed in detail, while in deformed nuclei the limitations of the K quantum number are addressed. Isomer targets and isomer beams are considered, along with applications related to energy storage, astrophysics, medicine, and experimental advances.

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Section: Particle and Hole Nuclei Neighbouring Z = 82mentioning

confidence: 88%

Section: K-hindrancesmentioning

confidence: 99%

Review of metastable states in heavy nuclei

2016

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“…The results described above establish the 210 Pb level scheme up to nearly 6 MeV excitation and in the I = 17 spin range, i.e., much lower than the 16.4 MeV and I ∼ 32 limits reached in 208 Pb [2], and the I ∼ 30 spin range established in spectroscopy studies with DIHIR of other nuclei in the region such as 204 Tl [12] and 206 Bi [13]. Since the 210 Pb production yields in the reactions under investigation in the present work were sufficient to provide high-statistics data, the inability to extend the level scheme to higher excitation energy and angular momentum is rather unusual.…”

Section: B Identification Of ν G 9/2 I 11/2 Statesmentioning

confidence: 99%

Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in
Broda
¹
,
Iskra
²
,
Janssens
³

et al. 2018
Phys. Rev. C
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Yrast and near-yrast levels up to an I = 17h spin value and a 6-MeV excitation energy have been delineated in the "two-neutron" 210 Pb nucleus following deep-inelastic reactions involving 208 Pb targets and a number of heavy-ion beams at energies ∼25% above the Coulomb barrier. The level scheme was established on the basis of multifold prompt and delayed coincidence relationships measured with the Gammasphere array. In addition to the previously known states, many new levels were identified. For most of the strongly populated states, spin-parity assignments are proposed on the basis of angular distributions. The reinvestigation of the ν(g 9/2 ) 2 , 8 + isomeric decay results in the firm identification of the low-energy E2 transitions involved in the 8 + → 6 + → 4 + cascade, and in a revised 6 + level half-life of 92(10) ns, nearly a factor of 2 longer than previously measured. Among the newly identified states figure spin I = 4-10h levels associated with the νg 9/2 i 11/2 multiplet, as well as yrast states involving νg 9/2 j 15/2 , νi 11/2 j 15/2 , and ν(j 15/2 ) 2 neutron couplings. The highest-spin excitations are understood as 1p-1h core excitations and the yrast population is found to be fragmented to the extent that levels of spin higher than I = 17h could not be reached. Four E3 transitions are present in the 210 Pb yrast decay; three of these involve the g 9/2 → j 15/2 octupole component, as reflected in the 21(2) and > 10 Weisskopf unit enhancements of the B(E3) rates of the first two. The fourth, 16 + → 13 − E3 transition corresponds to the 3 − core octupole excitation built on the νi 11/2 j 15/2 state, in analogy to a similar E3 coupling to the νj 15/2 level in 209 Pb. Shell-model calculations performed for two-neutron states and 1p-1h 208 Pb core excitations are in good agreement with the data. Evidence was found for the existence of a hitherto unknown high-spin β-decaying isomer in 210 Tl. Shell-model calculations of the 210 Tl levels suggest the possibility of a 11 + long-lived, β-decaying state, and the delayed yields observed in various reactions fit rather well with a 210 Tl assignment.

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“…In the 208 Pb region, this development resulted in the delineation of excitations associated with rather pure configurations, including many isomers arising from the energy-favored coupling of the available valence particles and holes. High-spin levels up to nearly I = 30 spin values were established in many nuclei often quite distant from the closed 208 Pb core, such as 203 Hg [5], 204 Hg [6], 204 Tl [7], 205 Tl [8], and 206 Bi [9]. Somewhat lower-spin yrast structures were studied in the closer neighbors; e.g., 207 Pb [10], 209 Pb [11], 207 Tl [12], and 206 Hg [13].…”

Section: Introductionmentioning

confidence: 99%

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

et al. 2017

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Abstract:Yrast and near-yrast levels up to spin values in excess of I = 30ħ have been delineated in the doubly-magic 208 Pb nucleus following deep-inelastic reactions involving 208 Pb targets and, mostly, 430-MeV 48 Ca and 1440-MeV 208 Pb beams. The level scheme was established up to an excitation energy of 16.4 MeV, based on multi-fold γ-ray coincidence relationships measured with the Gammasphere array. Below the well-known, 0.5-μs 10 + isomer, ten new transitions were added to earlier work. The delineation of the higher parts of the level sequence benefited from analyses involving a number of prompt-and delayed-coincidence conditions. Three new isomeric states were established along the yrast line with I π = 20 -(10342 keV), 23 + (11361 keV), and 28 -(13675 keV), and respective half-lives of 22(3), 12.7(2), and 60(6) ns. Gamma transitions were also identified preceding in time the 28 -isomer, however, only a few could be placed in the level scheme and no firm spin-parity quantum numbers could be proposed. In contrast, for most states below this 28 -isomer, firm spin-parity values were assigned, based on total electron-conversion coefficients, deduced for low-energy (<500 keV) transitions from γ-intensity balances, and on measured γ-ray angular distributions. The latter also enabled the quantitative determination of mixing ratios. The transition probabilities extracted for all isomeric transitions in 208 Pb have been reviewed and discussed in terms of the intrinsic structure of the initial and final levels involved. Particular emphasis was placed on the many observed E3 transitions as they often exhibit significant enhancements in strength (of the order of tens of W.u.) comparable to the one seen for the neutron j 15/2 →g 9/2 E3 transition in 209 Pb. In this context, the enhancement of the 725-keV E3 transition (56 W.u.) associated with the decay of the highest-lying 28 -isomer observed in this work remains particularly challenging to explain. Large-scale shell-model calculations were performed with two approaches, a first one where the 1, 2, and 3 particle-hole excitations do not mix with one another, and another more complex one, in which such mixing takes place. The calculated levels were compared with the data and a general agreement is observed for most of the 208 Pb level scheme. At the highest spins and energies, however, the 2 correspondence between theory and experiment is less satisfactory and the experimental yrast line appears to be more regular than the calculated one. This regularity is notable when the level energies are plotted versus the I(I+1) product and the observed, nearly linear, behavior was considered within a simple "rotational" interpretation. Within this approximate picture, the extracted moment of inertia suggests that only the 76 valence nucleons participate in the "rotation" and that the 132 Sn spherical core remains inert. --------------------------

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Yrast structure of206Bi: Isomeric states and one-proton-particle, three-neutron-hole excitations

Cited by 19 publications

References 17 publications

Review of metastable states in heavy nuclei

Review of metastable states in heavy nuclei

Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in
Broda
¹
,
Iskra
²
,
Janssens
³

et al. 2018
Phys. Rev. C
Self Cite
17
0
3
1
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Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

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Yrast structure of206Bi: Isomeric states and one-proton-particle, three-neutron-hole excitations

Cited by 19 publications

References 17 publications

Review of metastable states in heavy nuclei

Review of metastable states in heavy nuclei

Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in Broda1, Iskra2, Janssens3 et al. 2018Phys. Rev. CSelf Cite17031View full textAdd to dashboardCite

Doubly magic Pb208 : High-spin states, isomers, and E3 collectivity in the yrast decay

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Two-neutron and core-excited states in Pb210 : Tracing E3 collectivity and evidence for a new β -decaying isomer in
Broda
¹
,
Iskra
²
,
Janssens
³

et al. 2018
Phys. Rev. C
Self Cite
17
0
3
1
View full text Add to dashboard Cite