Yrast structure of the two-proton- and three-neutron-hole nucleus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mmultiscripts><mml:mi mathvariant="normal">Hg</mml:mi><mml:mprescripts /><mml:none /><mml:mrow><mml:mn>203</mml:mn></mml:mrow></mml:mmultiscripts></mml:math>from the decay of a<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>53</mml:mn><mml:mo>/</mml:mo><mml:msup><mml:mn>2</mml:mn><mml:mrow><mml:mo>+</mml:mo></mml:mrow></m

Szpak, B.; Maier, K. H.; Smolkowska, Aneta; Fornal, B.; Broda, R.; Carpenter, M. P.; Cieplicka, N.; Janssens, R. V. F.; Królas, W.; Pawłat, T.; Wrzesiński, J.; Zhu, S.

doi:10.1103/physrevc.83.064315

Cited by 22 publications

(19 citation statements)

References 33 publications

(24 reference statements)

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“…9(b) was instrumental in determining the half-life for the 10 + , 4895-keV isomer. The present value, T 1/2 = 0.57(5) μs, agrees well with the previous 0.50 (5) μs one [26], and the average value of 0.535(35) μs is adopted for later considerations.…”

Section: A Level Scheme Construction and Isomeric Statessupporting

confidence: 90%

“…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%

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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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Section: A Level Scheme Construction and Isomeric Statessupporting

confidence: 90%

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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“…These interactions are generally well understood from the study of two-particle multiplets [148,149,150,151,152,153,154]. The dependence of the interaction on the alignment of the angular momenta can be viewed semi-classically as a preference for co-planar orbits intended to maximise the overlap.…”

Section: Residual Interactions and The Empirical Shell Model (Esm)mentioning

confidence: 99%

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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“…Extensive compilations of interactions are available, including the theoretical values of Kuo and Herling [2] and various experimental values obtained from the study of multiplets in nuclei around 208 Pb that are augmented occasionally as more information becomes available (see, for example, Refs. [3][4][5][6], and references therein). Calculations can yield an accuracy of better than tens of keV (see, for example, Ref.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy and high-spin structure ofFr210: Isomerism and potential evidence for configuration mixing

et al. 2016

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The structure of 210 Fr has been established up to an excitation energy of ∼5.5 MeV and spins of ∼25 , via time-correlated γ-ray spectroscopy and using the 197 Au(18 O ,5n) 210 Fr reaction with pulsed beams at an energy of 97 MeV. A significantly different level scheme has been obtained compared to previous publications. Several isomers are reported here, including a J π = (23) + , τ = 686(9)-ns state at 4417 keV and a 10 − , 29.8(11)-ns state at 1113 keV. The former isomer has been associated with the π (h 3 9/2 i 2 13/2)ν(p −2 1/2 f −1 5/2) configuration and decays via proposed E3 transitions with strengths of 8.4(3) and 21.2(8) W.u. There are only very few known cases of a high-spin isomer decaying via two parallel E3 transitions. Indeed, this is not seen in other Fr nuclei, and consequently these strengths differ from related decays in the neighboring isotopes. However, by examining the systematics of E3 transitions in trans-lead nuclei, we suggest that the weaker of the two transitions decays to a mixed 20 − state. Systematics of the 10 − isomer are also discussed. Comparisons are made between the observed spectrum of states and those predicted from semiempirical shell-model calculations.

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Yrast structure of the two-proton- and three-neutron-hole nucleusHg203from the decay of a53/2+

Cited by 22 publications

References 33 publications

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

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

Review of metastable states in heavy nuclei

Spectroscopy and high-spin structure ofFr210: Isomerism and potential evidence for configuration mixing

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