Ground-State Band and Deformation of the<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="italic">Z</mml:mi><mml:mspace /><mml:mo>=</mml:mo><mml:mspace /><mml:mn>102</mml:mn><mml:mn /></mml:math>Isotope<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi>N</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>254</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:

Reiter, P.; Khoo, T. L.; Lister, C. J.; Seweryniak, D.; Ahmad, I.; Alcorta, M.; Carpenter, M. P.; Cizewski, J. A.; Davids, C. N.; Gervais, G.; Greene, J. P.; Henning, W.; Janssens, R. V. F.; Lauritsen, T.; Siem, S.; Sonzogni, A. A.; Sullivan, Donald; Uusitalo, J.; Wiedenhöver, I.; Amzal, N.; Butler, P. A.; Chewter, A. J.; Ding, K. Y.; Fotiades, N.; Fox, James D.; Greenlees, P. T.; Herzberg, R.‐D.; Jones, G.D.; Körten, W.; Leino, M.; Vetter, K.

doi:10.1103/physrevlett.82.509

Cited by 192 publications

(60 citation statements)

References 18 publications

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“…The latter is less demanding and thus allows even extensive studies of multidimensional fission landscapes. Although these models differ quantitatively, they agree in predicted topological properties as, e.g., the prolate deformed SH nuclei with Z = 100 − 112 and N≤ 170, which are confirmed experimentally for nuclei around 254 No [19] and spherical or oblate deformed systems with N= 174 − 184 (see [20,21]). …”

Section: Introductionsupporting

confidence: 65%

Fission barriers and probabilities of spontaneous fission for elements with Z≥ 100

et al. 2015

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This is a short review of methods and results of calculations of fission barriers and fission halflives of even-even superheavy nuclei. An approvable agreement of the following approaches is shown and discussed: The macroscopic-microscopic approach based on the stratagem of the shell correction to the liquid drop model and a vantage point of microscopic energy density functionals of Skyrme and Gogny type selfconsistently calculated within Hartree-Fock-Bogoliubov method. Mass parameters are calculated in the Hartree-Fock-Bogoliubov cranking approximation. A short part of the paper is devoted to the nuclear fission dynamics. We also discuss the predictive power of Skyrme functionals applied to key properties of the fission path of 266 Hs. It applies the standard techniques of error estimates in the framework of a χ 2 analysis.

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Section: Introductionsupporting

confidence: 65%

Fission barriers and probabilities of spontaneous fission for elements with Z≥ 100

et al. 2015

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“…For example, β 2 ≈ 0.27 has been derived for 254 No from the measured ground-state band [6]. The observation of K isomers with highly hindered decays in 254 No [7][8][9] points to an axially symmetric shape for the nucleus.…”

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confidence: 97%

“…The observation of upbending or backbending phenomena is usually associated with the alignment of high-j intruder orbitals. The spectroscopy experiments on transfermium nuclei provide a * hlliu@mail.xjtu.edu.cn testing ground for the theoretical models that are used to predict the properties of superheavy nuclei.Modern No [6,14]. Especially, the yrast spectrum of 254 No has been extended to spins of more than 20h because of the relatively high production rate.…”

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confidence: 99%

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Understanding the different rotational behaviors of252No and254No

2012

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Total Routhian surface calculations have been performed to investigate rapidly rotating transfermium nuclei, the heaviest nuclei accessible by detailed spectroscopy experiments. The observed fast alignment in 252 No and slow alignment in 254 No are well reproduced by the calculations incorporating high-order deformations. The different rotational behaviors of 252 No and 254 No can be understood for the first time in terms of β 6 deformation that decreases the energies of the νj 15/2 intruder orbitals below the N = 152 gap. Our investigations reveal the importance of high-order deformation in describing not only the multiquasiparticle states but also the rotational spectra, both providing probes of the single-particle structure concerning the expected doubly magic superheavy nuclei.DOI: 10.1103/PhysRevC.86.011301 PACS number(s): 21.10. Re, 21.60.Cs, 23.20.Lv, 27.90.+b Together with the exploration of nuclei far away from the stability line using radioactive nuclear beams, the synthesis of superheavy nuclei towards the predicted "island of stability" by fusion reactions is the focus of current research on atomic nuclei [1,2]. The occurrence of superheavy nuclei is due to the quantum shell effect (see, e.g., Ref. [3]) that overcomes the strong Coulomb repulsion between the large number of protons. The shell effect peaks at the expected doubly magic nucleus next after 208 Pb, the center of the stability island. Unfortunately, various theories give rise to different magic numbers, and available experiments have not been able to confirm or exclude any of them. Nevertheless, one can obtain single-particle information that is intimately related to the shell structure of superheavy nuclei from transfermium nuclei where γ -ray spectroscopy has been accessible for experiments [4,5].Transfermium nuclei have been found to be deformed. For example, β 2 ≈ 0.27 has been derived for 254 No from the measured ground-state band [6]. The observation of K isomers with highly hindered decays in 254 No [7][8][9] points to an axially symmetric shape for the nucleus. The deformation can bring the single-particle levels from the next shell across the predicted closure down to the Fermi surface. They play an active role in both nuclear noncollective and collective motions that in turn can serve as probes of the single-particle structure. For example, the observed K π = 3 + state formed by broken-pair excitation in 254 No is of special interest [7]. This is because the π 1/2 − [521] orbital occupied by one unpaired nucleon stems from the spherical orbital 2f 5/2 whose position relative to the spin-orbit partner 2f 7/2 determines whether Z = 114 is a magic number for the "island of stability." On the other hand, high-j intruder orbitals sensitively respond to the Coriolis force during collective rotation. The observation of upbending or backbending phenomena is usually associated with the alignment of high-j intruder orbitals. The spectroscopy experiments on transfermium nuclei provide a * hlliu@mail.xjtu.edu.cn testing ground for...

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“…However, since the first successful experiment to study in-beam spectroscopy of 254 No, produced in the 48 Ca( 208 Pb,2n) reaction with a cross section of 2-3 μb [5][6][7], the experimental infrastructure has continually upgraded to the point where the 12 nb cross section for the production of 256 Rf in the reaction of 50 Ti on 208 Pb is feasible for in-beam gamma spectroscopy.…”

Section: Introductionmentioning

confidence: 99%

Spectroscopy of actinide and transactinide nuclei

Herzberg¹,

Cox

2011

Radiochimica Acta

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Actinides / Transactinides / Gamma-ray spectroscopy / Conversion electron spectroscopy / In-beam spectroscopy / Recoil-decay-tagging / Decay spectroscopy / Rotational structure / Nilsson single-particle levels / Isomers / g-factors Summary. The role of isomers for nuclei with Z ≥ 100 is discussed. Recent advances in experimental instrumentation leading to combined in-beam gamma ray and conversion electron spectroscopy are discussed. The rotational spectra of nuclei with Z ≥ 94 and their moments of inertia are discussed. Examples for in-beam spectroscopy leading to the discovery and identification of isomers are given in 248,250 Fm. Here some attention is given to the assignment of nuclear configurations from g-factors measured via the branching ratios of coupled bands built on the isomers. A full list of the longest lived isomers in nuclei with Z ≥ 82 is given.

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Ground-State Band and Deformation of theZ=102IsotopeN254

Cited by 192 publications

References 18 publications

Fission barriers and probabilities of spontaneous fission for elements with Z≥ 100

Fission barriers and probabilities of spontaneous fission for elements with Z≥ 100

Understanding the different rotational behaviors of252No and254No

Spectroscopy of actinide and transactinide nuclei

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