Problem of “deformed” superheavy nuclei

Sobiczewski, A.; Muntian, I.; Patyk, Z.

doi:10.1103/physrevc.63.034306

Cited by 128 publications

(168 citation statements)

References 31 publications

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“…If such an isomer were indeed absent, or had a half life 6 orders of magnitude shorter than predicted, it would imply an abrupt shape change and, hence, termination at Z = 104 of a description which works remarkably well from Z = 92 -103. Such an abrupt termination would contradict theoretical predictions [9][10][11] and does not seem likely. The 5 − decay to the ground band would be relatively fast, < 4µs for f ν up to 600.…”

Section: Possibility That the 8 − 2-qp State Is Not Isomericmentioning

confidence: 45%

“…The inevitable consequence is that there is an abrupt termination in Rf at Z=104 of a description of a nucleus with axially-symmetric prolate deformation, which works remarkably well for nuclei from U to Lr (Z = 92 to 103). This interpretation is disfavored as it would contradict all predictions [9][10][11] based on different theoretical approaches and would involve a sudden breakdown of a highly successful model. [4,5], is almost a necessity.…”

Section: Discussionmentioning

confidence: 89%

“…This region extends from uranium (Z = 92) to lawrencium (Z = 103), with the β 2 deformation changing little (∆β 2 ∼ 0.02) from U to No. It is not unreasonable to expect that Rf (Z =104) nuclei would also be prolate, as predicted in all theoretical approaches [9][10][11]. The clustering of high-K orbitals near the Fermi level should give rise to isomers.…”

mentioning

confidence: 87%

“…We adopt the 'universal' WoodsSaxon potential [13], with deformation parameters β λ that minimize the ground-state energy [9,10]. Inclusion of high-order deformation terms up to at least β 6 is essential [31].…”

Section: General Approachmentioning

confidence: 99%

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Search for a 2-quasiparticle high-Kisomer inRf256

Robinson¹,

Khoo²,

Seweryniak³

et al. 2011

Phys. Rev. C

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The energies of 2-quasiparticle (qp) states in heavy shell-stabilized nuclei provide information on the single-particle states that are responsible for the stability of superheavy nuclei. We have calculated the energies of 2-qp states in 256 Rf, which suggest that a long-lived, low-energy 8 − isomer should exist. A search was conducted for this isomer through a calorimetric conversion electron signal, sandwiched in time between implantation of a 256 Rf nucleus and its fission decay, all within the same pixel of a double-sided Si strip detector. A 17(5) µs isomer was identified. However, its low population, ∼5(2)% that of the ground-state instead of the expected ∼30%, suggests that it is more likely a 4-qp isomer. Possible reasons for the absence of an electromagnetic signature of a 2-qp isomer decay are discussed. These include the favored possibility that the isomer decays by fission, with a half life indistinguishably close to that of the ground state. Another possibility, that there is no 2-qp isomer at all, would imply an abrupt termination of axially-symmetric deformed shapes at Z = 104, which describes nuclei with Z= 92 -103 very well.

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Section: Possibility That the 8 − 2-qp State Is Not Isomericmentioning

confidence: 45%

Section: Discussionmentioning

confidence: 89%

mentioning

confidence: 87%

Section: General Approachmentioning

confidence: 99%

See 2 more Smart Citations

Search for a 2-quasiparticle high-Kisomer inRf256

Robinson¹,

Khoo²,

Seweryniak³

et al. 2011

Phys. Rev. C

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“…Since effects of higher order shape multipoles, especially β 6 deformation, have been reported to be significant in this mass region [11], we performed cranked WoodsSaxon calculations with and without β 6 for these N = 151 isotones. The predicted alignment frequencies with and without β 6 deformation are compared to experimental data in Fig.…”

Section: N = 151 Nucleimentioning

confidence: 99%

Towards Superheavies: Spectroscopy of 94 < Z < 98, 150 < N < 154 Nuclei

et al. 2016

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Abstract. The heaviest nuclei where excitations above the ground state can be studied lie near Z ∼ 100. These nuclear structure studies are important testing grounds for theoretical models that aim to describe superheavy nuclei. To study the highest neutron orbitals (150 ≤ N ≤ 154), we have populated high angular momentum states in a series of Pu (Z = 94), Cm (Z = 96) and Cf (Z = 98) nuclei, via inelastic and transfer reactions, with heavy beams on long-lived radioactive actinide targets. Multiple collective excitation modes and structures were identified, and their configurations deduced. Quasiparticle alignments are mapped, with odd-A band structures helping identify specific orbital contributions via blocking arguments. Higher-order multipole shapes are observed to play a significant role in disentangling competing neutron and proton alignments. The N > 152 data provide new perspectives on physics beyond the N = 152 sub-shell gap.

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Chemie superschwerer Elemente

Schädel

2006

Angewandte Chemie

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In den letzten Jahrzehnten sind immer mehr neue chemische Elemente entdeckt worden. Dass die schwersten, künstlich erzeugten Elemente am Ende des Periodensystems im Gebiet der lang erwarteten superschweren Elemente liegen, macht dies besonders spannend. Derzeit kommen bei diesen Entdeckungen noch hauptsächlich rein physikalische Techniken zum Einsatz, chemische Methoden haben allerdings stark aufgeholt. Fortgeschrittene, hochempfindliche Techniken ermöglichen es, die chemischen Eigenschaften dieser schwer fassbaren Elemente zu untersuchen. Oft sind es insgesamt weniger als zehn kurzlebige Atome – jedes einzelne individuell chemisch abgetrennt (“one atom at a time”) –, die entscheidende Informationen über grundlegende chemische Eigenschaften liefern. Diese Ergebnisse ermöglichen es, den Aufbau des Periodensystems der Elemente an seinem Ende zu bestimmen und den Einfluss der zunehmend starken relativistischen Effekte auf die chemischen Eigenschaften zu untersuchen. Dieser Aufsatz beschreibt schwerpunktmäßig die experimentellen Arbeiten zur Chemie superschwerer Elemente. Er enthält einen kurzen Abriss der relativistischen Theorie und behandelt einige wichtige historische und nukleare Aspekte.

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Problem of “deformed” superheavy nuclei

Cited by 128 publications

References 31 publications

Search for a 2-quasiparticle high-Kisomer inRf256

Search for a 2-quasiparticle high-Kisomer inRf256

Towards Superheavies: Spectroscopy of 94 < Z < 98, 150 < N < 154 Nuclei

Chemie superschwerer Elemente

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