Identification of a rotational band in the 240Pu fission isomer

Specht, H. J.; Weber, J.; Konecny, E.; Heunemann, D.

doi:10.1016/0370-2693(72)90363-2

Cited by 139 publications

(22 citation statements)

References 9 publications

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“…The model does not assume the existence of cluster structures: their formation proceeds from microscopic single-nucleon degrees of freedom via many-body correlations. The sideband based on the 0 + 2 state in 42 Ca seems to correspond to the [4,3]a configuration in Ref. [116], predicted to appear at about 1 MeV excitation energy and to have a transitional quadrupole moment Q t of about 1.5 e b[ a s compared to the experimental value of 1.13(10) e b].…”

Section: E Other Theoretical Approachesmentioning

confidence: 98%

“…Ten years later, the identification of a rotational band in the second minimum of the potential energy surface in 240 Pu [3] proved that fission isomers indeed correspond to highly deformed nuclear shapes. This conclusion was further reinforced by lifetime measurements resulting in typical values of the transitional quadrupole moment Q t ≈ 30 e b [4]forthe rotational states built on fission isomers, which corresponds to an axes ratio close to 2:1.…”

Section: Introductionmentioning

confidence: 99%

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Quadrupole collectivity in Ca42 from low-energy Coulomb excitation with AGATA

Hadyńska-Klęk¹,

Napiórkowski²,

Zielińska³

et al. 2018

Phys. Rev. C

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K. HADYŃSKA-KLȨK et al. PHYSICAL REVIEW C 97, 024326 (2018) A Coulomb-excitation experiment to study electromagnetic properties of 42 Ca was performed using a 170-MeV calcium beam from the TANDEM XPU facility at INFN Laboratori Nazionali di Legnaro. γ rays from excited states in 42 Ca were measured with the AGATA spectrometer. The magnitudes and relative signs of ten E2matrix elements coupling six low-lying states in 42 Ca, including the diagonal E2 matrix elements of 2 + 1 and 2 + 2 states, were determined using the least-squares code GOSIA. The obtained set of reduced E2 matrix elements was analyzed using the quadrupole sum rule method and yielded overall quadrupole deformation for 0 + 1,2 and 2 + 1,2 states, as well as triaxiality for 0 + 1,2 states, establishing the coexistence of a weakly deformed ground-state band and highly deformed slightly triaxial sideband in 42 Ca. The experimental results were compared with the state-of-the-art large-scale shell-model and beyond-mean-field calculations, which reproduce well the general picture of shape coexistence in 42 Ca.

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Section: E Other Theoretical Approachesmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Quadrupole collectivity in Ca42 from low-energy Coulomb excitation with AGATA

Hadyńska-Klęk¹,

Napiórkowski²,

Zielińska³

et al. 2018

Phys. Rev. C

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“…For example, the observed structures above the πh 11/2 isomers in odd-Z Re, Ir and Au isotopes [391,392,393, 394] and the νi 13/2 isomers in odd-N Pt and Hg nuclei [395,396,397,398,399, 400] allowed not only characterization of the structure of the isomers, but also revealed a unique interplay between competing shapecoexisting structures. Prompt radiations were also established above the α-decaying, multi-quasiparticle isomers in 151 Initially, fission tagging was applied in studies of superdeformed isomers in the second well, where a key milestone was the observation of conversion electrons from rotational states above the 4 ns, 240 Pu fission isomer [271,405]. Recent studies by means of α-decay and fission tagging were instrumental in discovering excited structures in very heavy nuclei [285,286,288].…”

Section: Recoil-decay Tagging and Related Techniquesmentioning

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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“…Their energies are determined by the moment of inertia that is increasing with increasing deformation. By the observation of the rotational band in the second minimum of 240 Pu, Specht et al [25] obtained a first qualitative hint for the fact that the nuclei in the fission isomeric state are more deformed than the ground state. The moment of inertia was more than a factor of 2 larger than that of the ground state.…”

Section: Nuclear Structure Of the Heaviest Elementsmentioning

confidence: 99%

The impact of the properties of the heaviest elements on the chemical and physical sciences

Kratz

2012

Radiochimica Acta

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Summary. The unique role of the heaviest elements in chemical and physical sciences is discussed. With the actinide series (Z = 90-103) and the superactinide series (Z = 122-155), the heaviest elements have significantly shaped the architecture of the Periodic Table of the elements. Relativistic effects in the electron shells of the heaviest elements change the chemical properties in a given group in a non-linear fashion. Relativistically stabilized sub-shell closures give rise to a new category of elements in the Periodic Table: volatile metals. The prototype for this property is element 114 which, due to the relativistic stabilization of its 7s 2 7 p 2 1/2 electron configuration, is volatile in its elementary state, but, in contrast to a noble gas, exhibits a marked metalmetal interaction with a gold surface at room temperature. Nuclear shell effects dominate the physical properties of the transuranium elements. These give rise to superdeformed shape isomers (fission isomers) in the actinides (U-Bk). Superheavy elements (Z ≥ 104) owe their existence solely to nuclear shell effects at N = 152, 162, and 184. At this time, a building lot is the location of the next spherical proton shell closure as there is evidence that the center of the "island of stability" is not at Z = 114. This needs urgently further theoretical and experimental efforts. The cross sections for the syntheses of elements 119 and 120 will give us important information on the "upper end of the Periodic Table of the elements".

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Identification of a rotational band in the 240Pu fission isomer

Cited by 139 publications

References 9 publications

Quadrupole collectivity in Ca42 from low-energy Coulomb excitation with AGATA

Quadrupole collectivity in Ca42 from low-energy Coulomb excitation with AGATA

Review of metastable states in heavy nuclei

The impact of the properties of the heaviest elements on the chemical and physical sciences

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