Discovery of Long-Lived Shape Isomeric States Which Decay by Strongly Retarded High-Energy Particle Radioactivity

Marinov, A.; Gelberg, S.; Kolb, D.

doi:10.1142/s0218301301000538

Cited by 11 publications

(35 citation statements)

References 23 publications

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“…In this context, while the results have been greeted with some skepticism, Marinov and colleagues (see for example Refs. [262,263,264,265,266]) have reported long-lived activities from both induced radioactivity and abundances of rare isotopes in nature that they attribute to the existence of very long-lived isomers produced in secondary minima (superderformed) and tertiary minima (hyperdeformed) in nuclear species ranging from the tungsten region, thorium and other heavy isotopes, and also in superheavy nuclei.…”

Section: Deformed Nuclei With a > 190: Extreme Shapes Fission And K 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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Section: Deformed Nuclei With a > 190: Extreme Shapes Fission And K mentioning

confidence: 99%

Review of metastable states in heavy nuclei

2016

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“…They are interpreted as belonging to the recently discovered class of long-lived high spin super-and hyperdeformed isomers.In recent years, long-lived high spin super-and hyperdeformed isomeric states with unusual radioactive decay properties have been discovered in heavy and very heavy nuclei [1][2][3][4] . This discovery motivated us to perform a search for naturally-occurring long-lived isomeric states.…”

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Existence of long-lived isomeric states in naturally-occurring neutron-deficient Th isotopes

Marinov

Rodushkin²,

Kashiv

et al. 2007

Phys. Rev. C

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Evidence for the existence of long-lived neutron-deficient isotopes has been found in a study of naturally-occurring Th using inductively coupled plasma-sector field mass spectrometry. They are interpreted as belonging to the recently discovered class of long-lived high spin super-and hyperdeformed isomers.In recent years, long-lived high spin super-and hyperdeformed isomeric states with unusual radioactive decay properties have been discovered in heavy and very heavy nuclei [1][2][3][4] . This discovery motivated us to perform a search for naturally-occurring long-lived isomeric states. (Up to now there is only one such isomeric state known, namely the 75.3 keV excited state in 180 Ta with a half-life of >1.2x10 15 y (ref. 5 )). Madagascan monazite and commercially available Th and U standard solutions were studied using different mass spectrometers, including an accelerator mass spectrometer. In the present paper we present the results obtained with pure Th standard solutions and also in one case with a monazite digest solution, using inductively coupled plasma-sector field mass spectrometer (ICP-SFMS).The instrument was an Element2 (Thermo-Electron, Bremen, Germany). The predefined medium resolution mode of m/∆m = 4000 (10% valley definition) was used throughout the experiments so as to separate atomic ions from interfering molecular ions with the same mass number. The sensitivityenhanced setup of the instrument was similar to that described in Ref.6 where a capacitive decoupling system and high-performance "X" skimmer were used, providing sensitivity for 232 16 O + peaks. Two 1000 mg l -1 Th stock solutions "A" and "B" from two manufacturers, Inorganic Venture and Customer Grade, were obtained from LGC Promochem AB (Borås, Sweden). Complete elemental screening was performed on both solutions to assess the impurity concentration levels PDF created with pdfFactory trial version www.pdffactory.com 2 The solutions were analyzed during three separate sessions: May 25, October 5, and November 6, 2005. A range of about 0.2 mass unit was scanned in each measured spectrum. This range was divided into approximately 60 channels. During the first session, masses from 210 to 269 were analyzed with an integration time per channel of 0.6 sec. During the second and third sessions, selected mass regions (where some indication of unidentified signals had been detected) were measured using an integration time per channel of 3 and 12 sec, respectively. Instrumental sensitivity varied significantly among runs as a result of matrix effects caused by the introduction of highly concentrated solutions into the ICP source. During the first session, the monazite digest (1000 mg monazite l -1 ) and Th solution A (diluted to 20 mg Th l -1 ) were scanned once. (The Th content in the monazite was approximately 2%. The contents of typical rare earth elements in it, like Ce, Dy and Er, were about 5%, 0.05% and 0.02%, respectively.) During the second session, 20 mg l -1 of Th A and B solutions spiked with 2 µg l -1 Bi were studied and eac...

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“…of 261 Rg [7] is predicted to be about 1 µs, it was concluded [2] that the observed nucleus is in an isomeric state, probably unrelated to high-spin states near closed shells, fission isomers or K-isomers at normal deformations. It is therefore hypothesized [2] that it belongs to a new class of high spin isomeric states in the SD or HD minimum of the nuclear potential energy [8][9][10]12]. This work also shows that it is possible to enrich Rg in purified Au by evaporating the Au in a vacuum at about 63 o C above its melting point.…”

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confidence: 66%

“…It was hypothesized that they may belong to a new class of high spin superdeformed (SD) or hyperdeformed (HD) isomeric states. Such isomeric states have been seen in 195 Hg [8], in 210 Fr [9,10] coincidence with γ-rays of SD bands [8,9].…”

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confidence: 70%

ENRICHMENT OF THE SUPERHEAVY ELEMENT ROENTGENIUM (Rg) IN NATURAL Au

Marinov

Pape

Kolb

et al. 2011

Int. J. Mod. Phys. E

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Based on the observation of the long-lived isotopes 261 Rg and 265 Rg (Z = 111, t 1/2 ≥ 10 8 y) in natural Au, an experiment was performed to enrich Rg in 99.999% Au. 16 mg of Au were heated in vacuum for two weeks at a temperature of 1127• C (63 • C above the melting point of Au). The content of 197 Au and 261 Rg in the residue was studied with high resolution inductively coupled plasma-sector field mass spectrometry (ICP-SFMS). The residue of Au was 3x10 −6 of its original quantity. The recovery of Rg was a few percent. The abundance of Rg compared to Au in the enriched solution was about 2x10 −6 , which is a three to four orders of magnitude enrichment. It is concluded that the evaporation rate of Rg from an Au matrix in vacuum at 63 o C above the Au melting point is lower than that of Au. This experiment reinforces our first observation of Rg in a terrestrial material. As before it is concluded that a long-lived isomeric state exists in 261 Rg and that it probably belongs to a new class of isomeric states, namely high spin super-or hyperdeformed isomeric states.

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Discovery of Long-Lived Shape Isomeric States Which Decay by Strongly Retarded High-Energy Particle Radioactivity

Cited by 11 publications

References 23 publications

Review of metastable states in heavy nuclei

Review of metastable states in heavy nuclei

Existence of long-lived isomeric states in naturally-occurring neutron-deficient Th isotopes

ENRICHMENT OF THE SUPERHEAVY ELEMENT ROENTGENIUM (Rg) IN NATURAL Au

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