Discovery of Enhanced Nuclear Stability near the Deformed Shells<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>N</mml:mi><mml:mo>=</mml:mo><mml:mn>162</mml:mn><mml:mn /></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Z</mml:mi><mml:mo>=</mml:mo><mml:mn>108</mml:mn><mml:mn /></mml:math>

Lazarev, Yu. A.; Lobanov, Yu. V.; Oganessian, Yu. Ts.; Utyonkov, V. K.; Abdullin, F. Sh.; Buklanov, G. V.; Gikal, B. N.; Iliev, S.; Mezentsev, A. N.; Polyakov, A. N.; Sedykh, I.; Shirokovsky, I. V.; Subbotin, V. G.; Sukhov, A. M.; Tsyganov, Yu. S.; Zhuchko, V. E.; Lougheed, R. W.; Moody, K. J.; Wild, J. F.; Hulet, E.K.; McQuaid, J.H.

doi:10.1103/physrevlett.73.624

Cited by 179 publications

(38 citation statements)

References 12 publications

(8 reference statements)

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“…These reactions are also presented together with the SPIT predictions and the experimentally measured production cross sections in Table 5.2. Bh, respectively, are in agreement with the observed trends for 4n and 5n exit channels for analogous reactions [Kratz 1992, Lazarev 1994, Ghiorso 1970 Re would be also produced during bombardment, serving as a yield monitor for the chemical separation. The behavior of…”

supporting

confidence: 84%

Properties of Group Five and Group Seven transactinium elements

Wilk

2001

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The detection and positive identification of the short-lived, low cross section isotopes used in the chemical studies of the heaviest elements are usually accomplished by measuring their α-decay, thus the nuclear properties of the heaviest elements must be examined simultaneously with their chemical properties. The isotopes 224 Pa and 266,267 Bh have been studied extensively as an integral part of the investigation of the heaviest members of the groups five and seven of the periodic table.The half-life of 224 Pa was determined to be 855±19 ms by measuring its α-decay using our rotating wheel, solid state detector system at the Lawrence Berkeley National Laboratory 88-Inch Cyclotron. Protactinium was produced by bombardment of a bismuth target. New neutron rich isotopes, MeV.The chemical behavior of hahnium, Ha (element 105) was investigated using the fast on-line continuous liquid extraction and detection system SISAK-LISSY.Hahnium was not observed in this experiment following transport and extraction.Protactinium was used as on-line test of the apparatus to determine the experimental efficiency of the entire system. Unfortunately, the amount of protactinium observed after the extraction, compared to the amount produced, was extremely small, only 2.5%. The extraction of the protactinium test isotope indicated the efficiency of the apparatus was too low to observe the extraction of hahnium.The chemical behavior of oxychloride compounds of bohrium was investigated by isothermal gas adsorption chromatography in a quartz column at 180, 150, and 75°C. It was found to be less volatile than the corresponding compounds of the lighter group seven homologues, rhenium and technetium, which had been measured previously with the same apparatus. Assuming the bohrium compound to be BhO 3 Cl, the evaluated standard adsorption enthalpy, ∆H ads , of BhO 3 Cl on the quartz surface was calculated from Monte Carlo fits to the volatility data to be DedicationThis thesis is dedicated to the Reed Reactor Facility (RRF) of Reed College, Portland, Oregon and the Summer School in Nuclear Chemistry that was sponsored by the Division of Nuclear Chemistry and Technology of the American Chemical Society. These two institutions have maintained a commitment to undergraduate education in the field of nuclear chemistry that is unparalleled. It is my hope that Reed will soon replace the long missing radiochemistry professor of the chemistry department to echo this commitment to nuclear and radiochemistry. Without the education and the experience I received from the RRF and the contacts I made at the ACS summer school, I certainly would not be writing this thesis. No changes were made to the structure of the Periodic Table until 1944, when Glenn T. Seaborg postulated the existence of the actinide series, analogous to the lanthanide series (see Figure 1.1) [Seaborg 1945]. This seemingly simple extrapolation was not obvious given the data at the time, and led to the nearly immediate discovery of americium and curium. Before Seaborg's fo...

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supporting

confidence: 84%

Properties of Group Five and Group Seven transactinium elements

Wilk

2001

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“…The E 2+ energies and the p 2+ / p 0+ branching ratios have been calculated by Sobiczewski et al [27]. Lazarev et al [32], by reporting α-decay as the main decay mode and relatively long half-lives for the newly synthesized nuclides 265 Sg and 266 Sg. However, as will be discussed later in this paper, the reported discovery of 266 Sg was not correct.…”

Section: Rotational Statesmentioning

confidence: 99%

Nuclear structure and reaction studies near doubly magic ²⁷⁰Hs

Türler¹

2011

Ract

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Superheavy elements / Hassium / Nuclear structure / Reaction studiesSummary. Fast on-line gas chemical separations of Hs (hassium, element 108) in the form of HsO 4 were applied to investigate the reactions 26 Mg + 248 Cm and 36 S + 238 U. In an experiment at the gas-filled separator DGFRS the reaction 48 Ca + 226 Ra was studied. In all cases the product of complete nuclear fusion is 274 Hs * . For the first time, the new nuclide 270 Hs was produced in the 4n evaporation channel and its decay properties investigated. The nuclide 270 Hs was predicted by microscopic-macroscopic calculations to be a deformed doubly magic nucleus and its decay properties are therefore of special interest to theory. Also, much more detailed information was gained on the decay of 269 Hs and its daughters, which led to a new assignment of decay properties of the daughter nuclides 265 Sg and 261 Rf . There is evidence for isomeric states in 265 Sg and 261 Rf , while 266 Sg is not an alpha-particle emitter as believed previously, but decays by spontaneous fission (SF) with a rather short half-life. Also, interesting features of the used reaction 26 Mg + 248 Cm led to the discovery of the nucleus 271 Hs in the same experiments. An investigation of the influence of the Q-value on the fusion reaction in relation to the location of the fusion barrier showed, that the high binding energy of 48 Ca largely compensates for the lower fusion probability compared to more asymmetric reactions, while 36 S is not as promising as a projectile.

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“…Finally, in the mid 1990s, a large international collaboration of 16 institutes from nine countries performed the so far only series of Sg chemistry experiments at the GSI, Darmstadt, which yielded today's knowledge about Sg chemistry [108,[208][209][210][211][212]. First observed at the DGFRS by a Dubna-Livermore collaboration [213,214], 265 Sg was used in the Sg chemistry. Interpretation of a ≈ 20-s SF decay component, also observed in these experiments, to be 266 Sg was recently shown to originate from a short-lived isomeric decay in the 265 Sg daughter nucleus 261 Rf [79,215].…”

Section: Seaborgium (Sg Element 106)mentioning

confidence: 99%

Chemistry of superheavy elements

Schädel

2012

Radiochimica Acta

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Summary. The chemistry of superheavy elements -or transactinides from their position in the Periodic Table -is summarized. After giving an overview over historical developments, nuclear aspects about synthesis of neutron-rich isotopes of these elements, produced in hot-fusion reactions, and their nuclear decay properties are briefly mentioned. Specific requirements to cope with the one-atom-at-a-time situation in automated chemical separations and recent developments in aqueous-phase and gas-phase chemistry are presented. Exciting, current developments, first applications, and future prospects of chemical separations behind physical recoil separators ("pre-separator") are discussed in detail. The status of our current knowledge about the chemistry of rutherfordium (Rf, element 104), dubnium (Db, element 105), seaborgium (Sg, element 106), bohrium (Bh, element 107), hassium (Hs, element 108), copernicium (Cn, element 112), and element 114 is discussed from an experimental point of view. Recent results are emphasized and compared with empirical extrapolations and with fully-relativistic theoretical calculations, especially also under the aspect of the architecture of the Periodic Table.

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Discovery of Enhanced Nuclear Stability near the Deformed ShellsN=162andZ=108

Cited by 179 publications

References 12 publications

Properties of Group Five and Group Seven transactinium elements

Properties of Group Five and Group Seven transactinium elements

Nuclear structure and reaction studies near doubly magic ²⁷⁰Hs

Chemistry of superheavy elements

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Discovery of Enhanced Nuclear Stability near the Deformed ShellsN=162andZ=108

Cited by 179 publications

References 12 publications

Properties of Group Five and Group Seven transactinium elements

Properties of Group Five and Group Seven transactinium elements

Nuclear structure and reaction studies near doubly magic 270Hs

Chemistry of superheavy elements

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Nuclear structure and reaction studies near doubly magic ²⁷⁰Hs