New nuclide<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">Ha</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>263</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

Kratz, J. V.; Gober, M. K.; Zimmermann, H. P.; Schädel, M.; Brüchle, W.; Schimpf, E.; Gregorich, Κ. Ε.; Türler, Α.; Hannink, N. J.; Czerwinski, K. R.; Kadkhodayan, Β.; Lee, D. M.; Nurmia, M.; Hoffman, D.C.; Gäggeler, H. W.; Jost, D.T.; Kovacs, J.; Scherer, U. W.; Weber, Alfred P.

doi:10.1103/physrevc.45.1064

Cited by 66 publications

(64 citation 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: 75%

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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confidence: 75%

Properties of Group Five and Group Seven transactinium elements

Wilk

2001

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“…Hence, only a small fraction of the 330-d ^''^Bk had decayed into The calculated energy in the target was 98 to 99 MeV. At this bombarding energy the nuclides 2^^105 and "M05 from the 5n and 4n reaction Channels are produced with cross sections of 6 + 3 nb and 2 +1 nb, respectively [27]. ^^^05 has a half-Hfe of 34 s and decays by a-emission (67%) and by spontaneous fission (SF) (33%) [27,33].…”

Section: Methodsmentioning

confidence: 99%

“…At this bombarding energy the nuclides 2^^105 and "M05 from the 5n and 4n reaction Channels are produced with cross sections of 6 + 3 nb and 2 +1 nb, respectively [27]. ^^^05 has a half-Hfe of 34 s and decays by a-emission (67%) and by spontaneous fission (SF) (33%) [27,33]. "M05 has a half-life of 27 s and decays by a-emission (43%) and by SF (57%) [27].…”

Section: Methodsmentioning

confidence: 99%

“…^^^05 has a half-Hfe of 34 s and decays by a-emission (67%) and by spontaneous fission (SF) (33%) [27,33]. "M05 has a half-life of 27 s and decays by a-emission (43%) and by SF (57%) [27]. Hence, at our bombarding energy the total cross sections for production of a-decaying isotopes of element 105 is 4.9 nb, and that of SF decaying isotopes of element 105 is 3.1 nb.…”

Section: Methodsmentioning

confidence: 99%

“…These nuclides were most likely produced in nucleon transfer reactions between and a Pb contamination in the target. Unfortunately, the contamination was rather high and prevented a detection of the ^^^105 (8.45-8.67 MeV) [27,33] and ^^^los (8,35 MeV) [27] a-lines. The Bi and Po activities also obscured a-a correlation measurements with the corresponding Lr daughter nuclides.…”

Section: Direct Catch Experimentsmentioning

confidence: 99%

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Gas Phase Chromatography Experiments with Bromides of Tantalum and Element 105

et al. 1992

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Element 105 / Transition metal group V / Chemical properties / Bromides / Volatility / Gas chromatography AbstractThe retention behavior of volatile bromide molecules of shortlived isotopes of tantalum and element 105 in KCl coated quartz columns was studied using continuous isothermal gas chromatography. HBr and HBr saturated with BBrs vapor were used as reactive gases. The isotopes were produced in the fusion reactions ^°Ne+"" Eu and ^^O + ^^^Bk, respectively. The reaction producta were transported from the accelerator to the chromatography set-up with a gas-jet system using an aerosol with He as carrier gas and KCl as transporting particles. The measured retention times are compared to those of "'Nb bromides from a previous study. The retention times of niobium and tantalum bromides are very similar, in agreement with expectations based on the nearly identical Sublimation enthalpies of NbBrj and TaBr;. For the bromides of element 105, higher retention times are found, indicating a lower volatility of lOSBrs than of NbBrs and TaBrs. On the basis of empirical systematics, a Sublimation enthalpy of 138± 15 kJ/mol can be estimated for 105Br5 from the experimental data.

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Radioelements

2021

Nuclear and Radiochemistry

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New nuclideHa263

Cited by 66 publications

References 12 publications

Properties of Group Five and Group Seven transactinium elements

Properties of Group Five and Group Seven transactinium elements

Gas Phase Chromatography Experiments with Bromides of Tantalum and Element 105

Radioelements

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