Author
D.J. Henderson
Bio: D.J. Henderson is an academic researcher from Argonne National Laboratory. The author has contributed to research in topics: Decay scheme & Amine gas treating. The author has an hindex of 9, co-authored 10 publications receiving 368 citations.
Papers
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TL;DR: In this article, a half-life of 7.23hr was measured for compound nucleus reaction cross sections, and good agreement was obtained with the predictions of the Jackson model, and the ($d, n$) stripping cross sections are discussed briefly.
Abstract: Cross sections for the reactions ${\mathrm{Bi}}^{209}({\mathrm{He}}^{4}, 2n){\mathrm{At}}^{211}$, ${\mathrm{Bi}}^{209}({\mathrm{He}}^{4}, 3n){\mathrm{At}}^{210}$, and ${\mathrm{Bi}}^{209}({\mathrm{He}}^{4}, 4n){\mathrm{At}}^{209}$ were measured with helium ions of energies from 20.6 to 43.3 Mev. Cross sections for the reactions ${\mathrm{Bi}}^{209}(d, p)\mathrm{RaE}$, ${\mathrm{Bi}}^{209}(d, n){\mathrm{Po}}^{210}$, ${\mathrm{Bi}}^{209}(d, 2n){\mathrm{Po}}^{209}$, ${\mathrm{Bi}}^{209}(d, 3n){\mathrm{Po}}^{208}$, and ${\mathrm{Pb}}^{208}(d, p){\mathrm{Pb}}^{209}$ were measured with deuterons of energies from 6.3 to 21.5 Mev. Some information is presented on the ${\mathrm{Bi}}^{209}({\mathrm{He}}^{4}, t){\mathrm{Po}}^{210}$ reaction. A half-life of 7.23\ifmmode\pm\else\textpm\fi{}0.04 hr was measured for ${\mathrm{At}}^{211}$. The ${\mathrm{Bi}}^{209}(d, 3n){\mathrm{Po}}^{208}$ threshold energy is 12.0\ifmmode\pm\else\textpm\fi{}0.3 Mev (center-of-mass system). The compound nucleus reaction cross sections are compared with the predictions of the Jackson model, and good agreement is obtained. The ($d, n$) and ($d, p$) stripping cross sections are discussed briefly.
75 citations
TL;DR: In this article, the alpha half lives and energies of 148Gd, 150Gd and 148Sm were found and the half life of 148Sm is long enough so that it might be as high as 10-15 of normal Sm.
Abstract: Summary The alpha half lives and energies of 148Gd, 150Gd, and 148Sm are found to be: 148Gd 97.5 ± 6.5 yrs. 3.17 ± .02 MeV 150Gd 1.78 ± (.08) • 106 yrs. 2.7 ± .10 MeV 148Sm 1.026 ± (.048) • 108 yrs. 2.55 ± .03 MeV The half life of 148Sm is long enough so that it might be as high as 10-15 of normal Sm.
62 citations
TL;DR: The total half-lives of 252Cf, 250Cf and 253Cf are 2.646 ± 0.004 years, 13·2 ± 0·5 years and 17·6 ± 0 ·2 days as mentioned in this paper.
57 citations
TL;DR: In this article, the authors applied the extraction chromatography method to the separation of Es(III) and Fm(III), and the distribution coefficients of the separation factors were studied as a function of temperature with HDEHP adsorbed on Celite.
50 citations
TL;DR: In this paper, the effect of flow rate on the plate height was measured and compared for Cm(III), Am(III, Bk(II), Cf(III) and Es(III).
36 citations
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TL;DR: It is shown that 252Cf-PDMS is capable of producing mass spectra of quasi-molecular ions for a wide variety of compounds, including amino acids, moderately large peptides, nucleotides, and natural products.
Abstract: We have shown that 252Cf-PDMS is capable of producing mass spectra of quasi-molecular ions for a wide variety of compounds, including amino acids, moderately large peptides, nucleotides, and natural products. Positive and negative ion mass spectra can be obtained, and in many cases quasi-molecular ions are observed in both. The method is nondestructive, as only a relatively few molecules are used and samples can be recovered after the measurement is made. Fragmentation patterns are obtained which can yield structure information. The present sensitivity of the method is at the nanogram level and there are possibilities for reducing this to picograms. The mass resolution is sufficient to give elemental identification up to mass 500. This may be extended to higher masses with improved time-of-flight techniques. There are indications that 252Cf-PDMS may extend the mass range of molecules that can be studied to as high as 3000 or more.
532 citations
TL;DR: In this paper, a quaternary amine-based liquid anion exchanger was used for the extraction of actinides from nitric and hydrochloric acids, which exhibited preferential retention of tetravalent actinide over a wide range of acidities.
437 citations
TL;DR: In this article, the effect of coupling to direct reaction channels on elastic scattering and fusion is investigated, with the focus on halo nuclei, for which such effects are expected to be most important.
202 citations
TL;DR: New hydrophobic, tridentate nitrogen heterocyclic reagents (BATPs) such as 2,6-bis(5,5,8,8-tetramethyl-5,6,7,8 -tetrahydrobenzo[1,2,4]triazin-3-yl) pyridine (1) and 2, 6-bis (9,9,10,10-ten-tentetramerethyl-9, 10-dihydro-1, 2,4-triaza-
Abstract: New hydrophobic, tridentate nitrogen heterocyclic reagents (BATPs) such as 2,6-bis(5,5,8,8-tetramethyl-5,6,7,8-tetrahydrobenzo[1,2,4]triazin-3-yl) pyridine (1) and 2,6-bis(9,9,10,10-tetramethyl-9,10-dihydro-1,2,4-triaza-anthrane-3-yl) pyridine (2) have been studied. I is resistant to hydrolysis in 3 M nitric acid, whereas 2 is resistant to both acid hydrolysis and radiolysis. The molecules are able to give significantly enhanced separations of americium(III) from an excess of europium(III) in nitric acid. Typically, for 1 D-Am = 500 and SFAm,/Eu = 5000 compared with D-Am = 30 and SFAm /Eu = 400 with the reference molecule 2,6-bis(isopropyl[1,2,4]triazin-3-yl) pyridine (7). In order to increase the stability of 1 and 2, the labile alpha-benzylic hydrogens that are present in 7 have been replaced by alkyl groups. Three molecules of 1 are able to enclose completely the coordination sphere of the M(III) in the crystal structure of [Y(1)(3)][Y(NO3)(5)]center dot NO3 center dot 2.5H(2)O.
162 citations
TL;DR: In this paper, des different techniques d'ionisation for la spectrometrie de masse are presented, i.e., different techniques for different types of spectrometers.
Abstract: Presentation des differentes techniques d'ionisation pour la spectrometrie de masse. Mecanismes
157 citations