225 results on '"Ortner, K."'
Search Results
2. Absence of Low-Energy Shape Coexistence in $^{80}$Ge: The Nonobservation of a Proposed Excited 0$_2^+$ Level at 639 keV
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Garcia, F. H., Andreoiu, C., Ball, G. C., Bell, A., Garnsworthy, A. B., Nowacki, F., Petrache, C. M., Poves, A., Whitmore, K., Ali, F. A., Bernier, N., Bhattacharjee, S. S., Bowry, M., Coleman, R. J., Dillmann, I., Djianto, I., Forney, A. M., Gascoine, M., Hackman, G., Leach, K. G., Murphy, A. N., Natzke, C. R., Olaizola, B., Ortner, K., Peters, E. E., Rajabali, M. M., Raymond, K., Svensson, C. E., Umashankar, R., Williams, J., and Yates, D.
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Nuclear Experiment - Abstract
The $^{80}$Ge structure was investigated in a high-statistics $\beta$-decay experiment of $^{80}$Ga using the GRIFFIN spectrometer at TRIUMF-ISAC through $\gamma$, $\beta$-$e$, $e$-$\gamma$ and $\gamma$-$\gamma$ spectroscopy. No evidence was found for the recently reported 0$_2^{+}$ 639-keV level suggested as evidence for low-energy shape coexistence in $^{80}$Ge. Large-scale shell model calculations performed in $^{78,80,82}$Ge place the $0^{+}_{2}$ level in $^{80}$Ge at 2\,MeV. The new experimental evidence combined with shell model predictions indicate that low-energy shape coexistence is not present in $^{80}$Ge.
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- 2020
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3. $\beta$ Decay of $^{132}$In and Spectroscopy of $^{132}$Sn and $^{131}$Sb with the GRIFFIN Spectrometer
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Whitmore, K., Andreoiu, C., Garcia, F. H., Ortner, K., Holt, J. D., Miyagi, T., Ball, G. C., Bernier, N., Bidaman, H., Bildstein, V., Bowry, M., Cross, D. S., Dunlop, M. R., Dunlop, R., Garnsworthy, A. B., Garrett, P. E., Henderson, J., Measures, J., Olaizola, B., Park, J., Petrache, C. M., Pore, J. L., Smith, J. K., Southall, D., Svensson, C. E., Ticu, M., Turko, J., and Zidar, T.
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Nuclear Experiment - Abstract
Spectroscopy of doubly magic $^{132}_{50}$Sn$_{82}$ has been performed with the GRIFFIN spectrometer at TRIUMF-ISAC following the $\beta$ decay of $^{132}_{49}$In$_{83}$. The analysis has allowed for the placement of a total of 70 transitions and 29 excited states in $^{132}$Sn. Detailed spectroscopy has also been performed on $^{131}$Sb, resulting from the $\beta$ decay of $^{131}$Sn, produced from the $\beta$-delayed neutron decay of $^{132}$In. Measurement of $\gamma$-rays in both $^{131}$Sn and $^{131}$Sb has led to the determination of the $\beta$-delayed neutron emission probability, $P_{n}$, from $^{132}$In. This is the first time the $P_{n}$ has been measured for this nucleus using $\gamma$ spectroscopy, and the new value of 12.3(4)% is consistent with the most recent $\beta-n$ counting experiment. Additionally, $\gamma$-$\gamma$ angular correlations have been performed in $^{132}$Sn, supporting the spin assignments of several excited states. Novel ab initio calculations are presented which describe several of the excited states, and these are compared to the experimental spectrum., Comment: 14 pages, 7 figures, to be published in Physical Review C
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- 2020
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4. Collective 2p-2h intruder states in $^{118}$Sn studied via $\beta$-decay of $^{118}$In using GRIFFIN
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Ortner, K., Andreoiu, C., Spieker, M., Ball, G. C., Bernier, N., Bidaman, H., Bildstein, V., Bowry, M., Cross, D. S., Dunlop, M. R., Dunlop, R., Garcia, F. H., Garnsworthy, A. B., Garrett, P. E., Henderson, J., Measures, J., Olaizola, B., Park, J., Petrache, C. M., Pore, J. L., Raymond, K., Smith, J. K., Southall, D., Svensson, C. E., Ticu, M., Turko, J., Whitmore, K., and Zidar, T.
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Nuclear Experiment - Abstract
The low-lying structure of semi-magic $^{118}$Sn has been investigated through the $\beta$-decay of $^{118}$In ($T_{1/2}=4.45$ min) to study shape coexistence via the reduced transition probabilities of states in the 2p-2h proton intruder band. This high-statistics study was carried out at TRIUMF-ISAC with the GRIFFIN spectrometer. In total, 99 transitions have been placed in the level scheme with 43 being newly observed. Three low-lying $\gamma$-ray transitions with energies near 285 keV have been resolved from which the 2$^+_{\mathrm{intr.}} \rightarrow 0^+_{\mathrm{intr.}}$ 284.52-keV transition was determined to have half of the previous branching fraction leading to a $B(E2;2^+_2\rightarrow 0^+_2)$ of 21(4) W.u. compared to 39(7) W.u. from the previous measurement. Calculations using $sd$ IBM-2 with mixing have also been made to compare the experimental $B(E2)$ values to the theoretical values and to make comparisons to the $^{114,116}$Sn isotopes previously studied using the same theoretical model.
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- 2020
5. Diversity of shapes and rotations in the gamma-soft 130Ba nucleus: first observation of a t-band in the A=130 mass region
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Petrache, C. M., Walker, P. M., Guo, S., Chen, Q. B., Frauendorf, S., Liu, Y. X., Wyss, R. A., Mengoni, D., Qiang, Y., Astier, A., Dupont, E., Li, R., Lv, B. F., Zheng, K. K., Bazzacco, D., Boso, A., Goasduff, A., Recchia, 8 F., Testov, D., Galtarossa, F., Jaworski, G., Napoli, D. R., Riccetto, S., Siciliano, M., Valiente-Dobon, J. J., Liu, M. L., Zhou, X. H., Wang, J. G., Andreoiu, C., Garcia, F. H., Ortner, K., Whitmore, K., Back, T., Cederwall, B., Lawrie, E. A., Kuti, I., Sohler, D., Timar, J., Marchlewski, T., Srebrny, J., and Tucholski, A.
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Nuclear Experiment ,Nuclear Theory - Abstract
Several new bands have been identified in 130Ba, among which there is one with band-head spin 8+. Its properties are in agreement with the Fermi-aligned \nu h11/2^2 , 7/2+[523] \otimes 9/2-[514] Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the A=130 mass region. The t-band is fed by a dipole band involving two additional h11/2 protons. The odd-spin partners of the proton and neutron S-bands and the ground-state band at high spins are also newly identified. The observed bands are discussed using several theoretical models, which strongly suggest the coexistence of prolate and oblate shapes polarized by rotation aligned two-proton and two-neutron configurations, as well as prolate collective rotations around axes with different orientations. With the new results, 130Ba presents one of the best and most complete sets of collective excitations that a gamma-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the A = 130 mass region., Comment: 8 pages, 7 figures
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- 2019
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6. $\beta$ and $\beta$-delayed neutron decay of the $N=82$ nucleus $^{131}_{~49}$In$_{82}$
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Dunlop, R., Svensson, C. E., Andreoiu, C., Ball, G. C., Bernier, N., Bidaman, H., Bildstein, V., Bowry, M., Cross, D. S., Dillmann, I., Dunlop, M. R., Garcia, F. H., Garnsworthy, A. B., Garrett, P. E., Hackman, G., Henderson, J., Measures, J., Mücher, D., Olaizola, B., Ortner, K., Park, J., Petrache, C. M., Pore, J. L., Smith, J. K., Southall, D., Ticu, M., Turko, J., Whitmore, K., and Zidar, T.
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Nuclear Experiment - Abstract
The half-lives of three $\beta$ decaying states of $^{131}_{~49}$In$_{82}$ have been measured with the GRIFFIN $\gamma$-ray spectrometer at the TRIUMF-ISAC facility to be $T_{1/2}(1/2^-)=328(15)$~ms, $T_{1/2}(9/2^+)=265(8)$~ms, and $T_{1/2}(21/2^+)=323(55)$~ms, respectively. The first observation of $\gamma$-rays following the $\beta n$ decay of $^{131}$In into $^{130}$Sn is reported. The $\beta$-delayed neutron emission probability is determined to be $P_{1n} = 12(7)\%$ for the $21/2^+$ state and $2.3(3)\%$ from the combined $1/2^-$ and $9/2^+$ states of $^{131}_{~49}$In$_{82}$ observed in this experiment. A significant expansion of the decay scheme of $^{131}$In, including 17 new excited states and 34 new $\gamma$-ray transitions in $^{131}_{~50}$Sn$_{81}$ is also reported. This leads to large changes in the deduced $\beta$ branching ratios to some of the low-lying states of $^{131}$Sn compared to previous work with implications for the strength of the first-forbidden $\beta$ transitions in the vicinity of doubly-magic $^{132}_{~50}$Sn$_{82}$., Comment: 14 pages, 15 figures, 5 tables
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- 2019
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7. Half-Lives of Neutron Rich $^{130}$Cd and $^{131}$In
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Dunlop, R., Svensson, C. E., Andreoiu, C., Ball, G. C., Bernier, N., Bildstein, V., Bidaman, H., Boubel, P., Burbadge, C., Caballero-Folch, R., Dillmann, I., Dunlop, M. R., Evitts, L. J., Garcia, F. H., Garnsworthy, A. B., Garrett, P. E., Hackman, G., Hallam, S., Henderson, J., Ilyushkin, S., Jungclaus, A., Krücken, R., Lassen, J., Li, R., MacConnachie, E., MacLean, A. D., McGee, E., Moukaddam, M., Mücher, D., Olaizola, B., Ortner, K., Padilla-Rodal, E., Park, J., Paetkau, O., Pore, J. L., Radich, A. J., Ruotsalainen, P., Smallcombe, J., Smith, J. K., Teigelhöfer, A., Turko, J., Whitmore, K., and Zidar, T.
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Nuclear Experiment - Abstract
The half-lives of isotopes around the $N=82$ shell closure are an important ingredient in astrophysical simulations and strongly influence the magnitude of the second $r$-process abundance peak in the $A\sim130$ region. The most neutron-rich $N=82$ nuclei are not accessible to the current generation of radioactive beam facilities and $r$-process simulations must therefore rely on calculations of the half-lives of the isotopes involved. Half-life measurements of the experimentally accessible nuclei in this region are important in order to benchmark these calculations. The half-life of $^{130}$Cd is particularly important as it is used to tune the Gamow-Teller quenching in shell-model calculations for the $\beta$ decay of other nuclei in this region. In this work, the GRIFFIN $\gamma$-ray spectrometer at the TRIUMF-ISAC facility was used to measure the half-life of $^{130}_{~48}$Cd$_{82}$ to be $T_{1/2}= 126(4)$ ms. In addition, the half-lives of the three $\beta$ decaying states of $^{131}_{~49}$In$_{82}$ were measured to be $T_{1/2}(1/2^-)=328(15)$ ms, $T_{1/2}(9/2^+)=265(8)$ ms, and $T_{1/2}(21/2^+)=323(50)$ ms, respectively, providing an important benchmark for half-life calculations in this region., Comment: Talk presented CIPANP2018. 9 pages, LaTeX, 5 pdf figures, 1 png figure
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- 2018
8. The GRIFFIN Facility for Decay-Spectroscopy Studies at TRIUMF-ISAC
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Garnsworthy, A. B., Svensson, C. E., Bowry, M., Dunlop, R., MacLean, A. D., Olaizola, B., Smith, J. K., Ali, F. A., Andreoiu, C., Ash, J. E., Ashfield, W. H., Ball, G. C., Ballast, T., Bartlett, C., Beadle, Z., Bender, P. C., Bernier, N., Bhattacharjee, S. S., Bidaman, H., Bildstein, V., Bishop, D., Boubel, P., Braid, R., Brennan, D., Bruhn, T., Burbadge, C., Cheeseman, A., Chester, A., Churchman, R., Ciccone, S., Caballero-Folch, R., Cross, D. S., Cruz, S., Davids, B., Varela, A. Diaz, Dillmann, I., Dunlop, M. R., Evitts, L. J., Garcia, F. H., Garrett, P. E., Georges, S., Gillespie, S., Gudapati, R., Hackman, G., Hadinia, B., Hallam, S., Henderson, J., Ilyushkin, S. V., Jigmeddorj, B., Kilic, A. I., Kisliuk, D., Kokke, R., Kuhn, K., Kruecken, R., Kuwabara, M., Laffoley, A. T., Lafleur, R., Leach, K. G., Leslie, J. R., Linn, Y., Lim, C., MacConnachie, E., Mathews, A. R., McGee, E., Measures, J., Miller, D., Mills, W. J., Moore, W., Morris, D., Morrison, L. N., Moukaddam, M., Natzke, C. R., Ortner, K., Padilla-Rodal, E., Paetkau, O., Park, J., Patel, H. P., Pearson, C. J., Peters, E., Peters, E. E., Pore, J. L., Radich, A. J., Rajabali, M. M., Rand, E. T., Raymond, K., Rizwan, U., Ruotsalainen, P., Saito, Y., Sarazin, F., Shaw, B., Smallcombe, J., Southall, D., Starosta, K., Ticu, M., Timakova, E., Turko, J., Umashankar, R., Unsworth, C., Wang, Z. M., Whitmore, K., Wong, S., Yates, S. W., Zganjar, E. F., and Zidar, T.
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Physics - Instrumentation and Detectors ,Nuclear Experiment - Abstract
Gamma-Ray Infrastructure For Fundamental Investigations of Nuclei, GRIFFIN, is a new high-efficiency $\gamma$-ray spectrometer designed for use in decay spectroscopy experiments with low-energy radioactive ion beams provided by TRIUMF's Isotope Separator and Accelerator (ISAC-I) facility. GRIFFIN is composed of sixteen Compton-suppressed large-volume clover-type high-purity germanium (HPGe) $\gamma$-ray detectors combined with a suite of ancillary detection systems and coupled to a custom digital data acquisition system. The infrastructure and detectors of the spectrometer as well as the performance characteristics and the analysis techniques applied to the experimental data are described.
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- 2018
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9. The GRIFFIN facility for Decay-Spectroscopy studies at TRIUMF-ISAC
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Garnsworthy, A.B., Svensson, C.E., Bowry, M., Dunlop, R., MacLean, A.D., Olaizola, B., Smith, J.K., Ali, F.A., Andreoiu, C., Ash, J.E., Ashfield, W.H., Ball, G.C., Ballast, T., Bartlett, C., Beadle, Z., Bender, P.C., Bernier, N., Bhattacharjee, S.S., Bidaman, H., Bildstein, V., Bishop, D., Boubel, P., Braid, R., Brennan, D., Bruhn, T., Burbadge, C., Cheeseman, A., Chester, A., Churchman, R., Ciccone, S., Caballero-Folch, R., Cross, D.S., Cruz, S., Davids, B., Varela, A. Diaz, Dillmann, I., Dunlop, M.R., Evitts, L.J., Garcia, F.H., Garrett, P.E., Georges, S., Gillespie, S., Gudapati, R., Hackman, G., Hadinia, B., Hallam, S., Henderson, J., Ilyushkin, S.V., Jigmeddorj, B., Kilic, A.I., Kisliuk, D., Kokke, R., Kuhn, K., Krücken, R., Kuwabara, M., Laffoley, A.T., Lafleur, R., Leach, K.G., Leslie, J.R., Linn, Y., Lim, C., MacConnachie, E., Mathews, A.R., McGee, E., Measures, J., Miller, D., Mills, W.J., Moore, W., Morris, D., Morrison, L.N., Moukaddam, M., Natzke, C.R., Ortner, K., Padilla-Rodal, E., Paetkau, O., Park, J., Patel, H.P., Pearson, C.J., Peters, E., Peters, E.E., Pore, J.L., Radich, A.J., Rajabali, M.M., Rand, E.T., Raymond, K., Rizwan, U., Ruotsalainen, P., Saito, Y., Sarazin, F., Shaw, B., Smallcombe, J., Southall, D., Starosta, K., Ticu, M., Timakova, E., Turko, J., Umashankar, R., Unsworth, C., Wang, Z.M., Whitmore, K., Wong, S., Yates, S.W., Zganjar, E.F., and Zidar, T.
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- 2019
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10. Microstructure of gas flow sputtered thermal barrier coatings: Influence of bias voltage
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Rösemann, N., Ortner, K., Petersen, J., Bäker, M., Bräuer, G., and Rösler, J.
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- 2017
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11. Influence of substrate temperature on morphology and behavior under cyclic thermal load of gas flow sputtered zirconia coatings
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Rösemann, N., Ortner, K., Petersen, J., Stöwer, M., Bäker, M., Bräuer, G., and Rösler, J.
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- 2017
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12. Gas flow sputtering for manufacture of high quality hard magnetic films
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Bandorf, R., Gröninger, A., Ortner, K., Gerdes, H., and Bräuer, G.
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- 2017
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13. First Report of a Doublet 2209-keV State in \(^{100}\)Zr
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Kalaydjieva, D., primary, Garrett, P.E., additional, Bidaman, H., additional, Rocchini, M., additional, Zielińska, M., additional, Korten, W., additional, Bildstein, V., additional, Pannu, S., additional, Ahmed, Z., additional, Andreoiu, C., additional, Annen, D., additional, Ball, G.C., additional, Benzoni, G., additional, Bhattacharjee, S.S., additional, Buck, S., additional, Coleman, R.J., additional, Devinyak, S., additional, Dillmann, I., additional, Caballero-Folch, R., additional, Garcia, F.H., additional, Garnsworthy, A.B., additional, Greaves, B., additional, Griffin, C.J., additional, Grinyer, G.F., additional, Gyabeng Fuakye, E., additional, Hackman, G., additional, Hymers, D., additional, Kanungo, R., additional, Kapoor, K., additional, Kasanda, E., additional, Marchini, N., additional, Mashtakov, K.M., additional, Nannini, A., additional, Natzke, C., additional, Olaizola, B., additional, Ortner, K., additional, Petrache, C.M., additional, Polettini, M., additional, Radich, A.J., additional, Saei, N., additional, Satrazani, M., additional, Siciliano, M., additional, Singh, M., additional, Spagnoletti, P., additional, Svensson, C.E., additional, Torres, D.A., additional, Umashankar, R., additional, Vedia, V., additional, and Zidar, T., additional
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- 2023
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14. Advances at TRIUMF-ISAC and decay of neutron-rich Cd studied with GRIFFIN
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Garrett P.E., Bernier N., Dunlop R., MacLean A.D., Bildstein V., Dillmann I., Jungclaus A., Svensson C.E., Andreoiu C., Ball G.C., Bidaman H., Boubel P., Burbadge C., Caballero-Folch R., Dunlop M.R., Evitts L.J., Garcia F., Garnsworthy A.B., Hackman G., Hallam S., Henderson J., Ilyushkin S., Kisliuk D., Krücken R., Lassen J., Li R., MacConnachie E., McGee E., Moukaddam M., Olaizola B., Ortner K., Padilla-Rodal E., Park J., Paetkau O., Petrache C.M., Pore J.L., Radich A.J., Ruotsalainen P., Smallcombe J., Smith J.K., Tabor S.L., Teigelhöfer A., Turko J., Whitmore K., and Zidar T.
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Physics ,QC1-999 - Abstract
The β-decay half lives of nuclei near the r-process path are critical information required for abundance calculations, especially those near neutron number N = 82. Specifically, the nuclei below doubly-magic 132Sn are key, and play an important role in the formation and shape of the second r-process abundance peak. The half lives in this region are challenging to measure due to the significant β-delayed neutron decay branches and the population of isomeric states with half lives comparable to the ground states. However, by measuring the time distribution of γ rays, these complications can be eliminated. This requires, however, a very effcient γ-ray spectrometer since the production of isotopes in this region is very limited. The new GRIFFIN array at TRIUMF-ISAC provides the high effciency required for these measurements. Recent improvements in the quality of the beams produced at TRIUMF, employing the IG-LIS device, are outlined, as well as the current status of the ARIEL facility. The GRIFFIN spectrometer and its use are briefly described. The experiment to measure the half lives of 128-130Cd is outlined and the results given, and some examples of the power of GRIFFIN to expand decay schemes, specifically for the decay of 128Cd to 128In, are given.
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- 2018
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15. Signature splitting of the g7/2[404]7/2+ bands in Ba131 and Ce133
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Ding, B., primary, Petrache, C. M., additional, Guo, S., additional, Lawrie, E. A., additional, Wakudyanaye, I., additional, Zhang, Z. H., additional, Wang, H. L., additional, Meng, H. Y., additional, Mengoni, D., additional, Qiang, Y. H., additional, Wang, J. G., additional, Andreoiu, C., additional, Astier, A., additional, Avaa, A., additional, Bäck, T., additional, Bark, R. A., additional, Bazzacco, D., additional, Boso, A., additional, Bucher, T. D., additional, Cederwall, B., additional, Chisapi, M. V., additional, Fan, H. L., additional, Galtarossa, F., additional, Garcia, F. H., additional, Goasduff, A., additional, Jaworski, G., additional, Jones, P., additional, Kuti, I., additional, Lawrie, J. J., additional, Li, G. S., additional, Li, R., additional, Liu, M. L., additional, Liu, Z., additional, Lomberg, B., additional, Lv, B. F., additional, Marchlewski, T., additional, Mdletshe, L., additional, Msebi, L., additional, Mthembu, S. H., additional, Napoli, D. R., additional, Netshiya, A., additional, Nkalanga, M. F., additional, Orce, J. N., additional, Ortner, K., additional, Recchia, F., additional, Riccetto, S., additional, Rohilla, A., additional, Seakamela, T. W., additional, Siciliano, M., additional, Sithole, M. A., additional, Sohler, D., additional, Srebrny, J., additional, Testov, D., additional, Tucholski, A., additional, Valiente-Dobón, J. J., additional, Wentzel, F., additional, Whitmore, K., additional, Zhang, Y. H., additional, Zheng, K. K., additional, Zhou, X. H., additional, and Zikhali, B. R., additional
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- 2021
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16. Capillary electrokinetic chromatography of insulin and related synthetic analogues
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Ortner, K., Buchberger, W., and Himmelsbach, M.
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- 2009
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17. Signature splitting of the ${g}_{7/2}[404]{7/2}^{+}$ bands in $^{131}\mathrm{Ba}$ and $^{133}\mathrm{Ce}$
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Ding, B., Petrache, C.M., Guo, S., Lawrie, E.A., Wakudyanaye, I., Zhang, Z.H., Wang, H.L., Meng, H.Y., Mengoni, D., Qiang, Y.H., Wang, J.G., Andreoiu, C., Astier, A., Avaa, A., Bäck, T., Bark, R.A., Bazzacco, D., Boso, A., Bucher, T.D., Cederwall, B., Chisapi, M.V., Fan, H.L., Galtarossa, F., Garcia, F.H., Goasduff, A., Jaworski, G., Jones, P., Kuti, I., Lawrie, J.J., Li, G.S., Li, R., Liu, M.L., Liu, Z., Lomberg, B., Lv, B.F., Marchlewski, T., Mdletshe, L., Msebi, L., Mthembu, S.H., Napoli, D.R., Netshiya, A., Nkalanga, M.F., Orce, J.N., Ortner, K., Recchia, F., Riccetto, S., Rohilla, A., Seakamela, T.W., Siciliano, M., Sithole, M.A., Sohler, D., Srebrny, J., Testov, D., Tucholski, A., Valiente-Dobón, J.J., Wentzel, F., Whitmore, K., Zhang, Y.H., Zheng, K.K., Zhou, X.H., Zikhali, B.R., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
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[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] - Abstract
International audience; Excited states in Ba131 and Ce133 were studied using in-beam γ-ray spectroscopy through the Sn122(C13,4n)Ba131 and Te125(C12,4n)Ce133 reactions, respectively. A strongly coupled band, associated with the νg7/2[404]7/2+ configuration, was identified in Ba131 and Ce133. It is the first time to observe the νg7/2[404]7/2+ bands in the N=75 isotones. The signature partners exhibit considerable energy splitting in comparison with those in the πg7/2[404]7/2+ bands in the odd-A Ta and Re isotopes. Extensive cranked shell model and quasiparticle-plus-triaxial-rotor model calculations reveal the origin of the signature splitting, which depends not only on the triaxiality, but also on the configuration mixing with nearby low-j orbitals.
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- 2021
18. Spectroscopic studies of neutron-rich $^{129}$In and its $\beta$-decay daughter, $^{129}$Sn, using the GRIFFIN spectrometer
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Garcia, F.H., Andreoiu, C., Ball, G.C., Bernier, N., Bidaman, H., Bildstein, V., Bowry, M., Cross, D.S., Dunlop, M.R., Dunlop, R., Garnsworthy, A.B., Garrett, P.E., Henderson, J., Measures, J., Olaizola, B., Ortner, K., Park, J., Petrache, C.M., Pore, J.L., Raymond, K., Smith, J.K., Southall, D., Svensson, C.E., Ticu, M., Turko, J., Whitmore, K., Zidar, T., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and GRIFFIN
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[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Structure ,Nuclear Experiment - Abstract
The $\beta$-decay of neutron-rich $^{129}$In into $^{129}$Sn was studied using the GRIFFIN spectrometer at the ISAC facility at TRIUMF. The study observed the half-lives of the ground state and each of the $\beta$-decaying isomers. The level scheme of $^{129}$Sn has been expanded with thirty-one new $\gamma$-ray transitions and nine new excited levels, leading to a re-evaluation of the $\beta$-branching ratios and level spin assignments. The observation of the $\beta$-decay of the (29/2$^{+}$) 1911-keV isomeric state in $^{129}$In is reported for the first time, with a branching ratio of 2.0(5)$\%$.
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- 2021
19. Evidence for pseudospin-chiral quartet bands in the presence of octupole correlations
- Author
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Guo, S., Petrache, C.M., Mengoni, D., Qiang, Y.H., Wang, Y.P., Wang, Y.Y., Meng, J., Wang, Y.K., Zhang, S.Q., Zhao, P.W., Astier, A., Wang, J.G., Fan, H.L., Dupont, E., Lv, B.F., Bazzacco, D., Boso, A., Goasduff, A., Recchia, F., Testov, D., Galtarossa, F., Jaworski, G., Napoli, D.R., Riccetto, S., Siciliano, M., Valiente-Dobon, J.J., Liu, M.L., Li, G.S., Zhou, X.H., Zhang, Y.H., Andreoiu, C., Garcia, F.H., Ortner, K., Whitmore, K., Ataç-Nyberg, A., Bäck, T., Cederwall, B., Lawrie, E.A., Kuti, I., Sohler, D., Marchlewski, T., Srebrny, J., and Tucholski, A.
- Published
- 2020
- Full Text
- View/download PDF
20. Pseudospin partner bands in $^{130}\mathrm{Ba}$
- Author
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Guo, S., Petrache, C.M., Mengoni, D., Liu, Y.X., Chen, Q.B., Qiang, Y.H., Astier, A., Dupont, E., Zheng, K.K., Wang, J.G., Ding, B., Lv, B.F., Liu, M.L., Fang, Y.D., Zhou, X.H., Bazzacco, D., Boso, A., Goasduff, A., Recchia, F., Testov, D., Galtarossa, F., Jaworski, G., Napoli, D.R., Riccetto, S., Siciliano, M., Valiente-Dobon, J.J., Andreoiu, C., Garcia, F.H., Ortner, K., Whitmore, K., Cederwall, B., Lawrie, E.A., Kuti, I., Sohler, D., Marchlewski, T., Srebrny, J., Tucholski, A., Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
- Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Structure - Abstract
International audience; The high-spin states in Ba130 have been investigated using the Sn122(C13,5n) reaction and the GALILEO array coupled to the EUCLIDES and Neutron Wall ancillary detectors. The level scheme has been extended to an excitation energy of ≈12 MeV and spin 28. Two sets of pseudospin partner bands have been identified built on πh11/2(g7/2,d5/2) and νh11/2(s1/2,d3/2) configurations. The assignments are supported by calculations using the projected shell model and the particle rotor model.
- Published
- 2020
21. Absence of Low-Energy Shape Coexistence in $^{80}\mathrm{Ge}$: The Nonobservation of a Proposed Excited ${0}_{2}^{+}$ Level at 639 keV
- Author
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Garcia, F. H., Andreoiu, C., Ball, G. C., Bell, A., Garnsworthy, A. B., Nowacki, F., Petrache, C. M., Poves, A., Whitmore, K., Ali, F. A., Bernier, N., Bhattacharjee, S. S., Bowry, M., Coleman, R. J., Dillmann, I., Djianto, I., Forney, A. M., Gascoine, M., Hackman, G., Leach, K. G., Murphy, A. N., Natzke, C. R., Olaizola, B., Ortner, K., Peters, E. E., Rajabali, M. M., Raymond, K., Svensson, C. E., Umashankar, R., Williams, J., Yates, D., Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)
- Subjects
FOS: Physical sciences ,Nuclear Experiment (nucl-ex) ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment ,Nuclear Physics - Abstract
The $^{80}$Ge structure was investigated in a high-statistics $\beta$-decay experiment of $^{80}$Ga using the GRIFFIN spectrometer at TRIUMF-ISAC through $\gamma$, $\beta$-$e$, $e$-$\gamma$ and $\gamma$-$\gamma$ spectroscopy. No evidence was found for the recently reported 0$_2^{+}$ 639-keV level suggested as evidence for low-energy shape coexistence in $^{80}$Ge. Large-scale shell model calculations performed in $^{78,80,82}$Ge place the $0^{+}_{2}$ level in $^{80}$Ge at 2\,MeV. The new experimental evidence combined with shell model predictions indicate that low-energy shape coexistence is not present in $^{80}$Ge.
- Published
- 2020
22. Very Large Rashba Spin–Orbit Splitting in HgTe Quantum Wells
- Author
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Becker, C. R., Zhang, X. C., Pfeuffer-Jeschke, A., Ortner, K., Hock, V., Landwehr, G., and Molenkamp, L. W.
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- 2003
- Full Text
- View/download PDF
23. Carrier-Density Dependence of Faraday Rotation and Spin Splitting in Cd1−x Mn x Te
- Author
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Rönnburg, K. E., Mohler, E., Roskos, H. G., Ortner, K., Becker, C. R., and Molenkamp, L. W.
- Published
- 2003
- Full Text
- View/download PDF
24. Absence of Low-Energy Shape Coexistence in Ge80 : The Nonobservation of a Proposed Excited 02+ Level at 639 keV
- Author
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Garcia, F. H., primary, Andreoiu, C., additional, Ball, G. C., additional, Bell, A., additional, Garnsworthy, A. B., additional, Nowacki, F., additional, Petrache, C. M., additional, Poves, A., additional, Whitmore, K., additional, Ali, F. A., additional, Bernier, N., additional, Bhattacharjee, S. S., additional, Bowry, M., additional, Coleman, R. J., additional, Dillmann, I., additional, Djianto, I., additional, Forney, A. M., additional, Gascoine, M., additional, Hackman, G., additional, Leach, K. G., additional, Murphy, A. N., additional, Natzke, C. R., additional, Olaizola, B., additional, Ortner, K., additional, Peters, E. E., additional, Rajabali, M. M., additional, Raymond, K., additional, Svensson, C. E., additional, Umashankar, R., additional, Williams, J., additional, and Yates, D., additional
- Published
- 2020
- Full Text
- View/download PDF
25. Pseudospin partner bands in Ba130
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Guo, S., primary, Petrache, C. M., additional, Mengoni, D., additional, Liu, Y. X., additional, Chen, Q. B., additional, Qiang, Y. H., additional, Astier, A., additional, Dupont, E., additional, Zheng, K. K., additional, Wang, J. G., additional, Ding, B., additional, Lv, B. F., additional, Liu, M. L., additional, Fang, Y. D., additional, Zhou, X. H., additional, Bazzacco, D., additional, Boso, A., additional, Goasduff, A., additional, Recchia, F., additional, Testov, D., additional, Galtarossa, F., additional, Jaworski, G., additional, Napoli, D. R., additional, Riccetto, S., additional, Siciliano, M., additional, Valiente-Dobon, J. J., additional, Andreoiu, C., additional, Garcia, F. H., additional, Ortner, K., additional, Whitmore, K., additional, Cederwall, B., additional, Lawrie, E. A., additional, Kuti, I., additional, Sohler, D., additional, Marchlewski, T., additional, Srebrny, J., additional, and Tucholski, A., additional
- Published
- 2020
- Full Text
- View/download PDF
26. β decay of In132 and spectroscopy of Sn132 and Sb131 with the GRIFFIN spectrometer
- Author
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Whitmore, K., primary, Andreoiu, C., additional, Garcia, F. H., additional, Ortner, K., additional, Holt, J. D., additional, Miyagi, T., additional, Ball, G. C., additional, Bernier, N., additional, Bidaman, H., additional, Bildstein, V., additional, Bowry, M., additional, Cross, D. S., additional, Dunlop, M. R., additional, Dunlop, R., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Henderson, J., additional, Measures, J., additional, Olaizola, B., additional, Park, J., additional, Petrache, C. M., additional, Pore, J. L., additional, Smith, J. K., additional, Southall, D., additional, Svensson, C. E., additional, Ticu, M., additional, Turko, J., additional, and Zidar, T., additional
- Published
- 2020
- Full Text
- View/download PDF
27. Collective 2p-2h intruder states in Sn118 studied via β decay of In118 using the GRIFFIN spectrometer at TRIUMF
- Author
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Ortner, K., primary, Andreoiu, C., additional, Spieker, M., additional, Ball, G. C., additional, Bernier, N., additional, Bidaman, H., additional, Bildstein, V., additional, Bowry, M., additional, Cross, D. S., additional, Dunlop, M. R., additional, Dunlop, R., additional, Garcia, F. H., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Henderson, J., additional, Measures, J., additional, Olaizola, B., additional, Park, J., additional, Petrache, C. M., additional, Pore, J. L., additional, Raymond, K., additional, Smith, J. K., additional, Southall, D., additional, Svensson, C. E., additional, Ticu, M., additional, Turko, J., additional, Whitmore, K., additional, and Zidar, T., additional
- Published
- 2020
- Full Text
- View/download PDF
28. Dynamic PACVD coating of strip metal with silicon oxide, titanium oxide and amorphous carbon films
- Author
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Ortner, K., Jung, T., Klages, C.-P., Linder, B., Strauss, B., and Sämann, N.
- Published
- 2005
- Full Text
- View/download PDF
29. Diversity of shapes and rotations in the -soft Ba nucleus: First observation of a -band in the = 130 Mass Region
- Author
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Petrache, C.M., Walker, P.M., Guo, S., Chen, Q.B., Frauendorf, S., Liu, Y.X., Wyss, R.A., Mengoni, D., Qiang, Y.H., Astier, A., Dupont, E., Li, R., Lv, B.F., Zheng, K.K., Bazzacco, D., Boso, A., Goasduff, A., Recchia, F., Testov, D., Galtarossa, F., Jaworski, G., Napoli, D.R., Riccetto, S., Siciliano, M., Valiente-Dobon, J.J., Liu, M.L., Zhou, X.H., Wang, J.G., Andreoiu, C., Garcia, F.H., Ortner, K., Whitmore, K., Bäck, T., Cederwall, B., Lawrie, E.A., Kuti, I., Sohler, D., Timár, J., Marchlewski, T., Srebrny, J., and Tucholski, A.
- Abstract
Several new bands have been identified in $^{130}$Ba, among which there is one with band-head spin 8+. Its properties are in agreement with the Fermi-aligned νh11/22, 7/2−[523]⊗9/2−[514] Nilsson configuration. This is the first observation of a two-quasiparticle t-band in the A=130 mass region. The t-band is fed by a dipole band involving two additional h11/2 protons. The odd-spin partners of the proton and neutron S-bands and the ground-state band at high spins are also newly identified. The observed bands are discussed using several theoretical models, total Routhians surfaces (TRS), tilted axis cranking (TAC), particle rotor model (PRM) and projected shell model (PSM), which strongly suggest the coexistence of prolate and oblate shapes polarized by rotation aligned two-proton and two-neutron configurations, as well as prolate collective rotations around axes with different orientations. With the new results, $^{130}$Ba presents one of the best and most complete sets of collective excitations that a γ-soft nucleus can manifest at medium and high spins, revealing a diversity of shapes and rotations for the nuclei in the A=130 mass region.
- Published
- 2019
30. Identification of high- K rotation in Ba130 : Testing the consistency of electromagnetic observables
- Author
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Qiang, Y. H., Petrache, C. M., Guo, S., Walker, P. M., Mengoni, D., Chen, Q. B., B. F., Lv, Astier, A., Dupont, E., Liu, M. L., Zhou, X. H., Wang, J. G., Bazzacco, D., Boso, A., Goasduff, A., Recchia, F., Testov, D., Galtarossa, F., Jaworski, G., Napoli, D. R., Riccetto, Serena, Siciliano, M., Valiente-Dobon, J. J., Andreoiu, C., Garcia, F. H., Ortner, K., Whitmore, K., Cederwall, B., Lawrie, E. A., Kuti, I., Sohler, D., Marchlewski, T., Srebrny, J., Tucholski, A., Dai, A. C., and F. R., Xu
- Subjects
Nuclear and High Energy Physics - Abstract
The band built on the Kπ = 8−, T1/2 = 9.4 ms isomer of 130Ba has been identified, filling the gap in the systematics of the dipole bands built on the 8− isomers in the N = 74 isotones from 128Xe to 138Gd. The use of the GALILEO array in conjunction with its ancillaries EUCLIDES and Neutron Wall, helped to firmly place the newly identified transitions on top of the long-lived isomer. The extracted gK and gR gyromagnetic factors are in agreement with the 7/2+[404] ⊗ 9/2−[514] two-neutron Nilsson configuration. Particle-rotor model calculations give an understanding of the limited degree of K mixing. The experimental information on the Kπ = 8− isomer of 130Ba is now the most complete among the K isomers of the N = 74 isotones.
- Published
- 2019
31. Collectivity of the 2p-2h proton intruder band of $^{116}$Sn
- Author
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Petrache, C.M., Régis, J.M., Andreoiu, C., Spieker, M., Michelagnoli, C., Garrett, P.E., Astier, A., Dupont, E., Garcia, F., Guo, S., Häfner, G., Jolie, J., Kandzia, F., Karayonchev, V., Kim, Y.H., Knafla, L., Köster, U., Lv, B.F., Marginean, N., Mihai, C., Mutti, P., Ortner, K., Porzio, C., Prill, S., Saed-Samii, N., Urban, W., Vanhoy, J.R., Whitmore, K., Wisniewski, J., Yates, S.W., Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut Laue-Langevin (ILL), and ILL
- Subjects
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Structure - Abstract
International audience; The half-life of the 42+ state of the 2p-2h proton intruder band of Sn116 has been measured with the fast-timing technique. The lifetime of T1/2=29(10) ps leads to a transition probability BE2;42+→22+=40(13) Weisskopf units, which is in very good agreement with the large BE2;22+→03+ value measured previously and provides strong support for the 03+ state as the bandhead of the intruder configuration and for the shape coexistence in the semimagic Sn116 nucleus. IBM-2 calculations with mixing reproduce the experimental data very well, giving insight into the degree of mixing between the different states.
- Published
- 2019
32. MBE growth and characterization of HgTe based quantum wells and superlattices
- Author
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Becker, C.R., Zhang, X.C., Ortner, K., Pfeuffer-Jeschke, A., Latussek, V., Daumer, V., Landwehr, G., and Molenkamp, L.W.
- Published
- 2004
- Full Text
- View/download PDF
33. Collectivity of the 2p-2h proton intruder band of Sn-116
- Author
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Petrache, C. M., Regis, J. -M., Andreoiu, C., Spieker, M., Michelagnoli, C., Garrett, P. E., Astier, A., Dupont, E., Garcia, F., Guo, S., Haefner, G., Jolie, J., Kandzia, F., Karayonchev, V., Kim, Y. -H., Knafla, L., Koster, U., Lv, B. F., Marginean, N., Mihai, C., Mutti, P., Ortner, K., Porzio, C., Prill, S., Saed-Samii, N., Urban, W., Vanhoy, J. R., Whitmore, K., Wisniewski, J., Yates, S. W., Petrache, C. M., Regis, J. -M., Andreoiu, C., Spieker, M., Michelagnoli, C., Garrett, P. E., Astier, A., Dupont, E., Garcia, F., Guo, S., Haefner, G., Jolie, J., Kandzia, F., Karayonchev, V., Kim, Y. -H., Knafla, L., Koster, U., Lv, B. F., Marginean, N., Mihai, C., Mutti, P., Ortner, K., Porzio, C., Prill, S., Saed-Samii, N., Urban, W., Vanhoy, J. R., Whitmore, K., Wisniewski, J., and Yates, S. W.
- Abstract
The half-life of the 4(2)(+) state of the 2p-2h proton intruder band of Sn-116 has been measured with the fast- timing technique. The lifetime of T-1/2 = 29(10) ps leads to a transition probability B(E2; 4(2)(+) -> 2(2)(+)) = 40(13) Weisskopf units, which is in very good agreement with the large B(E2; 2(2)(+) -> 0(3)(+)) value measured previously and provides strong support for the 0(3)(+) state as the bandhead of the intruder configuration and for the shape coexistence in the semimagic Sn-116 nucleus. IBM-2 calculations with mixing reproduce the experimental data very well, giving insight into the degree of mixing between the different states.
- Published
- 2019
34. Determination of the g-factor of n-type HgTe/Hg 1− xCd xTe single quantum wells
- Author
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Landwehr, G, Zhang, X.C, Ortner, K, Pfeuffer-Jeschke, A, and Becker, C.R
- Published
- 2003
- Full Text
- View/download PDF
35. Influence of the oxygen flow rate on gas flow sputtered thermal barrier coatings
- Author
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Rösemann, N., Ortner, K., Bäker, M., Petersen, J., Bräuer, G., Rösler, J., and Publica
- Subjects
microstructure ,gas flow sputtering ,thermal barrier coating ,oxygen flow rate - Abstract
Porous thermal barrier coatings (TBC) reduce the thermal load of gas turbine components. State-of-the-art TBCs consist of partially yttria-stabilized zirconia (PSZ) and are deposited by means of thermal spray techniques or electron beam physical vapor deposition. In this paper, an alternative, innovative deposition technique (reactive gas flow sputtering - GFS) is investigated and the influence of process parameters on the microstructure and the suitability of GFS coatings as TBCs is discussed. PSZ coatings were deposited on polished FeCrAlY-alloy substrates, with varying substrate temperature and oxygen flow rate, and characterized by means of SEM, and XRD. The substrate temperature is the crucial parameter. Between 500 and 800 °C, four types of columnar microstructures are found based on XRD pattern and morphology. The growth direction of the columns changes from to , accompanied by a change in shape from triangular to four-sided. Varying the oxygen flow rate at a given substrate temperature alters the microstructure defined by the substrate temperature. While oxygen flow rates above a certain level do not have an effect, low oxygen flow rates lead to further densification and compressive stresses, rendering these conditions unsuitable for TBC manufacturing. In conclusion, promising microstructures are presented accompanied by guidelines for process parameters.
- Published
- 2018
36. Diversity of shapes and rotations in the γ-soft 130Ba nucleus: First observation of a t-band in the A = 130 mass region
- Author
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Petrache, C.M., primary, Walker, P.M., additional, Guo, S., additional, Chen, Q.B., additional, Frauendorf, S., additional, Liu, Y.X., additional, Wyss, R.A., additional, Mengoni, D., additional, Qiang, Y.H., additional, Astier, A., additional, Dupont, E., additional, Li, R., additional, Lv, B.F., additional, Zheng, K.K., additional, Bazzacco, D., additional, Boso, A., additional, Goasduff, A., additional, Recchia, F., additional, Testov, D., additional, Galtarossa, F., additional, Jaworski, G., additional, Napoli, D.R., additional, Riccetto, S., additional, Siciliano, M., additional, Valiente-Dobon, J.J., additional, Liu, M.L., additional, Zhou, X.H., additional, Wang, J.G., additional, Andreoiu, C., additional, Garcia, F.H., additional, Ortner, K., additional, Whitmore, K., additional, Bäck, T., additional, Cederwall, B., additional, Lawrie, E.A., additional, Kuti, I., additional, Sohler, D., additional, Timár, J., additional, Marchlewski, T., additional, Srebrny, J., additional, and Tucholski, A., additional
- Published
- 2019
- Full Text
- View/download PDF
37. β decay and β -delayed neutron decay of the N=82 nucleus In8249131
- Author
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Dunlop, R., primary, Svensson, C. E., additional, Andreoiu, C., additional, Ball, G. C., additional, Bernier, N., additional, Bidaman, H., additional, Bildstein, V., additional, Bowry, M., additional, Cross, D. S., additional, Dillmann, I., additional, Dunlop, M. R., additional, Garcia, F. H., additional, Garnsworthy, A. B., additional, Garrett, P. E., additional, Hackman, G., additional, Henderson, J., additional, Measures, J., additional, Mücher, D., additional, Olaizola, B., additional, Ortner, K., additional, Park, J., additional, Petrache, C. M., additional, Pore, J. L., additional, Smith, J. K., additional, Southall, D., additional, Ticu, M., additional, Turko, J., additional, Whitmore, K., additional, and Zidar, T., additional
- Published
- 2019
- Full Text
- View/download PDF
38. Collectivity of the 2p-2h proton intruder band of Sn116
- Author
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Petrache, C. M., primary, Régis, J.-M., additional, Andreoiu, C., additional, Spieker, M., additional, Michelagnoli, C., additional, Garrett, P. E., additional, Astier, A., additional, Dupont, E., additional, Garcia, F., additional, Guo, S., additional, Häfner, G., additional, Jolie, J., additional, Kandzia, F., additional, Karayonchev, V., additional, Kim, Y.-H., additional, Knafla, L., additional, Köster, U., additional, Lv, B. F., additional, Marginean, N., additional, Mihai, C., additional, Mutti, P., additional, Ortner, K., additional, Porzio, C., additional, Prill, S., additional, Saed-Samii, N., additional, Urban, W., additional, Vanhoy, J. R., additional, Whitmore, K., additional, Wisniewski, J., additional, and Yates, S. W., additional
- Published
- 2019
- Full Text
- View/download PDF
39. Identification of high- K rotation in Ba130 : Testing the consistency of electromagnetic observables
- Author
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Qiang, Y. H., primary, Petrache, C. M., additional, Guo, S., additional, Walker, P. M., additional, Mengoni, D., additional, Chen, Q. B., additional, Lv, B. F., additional, Astier, A., additional, Dupont, E., additional, Liu, M. L., additional, Zhou, X. H., additional, Wang, J. G., additional, Bazzacco, D., additional, Boso, A., additional, Goasduff, A., additional, Recchia, F., additional, Testov, D., additional, Galtarossa, F., additional, Jaworski, G., additional, Napoli, D. R., additional, Riccetto, S., additional, Siciliano, M., additional, Valiente-Dobon, J. J., additional, Andreoiu, C., additional, Garcia, F. H., additional, Ortner, K., additional, Whitmore, K., additional, Cederwall, B., additional, Lawrie, E. A., additional, Kuti, I., additional, Sohler, D., additional, Marchlewski, T., additional, Srebrny, J., additional, Tucholski, A., additional, Dai, A. C., additional, and Xu, F. R., additional
- Published
- 2019
- Full Text
- View/download PDF
40. MBE growth and characterization of Hg based compounds and heterostructures
- Author
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Becker, C.R, Zhang, X.C, Ortner, K, Schmidt, J, Pfeuffer-Jeschke, A, Latussek, V, Gui, Y.S, Daumer, V, Liu, J, Buhmann, H, Landwehr, G, and Molenkamp, L.W
- Published
- 2002
- Full Text
- View/download PDF
41. Microstructure of gas flow sputtered thermal barrier coatings
- Author
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Rösemann, N., Ortner, K., Petersen, J., Bäker, M., Bräuer, G., Rösler, J., and Publica
- Subjects
reactive sputtering ,substrate temperature ,morphology ,microstructure ,gas flow sputtering ,bias voltage ,grain orientation ,yttria stabilized zirconia ,thermal barrier coating - Abstract
This work investigates the influence of substrate temperature and applied bias voltage on the resulting microstructure and crystallographic properties of gas flow sputtered (GFS) partially yttria stabilized zirconia coatings (PSZ).On a FeCrAlY-alloy substrate PSZ coatings were deposited at substrate temperatures of 500 °C, 650 °C and 800 °C with bias voltages up to − 100 V and were subsequently analyzed utilizing SEM, FIB and XRD. Without bias voltage, all coatings were columnar and composed of small stacked platelets, but they varied in their porosity and morphology. Higher substrate temperatures lead to higher adatom mobility decreasing the porosity and the deposition rate. For all microstructures adistinct growth direction of the columns is observed changing from 〈111〉 (500 °C and 650 °C) to 〈100〉 (800 °C). For the 〈111〉 morphology, three ridges at intervals of 120° are observed throughout the whole column. In addition to the tetragonal/cubic phase, monoclinic fractions are found at the two lower substrate temperatures. The application of a negative bias voltage enhances the surface mobility of the film-forming adatoms and can cause densification due to atom displacements, resputtering or channeling phenomena. Moderate bias voltages up to − 40 V result in more regular columns and a lower porosity. For high bias voltages (− 100 V), the densification effects seem to dominate leading to fully dense coatings with residual stresses up to − 2.5 GPa and no preferential grain orientation, rendering this bias value unsuitable for thermal barrier coatings.
- Published
- 2017
42. Photoemission investigation of MBE-grown HgSe/CdSe heterostructures
- Author
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Eich, D., Hübner, D., Ortner, K., Kilian, L., Becker, R., Landwehr, G., Fink, R., and Umbach, E.
- Published
- 2000
- Full Text
- View/download PDF
43. HomeVent Register – Prävalenz von chronischer Hyperkapnie bei COPD-Patienten und deren Behandlungspfade
- Author
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Dreher, M, additional, Neuzeret, PC, additional, Busam, D, additional, Hoheisel, G, additional, Gröschel, A, additional, Woehrle, H, additional, Ortner, K, additional, Graml, A, additional, Windisch, W, additional, and Köhnlein, T, additional
- Published
- 2018
- Full Text
- View/download PDF
44. Molecular beam epitaxially grown n type Hg[sub 0.80]Cd[sub 0.20]Te(112)B using iodine.
- Author
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Schmidt, J., Ortner, K., Jensen, J. E., and Becker, C. R.
- Subjects
- *
MOLECULAR beam epitaxy , *ATOMIC force microscopy , *IODINE - Abstract
The molecular beam epitaxial growth and n type doping of Hg[sub 0.80]Cd[sub 0.20]Te(112)B have been investigated. The surface morphology has been determined via atomic force microscopy and is appreciably different from that of the (001) orientation; long ridges and trenches are observed whose height difference is considerably less than that of the nearly elliptically shaped mounds found in (001) alloys. The mobility has been optimized with regard to growth parameters such as the Hg/Te flux ratio resulting in a maximum value of 4.0±0.6×10[sup 5] cm[sup 2]/(V s) for an undoped sample at low temperatures. n type Hg[sub 0.80]Cd[sub 0.20]Te(112)B has been grown using iodine in the form of CdI[sub 2] as a dopant. The maximum electron concentration due to iodine doping has been determined after an Hg vacancy anneal to be 4.2±0.7×10[sup 18] cm[sup -3]. Typical mobilities at low temperatures are 4.0×10[sup 4] and 1.0×10[sup 5] cm[sup 2]/(V s) for electron concentration levels of 1.0×10[sup 17] and 5.0×10[sup 16] cm[sup -3], respectively. By means of secondary ion mass spectroscopy the iodine concentration has been determined and hence the degree of activation. The electron concentration is proportional to that of iodine with a 100% electrical activation for concentrations up to approx. 10[sup 18] cm[sup -3]. At higher concentrations compensation is observed. © 2002 American Institute of Physics. [ABSTRACT FROM AUTHOR]
- Published
- 2002
- Full Text
- View/download PDF
45. Molecular beam epitaxially grown n type Hg0.80Cd0.20Te(112)B using iodine
- Author
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Schmidt, J., Ortner, K., Jensen, J.E., and Becker, C.R.
- Subjects
Iodine -- Usage ,Transition metals -- Research ,Transition metals -- Electric properties ,Epitaxy -- Research ,Physics - Abstract
Molecular beam epitaxy (MBE) grown Hg0.80Cd0.20Te(112)B is shown to have the highest mobilities and close to a minimum density of voids when a Hg/Te flux ratio of approximately 180 is employed. Electron concentration is proportional to that of iodine with a 100% electrical activation for concentration up to approx. 10(super 18) cm(super -3).
- Published
- 2002
46. Metal-supported palladium membranes for hydrogen separation
- Author
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Haydn, M., primary, Ortner, K., additional, Franco, T., additional, Schafbauer, W., additional, Behrens, A., additional, Dittmar, B., additional, Hummel, S., additional, Sulik, M., additional, Rüttinger, M., additional, Venskutonis, A., additional, and Sigl, L. S., additional
- Published
- 2015
- Full Text
- View/download PDF
47. Influence of bias voltage and oxygen flow rate on morphology and crystallographic properties of gas flow sputtered zirconia coatings
- Author
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Rösemann, N., primary, Ortner, K., additional, Petersen, J., additional, Schadow, T., additional, Bäker, M., additional, Bräuer, G., additional, and Rösler, J., additional
- Published
- 2015
- Full Text
- View/download PDF
48. Hollow cathode gas flow sputtering of NixAly coatings on Ti-6Al-2Sn-4Zr-6Mo: Mechanical properties and microstructures
- Author
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Kohns, A., Ortner, K., Jung, T., and Publica
- Abstract
This paper reports on the deposition of Ni(x)Al(y) coatings on Ti-6Al- 2Sn-4Zr-6Mo by hollow cathode GFS (gas flow sputtering). It is possible to deposit Ni(x)Al(y) coatings with a large variety of mechanical properties, compositions and microstructures. The latter can be influenced significantly by variations of the bias voltage. Hydroxides or oxides can develop within the porosities due to multi-stage chemical processes during or after sampling the coated specimen out of the vacuum chamber. With regard to the nickel content in the coating, a significant enrichment can be observed for bias voltages of 50 V and more. With regard to the mechanical properties, it occurred that plastic hardness and elasticity correlate for variations of the substrate bias and the process pressure. The reduction of porosities for bias voltages of 25 and 50 V goes along with higher levels of hardness and elasticity. Peak values for both factors are found at U(ind B) = 50V, while the elastic indentation modulus reaches a minimum there. At U(ind B) = 150V, variations of the oxygen content do not occur for different process pressures. However, for high bias voltages an increasing process pressure can lead to a significant temperature increase at the substrate, which influences the mobility of the atoms during deposition. This effect can have a measurable impact on the mechanical properties and might explain the variations regarding hardness and elasticity for different process pressures. At U(ind B) = 50 V, it appears that these effects compensate as no significant variations can be observed. High compressive stresses were detected in the coating deposited without substrate bias. Due to the high porosity of the coating, this effect is attributed to the creation of oxides/hydroxides in the hollow spaces and the related increase in density. The variation of residual stresses between compressive and tensile state for bias voltages between 25 and 150 V is discussed. The results of this study can be used as a basis to diminish the fatigue strength reduction of Ti-6Al-2Sn-4Zr-6Mo components coated with an erosion resistant multilayer system. In contrast to the standard deposition parameter (U(ind B) = 25 V, p(ind Ch) = 0.49 mbar), a substrate bias of 50 V, for example produces a coating with a microcrystalline structure, higher hardness and elasticity values and a lower stiffness. Coatings like these might have the potential to diminish the propagation of cracks into the substrate.
- Published
- 2009
49. Structure, stability, and biodistribution of cationic M(CO)(3)](+) (M = Re, Tc-99, Tc-99m) complexes with tridentate amine ligands
- Author
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Hafliger, P, Mundwiler, S, Ortner, K, Spingler, Bernhard, Alberto, R, Andocs, G, Balogh, L, Bodo, K, University of Zurich, and Alberto, R
- Subjects
10120 Department of Chemistry ,1604 Inorganic Chemistry ,540 Chemistry ,1606 Physical and Theoretical Chemistry - Published
- 2005
50. Synthesis and properties of boranocarbonate: a convenient in situ CO source for the aqueous preparation of [(super99m)Tc(OH(sub 2))(sub 3)(CO)(sub 3)](super +)
- Author
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Alberto, R, Ortner, K, Wheatley, N, Schibli, R, and Schubiger, A
- Subjects
Chemistry, Physical and theoretical -- Research ,Organic compounds -- Synthesis ,Chemistry - Published
- 2001
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