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342 results on '"Gregorich K"'

1. Towards the Discovery of New Elements: Production of Livermorium (Z=116) with 50Ti

Author

Gates, J. M., Orford, R., Rudolph, D., Appleton, C., Barrios, B. M., Benitez, J. Y., Bordeau, M., Botha, W., Campbell, C. M., Chadderton, J., Chemey, A. T., Clark, R. M., Crawford, H. L., Despotopulos, J. D., Dorvaux, O., Esker, N. E., Fallon, P., Folden III, C. M., Gall, B. J. P., Garcia, F. H., Golubev, P., Gooding, J. A., Grebo, M., Gregorich, K. E., Guerrero, M., Henderson, R. A., Herzberg, R. -D., Hrabar, Y., King, T. T., Covo, M. Kireeff, Kirkland, A. S., Krücken, R., Leistenschneider, E., Lykiardopoulou, E. M., McCarthy, M., Mildon, J. A., Müller-Gatermann, C., Phair, L., Pore, J. L., Rice, 1 E., Rykaczewski, K. P., Sammis, B. N., Sarmiento, L. G., Seweryniak, D., Sharp, D. K., Sinjari, A., Steinegger, P., Stoyer, M. A., Szornel, J. M., Thomas, K., Todd, D. S., Vo, P., Watson, V., and Wooddy, P. T.

Subjects
Nuclear Experiment
Abstract

The $^{244}$Pu($^{50}$Ti,$xn$)$^{294-x}$Lv reaction was investigated at Lawrence Berkeley National Laboratory's 88-Inch Cyclotron facility. The experiment was aimed at the production of a superheavy element with $Z\ge 114$ by irradiating an actinide target with a beam heavier than $^{48}$Ca. Produced Lv ions were separated from the unwanted beam and nuclear reaction products using the Berkeley Gas-filled Separator and implanted into a newly commissioned focal plane detector system. Two decay chains were observed and assigned to the decay of $^{290}$Lv. The production cross section was measured to be $\sigma_{\rm prod}=0.44(^{+58}_{-28})$~pb at a center-of-target center-of-mass energy of 220(3)~MeV. This represents the first published measurement of the production of a superheavy element near the `Island-of-Stability', with a beam of $^{50}$Ti and is an essential precursor in the pursuit of searching for new elements beyond $Z=118$., Comment: Submitted to Physical Review Letters

Published
2024

2. On the half life of $^{71}$Ge and the Gallium Anomaly

Author

Norman, E. B., Drobizhev, A., Gharibyan, N., Gregorich, K. E., Kolomensky, Yu. G., Sammis, B. N., Scielzo, N. D., Shusterman, J. A., and Thomas, K. J.

Subjects
Nuclear Experiment
Abstract

Recent discussions about the origin of the Gallium Anomaly have motivated a remeasurement of the half life of $^{71}$Ge. We have conducted three separate measurements using dedicated planar Ge detectors: one with $^{55}$Fe as a standard, one with $^{57}$Co as a standard, and one stand alone 71Ge measurement. Our results yield a half life of 11.468 +- 0.008 days, which is consistent with but significantly more precise than the currently accepted value. With this experiment, the potential explanation of the Gallium Anomaly being due to an unexpectedly long $^{71}$Ge half life has been ruled out, leaving the origin of the anomaly as an open question., Comment: 9 pages, 4 figures

Published
2024

3. Heavy element formation in compound nucleus reactions with 238U targets

Author

Gregorich, K, Dullman, CE, Loveland, W, Folden, CM, Gates, Jacklyn, Garcia, MA, Sudowe, R, Stavestra, L, Dragojevic, I, Nelson, SL, Pang, GK, Zielinski, PM, Chung, YH, Eichler, R, Schaedel, M, Teurler, A, Yakushev, A, Dvorak, J, Hoffman, DC, and Nitsche, H

Published
2023

4. Heavy element formation in compound nucleus reactions with 238U targets

Author

Gregorich, K, Dullman, CE, Loveland, W, Folden, CM, Gates, Jacklyn, Garcia, MA, Sudowe, R, Stavestra, L, Dragojevic, I, Nelson, SL, Pang, GK, Zielinski, PM, Chung, YH, Eichler, R, Schaedel, M, Teurler, A, Yakushev, A, Dvorak, J, Hoffman, DC, and Nitsche, H

Published
2021

5. Recoil-alpha-fission and recoil-alpha-alpha-fission events observed in the reaction Ca-48 + Am-243

Author

Forsberg, U., Rudolph, D., Andersson, L. -L., Di Nitto, A., Düllmann, Ch. E., Gates, J. M., Golubev, P., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., Hessberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Sarmiento, L. G., Schädel, M., Yakushev, A., Åberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Dobaczewski, J., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jäger, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nazarewicz, W., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Shi, Y., Thörle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Türler, A., Ward, A., Ward, D. E., and Wiehl, N.

Subjects
Nuclear Experiment
Abstract

Products of the fusion-evaporation reaction Ca-48 + Am-243 were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum f\"ur Schwerionenforschung. Amongst the detected thirty correlated alpha-decay chains associated with the production of element Z=115, two recoil-alpha-fission and five recoil-alpha-alpha-fission events were observed. The latter are similar to four such events reported from experiments performed at the Dubna gas-filled separator. Contrary to their interpretation, we propose an alternative view, namely to assign eight of these eleven decay chains of recoil-alpha(-alpha)-fission type to start from the 3n-evaporation channel 115-288. The other three decay chains remain viable candidates for the 2n-evaporation channel 115-289., Comment: 15 pages. Article: 9 pages, 3 tables, 3 figures. Supplemental material: 6 pages, 7 tables, 1 figure. Submitted to PRC

Published
2015
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6. Search for Oscillation of the Electron-Capture Decay Probability of $^{142}$Pm

Author

Vetter, P. A., Clark, R. M., Dvorak, J., Freedman, S. J., Gregorich, K. E., Jeppesen, H. B., Mittelberger, D., and Wiedeking, M.

Subjects
Nuclear Experiment
Abstract

We have searched for time modulation of the electron capture decay probability of $^{142}$Pm in an attempt to confirm a recent claim from a group at the Gesellschaft f\"{u}r Schwerionenforschung (GSI). We produced $^{142}$Pm via the $^{124}$Sn($^{23}$Na, 5n)$^{142}$Pm reaction at the Berkeley 88-Inch Cyclotron with a bombardment time short compared to the reported modulation period. Isotope selection by the Berkeley Gas-filled Separator is followed by implantation and a long period of monitoring the $^{142}$Nd K$_{\alpha}$ x-rays from the daughter. The decay time spectrum of the x-rays is well-described by a simple exponential and the measured half-life of 40.68(53) seconds is consistent with the accepted value. We observed no oscillatory modulation at the proposed frequency at a level 31 times smaller than that reported by Litvinov {\it et al.} (Phys. Lett. B 664 (2008) 162; arXiv:0801.2079 [nucl-ex]). A literature search for previous experiments that might have been sensitive to the reported modulation uncovered another example in $^{142}$Eu electron-capture decay. A reanalysis of the published data shows no oscillatory behavior., Comment: 12 pages (double-spaced), 6 figures

Published
2008
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7. Cross Section Limits for the $^{208}$Pb($^{86}$Kr,n)$^{293}$118 Reaction

Author

Gregorich, K. E., Ginter, T. N., Loveland, W., Peterson, D., Patin, J. B., Folden III, C. M., Hoffman, D. C., Lee, D. M., Nitsche, H., Omtvedt, J. P., Omtvedt, L. A., Stavsetra, L., Sudowe, R., Wilk, P. A., Zielinski, P. M., and Aleklett, K.

Subjects
Nuclear Experiment
Abstract

In April-May, 2001, the previously reported experiment to synthesize element 118 using the $^{208}$Pb($^{86}$Kr,n)$^{293}$118 reaction was repeated. No events corresponding to the synthesis of element 118 were observed with a total beam dose of 2.6 x 10$^{18}$ ions. The simple upper limit cross sections (1 event) were 0.9 and 0.6 pb for evaporation residue magnetic rigidities of 2.00 $T m$ and 2.12 $T m$, respectively. A more detailed cross section calculation, accounting for an assumed narrow excitation function, the energy loss of the beam in traversing the target and the uncertainty in the magnetic rigidity of the Z=118 recoils is also presented. Re-analysis of the primary data files from the 1999 experiment showed the reported element 118 events are not in the original data. The current results put constraints on the production cross section for synthesis of very heavy nuclei in cold fusion reactions., Comment: 7 pages, 2 figures. Submitted to EPJA

Published
2002
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8. Search for the Production of Element 112 in the 48Ca + 238U Reaction

Author

Loveland, W., Gregorich, K. E., Patin, J. B., Peterson, D., Rouki, C., Zielinski, P. M., and Aleklett, K.

Subjects
Nuclear Experiment
Abstract

We have searched for the production of element 112 in the reaction of 231 MeV 48Ca with 238U. We have not observed any events with a "one event" upper limit cross section of 1.6 pb for EVR-fission events and 1.8 pb for EVR-alpha events., Comment: 6 pages, 3 figures, submitted to Phys. Rev. C

Published
2002
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9. Non-Observation of the Production of Superheavy Nuclei in the Reaction of $^{86]$Kr with $^{208}$Pb

Author

Gregorich, K. E., Loveland, W., Ghiorso, A., Hoffman, D. C., Lee, D. M., Nitsche, H., Swiatecki, W. J., Kirbach, U. W., Laue, C. A., Adams, J. L., Patin, J. B., Shaughnessy, D. A., Strellis, D. A., and Wilk, P. A.

Subjects
Nuclear Experiment
Abstract

The published claim for the discovery of element 118 is retracted., Comment: 1 page, paper accepted for publication in PRL, will not be published

Published
2002

10. Heavy element formation in compound nucleus reactions with 238U targets

Author

Gregorich, K, Gregorich, K, Dullman, CE, Loveland, W, Folden, CM, Gates, Jacklyn, Garcia, MA, Sudowe, R, Stavestra, L, Dragojevic, I, Nelson, SL, Pang, GK, Zielinski, PM, Chung, YH, Eichler, R, Schaedel, M, Teurler, A, Yakushev, A, Dvorak, J, Hoffman, DC, Nitsche, H, Gregorich, K, Gregorich, K, Dullman, CE, Loveland, W, Folden, CM, Gates, Jacklyn, Garcia, MA, Sudowe, R, Stavestra, L, Dragojevic, I, Nelson, SL, Pang, GK, Zielinski, PM, Chung, YH, Eichler, R, Schaedel, M, Teurler, A, Yakushev, A, Dvorak, J, Hoffman, DC, and Nitsche, H

Published
2022

11. Erratum: Level structure of Ba141 and Xe139 and the level systematics of N=85 even-odd isotones [Phys. Rev. C 66 , 014305 (2002)]

Author

Luo, Y. X., primary, Wang, E. H., additional, Rasmussen, J. O., additional, Hamilton, J. H., additional, Ramayya, A. V., additional, Hwang, J. K., additional, Beyer, C. J., additional, Zhu, S. J., additional, Kormicki, J., additional, Zhang, X. Q., additional, Jones, E. F., additional, Gore, P. M., additional, Ginter, T. N., additional, Gregorich, K. E., additional, Lee, I-Yang., additional, Macchiavelli, A., additional, Zielinski, P., additional, Folden, C. M., additional, Fallon, P., additional, Ter-Akopian, G. M., additional, Oganessian, Yu. Ts., additional, Daniel, A. V., additional, Stoyer, M. A., additional, Cole, J. D., additional, Donangelo, R., additional, Wu, S. C., additional, and Asztalos, S., additional

Published
2023
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12. Evidence for the Synthesis of Element 110 Produced by the 59Co+209Bi Reaction

Author

Ghiorso, A., Lee, D., Somerville, P., Loveland, W., Nitschke, M., Ghiorso, W., Seaborg, G.T., Wilmarth, P.A., Leres, R., Wydler, A., Nurmia, M.J., Gregorich, K., Gaylord, R., Hamilton, T., Hannink, N.J., Hoffman, D.C., Jarzynski, C., Kacher, C., Kadkhodayan, B., Kreek, S., Lane, M., Lyon, A., McMahan, M.A., Neu, M., Sikkeland, T., Swiatecki, W.J., Turler, A., Walton, J.T., and Yashita, S.

Published
1994

14. Erratum: High spin states in Sr95 [Phys. Rev. C 69 , 067302 (2004)]

Author

Hwang, J. K., primary, Wang, E. H., additional, Ramayya, A. V., additional, Hamilton, J. H., additional, Luo, Y. X., additional, Rasmussen, J. O., additional, Beyer, C. J., additional, Gore, P. M., additional, Wu, S. C., additional, Lee, I. Y., additional, Folden, C. M., additional, Fallon, P., additional, Zielinski, P., additional, Gregorich, K. E., additional, Stoyer, M. A., additional, Ginter, T. N., additional, Zhu, S. J., additional, Cole, J. D., additional, and Donangelo, R., additional

Published
2022
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15. Erratum: Identification of collective bands in neutron-rich Ru113 [Phys. Rev. C 67 , 064307 (2003)]

Author

Zhang, Z., primary, Wang, E. H., additional, Zhu, S. J., additional, Hamilton, J. H., additional, Ramayya, A. V., additional, Hwang, J. K., additional, Xu, R. Q., additional, Jiang, Z., additional, Xiao, S. D., additional, Zhang, X. Q., additional, Kormicki, J., additional, Gore, P. M., additional, Jones, E. F., additional, Ma, W. C., additional, Cole, J. D., additional, Drigert, M. W., additional, Lee, I. Y., additional, Rasmussen, J. O., additional, Luo, Y. X., additional, Ginter, T. N., additional, Folden, C., additional, Fallon, P., additional, Zielinski, P., additional, Gregorich, K. E., additional, Macchiavelli, A. O., additional, Donangelo, R., additional, and Stoyer, M. A., additional

Published
2022
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16. Erratum: Identification of the ν9/2[404] band in Sr97 [Phys. Rev. C 67 , 054304 (2003)]

Author

Hwang, J. K., primary, Wang, E. H., additional, Ramayya, A. V., additional, Hamilton, J. H., additional, Fong, D., additional, Beyer, C. J., additional, Gore, P. M., additional, Luo, Y. X., additional, Rasmussen, J. O., additional, Wu, S. C., additional, Lee, I. Y., additional, Folden, C. M., additional, Fallon, P., additional, Zielinski, P., additional, Gregorich, K. E., additional, Macchiavelli, A., additional, Stoyer, M. A., additional, Asztalos, S., additional, Ginter, T. N., additional, Zhu, S. J., additional, Cole, J. D., additional, Ter-Akopian, G. M., additional, Oganessian, Yu. Ts., additional, and Donangelo, R., additional

Published
2022
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19. Selected spectroscopic results on element 115 decay chains

Author

Rudolph, D., Forsberg, U., Golubev, P., Sarmiento, L. G., Yakushev, A., Andersson, L.-L., Di Nitto, A., Düllmann, Ch. E., Gates, J. M., Gregorich, K. E., Gross, C. J., Herzberg, R.-D., Heßberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Schädel, M., Åberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jäger, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Thörle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Türler, A., Ward, A., Ward, D. E., and Wiehl, N.

Published
2015
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21. Erratum: Fission γ spectra and levels in Ba139 [Phys. Rev. C 64 , 054306 (2001)]

Author

Luo, Y. X., primary, Wang, E. H., additional, Rasmussen, J. O., additional, Ramayya, A. V., additional, Hamilton, J. H., additional, Zhang, X. Q., additional, Hwang, J. K., additional, Beyer, C. J., additional, Kormicki, J., additional, Ter-Akopian, G. M., additional, Oganessian, Yu. Ts., additional, Daniel, A. V., additional, Gregorich, K. E., additional, Ginter, T. N., additional, Zielinski, P., additional, Folden, C. M., additional, Lee, I. Y., additional, Fallon, P., additional, Macchiavelli, A., additional, Donangelo, R., additional, Stoyer, M. A., additional, Asztalos, S., additional, and Wu, S. C., additional

Published
2021
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22. Fusion reaction Ca 48 + Bk 249 leading to formation of the element Ts (Z=117)

Author

Khuyagbaatar J., Yakushev A., Dullmann Ch. E., Ackermann D., Andersson L. -L., Asai M., Block M., Boll R. A., Brand H., Cox D. M., Dasgupta M., Derkx X., Di Nitto A., Eberhardt K., Even J., Evers M., Fahlander C., Forsberg U., Gates J. M., Gharibyan N., Golubev P., Gregorich K. E., Hamilton J. H., Hartmann W., Herzberg R. -D., Hessberger F. P., Hinde D. J., Hoffmann J., Hollinger R., Hubner A., Jager E., Kindler B., Kratz J. V., Krier J., Kurz N., Laatiaoui M., Lahiri S., Lang R., Lommel B., Maiti M., Miernik K., Minami S., Mistry A., Mokry C., Nitsche H., Omtvedt J. P., Pang G. K., Papadakis P., Renisch D., Roberto J., Rudolph D., Runke J., Rykaczewski K. P., Sarmiento L. G., Schadel M., Schausten B., Semchenkov A., Shaughnessy D. A., Steinegger P., Steiner J., Tereshatov E. E., Thorle-Pospiech P., Tinschert K., Torres De Heidenreich T., Trautmann N., Turler A., Uusitalo J., Ward D. E., Wegrzecki M., Wiehl N., Van Cleve S. M., Yakusheva V., Khuyagbaatar, J., Yakushev, A., Dullmann, Ch. E., Ackermann, D., Andersson, L. -L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R. -D., Hessberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hubner, A., Jager, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento, L. G., Schadel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thorle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Turler, A., Uusitalo, J., Ward, D. E., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., and Yakusheva, V.

Subjects
Nuclear Theory, Nuclear Experiment
Abstract

The heaviest currently known nuclei, which have up to 118 protons, have been produced in Ca48 induced reactions with actinide targets. Among them, the element tennessine (Ts), which has 117 protons, has been synthesized by fusing Ca48 with the radioactive target Bk249, which has a half-life of 327 d. The experiment was performed at the gas-filled recoil separator TASCA. Two long and two short α decay chains were observed. The long chains were attributed to the decay of Ts294. The possible origin of the short-decay chains is discussed in comparison with the known experimental data. They are found to fit with the decay chain patterns attributed to Ts293. The present experimental results confirm the previous findings at the Dubna Gas-Filled Recoil Separator on the decay chains originating from the nuclei assigned to Ts.

Published
2019

24. Search for elements 119 and 120

Author

Khuyagbaatar, J., Yakushev, A., Düllmann, Ch. E., Ackermann, D., Andersson, L.-L., Asai, M., Block, M., Boll, R.A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R.-D., Heßberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Kratz, J.V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A. K., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J. B., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento Pico, Luis, Schädel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thörle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., Yakusheva, V., Khuyagbaatar, J., Yakushev, A., Düllmann, Ch. E., Ackermann, D., Andersson, L.-L., Asai, M., Block, M., Boll, R.A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R.-D., Heßberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Kratz, J.V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A. K., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J. B., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento Pico, Luis, Schädel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thörle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., and Yakusheva, V.

Abstract

A search for production of the superheavy elements with atomic numbers 119 and 120 was performed in the 50Ti+249Bk and 50Ti+249Cf fusion-evaporation reactions, respectively, at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. Over four months of irradiation, the 249Bk target partially decayed into 249Cf, which allowed for a simultaneous search for both elements. Neither was detected at cross-section sensitivity levels of 65 and 200 fb for the 50Ti+249Bk and 50Ti+249Cf reactions, respectively, at a midtarget beam energy of Elab = 281.5 MeV. The nonobservation of elements 119 and 120 is discussed within the concept of fusion-evaporation reactions including various theoretical predictions on the fission-barrier heights of superheavy nuclei in the region of the island of stability.

Published
2020

26. First chemical investigation of hassium (Hs, Z=108)

Author

Düllmann, Ch. E., Dressler, R., Eichler, B., Gäggeler, H. W., Glaus, F., Jost, D. T., Piguet, D., Soverna, S., Türler, A., Brüchle, W., Eichler, R., Jäger, E., Pershina, V., Schädel, M., Schausten, B., Schimpf, E., Schött, H. -J., Wirth, G., Eberhardt, K., Thörle, P., Trautmann, N., Ginter, T. N., Gregorich, K. E., Hoffman, D. C., Kirbach, U. W., Lee, D. M., Nitsche, H., Patin, J. B., Sudowe, R., Zielinski, P. M., Timokhin, S. N., Yakushev, A. B., Vahle, A., and Qin, Z.

Published
2003
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28. Chemical investigation of hassium (element 108)

Author

Dullmann, Ch. E., Bruchle, W., Dressler, R., Eberhardt, K., Eichler, B., Eichler, R., Gaggeler, H. W., Ginter, T. N., Glaus, F., Gregorich, K. E., Hoffman, D. C., Jager, E., Jost, D. T., Kirbach, U. W., Lee, D. M., Nitsche, H., Patin, J. B., Pershina, V., Piguet, D., Qin, Z., Schadel, M., Schausten, B., Schimpf, E., Schott, H.-J., Soverna, S., Sudowe, R., Thorle, P., Timokhin, S. N., Trautmann, N., Turler, A., Vahle, A., Wirth, G., Yakushev, A. B., and Zielinski, P. M.

Subjects
Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

Author(s): Ch. E. Düllmann [1, 2]; W. Brüchle [3]; R. Dressler [2]; K. Eberhardt [4]; B. Eichler [2]; R. Eichler [2]; H. W. Gäggeler (corresponding author) [1, 2]; T. N. [...]

Published
2002
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30. Search for elements 119 and 120

Author

Khuyagbaatar, J., primary, Yakushev, A., additional, Düllmann, Ch. E., additional, Ackermann, D., additional, Andersson, L.-L., additional, Asai, M., additional, Block, M., additional, Boll, R. A., additional, Brand, H., additional, Cox, D. M., additional, Dasgupta, M., additional, Derkx, X., additional, Di Nitto, A., additional, Eberhardt, K., additional, Even, J., additional, Evers, M., additional, Fahlander, C., additional, Forsberg, U., additional, Gates, J. M., additional, Gharibyan, N., additional, Golubev, P., additional, Gregorich, K. E., additional, Hamilton, J. H., additional, Hartmann, W., additional, Herzberg, R.-D., additional, Heßberger, F. P., additional, Hinde, D. J., additional, Hoffmann, J., additional, Hollinger, R., additional, Hübner, A., additional, Jäger, E., additional, Kindler, B., additional, Kratz, J. V., additional, Krier, J., additional, Kurz, N., additional, Laatiaoui, M., additional, Lahiri, S., additional, Lang, R., additional, Lommel, B., additional, Maiti, M., additional, Miernik, K., additional, Minami, S., additional, Mistry, A. K., additional, Mokry, C., additional, Nitsche, H., additional, Omtvedt, J. P., additional, Pang, G. K., additional, Papadakis, P., additional, Renisch, D., additional, Roberto, J. B., additional, Rudolph, D., additional, Runke, J., additional, Rykaczewski, K. P., additional, Sarmiento, L. G., additional, Schädel, M., additional, Schausten, B., additional, Semchenkov, A., additional, Shaughnessy, D. A., additional, Steinegger, P., additional, Steiner, J., additional, Tereshatov, E. E., additional, Thörle-Pospiech, P., additional, Tinschert, K., additional, Torres De Heidenreich, T., additional, Trautmann, N., additional, Türler, A., additional, Uusitalo, J., additional, Wegrzecki, M., additional, Wiehl, N., additional, Van Cleve, S. M., additional, and Yakusheva, V., additional

Published
2020
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31. Cold binary and ternary fragmentations in spontaneous fission of252Cf

Author

Ramayya, A. V., Hamilton, J. H., Hwang, J. K., Peker, L. K., Kormicki, J., Babu, B. R. S., Ginter, T. N., Sandulescu, A., Florescu, A., Carstoiu, F., Greiner, W., Ter-Akopian, G. M., Oganessian, Yu. Ts., Daniel, A. V., Ma, W. C., Varmette, P. G., Rasmussen, J. O., Asztalos, S. J., Chu, S. Y., Gregorich, K. E., Macchiavelli, A. O., Macleod, R. W., Cole, J. D., Aryaeinejad, R., Butler-Moore, K., Drigert, M. W., Stoyer, M. A., Bernstein, L. A., Lougheed, R. W., Moody, K. J., Prussin, S. G., Zhu, S. J., Griffin, H. C., and Donangelo, R.

Published
1997
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32. 117番元素Ts合成のための48Ca+249Bk融合反応

Author

Khuyagbaatar, J., Yakushev, A., Düllmann, Ch E., Ackermann, D., Andersson, L. L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R. D., Heßberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento, L. G., Schädel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thörle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Ward, D. E., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., and Yakusheva, V.

Subjects
gas-filled separator, superheavy elements, element 117 (Ts), alpha decay, Subatomic Physics, Nuclear Theory, low and intermediate energy heavy-ion reactions, ydinfysiikka, Nuclear Experiment, nuclear structure and decays
Abstract

We have performed an experiment to synthesize the element 117 (Ts) with the $^{48}$Ca+$^{249}$Bk fusion reaction. Four $\alpha$-decay chains attributed to the element 117 were observed. Two of them were long decay chains which can be assigned to the one originating from the $\alpha$ decay of $^{294}$Ts. The other two were short decay chains which are consistent with the one originating from the $\alpha$ decay of $^{293}$Ts. We have compared the present results with the literature data, and found that our present results mostly confirmed the literature data, leading to the firm confirmation of the synthesis of the element 117., $^{48}$Ca+$^{249}$B融合反応を用いて117番元素(Ts)合成実験を行い、117番元素に起因すると思われる4つの$\alpha$崩壊連鎖を観測した。うち2つは長い崩壊連鎖で、$^{294}$Tsの$\alpha$崩壊に起因するものと同定された。他の2つは短い崩壊連鎖で、$^{293}$Tsの$\alpha$崩壊に起因すると考えると矛盾しない。今回の結果と過去の文献値を比較したところ、今回の我々の結果は過去の文献値をほぼ再現し、117番元素合成の事実を強く再確認する結果となった。

Published
2019

33. Fusion reaction 48Ca + 249Bk leading to formation of the element Ts (Z=117)

Author

Khuyagbaatar, J., Yakushev, A., Düllmann, Ch E., Ackermann, D., Andersson, L. L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R. D., Heßberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento, L. G., Schädel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thörle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Ward, D. E., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., Yakusheva, V., Khuyagbaatar, J., Yakushev, A., Düllmann, Ch E., Ackermann, D., Andersson, L. L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R. D., Heßberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento, L. G., Schädel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thörle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Ward, D. E., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., and Yakusheva, V.

Abstract

The heaviest currently known nuclei, which have up to 118 protons, have been produced in 48Ca induced reactions with actinide targets. Among them, the element tennessine (Ts), which has 117 protons, has been synthesized by fusing 48Ca with the radioactive target 249Bk, which has a half-life of 327 d. The experiment was performed at the gas-filled recoil separator TASCA. Two long and two short α decay chains were observed. The long chains were attributed to the decay of 294Ts. The possible origin of the short-decay chains is discussed in comparison with the known experimental data. They are found to fit with the decay chain patterns attributed to 293Ts. The present experimental results confirm the previous findings at the Dubna Gas-Filled Recoil Separator on the decay chains originating from the nuclei assigned to Ts.

Published
2019

34. Gas phase chromatography of halides of elements 104 and 105

Author

Türler, A., Gäggeler, H. W., Gregorich, K. E., Barth, H., Brüchle, W., Czerwinski, K. R., Gober, M. K., Hannink, N. J., Henderson, R. A., Hoffman, D. C., Jost, D. T., Kacher, C. D., Kadkhodayan, B., Kovacs, J., Kratz, J. V., Kreek, S. A., Lee, D. M., Leyba, J. D., Nurmia, M. J., Schädel, M., Scherer, U. W., Schimpf, Vermeulen, D., Weber, A., Zimmermann, H. P., and Zvara, I.

Published
1992
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36. Chemical characterization of bohrium (element 107)

Author

Eichler, R., Brüchle, W., Dressler, R., Düllmann, Ch. E., Eichler, B., Gäggeler, H. W., Gregorich, K. E., Hoffman, D. C., Hübener, S., Jost, D. T., Kirbach, U. W., Laue, C. A., Lavanchy, V. M., Nitsche, H., Patin, J. B., Piguet, D., Schädel, M., Shaughnessy, D. A., Strellis, D. A., Taut, S., Tobler, L., Tsyganov, Y. S., Türler, A., Vahle, A., Wilk, P. A., and Yakushev, A. B.

Published
2000

37. Chemical properties of element 106 (seaborgium)

Author

Schädel, M., Brüchle, W., Dressler, R., Eichler, B., Gäggeler, H. W., Günther, R., Gregorich, K. E., Hoffman, D. C., Hübener, S., Jost, D. T., Kratz, J. V., Paulus, W., Schumann, D., Timokhin, S., Trautmann, N., Türler, A., Wirth, G., and Yakuschev, A.

Published
1997
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38. Low-lying states in 219Ra and 215Rn : Sampling microsecond α-decaying nuclei

Author

Såmark-Roth, A., Sarmiento, L. G., Rudolph, D., Ljungberg, J., Carlsson, B. G., Fahlander, C., Forsberg, U., Golubev, P., Ragnarsson, I., Ackermann, D., Andersson, L. L., Block, M., Brand, H., Cox, D. M., Di Nitto, A., Düllmann, Ch E., Eberhardt, K., Even, J., Gates, J. M., Gerl, J., Gregorich, K. E., Gross, C. J., Herzberg, R. D., Heßberger, F. P., Jäger, E., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Omtvedt, J. P., Papadakis, P., Runke, J., Rykaczewski, K., Schädel, M., Schaffner, H., Schausten, B., Thörle-Pospiech, P., Trautmann, N., Torres, T., Türler, A., Ward, A., Wiehl, N., and Yakushev, A.

Subjects
alpha decay, gamma-ray spectroscopy, nuclear shell model, pulse shape analysis, Subatomic Physics, half life, Nilsson-Strutinsky calculations
Abstract

Short-lived α-decaying nuclei "northeast" of 208Pb in the chart of nuclides were studied using the reaction 48Ca+243Am with the decay station TASISpec at TASCA, GSI Darmstadt. Decay energies and times from pile-up events were extracted with a tailor-made pulse-shape analysis routine and specific α-decay chains were identified in a correlation analysis. Decay chains starting with the even-even 220Ra and its odd-A neighbors, 219Fr, and 219,221Ra, with a focus on the 219Ra→215Rn decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of 219Ra is proposed, including a new decay branch from a previously not considered isomeric state at 17 keV excitation energy. Conclusions on nuclear structure are drawn from the experimental data, aided by Geant4 simulations and a discussion on theoretical calculations.

Published
2018

39. Study of non-fusion products in the 50Ti+249Cf reaction

Author

Di Nitto, A., Khuyagbaatar, J., Ackermann, D., Andersson, L.-L., Badura, E., Block, M., Brand, H., Conrad, I., Cox, D. M., Düllmann, Ch. E., Dvorak, J., Eberhardt, K., Ellison, P. A., Esker, N. E., Even, J., Fahlander, C., Forsberg, U., Gates, J. M., Golubev, P., Gothe, O., Gregorich, K. E., Hartmann, W., Herzberg, R. D., Heßberger, F. P., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Klein, S., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lahiri, S., Lommel, B., Maiti, M., Mändl, R., Merchán, E., Minami, S., Mistry, A. K., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Renisch, D., Rudolph, D., Runke, J., Sarmiento, L. G., Schädel, M., and Research unit Nuclear & Hadron Physics

Subjects
COLLISIONS, PROBABILITY, CA-48+CM-248, production of radioactive nuclei, U-238, ELEMENTS, ISOTOPES, MULTINUCLEON TRANSFER-REACTIONS, HEAVY, Nuclear Experiment, FISSION, BARRIER
Abstract

The isotopic distribution of nuclei produced in the 50Ti + 249Cf reaction has been studied at the gas-filled recoil separator TASCA at GSI Darmstadt, which separates ions according to differences in magnetic rigidity. The bombardment was performed at an energy around the Bass barrier and with the TASCA magnetic fields set for collecting fusion-evaporation reaction products. Fifty-three isotopes located “north-east” of 208Pb were identified as recoiling products formed in non-fusion channels of the reaction. These recoils were implanted with energies in two distinct ranges; besides one with higher energy, a significant low-energy contribution was identified. The latter observation was not expected to occur according to kinematics of the known types of reactions, namely quasi-elastic, multi-nucleon transfer, deep-inelastic collisions or quasifission. The present observations are discussed within the framework of two-body kinematics passing through the formation of a composite system.

Published
2018

40. ATOM-AT-A-TIME RADIOCHEMICAL SEPARATIONS OF THE HEAVIEST ELEMENTS: LAWRENCIUM CHEMISTRY

Author

HOFFMAN, D. C., primary, HENDERSON, R. A., additional, GREGORICH, K. E., additional, BENNETT, D. A., additional, CHASTELER, R. M., additional, GANNETT, C. M., additional, HALL, H. L., additional, LEE, D. M., additional, NURMIA, M. J., additional, CAI, S., additional, AGARWAL, R., additional, CHARLOP, A. W., additional, CHU, Y. Y., additional, SEABORG, G. T., additional, and SILVA, R. J., additional

Published
1994
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41. Excitation functions for production of heavy actinides from interactions of 40Ca and 48Ca ions with 248Cm

Author

Hoffman, Darleane C., primary, Fowler, M. M., additional, Daniels, W. R., additional, von Gunten, H. R., additional, Lee, Diana, additional, Moody, K. J., additional, Gregorich, K., additional, Welch, R., additional, Seaborg, G. T., additional, Brüchle, W., additional, Brügger, M., additional, Gäggeler, H., additional, Schädel, M., additional, Sümmerer, K., additional, Wirth, G., additional, Blaich, Th., additional, Herrmann, G., additional, Hildebrand, N., additional, Kratz, J. V., additional, Lerch, M., additional, and Trautmann, N., additional

Published
1994
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42. Attempts to Produce Superheavy Elements by Fusion of 48Ca with 248Cm in the Bombarding Energy Range of 4.5–5.2 MeV/u

Author

Armbruster, P., primary, Agarwal, Y. K., additional, Brüchle, W., additional, Brügger, M., additional, Dufour, J. P., additional, Gäggeler, H., additional, Hessberger, F. P., additional, Hofmann, S., additional, Lemmertz, P., additional, Münzenberg, G., additional, Poppensieker, K., additional, Reisdorf, W., additional, Schädel, M., additional, Schmidt, K.-H., additional, Schneider, J. H. R., additional, Schneider, W. F. W., additional, Sümmerer, K., additional, Vermeulen, D., additional, Wirth, G., additional, Ghiorso, A., additional, Gregorich, K. E., additional, Lee, D., additional, Leino, M., additional, Moody, K. J., additional, Seaborg, G. T., additional, Welch, R. B., additional, Wilmarth, P., additional, Yashita, S., additional, Frink, C., additional, Greulich, N., additional, Herrmann, G., additional, Hickmann, U., additional, Hildebrand, N., additional, Kratz, J. V., additional, Trautmann, N., additional, Fowler, M. M., additional, Hoffman, D. C., additional, Daniels, W. R., additional, von Gunten, H. R., additional, and Dornhöfer, H., additional

Published
1994
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43. Study of non-fusion products in the 50Ti + 249Cf reaction

Author

Di Nitto, Antonio, Khuyagbaatar, J., Ackermann, Dieter, Andersson, L.-L., Badura, E., Block, M., Brand, H., Conrad, I., Cox, D. M., Düllmann, Christoph Emanuel, Dvorak, Jan, Eberhardt, K., Ellison, P. A., Esker, N. E., Even, Julia, Fahlander, C., Forsberg, U., Gates, J. M., Golubev, P., Gothe, O., Gregorich, K. E., Hartmann, W., Herzberg, R. D., Heßberger, F., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Klein, S., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lahiri, S., Lommel, B., Maiti, M., Mändl, R., Merchán, E., Minami, S., Mistry, A. K., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Renisch, D., Rudolph, D., Runke, J., Sarmiento, L. G., Schädel, M., Schaffner, H., Schausten, B., Semchenkov, A., Steiner, J., Thörle-Pospiech, P., Trautmann, N., Türler, A., Uusitalo, J., Ward, D., Wegrzecki, M., Wieczorek, P., Wiehl, N., Yakushev, A., and Yakusheva, V.

Subjects
ydinreaktiot, production of radioactive nuclei, ddc:530, multi-nucleon transfer reactions, quasifission, Nuclear Experiment, α decay, ydinfysiikka
Abstract

Physics letters / B B 784, 199 - 205 (2018). doi:10.1016/j.physletb.2018.07.058, Published by North-Holland Publ., Amsterdam

Published
2018
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44. Fusion reaction Ca48+Bk249 leading to formation of the element Ts ( Z=117 )

Author

Khuyagbaatar, J., primary, Yakushev, A., additional, Düllmann, Ch. E., additional, Ackermann, D., additional, Andersson, L.-L., additional, Asai, M., additional, Block, M., additional, Boll, R. A., additional, Brand, H., additional, Cox, D. M., additional, Dasgupta, M., additional, Derkx, X., additional, Di Nitto, A., additional, Eberhardt, K., additional, Even, J., additional, Evers, M., additional, Fahlander, C., additional, Forsberg, U., additional, Gates, J. M., additional, Gharibyan, N., additional, Golubev, P., additional, Gregorich, K. E., additional, Hamilton, J. H., additional, Hartmann, W., additional, Herzberg, R.-D., additional, Heßberger, F. P., additional, Hinde, D. J., additional, Hoffmann, J., additional, Hollinger, R., additional, Hübner, A., additional, Jäger, E., additional, Kindler, B., additional, Kratz, J. V., additional, Krier, J., additional, Kurz, N., additional, Laatiaoui, M., additional, Lahiri, S., additional, Lang, R., additional, Lommel, B., additional, Maiti, M., additional, Miernik, K., additional, Minami, S., additional, Mistry, A., additional, Mokry, C., additional, Nitsche, H., additional, Omtvedt, J. P., additional, Pang, G. K., additional, Papadakis, P., additional, Renisch, D., additional, Roberto, J., additional, Rudolph, D., additional, Runke, J., additional, Rykaczewski, K. P., additional, Sarmiento, L. G., additional, Schädel, M., additional, Schausten, B., additional, Semchenkov, A., additional, Shaughnessy, D. A., additional, Steinegger, P., additional, Steiner, J., additional, Tereshatov, E. E., additional, Thörle-Pospiech, P., additional, Tinschert, K., additional, Torres De Heidenreich, T., additional, Trautmann, N., additional, Türler, A., additional, Uusitalo, J., additional, Ward, D. E., additional, Wegrzecki, M., additional, Wiehl, N., additional, Van Cleve, S. M., additional, and Yakusheva, V., additional

Published
2019
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46. Heavy element formation in compound nucleus reactions with 238U targets

Author

Gregorich, K., primary, Dullman, C., additional, Loveland, W., additional, Folden, III, C., additional, Gates, Jacklyn, additional, Garcia, M., additional, Sudowe, R., additional, Stavestra, L., additional, Dragojevic, I., additional, Nelson, S., additional, Pang, G., additional, Zielinski, P., additional, Chung, Y., additional, Eichler, R., additional, Schaedel, M., additional, Teurler, A., additional, Yakushev, A., additional, Dvorak, J., additional, Hoffman, D., additional, and Nitsche, H., additional

Published
2007
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47. First Direct Measurements of Superheavy-Element Mass Numbers

Author

Gates, J. M., primary, Pang, G. K., additional, Pore, J. L., additional, Gregorich, K. E., additional, Kwarsick, J. T., additional, Savard, G., additional, Esker, N. E., additional, Kireeff Covo, M., additional, Mogannam, M. J., additional, Batchelder, J. C., additional, Bleuel, D. L., additional, Clark, R. M., additional, Crawford, H. L., additional, Fallon, P., additional, Hubbard, K. K., additional, Hurst, A. M., additional, Kolaja, I. T., additional, Macchiavelli, A. O., additional, Morse, C., additional, Orford, R., additional, Phair, L., additional, and Stoyer, M. A., additional

Published
2018
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48. Low-lying states in Ra219 and Rn215 : Sampling microsecond α -decaying nuclei

Author

Såmark-Roth, A., primary, Sarmiento, L. G., additional, Rudolph, D., additional, Ljungberg, J., additional, Carlsson, B. G., additional, Fahlander, C., additional, Forsberg, U., additional, Golubev, P., additional, Ragnarsson, I., additional, Ackermann, D., additional, Andersson, L.-L., additional, Block, M., additional, Brand, H., additional, Cox, D. M., additional, Di Nitto, A., additional, Düllmann, Ch. E., additional, Eberhardt, K., additional, Even, J., additional, Gates, J. M., additional, Gerl, J., additional, Gregorich, K. E., additional, Gross, C. J., additional, Herzberg, R.-D., additional, Heßberger, F. P., additional, Jäger, E., additional, Khuyagbaatar, J., additional, Kindler, B., additional, Kojouharov, I., additional, Kratz, J. V., additional, Krier, J., additional, Kurz, N., additional, Lommel, B., additional, Mistry, A., additional, Mokry, C., additional, Omtvedt, J. P., additional, Papadakis, P., additional, Runke, J., additional, Rykaczewski, K., additional, Schädel, M., additional, Schaffner, H., additional, Schausten, B., additional, Thörle-Pospiech, P., additional, Trautmann, N., additional, Torres, T., additional, Türler, A., additional, Ward, A., additional, Wiehl, N., additional, and Yakushev, A., additional

Published
2018
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49. Gas Phase Chromatography Experiments with Bromides of Tantalum and Element 105

Author

Gäggeler, H. W., Jost, D. T., Kovacs, J., Scherer, U. W, Weber, A., Vermeulen, D., Türler, A., Gregorich, K. E., Henderson, R. A., Czerwinski, K. R., Kadkhodayan, B., Lee, D. M., Nurmia, M., Hoffman, D. C., Kratz, J. V., Gober, M. K., Zimmermann, H. P., Schädel, M., Brüchle, W., Schimpf, E., Zvara, I., Gäggeler, H. W., Jost, D. T., Kovacs, J., Scherer, U. W, Weber, A., Vermeulen, D., Türler, A., Gregorich, K. E., Henderson, R. A., Czerwinski, K. R., Kadkhodayan, B., Lee, D. M., Nurmia, M., Hoffman, D. C., Kratz, J. V., Gober, M. K., Zimmermann, H. P., Schädel, M., Brüchle, W., Schimpf, E., and Zvara, I.

Published
2017

50. Recoil-α-fission and recoil-α-α-fission events observed in the reaction 48Ca + 243Am

Author

Forsberg, U., Rudolph, D., Andersson, L. -L., Nitto, A. Di, Düllmann, Ch E., Gates, J. M., Golubev, P., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., Hessberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Sarmiento, L. G., Schädel, M., Yakushev, A., Åberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Dobaczewski, Jacek Jan, Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jäger, E., Kindler, B., Krier, J., Kojouharov, I., Kurz, N., Lommel, B., Mistry, A., Mokry, C., Nazarewicz, W., Nitsche, H., Omtvedt, J. P., Papadakis, P., Ragnarsson, I., Runke, J., Schaffner, H., Schausten, B., Shi, Y., Thörle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Türler, A., Ward, A., Ward, D. E., and Wiehl, N.

Subjects
Quantum Physics, Uup, alpha decay, Superheavy elements, Spontaneous fission, Molecular, nucl-ex, Nuclear & Particles Physics, Atomic, Particle and Plasma Physics, Nuclear, Element 115, Nuclear Experiment, Astronomical and Space Sciences
Abstract

Products of the fusion-evaporation reaction 48Ca + 243Am were studied with the TASISpec set-up at the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung, Darmstadt, Germany. Amongst the detected thirty correlated α-decay chains associated with the production of element Z=115, two recoil-α-fission and five recoil-α-α-fission events were observed. The latter five chains are similar to four such events reported from experiments performed at the Dubna gas-filled separator, and three such events reported from an experiment at the Berkeley gas-filled separator. The four chains observed at the Dubna gas-filled separator were assigned to start from the 2n-evaporation channel 289115 due to the fact that these recoil-α-α-fission events were observed only at low excitation energies. Contrary to this interpretation, we suggest that some of these recoil-α-α-fission decay chains, as well as some of the recoil-α-α-fission and recoil-α-fission decay chains reported from Berkeley and in this article, start from the 3n-evaporation channel 288115.

Published
2016

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