Search

Your search keyword '"Schausten B"' showing total 209 results
Start Over Author "Schausten B"
209 results on '"Schausten B"'

1. On the decay properties of the neutron-deficient isotope 242Es

Author

Khuyagbaatar, J., Cantemir, R. A., Duellmann, Ch. E., Jaeger, E., Kindler, B., Krier, J., Kurz, N., Lommel, B., Schausten, B., and Yakushev, A.

Subjects
Nuclear Experiment
Abstract

The radioactive decay properties of $^{242}$Es were studied with significantly improved statistics compared to available literature data. This isotope was produced in the 3n evaporation channel of the fusion reaction of $^{48}$Ca+$^{197}$Au. A half-life of 16.9(8)~s was deduced from 662 $\alpha$ decays of $^{242}$Es, resulting in an $\alpha$-decay branching of 41(3)\%. Twenty-six fission events with a half-life of 18.2$^{+4.5}_{-3.0}$~s were assigned to originate from the electron-capture delayed fission of $^{242}$Es. The probability for the electron-capture delayed fission was measured to be 0.015(4), which improves and resolves ambiguities in available experimental data. We discuss all known cases for electron-capture delayed fission in Es, Bk, and Am isotopes and compare experimental data with predictions from a recent semi-empirical model. A cross section of 27(3)~nb was measured for the production of $^{242}$Es.

Published
2024
Full Text
View/download PDF

2. Fission in the landscape of heaviest elements: Some recent examples

Author

Khuyagbaatar J., Yakushev A., Düllmann Ch.E., Ackermann D., Andersson L.-L., Block M., Brand H., Even J., Forsberg U., Hartmann W., Herzberg R.-D., Heßberger F.P., Hoffmann J., Hübner A., Jäger E., Jeppsson J., Kindler B., Kratz J.V., Krier J., Kurz N., Lommel B., Maiti M., Minami S., Rudolph D., Runke J., Sarmiento L.G., Schädel M., Schausten B., Steiner J., Heidenreich T. Torres De, Uusitalo J., Wiehl N., and Yakusheva V.

Subjects
Physics, QC1-999
Abstract

The fission process still remains a main factor that determines the stability of the atomic nucleus of heaviest elements. Fission half-lives vary over a wide range, 10−19−1024 s. Present experimental techniques for the synthesis of the superheavy elements that usually measure α-decay chains are sensitive only in a limited range of half-lives, often 10−5−103 s. In the past years, measurement techniques for very short-lived and very long-lived nuclei were significantly improved at the gas-filled recoil separator TASCA at GSI Darmstadt. Recently, several experimental studies of fission-related phenomena have successfully been performed. In this paper, results on 254−256Rf and 266Lr are presented and corresponding factors for retarding the fission process are discussed.

Published
2016
Full Text
View/download PDF

3. Spectroscopic Tools Applied to Element Z = 115 Decay Chains

Author

Forsberg U., Rudolph D., Golubev P., Sarmiento L.G., Yakushev A., Andersson L.-L., Nitto A. Di, Düllmann Ch.E., Gates J.M., Gregorich K.E., Gross C.J., Heßberger F.P., Herzberg R.-D., 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 and N.

Subjects
Physics, QC1-999
Abstract

Nuclides that are considered to be isotopes of element Z = 115 were produced in the reaction 48Ca + 243Am at the GSI Helmholtzzentrum für Schwerionenforschung Darmstadt. The detector setup TASISpec was used. It was mounted behind the gas-filled separator TASCA. Thirty correlated α-decay chains were found, and the energies of the particles were determined with high precision. Two important spectroscopic aspects of the offline data analysis are discussed in detail: the handling of digitized preamplified signals from the silicon strip detectors, and the energy reconstruction of particles escaping to upstream detectors relying on pixel-by-pixel dead-layer thicknesses.

Published
2014
Full Text
View/download PDF

4. Spectroscopy along Flerovium Decay Chains: Discovery of Ds280 and an Excited State in Cn282

Author

Såmark-Roth, A, Cox, DM, Rudolph, D, Sarmiento, LG, Carlsson, BG, Egido, JL, Golubev, P, Heery, J, Yakushev, A, Åberg, S, Albers, HM, Albertsson, M, Block, M, Brand, H, Calverley, T, Cantemir, R, Clark, RM, Düllmann, Ch E, Eberth, J, Fahlander, C, Forsberg, U, Gates, JM, Giacoppo, F, Götz, M, Götz, S, Herzberg, R-D, Hrabar, Y, Jäger, E, Judson, D, Khuyagbaatar, J, Kindler, B, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lens, L, Ljungberg, J, Lommel, B, Louko, J, Meyer, C-C, Mistry, A, Mokry, C, Papadakis, P, Parr, E, Pore, JL, Ragnarsson, I, Runke, J, Schädel, M, Schaffner, H, Schausten, B, Shaughnessy, DA, Thörle-Pospiech, P, Trautmann, N, and Uusitalo, J

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Mathematical Sciences, Engineering, General Physics, Mathematical sciences, Physical sciences
Abstract

A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions ^{48}Ca+^{242}Pu and ^{48}Ca+^{244}Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to ^{286}Fl and ^{288}Fl, respectively. A prompt coincidence between a 9.60(1)-MeV α particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely ^{282}Cn. Spectroscopy of ^{288}Fl decay chains fixed Q_{α}=10.06(1)  MeV. In one case, a Q_{α}=9.46(1)-MeV decay from ^{284}Cn into ^{280}Ds was observed, with ^{280}Ds fissioning after only 518  μs. The impact of these findings, aggregated with existing data on decay chains of ^{286,288}Fl, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

Published
2021

5. Spectroscopy along Flerovium Decay Chains: Discovery of ^{280}Ds and an Excited State in ^{282}Cn.

Author

Såmark-Roth, A, Cox, DM, Rudolph, D, Sarmiento, LG, Carlsson, BG, Egido, JL, Golubev, P, Heery, J, Yakushev, A, Åberg, S, Albers, HM, Albertsson, M, Block, M, Brand, H, Calverley, T, Cantemir, R, Clark, RM, Düllmann, Ch E, Eberth, J, Fahlander, C, Forsberg, U, Gates, JM, Giacoppo, F, Götz, M, Götz, S, Herzberg, R-D, Hrabar, Y, Jäger, E, Judson, D, Khuyagbaatar, J, Kindler, B, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lens, L, Ljungberg, J, Lommel, B, Louko, J, Meyer, C-C, Mistry, A, Mokry, C, Papadakis, P, Parr, E, Pore, JL, Ragnarsson, I, Runke, J, Schädel, M, Schaffner, H, Schausten, B, Shaughnessy, DA, Thörle-Pospiech, P, Trautmann, N, and Uusitalo, J

Subjects
General Physics, Mathematical Sciences, Physical Sciences, Engineering
Abstract

A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions ^{48}Ca+^{242}Pu and ^{48}Ca+^{244}Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to ^{286}Fl and ^{288}Fl, respectively. A prompt coincidence between a 9.60(1)-MeV α particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely ^{282}Cn. Spectroscopy of ^{288}Fl decay chains fixed Q_{α}=10.06(1)  MeV. In one case, a Q_{α}=9.46(1)-MeV decay from ^{284}Cn into ^{280}Ds was observed, with ^{280}Ds fissioning after only 518  μs. The impact of these findings, aggregated with existing data on decay chains of ^{286,288}Fl, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

Published
2021

6. Spectroscopic Tools Applied to Flerovium Decay Chains

Author

Cox, DM, Såmark-Roth, A, Rudolph, D, Sarmiento, LG, Fahlander, C, Forsberg, U, Golubev, P, Heery, JAM, Yakushev, A, Albers, HM, Block, M, Brand, H, Clark, RM, Düllmann, Ch E, Eberth, J, Gates, JM, Giacoppo, F, Götz, M, Götz, S, Herzberg, R-D, Jäger, E, Kindler, B, Khuyagbaatar, J, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lens, L, Lommel, B, Mistry, A, Meyer, C-C, Mokry, C, Papadakis, P, Pore, JL, Runke, J, Thörle-Pospiech, P, Trautmann, N, Schaffner, H, Schausten, B, and Uusitalo, J

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Condensed Matter Physics, Other Physical Sciences, Physical sciences
Abstract

An upgraded TASISpec setup, with the addition of a veto DSSD and the new Compex detector-germanium array, has been employed with the gas-filled recoil separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, to study flerovium (element 114) decay chains. The detector upgrades along with development of new analytical techniques have improved the sensitivity of the TASISpec setup for measuring α-photon coincidences. These improvements have been assessed with test reactions. The reaction 48Ca+206,207Pb was used for verification of experimental parameters such as transmission to implantation DSSD and target-segment to α-decay correlations. The reaction 48Ca+ nat Hf was used to produce several short-lived nuclei with multiple-α decay chains to investigate pile-up event deconvolution.

Published
2020

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

Author

Khuyagbaatar, J, Yakushev, A, Düllmann, CE, Ackermann, D, Andersson, LL, Asai, M, Block, M, Boll, RA, Brand, H, Cox, DM, Dasgupta, M, Derkx, X, Di Nitto, A, Eberhardt, K, Even, J, Evers, M, Fahlander, C, Forsberg, U, Gates, JM, Gharibyan, N, Golubev, P, Gregorich, KE, Hamilton, JH, Hartmann, W, Herzberg, RD, Heßberger, FP, Hinde, DJ, Hoffmann, J, Hollinger, R, Hübner, A, Jäger, E, Kindler, B, Kratz, JV, 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, JP, Pang, GK, Papadakis, P, Renisch, D, Roberto, J, Rudolph, D, Runke, J, Rykaczewski, KP, Sarmiento, LG, Schädel, M, Schausten, B, Semchenkov, A, Shaughnessy, DA, Steinegger, P, Steiner, J, Tereshatov, EE, Thörle-Pospiech, P, Tinschert, K, Torres De Heidenreich, T, Trautmann, N, Türler, A, Uusitalo, J, Ward, DE, Wegrzecki, M, Wiehl, N, Van Cleve, SM, and Yakusheva, V

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

8. Fusion reaction Ca48+Bk249 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, RA, Brand, H, Cox, DM, Dasgupta, M, Derkx, X, Di Nitto, A, Eberhardt, K, Even, J, Evers, M, Fahlander, C, Forsberg, U, Gates, JM, Gharibyan, N, Golubev, P, Gregorich, KE, Hamilton, JH, Hartmann, W, Herzberg, R-D, Heßberger, FP, Hinde, DJ, Hoffmann, J, Hollinger, R, Hübner, A, Jäger, E, Kindler, B, Kratz, JV, 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, JP, Pang, GK, Papadakis, P, Renisch, D, Roberto, J, Rudolph, D, Runke, J, Rykaczewski, KP, Sarmiento, LG, Schädel, M, Schausten, B, Semchenkov, A, Shaughnessy, DA, Steinegger, P, Steiner, J, Tereshatov, EE, Thörle-Pospiech, P, Tinschert, K, De Heidenreich, T Torres, Trautmann, N, Türler, A, Uusitalo, J, Ward, DE, Wegrzecki, M, Wiehl, N, Van Cleve, SM, and Yakusheva, V

Subjects
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
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

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

Author

Såmark-Roth, A, Sarmiento, LG, Rudolph, D, Ljungberg, J, Carlsson, BG, Fahlander, C, Forsberg, U, Golubev, P, Ragnarsson, I, Ackermann, D, Andersson, LL, Block, M, Brand, H, Cox, DM, Di Nitto, A, Düllmann, CE, Eberhardt, K, Even, J, Gates, JM, Gerl, J, Gregorich, KE, Gross, CJ, Herzberg, RD, Heßberger, FP, Jäger, E, Khuyagbaatar, J, Kindler, B, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lommel, B, Mistry, A, Mokry, C, Omtvedt, JP, 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

Abstract

Short-lived α-decaying nuclei "northeast" of Pb208 in the chart of nuclides were studied using the reaction Ca48+Am243 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 Ra220 and its odd-A neighbors, Fr219, and Ra221,219, with a focus on the Ra219→Rn215 decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of Ra219 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

10. Low-lying states in Ra219 and Rn215: Sampling microsecond α-decaying nuclei

Author

Såmark-Roth, A, Sarmiento, LG, Rudolph, D, Ljungberg, J, Carlsson, BG, Fahlander, C, Forsberg, U, Golubev, P, Ragnarsson, I, Ackermann, D, Andersson, L-L, Block, M, Brand, H, Cox, DM, Di Nitto, A, Düllmann, Ch E, Eberhardt, K, Even, J, Gates, JM, Gerl, J, Gregorich, KE, Gross, CJ, Herzberg, R-D, Heßberger, FP, Jäger, E, Khuyagbaatar, J, Kindler, B, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lommel, B, Mistry, A, Mokry, C, Omtvedt, JP, 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
Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
Abstract

Short-lived α-decaying nuclei "northeast" of Pb208 in the chart of nuclides were studied using the reaction Ca48+Am243 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 Ra220 and its odd-A neighbors, Fr219, and Ra221,219, with a focus on the Ra219→Rn215 decay, were studied by means of α-γ spectroscopy. A revised α-decay scheme of Ra219 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

11. Study of non-fusion products in the Ti50+Cf249 reaction

Author

Di Nitto, A, Khuyagbaatar, J, Ackermann, D, Andersson, LL, Badura, E, Block, M, Brand, H, Conrad, I, Cox, DM, Düllmann, CE, Dvorak, J, Eberhardt, K, Ellison, PA, Esker, NE, Even, J, Fahlander, C, Forsberg, U, Gates, JM, Golubev, P, Gothe, O, Gregorich, KE, Hartmann, W, Herzberg, RD, Heßberger, FP, Hoffmann, J, Hollinger, R, Hübner, A, Jäger, E, Kindler, B, Klein, S, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lahiri, S, Lommel, B, Maiti, M, Mändl, R, Merchán, E, Minami, S, Mistry, AK, Mokry, C, Nitsche, H, Omtvedt, JP, Pang, GK, Renisch, D, Rudolph, D, Runke, J, Sarmiento, LG, 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
Production of radioactive nuclei, alpha decay, Multi-nucleon transfer reactions, Quasifission, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
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

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

Author

Di Nitto, A, Khuyagbaatar, J, Ackermann, D, Andersson, L-L, Badura, E, Block, M, Brand, H, Conrad, I, Cox, DM, Düllmann, Ch E, Dvorak, J, Eberhardt, K, Ellison, PA, Esker, NE, Even, J, Fahlander, C, Forsberg, U, Gates, JM, Golubev, P, Gothe, O, Gregorich, KE, Hartmann, W, Herzberg, RD, Heßberger, FP, Hoffmann, J, Hollinger, R, Hübner, A, Jäger, E, Kindler, B, Klein, S, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lahiri, S, Lommel, B, Maiti, M, Mändl, R, Merchán, E, Minami, S, Mistry, AK, Mokry, C, Nitsche, H, Omtvedt, JP, Pang, GK, Renisch, D, Rudolph, D, Runke, J, Sarmiento, LG, 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
Production of radioactive nuclei, alpha decay, Multi-nucleon transfer reactions, Quasifission, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics
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

13. Decay properties of the neutron-deficient isotope Es242

Author

Khuyagbaatar, J., primary, Cantemir, R. A., additional, Düllmann, Ch. E., additional, Jäger, E., additional, Kindler, B., additional, Krier, J., additional, Kurz, N., additional, Lommel, B., additional, Schausten, B., additional, and Yakushev, A., additional

Published
2024
Full Text
View/download PDF

14. 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
Full Text
View/download PDF

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

Author

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

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Superheavy elements, Element 115, Uup, alpha decay, Spontaneous fission, nucl-ex, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Quantum Physics, Nuclear & Particles Physics, Astronomical sciences, Nuclear and plasma physics, Particle and high energy physics
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

17. Alpha-photon coincidence spectroscopy along element 115 decay chains

Author

Rudolph, D, Forsberg, U, Golubev, P, Sarmiento, LG, Yakushev, A, Andersson, LL, Di Nitto, A, Düllmann, CE, Gates, JM, Gregorich, KE, Gross, CJ, Herzberg, RD, Hessbberger, FP, Khuyagbaatar, J, Kratz, JV, Rykaczewski, K, Schädel, M, Åberg, S, Ackermann, D, Block, M, Brand, H, Carlsson, BG, 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, JP, Papadakis, P, Ragnarsson, I, Runke, J, Schaffner, H, Schausten, B, Thörle-Pospiech, P, Torres, T, Traut, T, Trautmann, N, Türler, A, Ward, DE, and Wiehl, N

Subjects
Nuclear & Particles Physics, Mathematical Sciences, Physical Sciences
Abstract

Produced in the reaction 48Ca+243Am, thirty correlated α-decay chains were observed in an experiment conducted at the GSI Helmholzzentrum für Schwerionenforschung, Darmstadt, Germany. The decay chains are basically consistent with previous findings and are considered to originate from isotopes of element 115 with mass numbers 287, 288, and 289. A set-up aiming specifically for high-resolution charged particle and photon coincidence spectroscopy was placed behind the gas-filled separator TASCA. For the first time, γ rays as well as X-ray candidates were observed in prompt coincidence with the α-decay chains of element 115.

Published
2014

18. Experimental study of the U238(S36,3-5n)Hs269-271 reaction leading to the observation of Hs270

Author

Graeger, R, Ackermann, D, Chelnokov, M, Chepigin, V, Düllmann, CE, Dvorak, J, Even, J, Gorshkov, A, Heßberger, FP, Hild, D, Hübner, A, Jäger, E, Khuyagbaatar, J, Kindler, B, Kratz, JV, Krier, J, Kuznetsov, A, Lommel, B, Nishio, K, Nitsche, H, Omtvedt, JP, Petrushkin, O, Rudolph, D, Runke, J, Samadani, F, Schädel, M, Schausten, B, Türler, A, Yakushev, A, and Zhi, Q

Subjects
Nuclear & Particles Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Atomic, Molecular, Nuclear, Particle and Plasma Physics
Abstract

The deformed doubly magic nucleus Hs270 has so far only been observed as the four-neutron (4n) evaporation residue of the reaction Mg26+Cm248, where a maximum cross section of 3 pb was measured. Theoretical studies on the formation of Hs270 in the 4n evaporation channel of fusion reactions with different entrance channel asymmetry in the framework of a two-parameter Smoluchowski equation predict that the reactions Ca48+Ra226 and S36+U238 result in higher cross sections due to lower reaction Q values, in contrast to simple arguments based on the reaction asymmetry, which predict opposite trends. Calculations using hivap predict cross sections for the reaction S36+U238 that are similar to those of the Mg26+Cm248 reaction. Here, we report on the first measurement of evaporation residues formed in the complete nuclear fusion reaction S36+U238 and the observation of Hs270, which is produced in the 4n evaporation channel, with a measured cross section of 0.8-0.7+2.6 pb at 51-MeV excitation energy. The one-event cross-section limits (68% confidence level) for the 3n, 4n, and 5n evaporation channels at 39-MeV excitation energy are 2.9 pb, while the cross-section limits of the 3n and 5n channel at 51 MeV are 1.5 pb. This is significantly lower than the 5n cross section of the Mg26+Cm248 reaction at similar excitation energy. © 2010 The American Physical Society.

Published
2010

19. Doubly magic nucleus 270Hs

Author

Dvorak, J., Bruchle, W., Chelnokov, M., Dullmann, Christoph E., Dvorakova, Z., Eberhardt, K., Jager, Egon, Krucken, R., Kuznetsov, A., Nishio, K., Qin, Z., Schadel, Matthias, Schausten, B., Schimpf, E., Schuber, R., Semchenkov, A., Thorle, P., Turler, A., Wegrzecki, M., Wierczinski, B., Yakushev, A., and Yeremin, A.

Abstract

Investigating short-lived nuclei using rapid chemical separation and subsequent on-line detection methods provides an independent and alternative means to electromagnetic on-line separators. The predicted enhanced stability around 270Hs has major importance for the experimental investigation of superheavy elements by chemical means. Chemical separation of Hs in the form of HsO4 provides an excellent tool to study the formation reactions and nuclear structure of nuclei close to the deformed nuclear shells at Z=108 and N=162. Here we report on results of a recent Hs chemistry experiments performed at GSI Darmstadt. Element 108, hassium, was produced in the reaction 248Cm(26Mg,xn)274 xHs and chemically isolated. Observed decay chains were attributed to the decays of three different Hs isotopes - 269-271Hs. The observed decay properties provide strong indications for enhanced stability in this area of the heaviest known elements. New decay properties for these Hs isotopes and their daughters are discussed.

Published
2008

20. Radiochemical study of the kinematics of multi-nucleon transfer reactions in 48Ca + 248Cm collisions 10% above the Coulomb barrier

Author

Götz, M., Götz, S., Kratz, J.V., Düllmann, Ch.E., Mokry, Ch., Runke, J., Thörle-Pospiech, P., Wiehl, N., Schädel, M., Ballof, J., Dorrer, H., Grund, J., Huber, D., Jäger, E., Keller, O., Krier, J., Khuyagbaatar, J., Lens, L., Lommel, B., Mendel, M., Moody, K.J., Scharrer, P., Schausten, B., Shaughnessy, D., Schmitt, M., Steiner, J., Trautmann, N., Yakushev, A., and Yakusheva, V.

Published
2017
Full Text
View/download PDF

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

Author

Forsberg, U., Rudolph, D., Andersson, L.-L., Di Nitto, A., Düllmann, Ch.E., Fahlander, C., 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., 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, Yue, Thörle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Türler, A., Ward, A., Ward, D.E., and Wiehl, N.

Published
2016
Full Text
View/download PDF

22. On the adsorption and reactivity of element 114, flerovium

Author

Yakushev, A., Lens, Lotte, Düllmann, Ch. E., Khuyagbaatar, J., Jäger, E., Krier, J., Runke, J., Albers, H. M., Asai, M., Block, M., Despotopulos, J., Di Nitto, Antonio, Eberhardt, K., Forsberg, U., Golubev, P., Götz, M., Götz, Stefan, Haba, H., Harkness-Brennan, L., Herzberg, R.-D., Heßberger, F., Hinde, D., Hübner, A., Judson, D., Kindler, B., Komori, Y., Konki, J., Kratz, J. V., Kurz, N., Laatiaoui, Mustapha, Lahiri, S., Lommel, B., Maiti, M., Mistry, A. K., Mokry, Ch., Moody, K. J., Nagame, Y., Omtvedt, J. P., Papadakis, P., Pershina, V., Rudolph, D., Samiento, L. G., Sato, T. K., Schädel, M., Scharrer, P., Schausten, B., Shaughnessy, D. A., Steiner, J., Thörle-Pospiech, P., Toyoshima, A., Trautmann, N., Tsukada, K., Uusitalo, J., Voss, K.-O., Ward, A., Wegrzecki, M., Wiehl, N., Williams, E., Yakusheva, V., Yakushev, A., Lens, L., Dullmann, C. E., Khuyagbaatar, J., Jager, E., Krier, J., Runke, J., Albers, H. M., Asai, M., Block, M., Despotopulos, J., Di Nitto, A., Eberhardt, K., Forsberg, U., Golubev, P., Gotz, M., Gotz, S., Haba, H., Harkness-Brennan, L., Herzberg, R. -D., Hessberger, F. P., Hinde, D., Hubner, A., Judson, D., Kindler, B., Komori, Y., Konki, J., Kratz, J. V., Kurz, N., Laatiaoui, M., Lahiri, S., Lommel, B., Maiti, M., Mistry, A. K., Mokry, C., Moody, K. J., Nagame, Y., Omtvedt, J. P., Papadakis, P., Pershina, V., Rudolph, D., Samiento, L. G., Sato, T. K., Schadel, M., Scharrer, P., Schausten, B., Shaughnessy, D. A., Steiner, J., Thorle-Pospiech, P., Toyoshima, A., Trautmann, N., Tsukada, K., Uusitalo, J., Voss, K. -O., Ward, A., Wegrzecki, M., Wiehl, N., Williams, E., and Yakusheva, V.

Subjects
superheavy elements, adsorption, ddc:540, General Chemistry, radiochemistry, nuclear chemistry, element 114, recoil separator
Abstract

Frontiers in Chemistry 10, 976635 (2022). doi:10.3389/fchem.2022.976635, Flerovium (Fl, element 114) is the heaviest element chemically studied so far. Todate, its interaction with gold was investigated in two gas-solid chromatographyexperiments, which reported two different types of interaction, however, eachbased on the level of a few registered atoms only. Whereas noble-gas-likeproperties were suggested from the first experiment, the second one pointed ata volatile-metal-like character. Here, we present further experimental data onadsorption studies of Fl on silicon oxide and gold surfaces, accounting for theinhomogeneous nature of the surface, as it was used in the experiment andanalyzed as part of the reported studies. We confirm that Fl is highly volatile andthe least reactive member of group 14. Our experimental observations suggestthat Fl exhibits lower reactivity towards Au than the volatile metal Hg, but higherreactivity than the noble gas Rn., Published by Frontiers Media, Lausanne

Published
2022

23. Spectroscopy along flerovium decay chains. III. Details on experiment, analysis, Cn282 , and spontaneous fission branches

Author

Såmark-Roth, A., primary, Cox, D. M., additional, Rudolph, D., additional, Sarmiento, L. G., additional, Albertsson, M., additional, Carlsson, B. G., additional, Egido, J. L., additional, Golubev, P., additional, Heery, J., additional, Yakushev, A., additional, Åberg, S., additional, Albers, H. M., additional, Block, M., additional, Brand, H., additional, Calverley, T., additional, Cantemir, R., additional, Clark, R. M., additional, Düllmann, Ch. E., additional, Eberth, J., additional, Fahlander, C., additional, Forsberg, U., additional, Gates, J. M., additional, Giacoppo, F., additional, Götz, M., additional, Götz, S., additional, Herzberg, R.-D., additional, Hrabar, Y., additional, Jäger, E., additional, Judson, D., additional, Khuyagbaatar, J., additional, Kindler, B., additional, Kojouharov, I., additional, Kratz, J. V., additional, Krier, J., additional, Kurz, N., additional, Lens, L., additional, Ljungberg, J., additional, Lommel, B., additional, Louko, J., additional, Meyer, C.-C., additional, Mistry, A., additional, Mokry, C., additional, Papadakis, P., additional, Parr, E., additional, Pore, J. L., additional, Ragnarsson, I., additional, Runke, J., additional, Schädel, M., additional, Schaffner, H., additional, Schausten, B., additional, Shaughnessy, D. A., additional, Thörle-Pospiech, P., additional, Trautmann, N., additional, and Uusitalo, J., additional

Published
2023
Full Text
View/download PDF

24. Spectroscopy along flerovium decay chains. II. Fine structure in odd- A Fl289

Author

Cox, D. M., primary, Såmark-Roth, A., additional, Rudolph, D., additional, Sarmiento, L. G., additional, Clark, R. M., additional, Egido, J. L., additional, Golubev, P., additional, Heery, J., additional, Yakushev, A., additional, Åberg, S., additional, Albers, H. M., additional, Albertsson, M., additional, Block, M., additional, Brand, H., additional, Calverley, T., additional, Cantemir, R., additional, Carlsson, B. G., additional, Düllmann, Ch. E., additional, Eberth, J., additional, Fahlander, C., additional, Forsberg, U., additional, Gates, J. M., additional, Giacoppo, F., additional, Götz, M., additional, Götz, S., additional, Herzberg, R.-D., additional, Hrabar, Y., additional, Jäger, E., additional, Judson, D., additional, Khuyagbaatar, J., additional, Kindler, B., additional, Kojouharov, I., additional, Kratz, J. V., additional, Krier, J., additional, Kurz, N., additional, Lens, L., additional, Ljungberg, J., additional, Lommel, B., additional, Louko, J., additional, Meyer, C.-C., additional, Mistry, A., additional, Mokry, C., additional, Papadakis, P., additional, Parr, E., additional, Pore, J. L., additional, Ragnarsson, I., additional, Runke, J., additional, Schädel, M., additional, Schaffner, H., additional, Schausten, B., additional, Shaughnessy, D. A., additional, Thörle-Pospiech, P., additional, Trautmann, N., additional, and Uusitalo, J., additional

Published
2023
Full Text
View/download PDF

25. Spectroscopy along flerovium decay chains. II. Fine structure in odd-A $^{289}Fl$

Author

Cox, D. M., Såmark-Roth, A., Rudolph, D., Sarmiento, L. G., Clark, R. M., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Carlsson, B. G., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, Michael, Götz, Stefan, Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, Lotte, Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, Edward, Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
Superheavy elements, Subatomic Physics, Island of stability, Mean field theory, ddc:530, Alpha decay, Nuclear spectroscopy
Abstract

Physical review / C 107(2), L021301 (2023). doi:10.1103/PhysRevC.107.L021301, Published by APS, Woodbury, NY

Published
2023
Full Text
View/download PDF

26. Spectroscopy along flerovium decay chains. III. Details on experiment, analysis, $^{282 }Cn$ , and spontaneous fission branches

Author

Såmark-Roth, A., Cox, D. M., Rudolph, D., Sarmiento, L. G., Albertsson, M., Carlsson, B. G., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, Michael, Götz, Stefan, Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, Lotte, Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, Edward, Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
Superheavy elements, Subatomic Physics, Spontaneous fission, E0 decay, Mean field theory, Alpha decay, ddc:530, Nuclear spectroscopy
Abstract

Physical review / C 107(2), 024301 (2023). doi:10.1103/PhysRevC.107.024301, Published by APS., Woodbury, NY

Published
2023
Full Text
View/download PDF

27. Spectroscopy along flerovium decay chains. III : Details on experiment, analysis, 282Cn, and spontaneous fission branches

Author

Såmark-Roth, A., Cox, D. M., Rudolph, D., Sarmiento, L. G., Albertsson, M., Carlsson, B. G., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, M., Götz, S., Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, L., Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
ydinfysiikka
Abstract

Flerovium isotopes (element Z=114) were produced in the fusion-evaporation reactions 48Ca+242,244Pu and studied with an upgraded TASISpec decay station placed in the focal plane of the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. Twenty-nine flerovium decay chains were identified by means of correlated implantation, α decay, and spontaneous fission events. Data analysis aspects and statistical assessments, primarily based on measured rates of various events, which laid the foundation for the comprehensive spectroscopic information on the flerovium decay chains, are presented in detail. Various decay scenarios of an excited state observed in 282Cn are examined in depth with the help of GEANT4 simulations and assessed by predictions of beyond mean-field calculations including triaxial shape degrees of freedom. Previous, revised, and newly derived fission probabilities of even-even superheavy nuclei are compared with various theoretical predictions. peerReviewed

Published
2023

28. Spectroscopy along flerovium decay chains. II : Fine structure in odd-A289Fl

Author

Cox, D. M., Såmark-Roth, A., Rudolph, D., Sarmiento, L. G., Clark, R. M., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Carlsson, B. G., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, M., Götz, S., Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, L., Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
ydinfysiikka
Abstract

Fifteen correlated α-decay chains starting from the odd-A superheavy nucleus 289Fl were observed following the fusion-evaporation reaction 48Ca+244Pu. The results call for at least two parallel α-decay sequences starting from at least two different states of 289Fl. This implies that close-lying levels in nuclei along these chains have quite different spin-parity assignments. Further, observed α-electron and α-photon coincidences, as well as the α-decay fine structure along the decay chains, suggest a change in the ground-state spin assignment between 285Cn and 281Ds. Our experimental results, on the excited level structure of the heaviest odd-N nuclei to date, provide a direct testing ground for theory. This is illustrated by comparison with new nuclear structure calculations based on the symmetry-conserving configuration mixing theory. peerReviewed

Published
2023

30. 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
Full Text
View/download PDF

31. The recoil transfer chamber—An interface to connect the physical preseparator TASCA with chemistry and counting setups

Author

Even, J., Ballof, J., Brüchle, W., Buda, R.A., Düllmann, Ch.E., Eberhardt, K., Gorshkov, A., Gromm, E., Hild, D., Jäger, E., Khuyagbaatar, J., Kratz, J.V., Krier, J., Liebe, D., Mendel, M., Nayak, D., Opel, K., Omtvedt, J.P., Reichert, P., Runke, J., Sabelnikov, A., Samadani, F., Schädel, M., Schausten, B., Scheid, N., Schimpf, E., Semchenkov, A., Thörle-Pospiech, P., Toyoshima, A., Türler, A., Vicente Vilas, V., Wiehl, N., Wunderlich, T., and Yakushev, A.

Published
2011
Full Text
View/download PDF

32. TASISpec—A highly efficient multi-coincidence spectrometer for nuclear structure investigations of the heaviest nuclei

Author

Andersson, L.-L., Rudolph, D., Golubev, P., Herzberg, R.-D., Hoischen, R., Merchán, E., Ackermann, D., Düllmann, Ch.E., Eberhardt, K., Even, J., Gerl, J., Heßberger, F.P., Jäger, E., Khuyagbaatar, J., Kojouharov, I., Kratz, J.V., Krier, J., Kurz, N., Prokopowicz, W., Schädel, M., Schaffner, H., Schausten, B., Schimpf, E., Semchenkov, A., Türler, A., Wollersheim, H.-J., Yakushev, A., Thörle-Pospiech, P., Hartmann, W., Hübner, A., Lommel, B., Kindler, B., and Steiner, J.

Published
2010
Full Text
View/download PDF

33. Search for Electron-Capture Delayed Fission in the New Isotope Md 244

Author

Khuyagbaatar J., Albers H. M., Block M., Brand H., Cantemir R. A., Di Nitto A., Dullmann C. E., Gotz M., Gotz S., Hessberger F. P., Jager E., Kindler B., Kratz J. V., Krier J., Kurz N., Lommel B., Lens L., Mistry A., Schausten B., Uusitalo J., Yakushev A., Khuyagbaatar, J., Albers, H. M., Block, M., Brand, H., Cantemir, R. A., Di Nitto, A., Dullmann, C. E., Gotz, M., Gotz, S., Hessberger, F. P., Jager, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Lommel, B., Lens, L., Mistry, A., Schausten, B., Uusitalo, J., and Yakushev, A.

Abstract

The electron-capture decay followed by a prompt fission process was searched for in the hitherto unknown most neutron-deficient Md isotope with mass number 244. Alpha decay with α-particle energies of 8.73-8.86 MeV and with a half-life of 0.30-0.09+0.19 s was assigned to Md244. No fission event with a similar half-life potentially originating from spontaneous fissioning of the short-lived electron-capture decay daughter Fm244 was observed, which results in an upper limit of 0.14 for the electron-capture branching of Md244. Two groups of fission events with half-lives of 0.9-0.3+0.6 ms and 5-2+3 ms were observed. The 0.9-0.3+0.6 ms activity was assigned to originate from the decay of Md245. The origin of eight fission events resulting in a half-life of 5-2+3 ms could not be unambiguously identified within the present data while the possible explanation has to invoke previously unseen physics cases.

Published
2020

34. First Study on Nihonium (Nh, Element 113) Chemistry at TASCA

Author

Yakushev, A., primary, Lens, L., additional, Düllmann, Ch. E., additional, Block, M., additional, Brand, H., additional, Calverley, T., additional, Dasgupta, M., additional, Di Nitto, A., additional, Götz, M., additional, Götz, S., additional, Haba, H., additional, Harkness-Brennan, L., additional, Herzberg, R-D., additional, Heßberger, F. P., additional, Hinde, D., additional, Hübner, A., additional, Jäger, E., additional, Judson, D., additional, Khuyagbaatar, J., additional, Kindler, B., additional, Komori, Y., additional, Konki, J., additional, Kratz, J.V., additional, Krier, J., additional, Kurz, N., additional, Laatiaoui, M., additional, Lommel, B., additional, Lorenz, Christian, additional, Maiti, M., additional, Mistry, A.K., additional, Mokry, Ch., additional, Nagame, Y., additional, Papadakis, P., additional, Såmark-Roth, A., additional, Rudolph, D., additional, Runke, J., additional, Sarmiento, L.G., additional, Sato, T.K., additional, Schädel, M., additional, Scharrer, P., additional, Schausten, B., additional, Steiner, J., additional, Thörle-Pospiech, P., additional, Toyoshima, A., additional, Trautmann, N., additional, Uusitalo, J., additional, Ward, A., additional, Wegrzecki, M., additional, and Yakusheva, V., additional

Published
2021
Full Text
View/download PDF

36. Isomeric states in Rf256

Author

Khuyagbaatar, J., primary, Brand, H., additional, Cantemir, R. A., additional, Düllmann, Ch. E., additional, Götz, M., additional, Götz, S., additional, Heßberger, F. P., additional, Jäger, E., additional, Kindler, B., additional, Krier, J., additional, Kurz, N., additional, Lommel, B., additional, Schausten, B., additional, and Yakushev, A., additional

Published
2021
Full Text
View/download PDF

37. Spectroscopy along Flerovium Decay Chains: Discovery of ^{280}Ds and an Excited State in ^{282}Cn

Author

Såmark-Roth, A., Cox, D. M., Rudolph, D., Sarmiento, L. G., Carlsson, B. G., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Åberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Düllmann, Ch. E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Götz, M., Götz, S., Herzberg, R.-D., Hrabar, Y., Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kratz, J. V., Krier, J., Kurz, N., Lens, L., Ljungberg, J., Lommel, B., Louko, J., Meyer, C.-C., Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, I., Runke, J., Schädel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Subjects
General Physics, Engineering, Superheavy elements, Subatomic Physics, Island of stability, Physical Sciences, Mean field theory, Alpha decay, ddc:530, Mathematical Sciences, Nuclear spectroscopy
Abstract

Physical review letters 126(3), 032503 (2021). doi:10.1103/PhysRevLett.126.032503, Published by APS, College Park, Md.

Published
2021

38. Spectroscopy along flerovium decay chains: Discovery of 280Ds and an excited state in 282Cn

Author

Såmark-Roth, Anton, Cox, Daniel, Rudolph, Dirk, Sarmiento Pico, Luis, Carlsson, Gillis, Egido, J. L., Golubev, Pavel, Heery, J.A.M., Yakushev, Alexander, Åberg, Sven, Albers, Helena M., Albertsson, Martin, Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, Roderick M., Düllmann, Ch. E., Eberth, J, Fahlander, Claes, Forsberg, Ulrika, Gates, J. M., Giacoppo, F., Götz, Michael, Götz, Stefan, Herzberg, R.-D., Hrabar, Yuliia, Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, Birgit, Kojouharov, I., Kratz, Jens-Volker, Krier, J., Kurz, N., Lens, L., Ljungberg, Jimmy, Lommel, Bettina, Louko, J., Meyer, Carl-Christian, Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, Ingemar, Runke, J., Schädel, Matthias, Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., Uusitalo, J., Såmark-Roth, Anton, Cox, Daniel, Rudolph, Dirk, Sarmiento Pico, Luis, Carlsson, Gillis, Egido, J. L., Golubev, Pavel, Heery, J.A.M., Yakushev, Alexander, Åberg, Sven, Albers, Helena M., Albertsson, Martin, Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, Roderick M., Düllmann, Ch. E., Eberth, J, Fahlander, Claes, Forsberg, Ulrika, Gates, J. M., Giacoppo, F., Götz, Michael, Götz, Stefan, Herzberg, R.-D., Hrabar, Yuliia, Jäger, E., Judson, D., Khuyagbaatar, J., Kindler, Birgit, Kojouharov, I., Kratz, Jens-Volker, Krier, J., Kurz, N., Lens, L., Ljungberg, Jimmy, Lommel, Bettina, Louko, J., Meyer, Carl-Christian, Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, Ingemar, Runke, J., Schädel, Matthias, Schaffner, H., Schausten, B., Shaughnessy, D. A., Thörle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Abstract

A nuclear spectroscopy experiment was conducted to study α-decay chains stemming from isotopes of flerovium (element Z=114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions 48Ca+242Pu and 48Ca+244Pu provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to 286Fl and 288Fl, respectively. A prompt coincidence between a 9.60(1)-MeV α-particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely 282Cn. Spectroscopy of 288Fl decay chains fixed Qα=10.06(1) MeV. In one case, a Qα=9.46(1)-MeV decay from 284Cn into 280Ds was observed, with 280Ds fissioning after only 518 μs. The impact of these findings, aggregated with existing data on decay chains of 286,288Fl, on the size of an anticipated shell gap at proton number Z=114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

Published
2021

39. Spectroscopy along Flerovium Decay Chains: Discovery of (280)Ds and an Excited State in (282)Cn

Author

Samark-Roth, A., Cox, D. M., Rudolph, D., Sarmiento, L. G., Carlsson, B. G., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Aberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Duellmann, Ch E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Goetz, M., Goetz, S., Herzberg, R-D, Hrabar, Y., Jaeger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I, Kratz, J., V, Krier, J., Kurz, N., Lens, L., Ljungberg, J., Lommel, B., Louko, J., Meyer, C-C, Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, I, Runke, J., Schaedel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thoerle-Pospiech, P., Trautmann, N., Uusitalo, J., Samark-Roth, A., Cox, D. M., Rudolph, D., Sarmiento, L. G., Carlsson, B. G., Egido, J. L., Golubev, P., Heery, J., Yakushev, A., Aberg, S., Albers, H. M., Albertsson, M., Block, M., Brand, H., Calverley, T., Cantemir, R., Clark, R. M., Duellmann, Ch E., Eberth, J., Fahlander, C., Forsberg, U., Gates, J. M., Giacoppo, F., Goetz, M., Goetz, S., Herzberg, R-D, Hrabar, Y., Jaeger, E., Judson, D., Khuyagbaatar, J., Kindler, B., Kojouharov, I, Kratz, J., V, Krier, J., Kurz, N., Lens, L., Ljungberg, J., Lommel, B., Louko, J., Meyer, C-C, Mistry, A., Mokry, C., Papadakis, P., Parr, E., Pore, J. L., Ragnarsson, I, Runke, J., Schaedel, M., Schaffner, H., Schausten, B., Shaughnessy, D. A., Thoerle-Pospiech, P., Trautmann, N., and Uusitalo, J.

Abstract

A nuclear spectroscopy experiment was conducted to study a-decay chains stemming from isotopes of flerovium (clement Z = 114). An upgraded TASISpec decay station was placed behind the gas-filled separator TASCA at the GSI Helmholtzzentrum fiir Schwerionenforschung in Darmstadt, Germany. The fusion-evaporation reactions 48(Ca) + 242(pu) and 48(Ca) + 244(Pu) provided a total of 32 flerovium-candidate decay chains, of which two and eleven were firmly assigned to H-286 and (288)Fl, respectively. A prompt coincidence between a 9.60(1)-MeV alpha particle event and a 0.36(1)-MeV conversion electron marked the first observation of an excited state in an even-even isotope of the heaviest man-made elements, namely 282 Cn. Spectroscopy of 288 F1 decay chains fixed Q(alpha) = 10.06(1) MeV. In one case, a Q(alpha) = 9.46(1)-MeV decay from 284 01 into 280 Ds was observed, with (280)Ds fissioning after only 518 its. The impact of these findings, aggregated with existing data on decay chains of (286,288)Fl, on the size of an anticipated shell gap at proton number Z = 114 is discussed in light of predictions from two beyond-mean-field calculations, which take into account triaxial deformation.

Published
2021

41. 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

42. Spectroscopic Tools Applied to Flerovium Decay Chains

Author

Cox, D. M., Såmark-Roth, A., Rudolph, D., Sarmiento, L.G., Fahlander, C., Forsberg, U., Golubev, P., Heery, J.A.M., Yakushev, A., Albers, H. M., Block, M., Brand, H., Clark, R.M., Düllmann, Ch.E., Eberth, J., Gates, J.M., Giacoppo, F., Götz, M., Götz, S., Herzberg, R.-D., Jäger, E., Kindler, B., Khuyagbaatar, J., Kojouharov, I., Kratz, J.V., Krier, J., Kurz, N., Lens, L., Lommel, B., Mistry, A., Meyer, C.-C., Mokry, C., Papadakis, P., Pore, J.L., Runke, J., Thörle-Pospiech, P., Trautmann, N., Schaffner, H, Schausten, B., Uusitalo, J., Cox, D. M., Såmark-Roth, A., Rudolph, D., Sarmiento, L.G., Fahlander, C., Forsberg, U., Golubev, P., Heery, J.A.M., Yakushev, A., Albers, H. M., Block, M., Brand, H., Clark, R.M., Düllmann, Ch.E., Eberth, J., Gates, J.M., Giacoppo, F., Götz, M., Götz, S., Herzberg, R.-D., Jäger, E., Kindler, B., Khuyagbaatar, J., Kojouharov, I., Kratz, J.V., Krier, J., Kurz, N., Lens, L., Lommel, B., Mistry, A., Meyer, C.-C., Mokry, C., Papadakis, P., Pore, J.L., Runke, J., Thörle-Pospiech, P., Trautmann, N., Schaffner, H, Schausten, B., and Uusitalo, J.

Abstract

An upgraded TASISpec setup, with the addition of a veto DSSD and the new Compex detector-germanium array, has been employed with the gas-filled recoil separator TASCA at the GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, to study flerovium (element 114) decay chains. The detector upgrades along with development of new analytical techniques have improved the sensitivity of the TASISpec setup for measuring α-photon coincidences. These improvements have been assessed with test reactions. The reaction 48Ca+206,207Pb was used for verification of experimental parameters such as transmission to implantation DSSD and target-segment to α-decay correlations. The reaction 48Ca+ natHf was used to produce several short-lived nuclei with multiple-α decay chains to investigate pile-up event deconvolution.

Published
2020

43. 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

44. Spectroscopy along Flerovium Decay Chains: Discovery ofDs280and an Excited State inCn282

Author

Såmark-Roth, A., primary, Cox, D. M., additional, Rudolph, D., additional, Sarmiento, L. G., additional, Carlsson, B. G., additional, Egido, J. L., additional, Golubev, P., additional, Heery, J., additional, Yakushev, A., additional, Åberg, S., additional, Albers, H. M., additional, Albertsson, M., additional, Block, M., additional, Brand, H., additional, Calverley, T., additional, Cantemir, R., additional, Clark, R. M., additional, Düllmann, Ch. E., additional, Eberth, J., additional, Fahlander, C., additional, Forsberg, U., additional, Gates, J. M., additional, Giacoppo, F., additional, Götz, M., additional, Götz, S., additional, Herzberg, R.-D., additional, Hrabar, Y., additional, Jäger, E., additional, Judson, D., additional, Khuyagbaatar, J., additional, Kindler, B., additional, Kojouharov, I., additional, Kratz, J. V., additional, Krier, J., additional, Kurz, N., additional, Lens, L., additional, Ljungberg, J., additional, Lommel, B., additional, Louko, J., additional, Meyer, C.-C., additional, Mistry, A., additional, Mokry, C., additional, Papadakis, P., additional, Parr, E., additional, Pore, J. L., additional, Ragnarsson, I., additional, Runke, J., additional, Schädel, M., additional, Schaffner, H., additional, Schausten, B., additional, Shaughnessy, D. A., additional, Thörle-Pospiech, P., additional, Trautmann, N., additional, and Uusitalo, J., additional

Published
2021
Full Text
View/download PDF

45. 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
Full Text
View/download PDF

46. On the decay properties of 269Hs and indications for the new nuclide 270Hs

Author

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

Published
2003
Full Text
View/download PDF

47. 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
Full Text
View/download PDF

48. 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
Full Text
View/download PDF

50. Search for Electron-Capture Delayed Fission in the New Isotope Md244

Author

Khuyagbaatar, J., primary, Albers, H. M., additional, Block, M., additional, Brand, H., additional, Cantemir, R. A., additional, Di Nitto, A., additional, Düllmann, Ch. E., additional, Götz, M., additional, Götz, S., additional, Heßberger, F. P., additional, Jäger, E., additional, Kindler, B., additional, Kratz, J. V., additional, Krier, J., additional, Kurz, N., additional, Lommel, B., additional, Lens, L., additional, Mistry, A., additional, Schausten, B., additional, Uusitalo, J., additional, and Yakushev, A., additional

Published
2020
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results