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368 results on '"Kindler, B."'

1. A compact start time counter using plastic scintillators readout with MPPC arrays for the WASA-FRS HypHI experiment

Author

Liu, E., Drozd, V., Ekawa, H., Escrig, S., Gao, Y., He, Y., Kasagi, A., Nakagawa, M., Ong, H., Rappold, C., Sekiya, R., Saito, T.R., Tang, X., Tanaka, Y.K., Wang, H., Yanai, A., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K.-H., Benlliure, J., Brencic, Z., Dickel, T., Dubey, S., Feijoo-Fontán, M., Fujioka, H., Geissel, H., Goldenbaum, F., González, A. Graña, Haettner, E., Harakeh, M.N., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Iwasaki, M., Kalantar-Nayestanaki, N., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Kindler, B., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Lommel, B., Minami, S., Morrissey, D.J., Moskal, P., Mukha, I., Muneem, A., Nakazawa, K., Nociforo, C., Pietri, S., Pochodzalla, J., Purushothaman, S., Rocco, E., Rodríguez-Sánchez, J.L., Roy, P., Ruber, R., Schadmand, S., Scheidenberger, C., Schwarz, P., Serdyuk, V., Skurzok, M., Streicher, B., Suzuki, K., Szczepanczyk, B., Tortorelli, N., Vencelj, M., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yoshida, J., and Zhao, J.

Published
2024
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3. The WASA-FRS project at GSI and its perspective

Author

Saito, T.R., Achenbach, P., Alfaki, H. Alibrahim, Amjad, F., Armstrong, M., Behr, K.-H., Benlliure, J., Brencic, Z., Dickel, T., Drozd, V., Dubey, S., Ekawa, H., Escrig, S., Feijoo-Fontán, M., Fujioka, H., Gao, Y., Geissel, H., Goldenbaum, F., González, A. Graña, Haettner, E., Harakeh, M.N., He, Y., Heggen, H., Hornung, C., Hubbard, N., Itahashi, K., Iwasaki, M., Kalantar-Nayestanaki, N., Kasagi, A., Kavatsyuk, M., Kazantseva, E., Khreptak, A., Kindler, B., Knoebel, R., Kollmus, H., Kostyleva, D., Kraft-Bermuth, S., Kurz, N., Liu, E., Lommel, B., Metag, V., Minami, S., Morrissey, D.J., Moskal, P., Mukha, I., Muneem, A., Nakagawa, M., Nakazawa, K., Nociforo, C., Ong, H.J., Pietri, S., Pochodzalla, J., Purushothaman, S., Rappold, C., Rocco, E., Rodríguez-Sánchez, J.L., Roy, P., Ruber, R., Schadmand, S., Scheidenberger, C., Schwarz, P., Sekiya, R., Serdyuk, V., Skurzok, M., Streicher, B., Suzuki, K., Szczepanczyk, B., Tanaka, Y.K., Tang, X., Tortorelli, N., Vencelj, M., Wang, H., Weber, T., Weick, H., Will, M., Wimmer, K., Yamamoto, A., Yanai, A., Yoshida, J., and Zhao, J.

Published
2023
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5. Rapid extraction of short-lived isotopes from a buffer gas cell for use in gas-phase chemistry experiments, Part II: On-line studies with short-lived accelerator-produced radionuclides

Author

Götz, S., Raeder, S., Block, M., Düllmann, Ch.E., Folden, C.M., III, Glennon, K.J., Götz, M., Hübner, A., Jäger, E., Kaleja, O., Khuyagbaatar, J., Kindler, B., Krier, J., Lens, L., Lommel, B., Mistry, A.K., Mokry, Ch., Runke, J., Såmark-Roth, A., Tereshatov, E.E., Thörle-Pospiech, P., Volia, M.F., Yakushev, A., and Yakusheva, V.

Published
2021
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6. Study of light hypernuclei in Europe: The hypertriton and nnΛ puzzles

Author

Rappold C., Achenbach P., Alibrahim Alfaki H., Amjad F., Armstrong M., Behr K.-H., Benlliure J., Brencic Z., Dickel T., Drozd V., Dubey S., Ekawa H., Escrig S., Feijoo-Fontan M., Fujioka H., Gao Y., Geissel H., Goldenbaum F., Graña Gonzalez A., Haettner E., Harakeh M. N., He Y., Heggen H., Hornung C., Hubbard N., Itahashi K., Iwasaki M., Kalantar-Nayestanaki N., Kasagi A., Kavatsyuk M., Kazantseva E., Khreptak A., Kindler B., Knoebel R., Kollmus H., Kostyleva D., Kraft-Bermuth S., Kurz N., Liu E., Lommel B., Metag V., Minami S., Morrissey D.J., Moskal P., Mukha I., Muneem A., Nakagawa M., Nakazawa K., Nociforo C., Ong H.J., Pietri S., Pochodzalla J., Purushothaman S., Rocco E., Rodríguez-Sánchez J.L., Roy P., Ruber R., Saito T.R., Schadmand S., Scheidenberger C., Schwarz P., Sekiya R., Serdyuk V., Skurzok M., Streicher B., Suzuki K., Szczepanczyk B., Tanaka Y. K., Tang X., Tortorelli N., Vencelj M., Wang H., Weber T., Weick H., Will M., Wimmer K., Yamamoto A., Yanai A., Yoshida J., and Zhao J.

Subjects
Physics, QC1-999
Abstract

The current understanding of light hypernuclei, which are sub-atomic nuclei with strangeness, is being challenged and studied in detail by several European research groups and collaborations. In recent years, studies of hypernuclei using high-energy heavy ion beams have reported unexpected results on the three-body hypernuclear state 3ΛH, named the hypertriton. For some time, reports of a shorter lifetime and larger binding energy than what was previously accepted have created a puzzling situation for its theoretical description; this is known as the "hypertriton puzzle". With the inclusion of the most recent experimental measurements, the current status of the hypertriton puzzle is evolving. Additionally, the possible neutral bound state of a Λ hyperon with two neutrons, nnΛ, has raised questions about our understanding of the formation of light hypernuclei either in bound or resonance states. These results have initiated several ongoing experimental programs all over the world to study these three-body hypernuclear states precisely. We are studying these light hypernuclear states by employing heavy ion beams at 2AGeV on a fixed carbon target with the WASA detector system and the Fragment Separator (FRS) at GSI. The WASA-FRS experimental campaign was performed during the first quarter of 2022, and this paper presents a short overview of the campaign and how it seeks to tackle the hypertriton and nnΛ puzzles. Data analysis is ongoing, and several preliminary results will be reported.

Published
2023
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8. First investigation on the isomeric ratio in multinucleon transfer reactions: Entrance channel effects on the spin distribution

Author

Kumar, D., Dickel, T., Zadvornaya, A., Beliuskina, O., Kankainen, A., Constantin, P., Purushothaman, S., Spataru, A., Stryjczyk, M., Al Ayoubi, L., Brunet, M., Canete, L., Delafosse, C., de Groote, R.P., de Roubin, A., Eronen, T., Ge, Z., Gins, W., Hornung, C., Hukkanen, M., Illana, A., Jokinen, A., Kahl, D., Kindler, B., Lommel, B., Mardor, I., Moore, I.D., Nesterenko, D.A., Nichita, D., Nikas, S., Ortiz-Cortes, A., Penttilä, H., Podolyák, Zs., Pohjalainen, I., Raggio, A., Reponen, M., Rinta-Antila, S., Romero, J., Saren, J., Vilen, M., Virtanen, V., Weaver, A., and Winfield, J.

Published
2024
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9. First observation of a shape isomer and a low-lying strongly-coupled prolate band in neutron-deficient semi-magic Pb

Author

Zhang, W.Q., Andreyev, A.N., Liu, Z., Seweryniak, D., Huang, H., Li, Z.H., Li, J.G., Guo, C.Y., Doherty, D.T., Barzakh, A.E., Van Duppen, P., Cubiss, J.G., Andel, B., Antalic, S., Block, M., Bronis, A., Carpenter, M.P., Copp, P., Ding, B., Favier, Z., Giacoppo, F., Huang, T.H., Yu, X.H., Kindler, B., Kondev, F.G., Lauritsen, T., Li, G.S., Lommel, B., Lu, H.Y., Al Monthery, M., Mošať, P., Niu, Y.F., Raison, C., Reviol, W., Savard, G., Stolze, S., Wilson, G.L., Wu, H.Y., Wang, Z.H., Xu, F.R., Zeng, Q.B., and Zhou, X.H.

Abstract

Prompt and delayed γ-ray spectroscopy of the neutron-deficient, semi-magic isotope $^{187}$Pb has been performed using the recoil-decay and isomer-decay tagging techniques at the Argonne Gas-Filled Analyzer. A new 5.15(15)-μs isomeric state at only 308 keV above the spherical 3/2$^{−}$ ground state is identified and classified as a shape isomer. A strongly-coupled band is observed on top of the isomer, which is nearly identical to the one built on the prolate 7/2$^{−}$[514] Nilsson state in the isotone $^{185}$Hg. Based on this similarity and on the result of the potential-energy surface calculations, the new isomer in $^{187}$Pb is proposed to originate from the same configuration. The retarded character of the 308-keV (7/2$^{−}$)→3/2gs− transition with a deduced B(E2)=5.6(2)×10−4 W.u. can be well explained by the significant difference between the prolate parent and spherical daughter configurations, leading to the shape isomerism. The excitation energy of the isomer is surprisingly low, being roughly half of the excitation energies of the known 0$^{+}$ intruder bandheads in the neighboring $^{186,188}$Pb isotopes. The combined results of the present work and the previous α-decay and laser spectroscopy studies present evidence for triple shape coexistence at low energy in the negative-parity configurations of $^{187}$Pb, which is well reproduced by the potential-energy surface calculations.

Published
2023

10. Accurate simultaneous lead stopping power and charge-state measurements in gases and solids: Benchmark data for basic atomic theory and nuclear applications

Author

Ishikawa, S., Geissel, H., Purushothaman, S., Weick, H., Haettner, E., Iwasa, N., Scheidenberger, C., Sørensen, A.H., Tanaka, Y.K., Abel, T., Äystö, J., Bagchi, S., Dickel, T., Drozd, V., Franczak, B., Greiner, F., Harakeh, M.N., Kalantar-Nayestanaki, N., Kindler, B., Knöbel, R., Kostyleva, D., Kraft-Bermuth, S., Kuzminchuk, N., Lamour, E., Lommel, B., Mukha, I., Patyk, Z., Pietri, S., Schaumann, G., and Zhao, J.

Published
2023
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11. Sequential fission and the influence of Pb closed shells on the dynamics of superheavy element synthesis reactions

Author

Jeung, D.Y., Hinde, D.J., Dasgupta, M., Simenel, C., Simpson, E.C., Cook, K.J., Albers, H.M., Buete, J., Carter, I.P., Düllmann, Ch.E., Khuyagbaatar, J., Kindler, B., Lobanov, N., Lommel, B., Mokry, C., Prasad, E., Runke, J., Sengupta, C., Smith, J.F., Thörle-Pospiech, P., Trautmann, N., Vo-Phuoc, K., Walshe, J., Williams, E., and Yakushev, A.

Abstract

Measured binary quasifission mass spectra in reactions with actinide nuclides show a large peak in yield near the doubly-magic $^{208}$Pb. This has generally been attributed to the enhanced binding energy of $^{208}$Pb causing a valley in the potential energy surface, attracting quasifission trajectories. To investigate this interpretation, binary quasifission mass spectra and cross-sections have been measured at near-barrier energies for reactions of $^{50}$Ti with actinide nuclides from $^{238}$U to $^{249}$Cf. Cross-sections have also been deduced for sequential fission (a projectile-like nucleus and two fragments from fission of the complementary target-like nucleus). Binary cross-sections fall from ∼70% of calculated capture cross-sections for $^{238}$U to only ∼40% for $^{249}$Cf, with a compensating increase in sequential fission cross-sections. The data are consistent with the $^{208}$Pb peak originating largely from sequential fission of heavier fragments produced in more mass-asymmetric primary quasifission events. These are increasingly suppressed as the heavy quasifission fragment mass increases above $^{208}$Pb. The important role of sequential fission calls for re-interpretation of quasifission characteristics and dynamics in superheavy element synthesis reactions.

Published
2023

12. 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
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13. 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
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14. 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
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15. 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

16. 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

19. Sequential fission and the influence of 208Pb closed shells on the dynamics of superheavy element synthesis reactions

Author

Jeung, D.Y., Hinde, D.J., Dasgupta, M., Simenel, C., Simpson, E.C., Cook, K.J., Albers, H.M., Buete, J., Carter, I.P., Düllmann, Ch.E., Khuyagbaatar, J., Kindler, B., Lobanov, N., Lommel, B., Mokry, C., Prasad, E., Runke, J., Sengupta, C., Smith, J.F., Thörle-Pospiech, P., Trautmann, N., Vo-Phuoc, K., Walshe, J., Williams, E., and Yakushev, A.

Published
2023
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20. First observation of the decay of the 13/2+ isomer in 183Hg and B(M2) systematics of neutron transitions across the nuclear chart

Author

Huang, H., Zhang, W.Q., Andreyev, A.N., Liu, Z., Seweryniak, D., Li, Z.H., Guo, C.Y., Barzakh, A.E., Duppen, P. Van, Andel, B., Antalic, S., Block, M., Bronis, A., Carpenter, M.P., Copp, P., Cubiss, J.G., Ding, B., Doherty, D.T., Favier, Z., Giacoppo, F., Huang, T.H., Kindler, B., Kondev, F.G., Lauritsen, T., Li, J.G., Li, G.S., Lommel, B., Lu, H.Y., Monthery, M. Al, Mošať, P., Niu, Y.F., Raison, C., Reviol, W., Savard, G., Stolze, S., Wilson, G.L., Wu, H.Y., Wang, Z.H., Xu, F.R., Zeng, Q.B., Yu, X.H., Zeng, F.F., and Zhou, X.H.

Subjects
Nuclear and High Energy Physics, Science & Technology, SPECTROSCOPY, IDENTIFICATION, Isomeric decay, Physics, ALPHA-DECAY, Astronomy & Astrophysics, Physics, Particles & Fields, Physics, Nuclear, STATES, SHAPE COEXISTENCE, MOMENTS, Physical Sciences, Shape isomer, B(M2), ddc:530, BETA-DECAY, BANDS, RADII, ODD-A
Abstract

Physics letters / B 833, 137345 (2022). doi:10.1016/j.physletb.2022.137345, Published by North-Holland Publ., Amsterdam

Published
2022

21. Identification of excited states in 188Bi and 188Po

Author

Zhang, W. Q., Andreyev, A. N., Liu, Z., Seweryniak, D., Huang, H., Li, Z. H., Li, J. G., Guo, C. Y., Barzakh, A. E., Van Duppen, P., Al Monthery, M., Andel, B., Antalic, S., Block, M., Bronis, A., Carpenter, M. P., Copp, P., Cubiss, J. G., Ding, B., Doherty, D. T., Favier, Z., Giacoppo, F., Huang, T. H., Kindler, B., Kondev, F. G., Lauritsen, T., Li, G. S., Lommel, B., Lu, H. Y., Moifmmode selse šaifmmode telse ť, P., Niu, Y. F., Raison, C., Reviol, W., Savard, G., Stolze, S., Wilson, G. L., Wu, H. Y., Wang, Z. H., Xu, F. R., Yu, X. H., Zeng, Q. B., and Zhou, X. H.

Published
2022

24. Synthesis and detection of a seaborgium carbonyl complex

Author

Even, J., Yakushev, A., Düllmann, Ch. E., Haba, H., Asai, M., Sato, T. K., Brand, H., Di Nitto, A., Eichler, R., Fan, F. L., Hartmann, W., Huang, M., Jäger, E., Kaji, D., Kanaya, J., Kaneya, Y., Khuyagbaatar, J., Kindler, B., Kratz, J. V., Krier, J., Kudou, Y., Kurz, N., Lommel, B., Miyashita, S., Morimoto, K., Morita, K., Murakami, M., Nagame, Y., Nitsche, H., Ooe, K., Qin, Z., Schädel, M., Steiner, J., Sumita, T., Takeyama, M., Tanaka, K., Toyoshima, A., Tsukada, K., Türler, A., Usoltsev, I., Wakabayashi, Y., Wang, Y., Wiehl, N., and Yamaki, S.

Published
2014

25. First observation of the decay of the 13/2 Isomer in Hg and ( 2) Systematics of Neutron Transitions Across the Nuclear Chart

Author

Huang, H., Zhang, W.Q., Andreyev, A.N., Liu, Z., Seweryniak, D., Li, Z.H., Guo, C.Y., Barzakh, A.E., Van Duppen, P., Andel, B., Antalic, S., Block, M., Bronis, A., Carpenter, M.P., Copp, P., Cubiss, J.G., Ding, B., Doherty, D.T., Favier, Z., Giacoppo, F., Huang, T.H., Kindler, B., Kondev, F.G., Lauritsen, T., Li, J.G., Li, G.S., Lommel, B., Lu, H.Y., Al Monthery, M., Mošať, P., Niu, Y.F., Raison, C., Reviol, W., Savard, G., Stolze, S., Wilson, G.L., Wu, H.Y., Wang, Z.H., Xu, F.R., Zeng, Q.B., Yu, X.H., Zeng, F.F., and Zhou, X.H.

Abstract

The decay of the 13/2$^{+}$ isomeric state in $^{183}$Hg was observed for the first time following the α decay of the 13/2$^{+}$ isomer in $^{187}$Pb produced in the $^{142}$Nd($^{50}$Cr, 2p3n) reaction. Using α−γ delayed coincidence measurements, the half-life of this isomer was measured to be 290(30) μs. This isomer is proposed to deexcite by an unobserved low-energy M2 transition to the known 9/2$^{−}$ member of a strongly prolate-deformed 7/2$^{−}$[514] band, followed by a 105-keV M1 transition to the bandhead. A lower limit of B(M2) ≥ 0.018 W.u. was deduced for the unobserved transition. The presumed retardation is proposed to be due to the notable shape change between the initial, nearly spherical, and the final, strongly deformed, states. A similar scenario is also considered for the 13/2$^{+}$ isomer in $^{181}$Hg, suggesting both are cases of shape isomers. The B(M2) systematics of neutron transitions across the nuclear chart is discussed.

Published
2022

27. Review of even element super-heavy nuclei and search for element 120

Author

Hofmann, S., Heinz, S., Mann, R., Maurer, J., Münzenberg, G., Antalic, S., Barth, W., Burkhard, H. G., Dahl, L., Eberhardt, K., Grzywacz, R., Hamilton, J. H., Henderson, R. A., Kenneally, J. M., Kindler, B., Kojouharov, I., Lang, R., Lommel, B., Miernik, K., Miller, D., Moody, K. J., Morita, K., Nishio, K., Popeko, A. G., Roberto, J. B., Runke, J., Rykaczewski, K. P., Saro, S., Scheidenberger, C., Schött, H. J., Shaughnessy, D. A., Stoyer, M. A., Thörle-Pospiech, P., Tinschert, K., Trautmann, N., Uusitalo, J., and Yeremin, A. V.

Published
2016
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28. Remarks on the fission barriers of super-heavy nuclei

Author

Hofmann, S., Heinz, S., Mann, R., Maurer, J., Münzenberg, G., Antalic, S., Barth, W., Dahl, L., Eberhardt, K., Grzywacz, R., Hamilton, J. H., Henderson, R. A., Kenneally, J. M., Kindler, B., Kojouharov, I., Lang, R., Lommel, B., Miernik, K., Miller, D., Moody, K. J., Morita, K., Nishio, K., Popeko, A. G., Roberto, J. B., Runke, J., Rykaczewski, K. P., Scheidenberger, C., Shaughnessy, D. A., Stoyer, M. A., Thörle-Pospiech, P., Tinschert, K., Trautmann, N., Uusitalo, J., and Yeremin, A. V.

Published
2016
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30. First observation of a shape isomer and a low-lying strongly-coupled prolate band in neutron-deficient semi-magic 187Pb

Author

Zhang, W.Q., Andreyev, A.N., Liu, Z., Seweryniak, D., Huang, H., Li, Z.H., Li, J.G., Guo, C.Y., Doherty, D.T., Barzakh, A.E., Van Duppen, P., Cubiss, J.G., Andel, B., Antalic, S., Block, M., Bronis, A., Carpenter, M.P., Copp, P., Ding, B., Favier, Z., Giacoppo, F., Huang, T.H., Yu, X.H., Kindler, B., Kondev, F.G., Lauritsen, T., Li, G.S., Lommel, B., Lu, H.Y., Al Monthery, M., Mošať, P., Niu, Y.F., Raison, C., Reviol, W., Savard, G., Stolze, S., Wilson, G.L., Wu, H.Y., Wang, Z.H., Xu, F.R., Zeng, Q.B., and Zhou, X.H.

Published
2022
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31. On the adsorption and reactivity of element 114, flerovium

Author

Yakushev, A., Lens, L., Düllmann, Ch. E., Khuyagbaatar, J., Jäger, E., Krier, J., Runke, J., Albers, H. M., Asai, M., Block, M., Despotopulos, J., Di Nitto, A., Eberhardt, K., Forsberg, U., Golubev, P., Götz, M., Götz, S., Haba, H., Harkness-Brennan, L., Herzberg, R.-D., Heßberger, F. P., Hinde, D., Hübner, 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, 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., and Yakusheva, V.

Subjects
superheavy elements, atomit, atomifysiikka, adsorption, radiokemia, alkuaineet, radiochemistry, nuclear chemistry, adsorptio, recoil separators, element 114, kemialliset ominaisuudet
Abstract

Flerovium (Fl, element 114) is the heaviest element chemically studied so far. To date, its interaction with gold was investigated in two gas-solid chromatography experiments, which reported two different types of interaction, however, each based on the level of a few registered atoms only. Whereas noble-gas-like properties were suggested from the first experiment, the second one pointed at a volatile-metal-like character. Here, we present further experimental data on adsorption studies of Fl on silicon oxide and gold surfaces, accounting for the inhomogeneous nature of the surface, as it was used in the experiment and analyzed as part of the reported studies. We confirm that Fl is highly volatile and the least reactive member of group 14. Our experimental observations suggest that Fl exhibits lower reactivity towards Au than the volatile metal Hg, but higher reactivity than the noble gas Rn. peerReviewed

Published
2022

32. Identification of excited states in $^{188}\mathrm{Bi}$ and $^{188}\mathrm{Po}$

Author

Zhang, W.Q., Andreyev, A.N., Liu, Z., Seweryniak, D., Huang, H., Li, Z.H., Li, J.G., Guo, C.Y., Barzakh, A.E., van Duppen, P., Al Monthery, M., Andel, B., Antalic, S., Block, M., Bronis, A., Carpenter, M.P., Copp, P., Cubiss, J.G., Ding, B., Doherty, D.T., Favier, Z., Giacoppo, F., Huang, T.H., Kindler, B., Kondev, F.G., Lauritsen, T., Li, G.S., Lommel, B., Lu, H.Y., Mošať, P., Niu, Y.F., Raison, C., Reviol, W., Savard, G., Stolze, S., Wilson, G.L., Wu, H.Y., Wang, Z.H., Xu, F.R., Yu, X.H., Zeng, Q.B., Zhou, X.H., Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
Abstract

International audience; The neutron-deficient Bi188 and Po188 isotopes have been studied by γ-ray spectroscopy using the recoil-decay tagging technique with the Argonne Gas-Filled Analyzer. A new 0.25(5)-μs isomeric state and a prompt cascade formed by 319-, 366-, and 462-keV γ rays have been established on top of the (10−) α-decaying isomer in Bi188. The first excited (2+) state in Po188 was identified, its excitation energy of 242(2) keV continues the nearly constant trend for the first 2+ states in Po190,192,194. The state is most likely a member of a prolate rotational band built on the ground state, albeit mixing with other coexisting configurations cannot be excluded. The new results obtained in the present work provide new information to shape coexistence in bismuth and polonium isotopes near the neutron midshell at N=104. In this mass region, a reduction in the prompt γ-ray yield obtained with recoil decay tagging was observed for a few nuclides, and the possible reasons are presented.

Published
2022

33. Decay studies of new isomeric states in 255No

Author

Bronis, A., Heßberger, F. P., Antalic, S., Andel, B., Ackermann, D., Heinz, S., Hofmann, S., Khuyagbaatar, J., Kindler, B., Kojouharov, I., Kuusiniemi, P., Leino, M., Lommel, B., Mann, R., Nishio, K., Popeko, A. G., Streicher, B., Sulignano, B., Uusitalo, J., Venhart, M., and Yeremin, A. V.

Subjects
ydinfysiikka
Abstract

The decay of excited states in 255No was investigated by applying the evaporation-residue–conversion-electron correlation technique. Two new isomeric states were observed in 255No together with the previously known one. Excitation energies of the isomeric states were estimated based on the energies of conversion electrons and γ rays from correlation chains. These results were in accord with theoretical calculations based on the mean-field models. A tentative decay scheme of isomeric states in 255No is proposed, and their Nilsson configurations are discussed. The energy decrease of the 11/2−[725] Nilsson level for heavy N=153 isotones as a function of increasing proton number is confirmed. peerReviewed

Published
2022

35. 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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38. Sensitive search for near-symmetric and super-asymmetric fusion-fission of the superheavy element Flerovium (Z=114)

Author

Banerjee, K., Hinde, D.J., Dasgupta, M., Sadhukhan, J., Simpson, E.C., Jeung, D.Y., Simenel, C., Swinton-Bland, B.M.A., Williams, E., Bezzina, L.T., Carter, I.P., Cook, K.J., Albers, H.M., Düllmann, Ch.E., Khuyagbaatar, J., Kindler, B., Lommel, B., Mokry, C., Prasad, E., Runke, J., Schunck, N., Sengupta, C., Smith, J.F., Thörle-Pospiech, P., Trautmann, N., Vo-Phuoc, K., Walshe, J., and Yakushev, A.

Published
2021
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43. 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
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44. 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

45. Study of heavy di-nuclear systems

Author

Heinz, S., Comas, V., Hofmann, S., Ackermann, D., Heredia, J., Heßberger, F.P., Khuyagbaatar, J., Kindler, B., Lommel, B., Mann, R., Golabek, C., Mittig, W., Rejmund, F., and Villari, A.C.C.

Published
2010
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46. NUCLEAR CHEMISTRY: Synthesis and detection of a seaborgium carbonyl complex

Author

Even, J., Yakushev, A., Düllmann, Ch. E., Haba, H., Asai, M., Sato, T. K., Brand, H., Di Nitto, A., Eichler, R., Fan, F. L., Hartmann, W., Huang, M., Jäger, E., Kaji, D., Kanaya, J., Kaneya, Y., Khuyagbaatar, J., Kindler, B., Kratz, J. V., Krier, J., Kudou, Y., Kurz, N., Lommel, B., Miyashita, S., Morimoto, K., Morita, K., Murakami, M., Nagame, Y., Nitsche, H., Ooe, K., Qjn, Z., Schädel, M., Steiner, J., Sumita, T., Takeyama, M., Tanaka, K., Toyoshima, A., Tsukada, K., Tiirler, A., Usoltsev, I., Wakabayashi, Y., Wang, Y., Wiehl, N., and Yamaki, S.

Published
2014
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49. The reaction 48Ca + 248Cm → 296116* studied at the GSI-SHIP

Author

Hofmann, S., Heinz, S., Mann, R., Maurer, J., Khuyagbaatar, J., Ackermann, D., Antalic, S., Barth, W., Block, M., Burkhard, H. G., Comas, V. F., Dahl, L., Eberhardt, K., Gostic, J., Henderson, R. A., Heredia, J. A., Heßberger, F. P., Kenneally, J. M., Kindler, B., Kojouharov, I., Kratz, J. V., Lang, R., Leino, M., Lommel, B., Moody, K. J., Münzenberg, G., Nelson, S. L., Nishio, K., Popeko, A. G., Runke, J., Saro, S., Shaughnessy, D. A., Stoyer, M. A., Thörle-Pospiech, P., Tinschert, K., Trautmann, N., Uusitalo, J., Wilk, P. A., and Yeremin, A. V.

Published
2012
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