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1. Decay spectroscopy at the two-proton drip line: Radioactivity of the new nuclides 160Os and 156W

Author

Briscoe, AD, Page, RD, Uusitalo, J, Joss, DT, AlAqeel, MAM, Alayed, B, Andel, B, Antalic, S, Auranen, K, Ayatollahzadeh, H, Badran, H, Barber, L, Beeton, G, Birova, M, Bogdanoff, V, Clark, RM, Cubiss, JG, Cullen, DM, Deary, J, Forsberg, U, Grahn, T, Greenlees, PT, Hilton, JB, Illana, A, Joukainen, H, Judson, DS, Julin, R, Jutila, H, Keatings, JM, Labiche, M, Leino, M, Lewis, MC, Louko, J, Luoma, M, Martel, I, McCarter, A, McKee, PP, Mosat, P, Nathaniel, SN, Neuvonen, O, O'Donnell, D, Ojala, J, Page, CAA, Plaza, AM, Pakarinen, J, Papadakis, P, Parr, E, Partanen, J, Rahkila, P, Ruotsalainen, P, Sandzelius, M, Sarén, J, Saygi, B, Smallcombe, J, Smith, JF, Sorri, J, Sullivan, CM, Szwec, S, Tann, H, Tolosa-Delgado, A, Uusikylä, E, Venhart, M, Waring, LJ, and Zimba, G

Subjects
Nuclear and Plasma Physics, Synchrotrons and Accelerators, Physical Sciences, Mathematical Physics, Astronomical and Space Sciences, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Nuclear & Particles Physics, Mathematical sciences, Physical sciences
Published
2023

2. 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

3. 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

4. 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

5. Study of multi-neutron systems with SAMURAI spectrometer

Author

Yang, Z. H., Marqués, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Böhmer, M., Boretzky, K., Caamaño, M., Chen, S., Chiga, N., Cortés, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernández-Domínguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gašparić, I., Ge, Z., Gernhäuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Godoy, B. M., Halász, Z., Harada, T., Harakeh, M. N., Hirayama, A., Huang, S. W., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Knösel, M. A., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I., Lehr, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Mayer, J., Miki, H., Miwa, M., Murray, I., Nakamura, T., Obertelli, A., Orr, N., Otsu, H., Panin, V., Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Stefan, I., Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Tscheuschner, H. T. Törnqvsit. J., Uesaka, T., Wagner, V., Wimmer, K., Yamada, H., Yang, B., Yang, L., Yasuda, Y., Yoneda, K., Zanetti, L., and Zenihiro, J.

Subjects
Nuclear Experiment
Abstract

The tetraneutron has been drawing the attention of the nuclear physics community for decades, but a firm conclusion on its existence and properties is still far from being reached despite many experimental and theoretical efforts. New measurements have recently been performed at RIBF with the SAMURAI spectrometer by applying complementary reaction probes, which will help to pin down the properties of this four-neutron system., Comment: 5 pages, 2 figures, conference proceedings of XXII International Conference on Few-Body Problems in Physics (FB22), Caen, France, July 2018

Published
2019

6. In-beam γ94-ray spectroscopy of γ94Ag

Author

Pereira-López, X., Bentley, M. A., Wadsworth, R., Ruotsalainen, P., Lenzi, S. M., Forsberg, U., Auranen, K., Blazhev, A., Cederwall, B., Grahn, T., Greenlees, P., Illana, A., Jenkins, D. G., Julin, R., Jutila, H., Juutinen, S., Liu, X., Llewelyn, R., Luoma, M., Moschner, K., Müller-Gatermann, C., Singh, B. S. Nara, Nowacki, F., Ojala, J., Pakarinen, J., Papadakis, P., Rahkila, P., Romero, J., Sandzelius, M., Sarén, J., Tann, H., Uthayakumaar, S., Uusitalo, J., Vega-Romero, J. G., Vilhena, J. M., Yajzey, R., Zhang, W., and Zimba, G.

Published
2023
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7. Observation of a correlated free four-neutron system

Author

Duer, M., Aumann, T., Gernhäuser, R., Panin, V., Paschalis, S., Rossi, D. M., Achouri, N. L., Ahn, D., Baba, H., Bertulani, C. A., Böhmer, M., Boretzky, K., Caesar, C., Chiga, N., Corsi, A., Cortina-Gil, D., Douma, C. A., Dufter, F., Elekes, Z., Feng, J., Fernández-Domínguez, B., Forsberg, U., Fukuda, N., Gasparic, I., Ge, Z., Gheller, J. M., Gibelin, J., Gillibert, A., Hahn, K. I., Halász, Z., Harakeh, M. N., Hirayama, A., Holl, M., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kobayashi, T., Kondo, Y., Körper, D., Koseoglou, P., Kubota, Y., Kuti, I., Li, P. J., Lehr, C., Lindberg, S., Liu, Y., Marqués, F. M., Masuoka, S., Matsumoto, M., Mayer, J., Miki, K., Monteagudo, B., Nakamura, T., Nilsson, T., Obertelli, A., Orr, N. A., Otsu, H., Park, S. Y., Parlog, M., Potlog, P. M., Reichert, S., Revel, A., Saito, A. T., Sasano, M., Scheit, H., Schindler, F., Shimoura, S., Simon, H., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Tanaka, J., Togano, Y., Tomai, T., Törnqvist, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Yamada, H., Yang, B., Yang, L., Yang, Z. H., Yasuda, M., Yoneda, K., Zanetti, L., Zenihiro, J., and Zhukov, M. V.

Published
2022
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8. 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

9. 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

10. 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

11. 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

12. High-precision mass measurements for the isobaric multiplet mass equation at A = 52

Author

Nesterenko, D. A., Kankainen, A., Canete, L., Block, M., Cox, D., Eronen, T., Fahlander, C., Forsberg, U., Gerl, J., Golubev, P., Hakala, J., Jokinen, A., Kolhinen, V. S., Koponen, J., Lalović, N., Lorenz, Ch., Moore, I. D., Papadakis, P., Reinikainen, J., Rinta-Antila, S., Rudolph, D., Sarmiento, L. G., Voss, A., and Äystö, J.

Subjects
Nuclear Experiment
Abstract

Masses of $^{52}$Co, $^{52}$Co$^m$, $^{52}$Fe, $^{52}$Fe$^m$, and $^{52}$Mn have been measured with the JYFLTRAP double Penning trap mass spectrometer. Of these, $^{52}$Co and $^{52}$Co$^m$ have been experimentally determined for the first time and found to be more bound than predicted by extrapolations. The isobaric multiplet mass equation for the $T=2$ quintet at $A=52$ has been studied employing the new mass values. No significant breakdown (beyond the $3\sigma$ level) of the quadratic form of the IMME was observed ($\chi^2/n=2.4$). The cubic coefficient was 6.0(32) keV ($\chi^2/n=1.1$). The excitation energies for the isomer and the $T=2$ isobaric analogue state in $^{52}$Co have been determined to be 374(13) keV and 2922(13) keV, respectively. The $Q$ value for the proton decay from the $19/2^-$ isomer in $^{53}$Co has been determined with an unprecedented precision, $Q_{p} = 1558.8(17)$ keV. The proton separation energies of $^{52}$Co and $^{53}$Ni relevant for the astrophysical rapid proton capture process have been experimentally determined for the first time. \end{abstract}, Comment: 12 pages, 13 figures, submitted to Phys. Rev. C (26.9.2016)

Published
2017
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13. 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

14. 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

15. Study of Multi-neutron Systems with SAMURAI Spectrometer

Author

Yang, Z. H., Marqués, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Böhmer, M., Boretzky, K., Caamaño, M., Chen, S., Chiga, N., Cortés, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernández-Domínguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gašparić, I., Ge, Z., Gernhäuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Godoy, B. M., Halász, Z., Harada, T., Harakeh, M. N., Hirayama, A., Huang, S. W., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Knösel, M. A., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I., Lehr, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Mayer, J., Miki, H., Miwa, M., Murray, I., Nakamura, T., Obertelli, A., Orr, N. A., Otsu, H., Panin, V., Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Stefan, I., Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Törnqvsit, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Wimmer, K., Yamada, H., Yang, B., Yang, L., Yasuda, Y., Yoneda, K., Zanetti, L., Zenihiro, J., Orr, N. A., editor, Ploszajczak, M., editor, Marqués, F. M., editor, and Carbonell, J., editor

Published
2020
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16. Recoil-alpha-fission and recoil-alpha-alpha-fission events observed in the reaction Ca-48 + Am-243

Author

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

Subjects
Nuclear Experiment
Abstract

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

Published
2015
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17. 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

18. Decay spectroscopy at the two-proton drip line: Radioactivity of the new nuclides 160Os and 156W

Author

Briscoe, A.D., primary, Page, R.D., additional, Uusitalo, J., additional, Joss, D.T., additional, AlAqeel, M.A.M., additional, Alayed, B., additional, Andel, B., additional, Antalic, S., additional, Auranen, K., additional, Ayatollahzadeh, H., additional, Badran, H., additional, Barber, L., additional, Beeton, G., additional, Birova, M., additional, Bogdanoff, V., additional, Clark, R.M., additional, Cubiss, J.G., additional, Cullen, D.M., additional, Deary, J., additional, Forsberg, U., additional, Grahn, T., additional, Greenlees, P.T., additional, Hilton, J.B., additional, Illana, A., additional, Joukainen, H., additional, Judson, D.S., additional, Julin, R., additional, Jutila, H., additional, Keatings, J.M., additional, Labiche, M., additional, Leino, M., additional, Lewis, M.C., additional, Louko, J., additional, Luoma, M., additional, Martel, I., additional, McCarter, A., additional, McKee, P.P., additional, Mosat, P., additional, Nathaniel, S.N., additional, Neuvonen, O., additional, O'Donnell, D., additional, Ojala, J., additional, Page, C.A.A., additional, Plaza, A.M., additional, Pakarinen, J., additional, Papadakis, P., additional, Parr, E., additional, Partanen, J., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Saygi, B., additional, Smallcombe, J., additional, Smith, J.F., additional, Sorri, J., additional, Sullivan, C.M., additional, Szwec, S., additional, Tann, H., additional, Tolosa-Delgado, A., additional, Uusikylä, E., additional, Venhart, M., additional, Waring, L.J., additional, and Zimba, G., additional

Published
2023
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19. The spectroscopic quadrupole moment of the 21+ state of 12C: A benchmark of theoretical models

Author

Saiz-Lomas, J., primary, Petri, M., additional, Lee, I.Y., additional, Syndikus, I., additional, Heil, S., additional, Allmond, J.M., additional, Gaffney, L.P., additional, Pakarinen, J., additional, Badran, H., additional, Calverley, T., additional, Cox, D.M., additional, Forsberg, U., additional, Grahn, T., additional, Greenlees, P., additional, Hadyńska-Klȩk, K., additional, Hilton, J., additional, Jenkinson, M., additional, Julin, R., additional, Konki, J., additional, Macchiavelli, A.O., additional, Mathy, M., additional, Ojala, J., additional, Papadakis, P., additional, Partanen, J., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Stolze, S., additional, Uusitalo, J., additional, and Wadsworth, R., additional

Published
2023
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20. Experimental Study of 4n by Directly Detecting the Decay Neutrons

Author

Huang, S. W., Yang, Z. H., Marqués, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Böhmer, M., Boretzky, K., Caamaño, M., Chen, S., Chiga, N., Cortés, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernández-Domínguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gašparić, I., Ge, Z., Gernhäuser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Halász, Z., Harada, T., Harakeh, M. N., Hirayama, A., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Kim, D., Kim, S., Kiyotake, S., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I., Lehr, C., Lenain, C., Li, P. J., Liu, Y., Maeda, Y., Masuoka, S., Matsumoto, M., Matta, A., Mayer, J., Miki, H., Miwa, M., Monteagudo, B., Murray, I., Nakamura, T., Obertelli, A., Orr, N. A., Otsu, H., Panin, V., Park, S., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Simon, H., Stefan, I., Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Törnqvist, H. T., Tronchin, E., Tscheuschner, J., Uesaka, T., Wagner, V., Wimmer, K., Yamada, H., Yang, B., Yang, L., Yasuda, Y., Yoneda, K., Zanetti, L., and Zenihiro, J.

Published
2021
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21. Decay spectroscopy of element 115 daughters: Rg 280 → Mt 276 and Mt 276 → Bh 272

Author

Gates, JM, Gregorich, KE, Gothe, OR, Uribe, EC, Pang, GK, Bleuel, DL, Block, M, Clark, RM, Campbell, CM, Crawford, HL, Cromaz, M, Di Nitto, A, Düllmann, CE, Esker, NE, Fahlander, C, Fallon, P, Farjadi, RM, Forsberg, U, Khuyagbaatar, J, Loveland, W, Macchiavelli, AO, May, EM, Mudder, PR, Olive, DT, Rice, AC, Rissanen, J, Rudolph, D, Sarmiento, LG, Shusterman, JA, Stoyer, MA, Wiens, A, Yakushev, A, and Nitsche, H

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

Forty-six decay chains, assigned to the decay of 115288, were produced using the Am243(Ca48,3n)115288 reaction at the Lawrence Berkeley National Laboratory 88-in. cyclotron. The resulting series of α decays were studied using α-photon and α-x-ray spectroscopies. Multiple α-photon coincidences were observed in the element 115 decay chain members, particularly in the third- and fourth-generation decays (presumed to be Rg280 and Mt276, respectively). Upon combining these data with those from 22 115288 decay chains observed in a similar experiment, updated level schemes in Mt276 and Bh272 (populated by the α decay of Rg280 and Mt276, respectively) are proposed. Photons were observed in the energy range expected for K x rays coincident with the α decay of both Rg280 and Mt276. However, Compton scattering of higher-energy γ rays and discrete transitions are present in the K x-ray region preventing a definitive Z identification to be made based on observation of characteristic K x-ray energies.

Published
2015

22. Decay spectroscopy of element 115 daughters:Rg280→Mt276 and Mt276→Bh272

Author

Gates, JM, Gregorich, KE, Gothe, OR, Uribe, EC, Pang, GK, Bleuel, DL, Block, M, Clark, RM, Campbell, CM, Crawford, HL, Cromaz, M, Di Nitto, A, Düllmann, Ch E, Esker, NE, Fahlander, C, Fallon, P, Farjadi, RM, Forsberg, U, Khuyagbaatar, J, Loveland, W, Macchiavelli, AO, May, EM, Mudder, PR, Olive, DT, Rice, AC, Rissanen, J, Rudolph, D, Sarmiento, LG, Shusterman, JA, Stoyer, MA, Wiens, A, Yakushev, A, and Nitsche, H

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

Forty-six decay chains, assigned to the decay of 115288, were produced using the Am243(Ca48,3n)115288 reaction at the Lawrence Berkeley National Laboratory 88-in. cyclotron. The resulting series of α decays were studied using α-photon and α-x-ray spectroscopies. Multiple α-photon coincidences were observed in the element 115 decay chain members, particularly in the third- and fourth-generation decays (presumed to be Rg280 and Mt276, respectively). Upon combining these data with those from 22 115288 decay chains observed in a similar experiment, updated level schemes in Mt276 and Bh272 (populated by the α decay of Rg280 and Mt276, respectively) are proposed. Photons were observed in the energy range expected for K x rays coincident with the α decay of both Rg280 and Mt276. However, Compton scattering of higher-energy γ rays and discrete transitions are present in the K x-ray region preventing a definitive Z identification to be made based on observation of characteristic K x-ray energies.

Published
2015

23. 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

24. High- K three-quasiparticle isomers in the proton-rich nucleus Nd129

Author

Petrache, C. M., primary, Uusitalo, J., additional, Briscoe, A. D., additional, Sullivan, C. M., additional, Joss, D. T., additional, Tann, H., additional, Aktas, Ö., additional, Alayed, B., additional, Al-Aqeel, M. A. M., additional, Astier, A., additional, Badran, H., additional, Cederwall, B., additional, Delafosse, C., additional, Ertoprak, A., additional, Favier, Z., additional, Forsberg, U., additional, Gins, W., additional, Grahn, T., additional, Greenlees, P. T., additional, He, X. T., additional, Heery, J., additional, Hilton, J., additional, Kalantan, S., additional, Li, R., additional, Jodidar, P. M., additional, Julin, R., additional, Juutinen, S., additional, Leino, M., additional, Lewis, M. C., additional, Li, J. G., additional, Li, Z. P., additional, Luoma, M., additional, Lv, B. F., additional, McCarter, A., additional, Nathaniel, S., additional, Ojala, J., additional, Page, R. D., additional, Pakarinen, J., additional, Papadakis, P., additional, Parr, E., additional, Partanen, J., additional, Paul, E. S., additional, Rahkila, P., additional, Ruotsalainen, P., additional, Sandzelius, M., additional, Sarén, J., additional, Smallcombe, J., additional, Sorri, J., additional, Szwec, S., additional, Wang, L. J., additional, Wang, Y., additional, Waring, L., additional, Xu, F. R., additional, Zhang, J., additional, Zhang, Z. H., additional, Zheng, K. K., additional, and Zimba, G., additional

Published
2023
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25. Study of Multi-neutron Systems with SAMURAI Spectrometer

Author

Yang, Z. H., primary, Marqués, F. M., additional, Achouri, N. L., additional, Ahn, D. S., additional, Aumann, T., additional, Baba, H., additional, Beaumel, D., additional, Böhmer, M., additional, Boretzky, K., additional, Caamaño, M., additional, Chen, S., additional, Chiga, N., additional, Cortés, M. L., additional, Cortina, D., additional, Doornenbal, P., additional, Douma, C. A., additional, Dufter, F., additional, Feng, J., additional, Fernández-Domínguez, B., additional, Elekes, Z., additional, Forsberg, U., additional, Fujino, T., additional, Fukuda, N., additional, Gašparić, I., additional, Ge, Z., additional, Gernhäuser, R., additional, Gheller, J. M., additional, Gibelin, J., additional, Gillibert, A., additional, Godoy, B. M., additional, Halász, Z., additional, Harada, T., additional, Harakeh, M. N., additional, Hirayama, A., additional, Huang, S. W., additional, Inabe, N., additional, Isobe, T., additional, Kahlbow, J., additional, Kalantar-Nayestanaki, N., additional, Kim, D., additional, Kim, S., additional, Knösel, M. A., additional, Kobayashi, T., additional, Kondo, Y., additional, Koseoglou, P., additional, Kubota, Y., additional, Kuti, I., additional, Lehr, C., additional, Li, P. J., additional, Liu, Y., additional, Maeda, Y., additional, Masuoka, S., additional, Matsumoto, M., additional, Mayer, J., additional, Miki, H., additional, Miwa, M., additional, Murray, I., additional, Nakamura, T., additional, Obertelli, A., additional, Orr, N. A., additional, Otsu, H., additional, Panin, V., additional, Park, S., additional, Parlog, M., additional, Paschalis, S., additional, Potlog, M., additional, Reichert, S., additional, Revel, A., additional, Rossi, D., additional, Saito, A., additional, Sasano, M., additional, Sato, H., additional, Scheit, H., additional, Schindler, F., additional, Shimada, T., additional, Shimizu, Y., additional, Shimoura, S., additional, Stefan, I., additional, Storck, S., additional, Stuhl, L., additional, Suzuki, H., additional, Symochko, D., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, J., additional, Togano, Y., additional, Tomai, T., additional, Törnqvsit, H. T., additional, Tscheuschner, J., additional, Uesaka, T., additional, Wagner, V., additional, Wimmer, K., additional, Yamada, H., additional, Yang, B., additional, Yang, L., additional, Yasuda, Y., additional, Yoneda, K., additional, Zanetti, L., additional, and Zenihiro, J., additional

Published
2020
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26. First experiment at TASCA towards X-ray fingerprinting of element 115 decay chains

Author

Forsberg, U, Golubev, P, Sarmiento, LG, Jeppsson, J, Rudolph, D, Andersson, LL, Ackermann, D, Asai, M, Block, M, Eberhardt, K, Even, J, Düllmann, CE, Dvorak, J, Gates, JM, Gregorich, KE, Herzberg, RD, Heßberger, FP, Jäger, E, Khuyagbaatar, J, Kojouharov, I, Kratz, JV, Krier, J, Kurz, N, Lahiri, S, Lommel, B, Maiti, M, Merchán, E, Omtvedt, JP, Parr, E, Runke, J, Schaffner, H, Schädel, M, and Yakushev, A

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

To identify the atomic number of superheavy nuclei produced in 48Ca-induced fusion-evaporation reactions, an experiment aiming at measuring characteristic X-rays is being prepared at GSI, Darmstadt, Germany. The gas-filled separator TASCA will be employed, sending the residues towards the multi-coincidence detector setup TASISpec. Two ionoptical modes relying on differing magnetic polarities of the quadrupole magnets can be used at TASCA. New simulations and experimental tests of transmission and background suppression for these two focusing modes into TASISpec are presented.

Published
2012

27. The spectroscopic quadrupole moment of the [formula omitted] state of 12C: A benchmark of theoretical models

Author

Saiz-Lomas, J., Petri, M., Lee, I.Y., Syndikus, I., Heil, S., Allmond, J.M., Gaffney, L.P., Pakarinen, J., Badran, H., Calverley, T., Cox, D.M., Forsberg, U., Grahn, T., Greenlees, P., Hadyńska-Klȩk, K., Hilton, J., Jenkinson, M., Julin, R., Konki, J., Macchiavelli, A.O., Mathy, M., Ojala, J., Papadakis, P., Partanen, J., Rahkila, P., Ruotsalainen, P., Sandzelius, M., Sarén, J., Stolze, S., Uusitalo, J., and Wadsworth, R.

Published
2023
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28. In-beam $$\gamma $$-ray spectroscopy of $$^{94}$$Ag

Author

Pereira-López, X., primary, Bentley, M. A., additional, Wadsworth, R., additional, Ruotsalainen, P., additional, Lenzi, S. M., additional, Forsberg, U., additional, Auranen, K., additional, Blazhev, A., additional, Cederwall, B., additional, Grahn, T., additional, Greenlees, P., additional, Illana, A., additional, Jenkins, D. G., additional, Julin, R., additional, Jutila, H., additional, Juutinen, S., additional, Liu, X., additional, Llewelyn, R., additional, Luoma, M., additional, Moschner, K., additional, Müller-Gatermann, C., additional, Singh, B. S. Nara, additional, Nowacki, F., additional, Ojala, J., additional, Pakarinen, J., additional, Papadakis, P., additional, Rahkila, P., additional, Romero, J., additional, Sandzelius, M., additional, Sarén, J., additional, Tann, H., additional, Uthayakumaar, S., additional, Uusitalo, J., additional, Vega-Romero, J. G., additional, Vilhena, J. M., additional, Yajzey, R., additional, Zhang, W., additional, and Zimba, G., additional

Published
2023
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29. 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
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30. 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
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31. 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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32. In-beam γ -ray spectroscopy of 94 Ag

Author

Pereira-Lopez, X., Bentley, M. A., Wadsworth, R., Ruotsalainen, P., Lenzi, S. M., Forsberg, U., Auranen, K., Blazhev, A., Cederwall, B., Grahn, T., Greenlees, P., Illana, A., Jenkins, D. G., Julin, R., Jutila, H., Juutinen, S., Liu, X., Llewelyn, R., Luoma, M., Moschner, K., Müller-Gatermann, C., Singh, B. S. Nara, Nowacki, F., Ojala, J., Pakarinen, J., Papadakis, P., Rahkila, P., Romero, J., Sandzelius, M., Saren, J., Tann, H., Uthayakumaar, S., Uusitalo, J., Vega-Romero, J. G., Vilhena, J. M., Yajzey, R., Zhang, W., Zimba, G., and Helsinki Institute of Physics

Subjects
Coulomb energy differences, Excited-states, Proton, Decay, Ag, 114 Physical sciences, Isomer
Published
2023

33. 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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34. 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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35. 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

36. 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

37. In-beam γ-ray spectroscopy of 94Ag

Author

Pereira-López, X., Bentley, M. A., Wadsworth, R., Ruotsalainen, P., Lenzi, S. M., Forsberg, U., Auranen, K., Blazhev, A., Cederwall, B., Grahn, T., Greenlees, P., Illana, A., Jenkins, D. G., Julin, R., Jutila, H., Juutinen, S., Liu, X., Llewelyn, R., Luoma, M., Moschner, K., Müller-Gatermann, C., Nara Singh, B. S., Nowacki, F., Ojala, J., Pakarinen, J., Papadakis, P., Rahkila, P., Romero, J., Sandzelius, M., Sarén, J., Tann, H., Uthayakumaar, S., Uusitalo, J., Vega-Romero, J. G., Vilhena, J. M., Yajzey, R., Zhang, W., and Zimba, G.

Subjects
spektroskopia, hopea, ydinfysiikka
Abstract

A recoil-beta-tagging experiment has been per formed to study the excited T = 0 and T = 1 states in the odd–odd N = Z nucleus 94Ag, populated via the 40Ca(58Ni,1p3n)94Ag reaction. The experiment was con ducted using the MARA recoil separator and JUROGAM3 array at the Accelerator Laboratory of the University of Jyväskylä. Through correlating fast, high-energy beta decays at the MARA focal plane with prompt γ rays emitted at the reaction target, a number of transitions between excited states in 94Ag have been identified. The timing characteris tics of these transitions confirm that they fall within decay sequences that feed the short-lived T = 1 ground state of 94Ag. The transitions are proposed to proceed within and between the sets of states with T = 0 and T = 1. Possi ble correspondence between some of these transitions from analog states in 94Pd has been discussed, and shell-model cal culations including multipole and monopole electromagnetic effects have been presented, in order to enable predictions of the decay patterns between the T = 0 and T = 1 states and to allow a theoretical set of Coulomb energy differences to be calculated for the A = 94 T = 1 analog states. peerReviewed

Published
2023

38. 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

40. List of contributors

Author

Abe, F., primary, Barnard, P., additional, Blum, R., additional, Chai, G., additional, deBarbadillo, J.J., additional, Di Gianfrancesco, A., additional, Forsberg, U., additional, Fukuda, M., additional, Hald, J., additional, Klöwer, J., additional, Kruger, K.L., additional, Liu, Z., additional, Lucacci, G., additional, Masuyama, F., additional, Roberts, S., additional, Schraven, P., additional, Shingledecker, J.P., additional, Sorrentino, S., additional, Spiegel, M., additional, Xie, X., additional, and Zeiler, G., additional

Published
2017
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41. 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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42. Experimental Study of $$^{4}n$$ by Directly Detecting the Decay Neutrons

Author

Huang, S. W., primary, Yang, Z. H., additional, Marqués, F. M., additional, Achouri, N. L., additional, Ahn, D. S., additional, Aumann, T., additional, Baba, H., additional, Beaumel, D., additional, Böhmer, M., additional, Boretzky, K., additional, Caamaño, M., additional, Chen, S., additional, Chiga, N., additional, Cortés, M. L., additional, Cortina, D., additional, Doornenbal, P., additional, Douma, C. A., additional, Dufter, F., additional, Feng, J., additional, Fernández-Domínguez, B., additional, Elekes, Z., additional, Forsberg, U., additional, Fujino, T., additional, Fukuda, N., additional, Gašparić, I., additional, Ge, Z., additional, Gernhäuser, R., additional, Gheller, J. M., additional, Gibelin, J., additional, Gillibert, A., additional, Halász, Z., additional, Harada, T., additional, Harakeh, M. N., additional, Hirayama, A., additional, Inabe, N., additional, Isobe, T., additional, Kahlbow, J., additional, Kalantar-Nayestanaki, N., additional, Kim, D., additional, Kim, S., additional, Kiyotake, S., additional, Kobayashi, T., additional, Kondo, Y., additional, Koseoglou, P., additional, Kubota, Y., additional, Kuti, I., additional, Lehr, C., additional, Lenain, C., additional, Li, P. J., additional, Liu, Y., additional, Maeda, Y., additional, Masuoka, S., additional, Matsumoto, M., additional, Matta, A., additional, Mayer, J., additional, Miki, H., additional, Miwa, M., additional, Monteagudo, B., additional, Murray, I., additional, Nakamura, T., additional, Obertelli, A., additional, Orr, N. A., additional, Otsu, H., additional, Panin, V., additional, Park, S., additional, Parlog, M., additional, Paschalis, S., additional, Potlog, M., additional, Reichert, S., additional, Revel, A., additional, Rossi, D., additional, Saito, A., additional, Sasano, M., additional, Sato, H., additional, Scheit, H., additional, Schindler, F., additional, Shimada, T., additional, Shimizu, Y., additional, Shimoura, S., additional, Simon, H., additional, Stefan, I., additional, Storck, S., additional, Stuhl, L., additional, Suzuki, H., additional, Symochko, D., additional, Takeda, H., additional, Takeuchi, S., additional, Tanaka, J., additional, Togano, Y., additional, Tomai, T., additional, Törnqvist, H. T., additional, Tronchin, E., additional, Tscheuschner, J., additional, Uesaka, T., additional, Wagner, V., additional, Wimmer, K., additional, Yamada, H., additional, Yang, B., additional, Yang, L., additional, Yasuda, Y., additional, Yoneda, K., additional, Zanetti, L., additional, and Zenihiro, J., additional

Published
2021
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43. 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

44. High-precision mass measurements of 203-207Rn and 213Ra with SHIPTRAP

Author

Droese, C., Ackermann, D., Andersson, L. -L., Blaum, K., Block, M., Dworschak, M., Eibach, M., Eliseev, S., Forsberg, U., Haettner, E., Herfurth, F., Heßberger, F. P., Hofmann, S., Ketelaer, J., Marx, G., Minaya Ramirez, E., Nesterenko, D., Novikov, Yu. N., Plaß, W. R., Rodríguez, D., Rudolph, D., Scheidenberger, C., Schweikhard, L., Stolze, S., Thirolf, P. G., and Weber, C.

Published
2013
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45. Experimental study of 4n with 8He(p,2p) reaction

Author

Huang, S. W., Marqués, F. M., Achouri, N. L., Ahn, D. S., Aumann, T., Baba, H., Beaumel, D., Böhmer, M., Boretzky, K., Caamano, M., Chiga, N., Cortés, M. L., Cortina, D., Doornenbal, P., Douma, C. A., Dufter, F., Feng, J., Fernández-Domínguez, B., Elekes, Z., Forsberg, U., Fujino, T., Fukuda, N., Gašparić, I., Ge, Z., Gernhauser, R., Gheller, J. M., Gibelin, J., Gillibert, A., Godoy, B. M., Halász, Z., Harada, T., Harakeh, M. N., Hirayama, A., Inabe, N., Isobe, T., Kahlbow, J., Kalantar-Nayestanaki, N., Knösel, M. A., Kobayashi, T., Kondo, Y., Koseoglou, P., Kubota, Y., Kuti, I., Lehr, C., Maeda, Y., Masuoka, S., Matsumoto, M., Mayer, J., Miki, H., Miwa, M., Murray, I., Nakamura, T., Obertelli, A., Orr, N., Otsu, H., Panin, V., Parlog, M., Paschalis, S., Potlog, M., Reichert, S., Revel, A., Rossi, D., Saito, A., Sasano, M., Sato, H., Scheit, H., Schindler, F., Shimada, T., Shimizu, Y., Shimoura, S., Stefan, I., Storck, S., Stuhl, L., Suzuki, H., Symochko, D., Takeda, H., Takeuchi, S., Tanaka, J., Togano, Y., Tomai, T., Törnqvsit, H. T., Tscheuschner, J., Uesaka, T., Wagner, V., Wimmer, K., Yamada, H., Yasuda, Y., Yoneda, K., Zanetti, L., Zenihiro, J., Elidiano, T., and Lenain, C.

Abstract

The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or non-existence. A new experiment based on 8He(p,2p)7H{t+4 n} reaction, with direct detection of the four neutrons, has been carried out at RIBF, which can hopefully help to draw a definite conclusion on the tetraneutron system.

Published
2020

46. 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

47. 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
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48. 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
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49. Superheavy-element spectroscopy: Correlations along element 115 decay chains

Author

Rudolph D., Forsberg U., Sarmiento L.G., Golubev P., and Fahlander C.

Subjects
Physics, QC1-999
Abstract

Following a brief summary of the region of the heaviest atomic nuclei yet created in the laboratory, data on more than hundred α-decay chains associated with the production of element 115 are combined to investigate time and energy correlations along the observed decay chains. Several of these are analysed using a new method for statistical assessments of lifetimes in sets of decay chains.

Published
2016
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