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1. Radioactive Beams for Image-Guided Particle Therapy: The BARB Experiment at GSI

Author

Daria Boscolo, Daria Kostyleva, Mohammad Javad Safari, Vasiliki Anagnostatou, Juha Äystö, Soumya Bagchi, Tim Binder, Georgios Dedes, Peter Dendooven, Timo Dickel, Vasyl Drozd, Bernhard Franczack, Hans Geissel, Chiara Gianoli, Christian Graeff, Tuomas Grahn, Florian Greiner, Emma Haettner, Roghieh Haghani, Muhsin N. Harakeh, Felix Horst, Christine Hornung, Jan-Paul Hucka, Nasser Kalantar-Nayestanaki, Erika Kazantseva, Birgit Kindler, Ronja Knöbel, Natalia Kuzminchuk-Feuerstein, Bettina Lommel, Ivan Mukha, Chiara Nociforo, Shunki Ishikawa, Giulio Lovatti, Munetaka Nitta, Ikechi Ozoemelam, Stephane Pietri, Wolfgang R. Plaß, Andrej Prochazka, Sivaji Purushothaman, Claire-Anne Reidel, Heidi Roesch, Fabio Schirru, Christoph Schuy, Olga Sokol, Timo Steinsberger, Yoshiki K. Tanaka, Isao Tanihata, Peter Thirolf, Walter Tinganelli, Bernd Voss, Uli Weber, Helmut Weick, John S. Winfield, Martin Winkler, Jianwei Zhao, Christoph Scheidenberger, Katia Parodi, Marco Durante, and the Super-FRS Experiment Collaboration

Subjects
particle therapy, radioactive ion beams, carbon ions, oxygen ions, PET, Neoplasms. Tumors. Oncology. Including cancer and carcinogens, RC254-282
Abstract

Several techniques are under development for image-guidance in particle therapy. Positron (β+) emission tomography (PET) is in use since many years, because accelerated ions generate positron-emitting isotopes by nuclear fragmentation in the human body. In heavy ion therapy, a major part of the PET signals is produced by β+-emitters generated via projectile fragmentation. A much higher intensity for the PET signal can be obtained using β+-radioactive beams directly for treatment. This idea has always been hampered by the low intensity of the secondary beams, produced by fragmentation of the primary, stable beams. With the intensity upgrade of the SIS-18 synchrotron and the isotopic separation with the fragment separator FRS in the FAIR-phase-0 in Darmstadt, it is now possible to reach radioactive ion beams with sufficient intensity to treat a tumor in small animals. This was the motivation of the BARB (Biomedical Applications of Radioactive ion Beams) experiment that is ongoing at GSI in Darmstadt. This paper will present the plans and instruments developed by the BARB collaboration for testing the use of radioactive beams in cancer therapy.

Published
2021
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3. TASCAを用いたCn, Nh, Fl化学実験のためのHg, Tl, PbのSiO2及びAu表面に対するオンライン化学吸着研究

Author

Lotte Lens, Alexander Yakushev, Christoph Emanuel Düllmann, Masato Asai, Jochen Ballof, Michael Block, Helena May David, John Despotopulos, Antonio Di Nitto, Klaus Eberhardt, Julia Even, Michael Götz, Stefan Götz, Hiromitsu Haba, Laura Harkness-Brennan, Fritz Peter Heßberger, Rodi D. Herzberg, Jan Hoffmann, Annett Hübner, Egon Jäger, Daniel Judson, Jadambaa Khuyagbaatar, Birgit Kindler, Yukiko Komori, Joonas Konki, Jens Volker Kratz, Jörg Krier, Nikolaus Kurz, Mustapha Laatiaoui, Susanta Lahiri, Bettina Lommel, Moumita Maiti, Andrew K. Mistry, Christoph Mokry, Ken Moody, Yuichiro Nagame, Jon Petter Omtvedt, Philippos Papadakis, Valeria Pershina, Jörg Runke, Matthias Schädel, Paul Scharrer, Tetsuya Sato, Dawn Shaughnessy, Brigitta Schausten, Petra Thörle-Pospiech, Norbert Trautmann, Kazuaki Tsukada, Juha Uusitalo, Andrew Ward, Maciej Wegrzecki, Norbert Wiehl, Vera Yakusheva, Research unit Nuclear & Hadron Physics, Lens, Lotte, Yakushev, Alexander, Düllmann, Christoph Emanuel, Asai, Masato, Ballof, Jochen, Block, Michael, David, Helena May, Despotopulos, John, Di Nitto, Antonio, Eberhardt, Klau, Even, Julia, Götz, Michael, Götz, Stefan, Haba, Hiromitsu, Harkness-Brennan, Laura, Heßberger, Fritz Peter, Herzberg, Rodi D., Hoffmann, Jan, Hübner, Annett, Jäger, Egon, Judson, Daniel, Khuyagbaatar, Jadambaa, Kindler, Birgit, Komori, Yukiko, Konki, Joona, Kratz, Jens Volker, Krier, Jörg, Kurz, Nikolau, Laatiaoui, Mustapha, Lahiri, Susanta, Lommel, Bettina, Maiti, Moumita, Mistry, Andrew K., Mokry, Christoph, Moody, Ken, Nagame, Yuichiro, Omtvedt, Jon Petter, Papadakis, Philippo, Pershina, Valeria, Runke, Jörg, Schädel, Matthia, Scharrer, Paul, Sato, Tetsuya, Shaughnessy, Dawn, Schausten, Brigitta, Thörle-Pospiech, Petra, Trautmann, Norbert, Tsukada, Kazuaki, Uusitalo, Juha, Ward, Andrew, Wegrzecki, Maciej, Wiehl, Norbert, and Yakusheva, Vera

Subjects
Analytical chemistry, chemistry.chemical_element, Electronic structure, 010402 general chemistry, 01 natural sciences, adsorption studie, thermochromatography, Homologs of superheavy element, RELATIVISTIC PERIODIC DFT, Metal, GSI, Adsorption, CHEMISTRY, 0103 physical sciences, isothermal chromatography, Physical and Theoretical Chemistry, SUPERHEAVY ELEMENTS, 010306 general physics, Copernicium, Chemistry, QUARTZ SURFACE, 0104 chemical sciences, gas phase chromatography of single atom, HEAVIEST ELEMENTS, Flerovium, ELECTRONIC-STRUCTURE, visual_art, Yield (chemistry), METAL, visual_art.visual_art_medium, Gas chromatography, Relativistic quantum chemistry, physical preseparation, SYSTEM
Abstract

Online gas-solid adsorption studies with single atom quantities of Hg, Tl, and Pb on SiO$_{2}$ and Au surfaces were carried out using short-lived radioisotopes with half-lives in the range of 4-49 s. This is a model study to measure adsorption enthalpies of superheavy elements Cn, Nh, and Fl. The short-lived isotopes were produced and separated by the gas-filled recoil separator TASCA at GSI. The products were stopped in He gas, and flushed into gas chromatography columns made of Si detectors whose surfaces were covered by SiO$_{2}$ or Au. The short-lived Tl and Pb were successfully measured by the Si detectors with the SiO$_{2}$ surface at room temperature. On the other hand, the Hg did not adsorb on the SiO$_{2}$ surface, but adsorbed on the Au surface. The results demonstrated that the adsorption properties of short-lived Hg, Tl, and Pb could be studied with this setup, and that this method is applicable to the experiment for Cn, Nh, and Fl., 半減期4$\sim$49秒の短寿命同位体を用いて、水銀(Hg), タリウム(Tl), 鉛(Pb)の単一原子レベルでのSiO$_{2}$及びAu表面への固体吸着挙動をオンライン気相実験により調べた。超重元素Cn, Nh, Flの吸着エンタルピー測定のためのモデル実験として実施した。短寿命同位体はドイツ重イオン研究所の反跳核分離装置TASCAを用いて生成・分離した。生成核はヘリウムガス中に捕集された後、SiO$_{2}$あるいはAuで表面を覆われたSi検出器で作製されたガスクロマトグラフィーカラムへと導入した。短寿命Tl及びPb同位体は室温においてSiO$_{2}$表面に吸着し、Si検出器で測定することに成功した。一方、HgはSiO$_{2}$表面には吸着せず、Au表面に吸着した。この結果より、本実験のセットアップを用いることで短寿命Hg, Tl, Pb同位体の吸着特性を調べることができると証明され、この手法がCn, Nh, Flの実験にも適用できることが確認された。

Published
2018

4. Application of a novel gas phase synthesis approach to carbonyl complexes of accelerator-produced 5d transition metals

Author

Michael Götz, Alexander Yakushev, Stefan Götz, Antonio Di Nitto, Christoph E. Düllmann, Masato Asai, Birgit Kindler, Jörg Krier, Bettina Lommel, Yuichiro Nagame, Tetsuya K. Sato, Hayato Suzuki, Tomohiro Tomitsuka, Katsuyuki Tokoi, Atsushi Toyoshima, Kazuaki Tsukada, Gotz, M., Yakushev, A., Gotz, S., Di Nitto, A., Dullmann, C. E., Asai, M., Kindler, B., Krier, J., Lommel, B., Nagame, Y., Sato, T. K., Suzuki, H., Tomitsuka, T., Tokoi, K., Toyoshima, A., and Tsukada, K.

Subjects
carbonyl complexe, in-situ synthesi, carbonyl complex synthesi, short-lived isotopes, Physical and Theoretical Chemistry, fusion product
Abstract

In 2014 the first synthesis of a transactinide carbonyl complex – seaborgium hexacarbonyl – was reported. This was achieved in gas-phase chemical experiments in a beam-free environment behind the recoil separator GARIS. Extending this work to heavier elements requires more efficient techniques to synthesize carbonyl complexes as production rates of transactinide elements drop with increasing atomic number. A novel approach was thus conceived, which retains the benefit of a beam-free environment but avoids the physical preseparation step. The latter reduces the yields for products of asymmetric reactions such as those used for the synthesis of suitable isotopes of Sg, Bh, Hs and Mt. For this a series of experiments with accelerator-produced radioisotopes of the lighter homologues W, Re and Os was carried out at the tandem accelerator of JAEA Tokai, Japan. A newly developed double-chamber system, which allows for a decoupled recoil ion thermalization and chemical complex formation, was used, which avoids the low-efficiency physical preseparation step. Here, we demonstrate the feasibility of this newly developed method using accelerator-produced short-lived radioisotopes of the 5d homologues of the early transactinides.

Published
2021

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

Author

J.F. Smith, Petra Thörle-Pospiech, Jhilam Sadhukhan, Ch. E. Düllmann, B. M. A. Swinton-Bland, J. Khuyagbaatar, Ian Carter, K. Banerjee, Norbert Trautmann, C. Sengupta, Cedric Simenel, Jörg Runke, Birgit Kindler, D. Y. Jeung, K. Vo-Phuoc, C. Mokry, Nicolas Schunck, Edward Simpson, H. M. Albers, Kaitlin Cook, E. Prasad, Mahananda Dasgupta, David Hinde, L. T. Bezzina, Elizabeth Williams, Bettina Lommel, Alexander Yakushev, and J. Walshe

Subjects
Physics, Nuclear and High Energy Physics, Fusion, Component (thermodynamics), Fission, Projectile, QC1-999, chemistry.chemical_element, Isotopes of flerovium, Flerovium, Superheavy element, chemistry, Nuclear fission dynamics, Yield (chemistry), Mass spectrum, ddc:530, Atomic physics, Nuclear Experiment, Microscopic model calculations
Abstract

Physics letters / B 820, 136601 (2021). doi:10.1016/j.physletb.2021.136601, Published by North-Holland Publ., Amsterdam

Published
2021

6. Search for η'-mesic nuclei using (p,d) reaction with FRS/Super-FRS at GSI/FAIR

Author

R. Kanungo, Oleksandr Rundel, Haruhiko Outa, Isao Tanihata, C. Scheidenberger, C. Guo, N. Kuzminchuk, N. Ikeno, S. Purushothaman, E. Haettner, M.N. Harakeh, S. Terashima, Frank Goldenbaum, H. Fujioka, Timo Dickel, R. Knöbel, J. Zhao, Yasumoto Tanaka, James Ritman, Birgit Kindler, Bao-Hua Sun, J. L. Rodriguez-Sanchez, Ryugo S. Hayano, Satoru Hirenzaki, Hideko Nagahiro, I. G. Mukha, W. R. Plass, Peter Strmen, Magdalena Skurzok, Christine Hornung, T.R. Saito, Hiroyuki Ekawa, M. Takechi, Y. Igarashi, Branislav Sitar, Helmut Weick, V. Metag, V. Drozd, Nasser Kalantar-Nayestanaki, Y. Ma, S. Bagchi, M. Iwasaki, N. Kurz, Daisuke Jido, Hans Geissel, S. Minami, D. Kostyleva, Bettina Lommel, R. Ruber, Imrich Szarka, C. Rappold, Herbert A. Simon, K. Itahashi, R. Sekiya, M. Nakagawa, V. Serdyuk, S. Pietri, J. Benlliure, Tomofumi Nagae, A. Prochazka, Paweł Moskal, Hooi Jin Ong, S.Y. Matsumoto, A. Yamamoto, Energy and Sustainability Research Institute Groni, and Research unit Nuclear & Hadron Physics

Subjects
Physics, History, Proton, Detector, Nuclear Theory, Coincidence, Computer Science Applications, Education, Event selection, Nuclear physics, Subatomär fysik, Deuterium, Subatomic Physics, ddc:530, High Energy Physics::Experiment, Spectroscopy, Nuclear Experiment, Beam (structure)
Abstract

Journal of physics / Conference series 1643, 012181 (2020). doi:10.1088/1742-6596/1643/1/012181, Published by IOP Publ., Bristol

Published
2020

7. Search for elements 119 and 120

Author

Michael Block, Mahananda Dasgupta, S. Minami, Susanta Lahiri, M. Wegrzecki, N. Kurz, Rose A. Boll, Andreas Türler, J. V. Kratz, R-D Herzberg, Daniel Cox, James B. Roberto, Claes Fahlander, Jadambaa Khuyagbaatar, Dirk Rudolph, K. P. Rykaczewski, A. Hübner, G. K. Pang, K. Miernik, N. Gharibyan, B. Schausten, J. Hoffmann, L.-L. Andersson, Bettina Lommel, Luis Sarmiento, U. Forsberg, Matthias Schädel, J. H. Hamilton, Juha Uusitalo, Kenneth E. Gregorich, Heino Nitsche, H. Brand, Julia Even, Moumita Maiti, J. M. Gates, David Hinde, Philippos Papadakis, M. Laatiaoui, Norbert Wiehl, Klaus Eberhardt, W. Hartmann, J. Runke, D. A. Shaughnessy, Dieter Ackermann, Petra Thörle-Pospiech, K. Tinschert, R. Lang, C. Mokry, Birgit Kindler, Jon Petter Omtvedt, Ch. E. Düllmann, S. M. Van Cleve, J. Steiner, D. Renisch, A. K. Mistry, M. Asai, Maurits Evers, Alexander Yakushev, Patrick Steinegger, A. Semchenkov, Pavel Golubev, V. Yakusheva, X. Derkx, Evgeny E. Tereshatov, J. Krier, Norbert Trautmann, T. Torres De Heidenreich, A. Di Nitto, F. P. Heßberger, R. Hollinger, Egon Jäger, Khuyagbaatar, J., Yakushev, A., Düllmann, Ch. E., Ackermann, D., Andersson, L. -L., Asai, M., Block, M., Boll, R. A., Brand, H., Cox, D. M., Dasgupta, M., Derkx, X., Di Nitto, A., Eberhardt, K., Even, J., Evers, M., Fahlander, C., Forsberg, U., Gates, J. M., Gharibyan, N., Golubev, P., Gregorich, K. E., Hamilton, J. H., Hartmann, W., Herzberg, R. -D., Heßberger, F. P., Hinde, D. J., Hoffmann, J., Hollinger, R., Hübner, A., Jäger, E., Kindler, B., Kratz, J. V., Krier, J., Kurz, N., Laatiaoui, M., Lahiri, S., Lang, R., Lommel, B., Maiti, M., Miernik, K., Minami, S., Mistry, A. K., Mokry, C., Nitsche, H., Omtvedt, J. P., Pang, G. K., Papadakis, P., Renisch, D., Roberto, J. B., Rudolph, D., Runke, J., Rykaczewski, K. P., Sarmiento, L. G., Schädel, M., Schausten, B., Semchenkov, A., Shaughnessy, D. A., Steinegger, P., Steiner, J., Tereshatov, E. E., Thörle-Pospiech, P., Tinschert, K., Torres De Heidenreich, T., Trautmann, N., Türler, A., Uusitalo, J., Wegrzecki, M., Wiehl, N., Van Cleve, S. M., Yakusheva, V., and Van Swinderen Institute for Particle Physics and G

Subjects
Physics, element 119, 010308 nuclear & particles physics, element 120, Superheavy Elements, 01 natural sciences, Island of stability, Recoil separator, Nuclear physics, superheavy elements, Production cross section, Subatomic Physics, 0103 physical sciences, 540 Chemistry, 570 Life sciences, biology, low and intermediate energy heavy-ion reactions, Atomic number, Irradiation, Sensitivity (control systems), ydinfysiikka, 010306 general physics, Beam energy
Abstract

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

Published
2020

8. Spectroscopic Tools Applied to Flerovium Decay Chains

Author

Nikolaus Kurz, Petra Thörle-Pospiech, H. Schaffner, Alexander Yakushev, S. Götz, J. Heery, Daniel Cox, J. Runke, Claes Fahlander, C.-C. Meyer, A. K. Mistry, Bettina Lommel, J. L. Pore, R. M. Clark, Norbert Trautmann, A. Såmark-Roth, F. Giacoppo, Ch. E. Düllmann, C. Mokry, J. M. Gates, Dirk Rudolph, B. Schausten, Luis Sarmiento, L. Lens, Juha Uusitalo, J. Krier, Jadambaa Khuyagbaatar, M. Götz, J. Eberth, U. Forsberg, Michael Block, I. Kojouharov, R-D Herzberg, Egon Jäger, H. M. Albers, Birgit Kindler, Pavel Golubev, Philippos Papadakis, H. Brand, and J. V. Kratz

Subjects
History, alpha decay, spektroskopia, tutkimuslaitteet, chemistry.chemical_element, 01 natural sciences, Recoil separator, Education, Nuclear physics, 0103 physical sciences, Subatomic Physics, ddc:530, Sensitivity (control systems), 010306 general physics, Physics, nuclear spectroscopy, 010308 nuclear & particles physics, Detector, 3. Good health, Computer Science Applications, Flerovium, superheavy elements, chemistry, Nuclear spectroscopy, Alpha decay, Decay chain, Deconvolution, ydinfysiikka
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

9. Surface and thickness measurement in the Targetlab of GSI

Author

A. Hübner, Bettina Lommel, Birgit Kindler, J. Steiner, V. Yakusheva, and Elif Celik Ayik

Subjects
Surface (mathematics), Optics, Materials science, business.industry, Measuring principle, Physics, QC1-999, business, Characterization (materials science), Total thickness
Abstract

For characterization of targets and foils prepared at the target laboratory as well as for characterization of e.g. degrader or windows of internal customers, different analytical devices are available. Besides a lot of standard equipment, the target laboratory of GSI holds a 3D-measurement system (MicroProf®) equipped with optical sensors for measuring surface parameters as well as total thickness variations contact-free. In the paper the measuring principle including the possibilities and features of the MicroProf®-system are explained and some different applications are shown.

Published
2020

10. Isomeric States in $^{255}$Rf, $^{256}$Rf and $^{257}$Rf

Author

B. Andel, Birgit Kindler, S. Antalic, M. Vostinar, Z. Kalaninová, Bettina Lommel, Michael Block, A. K. Mistry, M. Laatiaoui, J. Piot, P. Mosat, Dieter Ackermann, F. P. Heßberger, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, business.industry, 0103 physical sciences, General Physics and Astronomy, Optoelectronics, ddc:530, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, business, 01 natural sciences, 3. Good health
Abstract

International audience; In this work, we present results from the investigations of high-K isomers in 255Rf, 256Rf and 257Rf isotopes produced in 50Ti+207Pb and 50Ti+208Pb reactions. The method of time and position correlation search was used to identify ER–CE–α/SF events in the data. Previously known high-K states in 256Rf and 257Rf were confirmed. A search for high-K isomer in 255Rf was performed for the first time. Observation of ER–CE correlations with a lifetime of ≈ 30 µs indicates the presence of isomeric states also in this isotope.

Published
2019

11. Spontaneous fission of rutherfordium isotopes - total kinetic energies

Author

Mustapha Laatiaoui, Katsuhisa Nishio, Bettina Lommel, J. Piot, F. P. Heßberger, Birgit Kindler, Dieter Ackermann, B. Andel, Pavol Mosat, Michael Block, S. Antalic, B. Sulignano, Sigurd Hofmann, Zdenka Kalaninova, A. K. Mistry, Marija Vostinar, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Département de Physique Nucléaire (ex SPhN) (DPHN), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, DeAngelis, G, Corradi, L, and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Isotope, 010308 nuclear & particles physics, QC1-999, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, Nuclear physics, chemistry, Filter (video), 0103 physical sciences, Rutherfordium, 010306 general physics, Spontaneous fission
Abstract

The isotopes 255,256,258Rf were produced in the fusion-evaporation reactions 50Ti + 207,208Pb and 50Ti + 209Bi at GSI Darmstadt, using the velocity filter SHIP. Total kinetic energies of fragments from spontaneous fission for these isotopes were evaluated with a correction to pulse-height defect.

Published
2019

12. Total Kinetic Energy Measurements for Spontaneous Fission of $^{255,\,256,\,258}$Rf

Author

Z. Kalaninová, M. Vostinar, Dieter Ackermann, B. Sulignano, J. Piot, A. K. Mistry, Birgit Kindler, Michael Block, Stefan G. Hofmann, S. Antalic, I. Kojouharov, B. Andel, F. P. Heßberger, M. Laatiaoui, Katsuhisa Nishio, Bettina Lommel, P. Mošať, Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Evaporation, General Physics and Astronomy, Focal plane detector, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, 0103 physical sciences, Silicon detector, Atomic physics, 010306 general physics, Spontaneous fission
Abstract

International audience; Spontaneous fission of 255Rf, 256Rf and 258Rf was studied at SHIP in GSI Darmstadt. The isotopes were produced in fusion–evaporation reactions 50Ti + 207,208Pb and 50Ti + 209Bi (compound nuclei 257Rf, 258Rf and 259Db, respectively) and implanted into the focal plane detector of the SHIP setup. The deficit in the measured fragments energies was evaluated as a function of implantation depth of evaporation residues in the silicon detector. This correction was applied to obtain the mean total kinetic energies of 255Rf, 256Rf and 258Rf.

Published
2017

13. Remarks on the Fission Barriers of SHN and Search for Element 120

Author

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

Subjects
Nuclear physics, Physics, fissio, ydinreaktiot, ta114, fission barriers, Fission, super-heavy nuclei, Element (category theory), fysiikka, cross-sections
Published
2017

14. Gas phase chemistry of superheavy elements coupled to an electromagnetic separator

Author

L. J. Harkness-Brennan, F. P. Heβberger, Tetsuya Sato, L. Lens, U. Forsberg, Dirk Rudolph, J. Krier, A. Hübner, Norbert Trautmann, M. Wegrzecki, D. S. Judson, Alexander Yakushev, M. Götz, Petra Thörle-Pospiech, J. V. Kratz, S. Götz, D. A. Shaughnessy, Paul Scharrer, Helena May David, Birgit Kindler, Matthias Schädel, Ken Moody, Ch. Lorentz, Philippos Papadakis, J. Khuyagbaatar, Jörg Runke, J. Konki, R.-D. Herzberg, V. Yakusheva, A. Ward, Pavel Golubev, John D. Despotopulos, Susanta Lahiri, J. Steiner, A. K. Mistry, E. Williams, Klaus Eberhardt, Valeria Pershina, Ch. E. Düllmann, A. Di Nitto, Egon Jäger, Bettina Lommel, Moumita Maiti, Kazuaki Tsukada, M. Asai, Yuichiro Nagame, B. Schausten, Luis Sarmiento, Juha Uusitalo, Mustapha Laatiaoui, David Hinde, N. Kurz, Norbert Wiehl, J. Hoffmann, Michael Block, J. P. Omtvedt, Hiromitsu Haba, Yukiko Komori, and C. Mokry

Subjects
Nuclear physics, superheavy elements, ydinreaktiot, ta114, Chemistry, electromagnetic separator, gas phase chemistry, Superheavy Elements, Atomic physics, fysiikka, Separator (electricity), Gas phase
Published
2017

15. Towards saturation of the electron-capture delayed fission probability: The new isotopes $^{240}Es$ and $^{236}Bk$

Author

Rauno Julin, J. Khuyagbaatar, Bettina Lommel, Juha Sorri, Kalle Auranen, R. Briselet, Philippos Papadakis, R-D Herzberg, Paul Greenlees, K. Hauschild, Pauli Peura, J. Krier, Katsuhisa Nishio, Panu Rahkila, S. Juutinen, Sanna Stolze, Joonas Konki, B. Sulignano, Michael Block, Egon Jäger, Ch. Theisen, Mahananda Dasgupta, Alexander Yakushev, Tuomas Grahn, M. J. Mallaburn, Jari Partanen, K. Rezynkina, Janne Pakarinen, A. Ward, Andrej Herzan, Duc Huy Luong, Mikael Sandzelius, David Hinde, V. Yakusheva, Panu Ruotsalainen, Juha Uusitalo, Daniel Cox, A. Di Nitto, Jan Sarén, H. Badran, Ch. E. Düllmann, Birgit Kindler, F. P. Heßberger, A. Lopez-Martens, Matti Leino, C. Scholey, Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Konki, J., Khuyagbaatar, J., Uusitalo, J., Greenlees, P. T., Auranen, K., Badran, H., Block, M., Briselet, R., Cox, D. M., Dasgupta, M., Di Nitto, A., Dullmann, C. E., Grahn, T., Hauschild, K., Herzan, A., Herzberg, R. -D., Hessberger, F. P., Hinde, D. J., Julin, R., Juutinen, S., Jager, E., Kindler, B., Krier, J., Leino, M., Lommel, B., Lopez-Martens, A., Luong, D. H., Mallaburn, M., Nishio, K., Pakarinen, J., Papadakis, P., Partanen, J., Peura, P., Rahkila, P., Rezynkina, K., Ruotsalainen, P., Sandzelius, M., Saren, J., Scholey, C., Sorri, J., Stolze, S., Sulignano, B., Theisen, C., Ward, A., Yakushev, A., and Yakusheva, V.

Subjects
Electron-capture delayed fission, Nuclear and High Energy Physics, Electron capture, Fission, Fusion–evaporation reaction, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 236 Bk, 01 natural sciences, 7. Clean energy, Recoil separator, Nuclear physics, fusion-evaporation reactions, 236Bk, 240Es, 240 Es, 0103 physical sciences, ddc:530, 010306 general physics, α decay, isotopes, Physics, Isotope, ta114, Isotopes with mass 236–240, 010308 nuclear & particles physics, lcsh:QC1-999, Exponential function, Bk, mass, Atomic physics, Saturation (chemistry), Fusion–evaporation reactions, α particles, lcsh:Physics, Radioactive decay
Abstract

The new neutron-deficient nuclei 240 Es and 236 Bk were synthesised at the gas-filled recoil separator RITU. They were identified by their radioactive decay chains starting from 240 Es produced in the fusion–evaporation reaction 209 Bi( 34 S,3n) 240 Es. Half-lives of 6 ( 2 ) s and 22 − 6 + 13 s were obtained for 240 Es and 236 Bk, respectively. Two groups of α particles with energies E α = 8.19 ( 3 ) MeV and 8.09 ( 3 ) MeV were unambiguously assigned to 240 Es. Electron-capture delayed fission branches with probabilities of 0.16 ( 6 ) and 0.04 ( 2 ) were measured for 240 Es and 236 Bk, respectively. These new data show a continuation of the exponential increase of ECDF probabilities in more neutron-deficient isotopes.

Published
2017

16. Investigation of electron capture decay of $^{258}$Db and α decay of $^{258}$Rf

Author

I. Kojouharov, Michael Block, Dieter Ackermann, A. K. Mistry, S. Antalic, B. Andel, J. Piot, Z. Kalaninová, M. Laatiaoui, Birgit Kindler, Bettina Lommel, F. P. Heßberger, M. Vostinar, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Branching fraction, Electron capture, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, Internal conversion, 0103 physical sciences, Alpha decay, Decay product, Atomic physics, 010306 general physics, Radioactive decay, Spontaneous fission
Abstract

Electron capture decay of 258 Db was measured directly via delayed coincidences between K X-rays and/or conversion electrons (from the electron capture decay), and spontaneous fission or \(\alpha\) decay of the daughter nuclide 258Rf. Delayed K X-rays were also measured in prompt coincidence with conversion electrons, showing that electron capture decay also populates excited levels in the daughter nucleus. Our data indicate electron capture decay from two states in 258Db, thus supporting the existence of two long-lived states in 258Db with some seconds half-life already known from \( \alpha\)-decay studies. The analysis of correlations between photons, conversion electrons and fission events resulted in a strong evidence for population of two isomeric states in 258Rf by the electron capture decay of 258Db, with half-lives of \(T_{1/2} = (15 \pm 10)\) μs and \(T_{1/2} = (2.4^{+2.4}_{-0.8})\) ms. A previously reported \(\alpha\) branch of 258Rf was confirmed. However, we obtained a significantly lower branching ratio \( b_{\alpha} = (0.049 \pm 0.016)\). The technique is discussed as a possible new method for Z-identification of odd-odd superheavy nuclei.

Published
2016

17. Alpha- and EC-decay measurements of $^{257}$Rf

Author

M. Vostinar, I. Kojouharov, M. Laatiaoui, Dieter Ackermann, Z. Kalaninová, A. K. Mistry, Bettina Lommel, F. P. Heßberger, S. Antalic, Birgit Kindler, B. Andel, J. Piot, Michael Block, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)

Subjects
Physics, Nuclear and High Energy Physics, Particle and Nuclear Physics, Nuclear Fusion, 010308 nuclear & particles physics, Electron capture, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Electron, Hadrons, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], equipment and supplies, 01 natural sciences, Nuclear physics, 0103 physical sciences, Nuclear fusion, Heavy Ions, Atomic physics, Decay product, 010306 general physics, Nuclear Physics
Abstract

Alpha- and Electron capture (EC) decay properties of 257 Rf were investigated by measuring $ \alpha$ - $ \gamma$ coincidences and correlations between conversion electrons (CE) emitted during the process of EC decay of 257Rf and $ \alpha$ decays of the daughter isotope 257Lr. So far, previously unobserved $ \alpha$ (8296 keV)- $ \gamma$ (557 keV) coincidences were measured and interpreted as decays of 257mRf ( $ 11/2^{-}[725]$ into the $ 7/2^{-}[743]$ level in 253No. A search of delayed coincidences between $ \alpha$ particles and signals at $ E \le 1000$ keV, which are interpreted as being due to CE emission, revealed a clear correlation between CE and $ \alpha$ particles from the decay of 257Lr, which is regarded as a direct proof of the EC decay of 257gRf and 257mRf.

Published
2016

18. Mass-asymmetric fission in the 40ca+142Nd reaction

Author

J. Khuyagbaatar, Elizabeth Williams, Kaitlin Cook, Cedric Simenel, Duc Huy Luong, Aditya Wakhle, Mahananda Dasgupta, K. Ramachandran, S. D. McNeil, Ian Carter, D. C. Rafferty, Bettina Lommel, E. Prasad, David Hinde, Ch. E. Düllmann, Birgit Kindler, C. S. Palshetkar, and D. Y. Jeung

Subjects
Cold fission, Cluster decay, 010308 nuclear & particles physics, Neutron emission, Chemistry, Fission, Isotopes of samarium, Physics, QC1-999, Nuclear Theory, Fission product yield, 01 natural sciences, 0103 physical sciences, Physics::Atomic and Molecular Clusters, Neutron, Atomic physics, 010306 general physics, Nuclear Experiment, Spontaneous fission
Abstract

Shell effects play a major role in fission. Mass-asymmetric fission observed in the spontaneous and low energy fission of actinide nuclei was explained by incorporating the fragment shell properties in liquid drop model. Asymmetric fission has also been observed in the low energy fission of neutron-deficient 180 Hg nuclei in recent β -delayed fission experiments. This low-energy β -delayed fission has been explained in terms of strong shell effects in pre-scission configurations associated with the system after capture. Calculations predicted asymmetric fission for heavier Hg isotopes as well, at compound nuclear excitation energy as high as 40 MeV. To explore the evolution of fission fragment mass distribution as a function of neutron and proton numbers and also with excitation energy, fission fragment mass distributions have been measured for the 40 Ca+ 142 Nd reaction forming the compound nucleus 182 Hg at energies around the capture barrier, using the Heavy Ion Accelerator Facility and CUBE spectrometer at the Australian National University. Mass-asymmetric fission is observed in this reaction at an excitation energy of 33.6 MeV. The results are consistent with the β -delayed fission measurements and indicate the presence of shell effects even at higher exciation energies.

Published
2016

19. Decomposition studies of group 6 hexacarbonyl complexes. Part 1: Production and decomposition of Mo(CO)6 and W(CO)6

Author

Alexander Yakushev, Patrick Steinegger, Andreas Türler, Daiya Kaji, K. Morimoto, S. Yamaki, Zhiyong Qin, J. Kanaya, Minghui Huang, I. Usoltsev, Mirei Takeyama, Tetsuya Sato, Y. Nagame, K. Tanaka, Hiromitsu Haba, H. Brand, N. Kurz, Takayuki Sumita, Matthias Schädel, Kosuke Morita, Kazuaki Tsukada, Masashi Murakami, J. Krier, Egon Jäger, Sunao Miyashita, Atsushi Toyoshima, J. V. Kratz, Y. Kaneya, F. Fangli, Birgit Kindler, Y. Kudou, A. Di Nitto, Robert Eichler, Jadambaa Khuyagbaatar, Yuezhao Wang, Norbert Wiehl, Julia Even, Yasuo Wakabayashi, Bettina Lommel, W. Hartmann, J. Steiner, M. Asai, Heino Nitsche, Ch. E. Düllmann, Kazuhiro Ooe, Usoltsev, I., Eichler, R., Wang, Y., Even, J., Yakushev, A., Haba, H., Asai, M., Brand, H., Di Nitto, A., Dullmann, C. E., Fangli, F., Hartmann, W., Huang, M., Jager, 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., Sato, T. K., Schadel, M., Steiner, J., Steinegger, P., Sumita, T., Takeyama, M., Tanaka, K., Toyoshima, A., Tsukada, K., Turler, A., Wakabayashi, Y., Wiehl, N., Yamaki, S., and Qin, Z.

Subjects
Inorganic chemistry, Metal carbonyl, 02 engineering and technology, 010402 general chemistry, 01 natural sciences, 7. Clean energy, thermal stability, 540 Chemistry, seaborgium, Thermal stability, Nuclide, Gas composition, Physical and Theoretical Chemistry, carbonyl complexe, group 6, Chemistry, transactinide, Transition metals, 021001 nanoscience & nanotechnology, Decomposition, Bond-dissociation energy, 0104 chemical sciences, Volumetric flow rate, Yield (chemistry), 570 Life sciences, biology, Physical chemistry, 0210 nano-technology
Abstract

Chemical studies of superheavy elements require fast and efficient techniques, due to short half-lives and low production rates of the investigated nuclides. Here, we advocate for using a tubular flow reactor for assessing the thermal stability of the Sg carbonyl complex – Sg(CO)6. The experimental setup was tested with Mo and W carbonyl complexes, as their properties are established and supported by theoretical predictions. The suggested approach proved to be effective in discriminating between the thermal stabilities of Mo(CO)6 and W(CO)6. Therefore, an experimental verification of the predicted Sg–CO bond dissociation energy seems to be feasible by applying this technique. By investigating the effect of 104,105Mo beta-decay on the formation of 104,105Tc carbonyl complex, we estimated the lower reaction time limit for the metal carbonyl synthesis in the gas phase to be more than 100 ms. We examined further the influence of the wall material of the recoil chamber, the carrier gas composition, the gas flow rate, and the pressure on the production yield of 104Mo(CO)6, so that the future stability tests with Sg(CO)6 can be optimized accordingly.

Published
2016

20. Nuclear structure studies in the seaborgium region at SHIP

Author

F. P. Heßberger, M. Laatiaoui, Dieter Ackermann, J. Piot, B. Andel, Stefan G. Hofmann, M. Vostinar, Birgit Kindler, J. Khuyagbaatar, S. Heinz, S. Antalic, Bettina Lommel, Z. Kalaninová, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Neutron emission, Nuclear structure, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, chemistry, Seaborgium, 0103 physical sciences, Nuclear fusion, Neutron, Alpha decay, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract

International audience; New decay data for the isotopes 259Sg and 255Rf were obtained at the velocity filter SHIP using an α-decay spectroscopymeasurement. Both isotopes were produced and studied via a one neutron evaporation channel in the compound fusion reaction54Cr+208Pb. New isomeric states were observed and the single-particle level systematics for isotones with 151 and 153 neutronswere extended. A change of the ground-state configuration for the heaviest N = 151 isotones was observed. Detailed Monte-Carlosimulation for the α decay of 259Sg applying the Geant4 toolkit was performed and compared with experimental data.

Published
2015

21. On the synthesis of neutron-rich isotopes along the N = 126 shell in multinucleon transfer reactions

Author

Sigurd Hofmann, J. Maurer, R. Mann, V. F. Comas, V. Zagrebaev, R. Knöbel, S. Heinz, Bettina Lommel, Birgit Kindler, C. Heinz, O. Beliuskina, Dieter Ackermann, M. Stahl, and F. P. Heßberger

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Nuclear Theory, Hadron, Coulomb barrier, Nuclear physics, Fragmentation (mass spectrometry), Nuclear fusion, Neutron, Atomic physics, Nuclear Experiment, Nucleon
Abstract

We performed experimental and theoretical studies of deep inelastic multinucleon transfer reactions in heavy-ion collisions at Coulomb barrier energies. Our goal was to investigate if deep inelastic transfer is superior to fragmentation reactions for producing neutron-rich isotopes in the astrophysically interesting region along the closed neutron shell N = 126 . Here, we will present our results obtained in reactions of 64Ni + 207Pb at 5.0 MeV/nucleon. The experiment was performed at the velocity filter SHIP at GSI Darmstadt. Several transfer products on the neutron-rich side were populated but new isotopes were not observed. A comparison of the measured transfer cross-sections and production yields with those from fragmentation reactions allowed for interesting conclusions.

Published
2015
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22. Alpha-Photon Coincidence Spectroscopy Along Element 115 Decay Chains

Author

Dieter Ackermann, Petra Thörle-Pospiech, H. Schaffner, Julia Even, Jon Petter Omtvedt, Ch. E. Düllmann, T. Traut, Alexander Yakushev, Philippos Papadakis, I. Kojouharov, Claes Fahlander, Klaus Eberhardt, J.M. Gates, K. Rykaczewski, Pavel Golubev, F. P. Heßberger, Sven Åberg, J. Krier, J. V. Kratz, J. Gerl, A. K. Mistry, Andreas Türler, Michael Block, R-D Herzberg, C. J. Gross, T. Torres, Egon Jäger, Matthias Schädel, B. Schausten, X. Derkx, K.E. Gregorich, Birgit Kindler, Norbert Wiehl, Luis Sarmiento, J. Runke, Ingemar Ragnarsson, A. Di Nitto, H. Brand, Daniel Cox, B. G. Carlsson, Norbert Trautmann, A. Ward, Daniel Ward, Jadambaa Khuyagbaatar, C. Mokry, Heino Nitsche, U. Forsberg, Nikolaus Kurz, L.-L. Andersson, Dirk Rudolph, Bettina Lommel, Rudolph, D., Forsberg, U., Golubev, P., Sarmiento, L. G., Yakushev, A., Andersson, L. -L., Di Nitto, A., Dullmann, Ch. E., Gates, J. M., Gregorich, K. E., Gross, C. J., Herzberg, R. -D., Hessbberger, F. P., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Schadel, M., Aberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jager, 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., Thorle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Turler, A., Ward, D. E., and Wiehl, N.

Subjects
Physics, element 115, Photon, Isotope, alpha decay, General Physics and Astronomy, 7. Clean energy, Nuclear & Particles Physics, Coincidence, Charged particle, Mathematical Sciences, Nuclear physics, superheavy elements, gamma-ray spectroscopy, Subatomic Physics, Physical Sciences, Gamma spectroscopy, ddc:530, Alpha decay, Decay chain, Atomic physics, Spectroscopy
Abstract

Produced in the reaction 48Ca+243Am, thirty correlated α-decay chains were observed in an experiment conducted at the GSI Helmholzzentrum fur 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

23. Spectroscopy of Element 115 Decay Chains

Author

Sven Åberg, A. K. Mistry, I. Kojouharov, Bettina Lommel, Birgit Kindler, A. Ward, T. Traut, Alexander Yakushev, Klaus Eberhardt, Norbert Wiehl, K. P. Rykaczewski, Dirk Rudolph, Claes Fahlander, Michael Block, Daniel Cox, Andreas Türler, Heino Nitsche, C. J. Gross, L.-L. Andersson, R-D Herzberg, Jon Petter Omtvedt, J. Runke, Dieter Ackermann, J. V. Kratz, Daniel Ward, Petra Thörle-Pospiech, J. Krier, Nikolaus Kurz, H. Schaffner, T. Torres, K. E. Gregorich, J. M. Gates, H. Brand, Norbert Trautmann, Matthias Schädel, Ingemar Ragnarsson, B. G. Carlsson, Ch. E. Düllmann, Philippos Papadakis, F. P. Heßberger, C. Mokry, Pavel Golubev, Julia Even, U. Forsberg, B. Schausten, Luis Sarmiento, Egon Jäger, X. Derkx, J. Gerl, A. Di Nitto, Jadambaa Khuyagbaatar, Rudolph, D., Forsberg, U., Golubev, P., Sarmiento, L. G., Yakushev, A., Andersson, L. -L., Di Nitto, A., Dullmann, C. E., Gates, J. M., Gregorich, K. E., Gross, C. J., Hessberger, F. P., Herzberg, R. -D., Khuyagbaatar, J., Kratz, J. V., Rykaczewski, K., Schadel, M., Aberg, S., Ackermann, D., Block, M., Brand, H., Carlsson, B. G., Cox, D., Derkx, X., Eberhardt, K., Even, J., Fahlander, C., Gerl, J., Jager, 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., Thorle-Pospiech, P., Torres, T., Traut, T., Trautmann, N., Turler, A., Ward, A., Ward, D. E., and Wiehl, N.

Subjects
Physics, Isotope, 010308 nuclear & particles physics, Nuclear structure, General Physics and Astronomy, 01 natural sciences, Coincidence, 540 Chemistry, 0103 physical sciences, Physical Sciences, Subatomic Physics, ddc:550, 570 Life sciences, biology, Alpha decay, Decay chain, Atomic physics, Element (category theory), 010306 general physics, Spectroscopy, Excitation
Abstract

A high-resolution , X-ray and gamma-ray coincidence spectroscopy experiment was conducted at the GSI Helmholtzzentrum für Schwerionenforschung. Thirty correlated alpha-decay chains were detected following the fusion-evaporation reaction 48Ca + 243Am. The observations are consistent with previous assignments of similar decay chains to originate from element Z = 115. For the first time, precise spectroscopy allows the derivation of excitation schemes of isotopes along the decay chains starting with elements Z > 112. Comprehensive Monte-Carlo simulations accompany the data analysis. Nuclear structure models provide a first level interpretation.

Published
2013

24. Investigation of fission properties and evaporation residue measurement in the reactions using 238U target nucleus

Author

S. Mitsuoka, Kouichi Hagino, Tsutomu Ohtsuki, Sigurd Hofmann, J. A. Heredia, S. Saro, I. Kojouharov, Yasuo Wakabayashi, Bettina Lommel, Y. Nagame, Ch. E. Düllmann, V. F. Comas, Kentaro Hirose, J. Khuyagbaatar, R. Mann, Birgit Kindler, S. Heinz, S. Antalic, A. V. Yeremin, Katsuhisa Nishio, Ichiro Nishinaka, H. Ikezoe, Yoshihiro Aritomo, Matthias Schädel, Dieter Ackermann, Andreas Türler, Alexander Yakushev, A. V. Gorshkov, Hiroyuki Makii, Y. X. Watanabe, A. G. Popeko, and R. Graeger

Subjects
Physics, Fusion, Chemical substance, Mass distribution, Fission, QC1-999, Momentum transfer, Coulomb barrier, Langevin equation, medicine.anatomical_structure, medicine, Atomic physics, Nucleus
Abstract

Fragment mass distributions for fission after full momentum transfer were measured in the reactions of 30 Si,34,36 S,31 P,40 Ar + 238 U at bombarding energies around the Coulomb barrier. Mass distributions change significantly as a function of incident beam energy. The asymmetric fission probability increases at sub-barrier energy. The phenomenon is interpreted as an enhanced quasifission probability owing to orientation effects on fusion and/or quasifission. The evaporation residue (ER) cross sections were measured in the reactions of 30 Si + 238 U and 34 S + 238 U to obtain information on fusion. In the latter reaction, significant suppression of fusion was implied. This suggests that fission events different from compound nucleus are included in the masssymmetric fragments. The results are supported by a model calculation based on a dynamical calculation using Langevin equation, in which the mass distribution for fusion-fission and quasifission fragments are separately determined.

Published
2011

25. The new isotope 179Pb and alpha-decay properties of 179Tlm

Author

R. Mann, Birgit Kindler, J. Elseviers, Sigurd Hofmann, J. A. Heredia, I. Kojouharov, R. D. Page, P. J. Sapple, F. P. Heßberger, Thomas Elias Cocolios, Sami Rinta-Antila, Marc Huyse, P. Van Duppen, S. Heinz, S. Antalic, S. Franchoo, V. F. Comas, S. Saro, Dieter Ackermann, J. Khuyagbaatar, H. V. Watkins, M. Venhart, Andrei Andreyev, Bettina Lommel, Institut de Physique Nucléaire d'Orsay (IPNO), and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Isotope, 010308 nuclear & particles physics, Half-life, Parity (physics), 01 natural sciences, 7. Clean energy, Nuclear physics, Recoil, 0103 physical sciences, Nuclear fusion, Alpha decay, Atomic physics, 010306 general physics, Ground state
Abstract

The new isotope 179Pb has been produced in the complete fusion reaction 40Ca+144Sm->179Pb+5n at the velocity filter SHIP (GSI). Its alpha-decay energy of 7350(20) keV and half-life value 3.5 (+1.4/-0.8) ms were deduced based on the recoil-alpha-alpha correlation technique. A spin parity of I=(9/2-) was tentatively assigned to the ground state of 179Pb; thus, it is based on the 1h9/2 orbital. Improved measurements of the alpha-decay properties of 179Tlm and 175Aum are also presented. ispartof: Journal of Physics G, Nuclear and Particle Physics vol:37 issue:3 status: published

Published
2010

26. Study of heavy di-nuclear systems

Author

Dieter Ackermann, W. Mittig, V. F. Comas, J. A. Heredia, S. Heinz, Jadambaa Khuyagbaatar, S. Hofmann, Antonio Villari, C. Golabek, F. P. Heßberger, R. Mann, Bettina Lommel, Birgit Kindler, F. Rejmund, Helmholtz zentrum für Schwerionenforschung GmbH (GSI), Grand Accélérateur National d'Ions Lourds (GANIL), Centre National de la Recherche Scientifique (CNRS)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, SHELL model, Dissipation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Atomic physics, 010306 general physics, Nucleon, Beam (structure)
Abstract

We investigated di-nuclear system formation with successive nucleon transfer at beam energies at and below the barrier in the superheavy systems 64 28 Ni + 207 82 Pb ( Z p r o j . + Z t a r g e t = 110 ) and 238 92 U + 238 92 U ( Z p r o j . + Z t a r g e t = 184 ). In both collision systems we observed a massive transfer of nucleons correlated with the dissipation of the entire kinetic energy. The results are in accordance with the two-center shell model which assumes the formation of a di-nuclear system as first step to fusion. The experiments have been performed at the velocity filter SHIP (GSI) and at the VAMOS spectrometer (GANIL).

Published
2009

27. Measurement of evaporation residue cross-sections of the reaction 30Si + 238U at subbarrier energies

Author

H. J. Schött, B. Sulignano, S. Hofmann, V. F. Comas, Tsutomu Ohtsuki, S. Saro, I. Kojouharov, J. A. Heredia, Pasi Kuusiniemi, H. Ikezoe, A. I. Svirikhin, Katsuhisa Nishio, A. G. Popeko, Bettina Lommel, S. Mitsuoka, Jadambaa Khuyagbaatar, Kazuaki Tsukada, Y. Nagame, K. Tsuruta, S. Heinz, A. V. Yeremin, M. Mazzocco, Zaiguo Gan, Birgit Kindler, S. Antalic, F. P. Heßberger, and Dieter Ackermann

Subjects
Fusion, Isotope, Chemistry, Coulomb barrier, Neutron, Decay chain, Alpha decay, Atomic physics, Excitation, Spontaneous fission
Abstract

The reaction 30Si + 238U → 268Sg* was studied at beam energies close to the Coulomb barrier. At the above barrier energy of Ec.m. = 144.0 MeV (center‐of‐mass energy at half thickness of the target), we measured three decay chains of 263Sg produced by evaporation of five neutrons. The cross‐section was (67−37+67) pb. At subbarrier energy of Ec.m. = 133.0 MeV we measured three spontaneously fissioning nuclei which we assigned to the isotope 264Sg. The half‐life of (120−44+126) ms was determined. The production cross‐section was (10−6+10) pb, which is about four orders magnitude larger than the calculation based on the one‐dimensional barrier penetration model in the fusion process, showing fusion enhancement caused by the prolate deformation of 238U. At Ec.m. = 128.0 MeV an upper cross‐section limit of 15 pb was measured. Compared to excitation functions measured for the lighter system 16O + 238U → 254Fm*, a reduction of the fusion probability was observed at low beam energies indicating increasing competition from quasifission processes.

Published
2007

28. The Super-FRS Project at GSI

Author

Bernhard Franczak, Björn Jonson, K.-H. Schmidt, J. Kojouharova, W. Mittig, R. Gernhäuser, M. Winkler, Hans Geissel, Helmut Weick, K. Sümmerer, K. Burkard, J. Friese, R. Kulessa, Mikhail I. Yavor, G. Moritz, H. Emling, Margareta Hellström, M. Böhmer, Thomas Aumann, G. Münzenberg, Naeem A. Tahir, Jerry Nolen, Al Zeller, B. M. Sherrill, P. Roussell-Chomaz, V. Chichkine, D. Cortina-Gil, G. Schrieder, A. Dael, C. Mühle, Gunnar Nyman, Birgit Kindler, Bettina Lommel, N. Kurz, Herbert A. Simon, J. Gerl, K.-H. Behr, J. Benlliure, A. Brünle, J.-E. Ducret, B. Gastineau, Hermann Wollnik, L. V. Chulkov, V.S. Vysotsky, C. Scheidenberger, Grand Accélérateur National d'Ions Lourds (GANIL), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and Lion, Michel

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Projectile, Scattering, Nuclear structure, Superconducting magnetic energy storage, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], XX, Charged particle, Nuclear physics, Nuclear Experiment, Instrumentation, Electron scattering, Storage ring
Abstract

The GSI projectile fragment separator FRS has demonstrated with many pioneering experiments the research potential of in-flight separators at relativistic energies. Although the present facility has contributed much to the progress in the field of nuclear structure physics, major improvements are desirable in the future. The characteristics of the proposed next-generation facility at GSI, the Super-FRS, will be presented and compared to other projects. The Super-FRS is a large-acceptance superconducting fragment separator followed by different experimental branches including a combination with a new storage-cooler ring system. This system consists of a collector ring (CR) and a new experimental storage ring (NESR) which allow precision mass and lifetime measurements as well as in-ring reaction studies. The NESR can be operated in combination with an electron ring to measure electron scattering with exotic nuclei. This electron heavy-ion collider will open up new fields for nuclear structure research.

Published
2002

29. Structure of 33Mg sheds new light on the N=20 island of inversion

Author

Thomas Nilsson, A. Musumarra, A. Prochazka, C. Nociforo, Imrich Szarka, Mattias Lantz, R. Knöbel, Hans Geissel, Yutaka Utsuno, P. Maierbeck, C. Perro, K. Mahata, Horst Lenske, Helmut Weick, Barry Davids, Takaharu Otsuka, D. Boutin, D. Cortina-Gil, Birgit Kindler, M. Winkler, Thomas Aumann, Roman Gernhäuser, Peter Strmen, C. Scheidenberger, R. Janik, M. Diakaki, Björn Jonson, R. Krücken, Bao-Hua Sun, J. Gerl, Y. Litvinov, Isao Tanihata, Rituparna Kanungo, Branislav Sitar, and F. Farinon

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Nucleon removal or knockout reactions, 010308 nuclear & particles physics, Island of inversion, 01 natural sciences, Shell structure, Baryon, Full width at half maximum, Eikonal model, 0103 physical sciences, Atomic physics, 010306 general physics, Ground state, Nucleon, Spectroscopy, Nuclear Experiment, Isotopes of magnesium, Magic number, Radioactive beams
Abstract

The first reaction spectroscopy on the ground state structure of 33 Mg through the measurement of the longitudinal momentum distribution from the one-neutron removal reaction using a C target at 898 A MeV is reported. The experiment was performed at the FRS, GSI. The distribution has a relatively narrow width (150 ± 3MeV / c (FWHM)) and the one-neutron removal cross-section is 74 ± 4mb.Anin- creased contribution from the 2 p 3 / 2 orbital is required to explain the observation showing its lowering compared to existing model predictions. This provides new information regarding the configuration of 33 Mg and the island of inversion. ispartof: Physics Letters B vol:685 issue:4 pages:253-257 status: published

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