Search

Your search keyword '"U. Forsberg"' showing total 75 results
Start Over Author "U. Forsberg"
75 results on '"U. Forsberg"'

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

Author

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

Subjects
Physics, QC1-999
Abstract

The radioactivity of 76160Os84 and 74156W82 that lie at the two-proton drip line has been measured in an experiment performed at the Accelerator Laboratory of the University of Jyväskylä. The 160Os nuclei were produced using fusion-evaporation reactions induced by a beam of 310 MeV 58Ni ions bombarding a 106Cd target. The 160Os ions were separated in flight using the recoil separator MARA and implanted into a double-sided silicon strip detector, which was used to measure their decays. The α decays of the ground state of 160Os (Eα = 7092(15) keV, t1/2 = 97−32+97 μs) and its isomeric state (Eα = 8890(10) keV, t1/2 = 41−9+15 μs) were measured, allowing the excitation energy of the isomer to be determined as 1844(18) keV. These α-decay properties and the excitation energy of the isomer are compared with systematics. The α decays were correlated with subsequent decays to investigate the β decays of the ground state of 156W, revealing that unlike its isotones, both low-lying isomers were populated in its daughter nuclide, 156Ta. An improved value for the half-life of the proton-decaying high-spin isomeric state in 73156Ta83 of 333−22+25 ms was obtained in a separate experiment using the same experimental systems with a 102Pd target. This result was employed to improve the precision of the half-life determined for 156W, which was measured as 157−34+57 ms.

Published
2023
Full Text
View/download PDF

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

Author

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

Subjects
Physics, QC1-999
Abstract

The spectroscopic quadrupole moment of the first 2+ state of 12C has been measured employing the Coulomb-excitation re-orientation technique. Our result of Qs(21+)=+9.3−3.8+3.5efm2 suggests a larger oblate deformation than previously reported. Combining this with the consistently re-analyzed adopted value, we present the most precise value to date of Qs(21+)=+9.5(18)efm2, which is consistent with a geometrical rotor description. This simple outcome is compared to state-of-the-art shell-model, mean-field, ab initio calculations, cluster-based and geometrical-like theories, which show varying degrees of emergent quadrupole collectivity.

Published
2023
Full Text
View/download PDF

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

Author

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

Subjects
nuclear chemistry, radiochemistry, superheavy elements, element 114, adsorption, recoil separators, Chemistry, QD1-999
Abstract

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

Published
2022
Full Text
View/download PDF

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

Author

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

Subjects
Physics, QC1-999
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. Keywords: Production of radioactive nuclei, α decay, Multi-nucleon transfer reactions, Quasifission

Published
2018
Full Text
View/download PDF

5. A new assessment of the alleged link between element 115 and element 117 decay chains

Author

U. Forsberg, D. Rudolph, C. Fahlander, P. Golubev, L.G. Sarmiento, S. Åberg, M. Block, Ch.E. Düllmann, F.P. Heßberger, J.V. Kratz, and A. Yakushev

Subjects
Physics, QC1-999
Abstract

A novel rigorous statistical treatment is applied to available data (May 9, 2016) from search and spectroscopy experiments on the elements with atomic numbers Z=115 and Z=117. The present analysis implies that the hitherto proposed cross-reaction link between α-decay chains associated with the isotopes 293117 and 289115 is highly improbable.

Published
2016
Full Text
View/download PDF

6. In-beam $$\gamma $$-ray spectroscopy of $$^{94}$$Ag

Author

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

Subjects
Nuclear and High Energy Physics
Abstract

A recoil-beta-tagging experiment has been performed to study the excited $$T=0$$ T = 0 and $$T=1$$ T = 1 states in the odd–odd $$N=Z$$ N = Z nucleus $$^{94}$$ 94 Ag, populated via the $$^{40}$$ 40 Ca($$^{58}$$ 58 Ni,1p3n)$$^{94}$$ 94 Ag reaction. The experiment was conducted 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 $$\gamma $$ γ rays emitted at the reaction target, a number of transitions between excited states in $$^{94}$$ 94 Ag have been identified. The timing characteristics of these transitions confirm that they fall within decay sequences that feed the short-lived $$T=1$$ T = 1 ground state of $$^{94}$$ 94 Ag. The transitions are proposed to proceed within and between the sets of states with $$T=0$$ T = 0 and $$T=1$$ T = 1 . Possible correspondence between some of these transitions from analog states in $$^{94}$$ 94 Pd has been discussed, and shell-model calculations including multipole and monopole electromagnetic effects have been presented, in order to enable predictions of the decay patterns between the $$T=0$$ T = 0 and $$T=1$$ T = 1 states and to allow a theoretical set of Coulomb energy differences to be calculated for the $$A = 94$$ A = 94 $$T=1$$ T = 1 analog states.

Published
2023
Full Text
View/download PDF

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

Author

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

Published
2023
Full Text
View/download PDF

8. Observation of a correlated free four-neutron system

Author

M. Duer, T. Aumann, R. Gernhäuser, V. Panin, S. Paschalis, D. M. Rossi, N. L. Achouri, D. Ahn, H. Baba, C. A. Bertulani, M. Böhmer, K. Boretzky, C. Caesar, N. Chiga, A. Corsi, D. Cortina-Gil, C. A. Douma, F. Dufter, Z. Elekes, J. Feng, B. Fernández-Domínguez, U. Forsberg, N. Fukuda, I. Gasparic, Z. Ge, J. M. Gheller, J. Gibelin, A. Gillibert, K. I. Hahn, Z. Halász, M. N. Harakeh, A. Hirayama, M. Holl, N. Inabe, T. Isobe, J. Kahlbow, N. Kalantar-Nayestanaki, D. Kim, S. Kim, T. Kobayashi, Y. Kondo, D. Körper, P. Koseoglou, Y. Kubota, I. Kuti, P. J. Li, C. Lehr, S. Lindberg, Y. Liu, F. M. Marqués, S. Masuoka, M. Matsumoto, J. Mayer, K. Miki, B. Monteagudo, T. Nakamura, T. Nilsson, A. Obertelli, N. A. Orr, H. Otsu, S. Y. Park, M. Parlog, P. M. Potlog, S. Reichert, A. Revel, A. T. Saito, M. Sasano, H. Scheit, F. Schindler, S. Shimoura, H. Simon, L. Stuhl, H. Suzuki, D. Symochko, H. Takeda, J. Tanaka, Y. Togano, T. Tomai, H. T. Törnqvist, J. Tscheuschner, T. Uesaka, V. Wagner, H. Yamada, B. Yang, L. Yang, Z. H. Yang, M. Yasuda, K. Yoneda, L. Zanetti, J. Zenihiro, M. V. Zhukov, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Research unit Nuclear & Hadron Physics, and Nuclear Energy

Subjects
Multidisciplinary, Nuclear Force, Nuclear Structure, Tetraneutron, Reactions with Radioactive Beams, Physics, ddc:500, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Nature 606(7915), 678 - 682 (2022). doi:10.1038/s41586-022-04827-6, Published by Nature Publ. Group, London [u.a.]

Published
2022
Full Text
View/download PDF

9. Experimental Study of $^{4}n$ by Directly Detecting the Decay Neutrons

Author

Atsumi Saito, Yohei Shimizu, H. Törnqvist, B. Monteagudo, T. Isobe, M. Caamaño, H. Scheit, S. Kiyotake, J. Tscheuschner, M. L. Cortés, F. M. Marqués, N. Fukuda, N. A. Orr, J. M. Gheller, A. Gillibert, A. Matta, K. Yoneda, L. Stuhl, Z. Elekes, I. Kuti, V. Wagner, M. Miwa, Z. Halász, A. Obertelli, S. Kim, A. Revel, L. Zanetti, N. L. Achouri, S. Takeuchi, F. Dufter, C. A. Douma, S. Masuoka, Stefanos Paschalis, R. Gernhäuser, S. Chen, Nobuyuki Chiga, S. Storck, T. Shimada, M.N. Harakeh, P. Koseoglou, T. Harada, B. Yang, M. Matsumoto, H. Takeda, D. S. Ahn, Yuya Kubota, H. Yamada, Yasuhiro Togano, A. Hirayama, Y. Yasuda, T. Fujino, D. M. Rossi, Nasser Kalantar-Nayestanaki, J. Tanaka, M. Böhmer, N. Inabe, Didier Beaumel, S. Park, Thomas Aumann, H. Baba, Tomohiro Uesaka, F. Schindler, J. Feng, Zaihong Yang, I. Murray, Julien Gibelin, K. Boretzky, S. W. Huang, B. Fernández-Domínguez, S. Reichert, Takashi Nakamura, Yu-xin Liu, K. Wimmer, Yukie Maeda, L. Yang, H. Sato, E. Tronchin, P. Doornenbal, Dmytro Symochko, D. Cortina, J. Kahlbow, S. Shimoura, H. Suzuki, Hideaki Otsu, M. Potlog, P. J. Li, J. Mayer, H. Miki, Masaki Sasano, Toshio Kobayashi, Z. Ge, D. Kim, Juzo Zenihiro, T. Tomai, I. Stefan, M. Parlog, H. Simon, V. Panin, Igor Gašparić, C. Lehr, Yosuke Kondo, C. Lenain, U. Forsberg, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), 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), Research unit Nuclear & Hadron Physics, and Nuclear Energy

Subjects
Nuclear structure and force, tetraneutron, direct reactions, radioactive beams, Physics, Nuclear physics, 010308 nuclear & particles physics, 0103 physical sciences, Tetraneutron, Neutron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Atomic and Molecular Physics, and Optics, 3. Good health
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 $$^{8}$$ He(p, 2p) $$^{7}$$ H{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
2021
Full Text
View/download PDF

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

Author

J. Louko, A. Såmark-Roth, H. M. Albers, Michael Block, J. M. Gates, S. Götz, Dirk Rudolph, Daniel Cox, J. L. Egido, E. Parr, M. Albertsson, H. Brand, D. A. Shaughnessy, R-D Herzberg, Philippos Papadakis, I. Kojouharov, J. Krier, Norbert Trautmann, B. G. Carlsson, Ingemar Ragnarsson, C.-C. Meyer, J. Khuyagbaatar, Ch. E. Düllmann, M. Götz, R. Cantemir, F. Giacoppo, C. Mokry, Birgit Kindler, Jörg Runke, J. Heery, L. Lens, N. Kurz, U. Forsberg, J. Eberth, D. S. Judson, Y. Hrabar, Petra Thörle-Pospiech, J. L. Pore, Sven Åberg, H. Schaffner, Matthias Schädel, T. Calverley, A. K. Mistry, Bettina Lommel, Egon Jäger, Pavel Golubev, J. Ljungberg, Alexander Yakushev, J. V. Kratz, Claes Fahlander, R. M. Clark, B. Schausten, Luis Sarmiento, and Juha Uusitalo

Subjects
Physics, General Physics and Astronomy, chemistry.chemical_element, Isotopes of flerovium, 7. Clean energy, 01 natural sciences, Island of stability, Flerovium, chemistry, Excited state, 0103 physical sciences, Decay chain, Alpha decay, Atomic number, Atomic physics, 010306 general physics, Spectroscopy
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 fur 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
Full Text
View/download PDF

11. 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
Full Text
View/download PDF

12. 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
Full Text
View/download PDF

13. Experimental study of 4 n with 8He(p,2p) reaction

Author

M. Böhmer, Masaki Sasano, S. Reichert, Naohito Inabe, S. Chen, T. Shimada, M. Matsumoto, Susumu Shimoura, I. Stefan, J. Kahlbow, N. Kalantar-Nayestanaki, T. Harada, D. Symochko, István Kuti, S. W. Huang, D. Cortina, Tomohiro Uesaka, Z. Ge, N. L. Achouri, Yosuke Kondo, Hiroyuki Takeda, K. Yoneda, B. Fernández-Domínguez, U. Forsberg, Z. Elekes, Roman Gernhäuser, Y. Yasuda, H. Suzuki, Yohei Shimizu, D. Beaumel, D. Kim, C. A. Douma, Yukie Maeda, A. Hirayama, J. M. Gheller, Heiko Scheit, F. Dufter, T. Elidiano, Yasuhiro Togano, M. L. Cortés, M. Potlog, Nobuyuki Chiga, P. J. Li, Juzo Zenihiro, B. Yang, T. Isobe, M. Caamaño, Thomas Aumann, H. T. Törnqvsit, A. Gillibert, D. S. Ahn, F. Schindler, M.N. Harakeh, J. Feng, J. Tscheuschner, S. Kim, Atsumi Saito, L. Zanetti, P. Koseoglou, V. Wagner, M. Parlog, B. M. Godoy, N. Orr, Takashi Nakamura, Yu-xin Liu, J. Mayer, A. Obertelli, Yuya Kubota, Hideaki Otsu, S. Storck, S. Masuoka, K. Boretzky, Kathrin Wimmer, H. Miki, T. Tomai, F. M. Marqués, V. Panin, P. Doornenbal, Stefanos Paschalis, L. Yang, Satoshi Takeuchi, M. A. Knösel, Igor Gašparić, T. Kobayashi, C. Lehr, H. Yang, C. Lenain, M. Miwa, Z. Halász, A. Revel, H. Sato, T. Fujino, D. M. Rossi, H. Baba, S. Park, I. Murray, L. Stuhl, H. Yamada, J. Gibelin, J. Tanaka, Naoki Fukuda, RIKEN Nishina Center for Accelerator-Based Science, German Research Foundation, Federal Ministry of Education and Research (Germany), Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), 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, Paper, History, 010308 nuclear & particles physics, tetraneutron, nuclear force, proton knock-out, radioactive beams, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Computer Science Applications, Education, ddc, Nuclear physics, 0103 physical sciences, Tetraneutron, Neutron, ddc:530, 010306 general physics
Abstract

7 pags., 3 figs. -- 27th International Nuclear Physics Conference (INPC2019), The tetraneutron has attracted the attention of nuclear physicists during the past decades, but there is still no unambiguous confirmation of its existence or nonexistence. A new experiment based on 8 He(p,2p)7H{t+4n} 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., We acknowledge the support of the RIBF accelerator staff and the BigRIPS team for providing the high-quality beam. Z. H. Yang acknowledges the financial support from the Foreign Postdoctoral Researcher program of RIKEN. T. Aumann acknowledges the support by DFG via SFB 1245. P. Koseoglou acknowledges the support from BMBF (NUSTAR.DA grant No.05P 15RDFN1).

Published
2020
Full Text
View/download PDF

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

Author

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

Subjects
Physics, Nuclear physics, Nuclear Theory, Nuclear fusion, Decay chain, Alpha decay, Actinide, Superheavy Elements, Nuclear Experiment, Recoil separator
Abstract

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

Published
2019
Full Text
View/download PDF

15. β decay of Cd127 and excited states in In127

Author

I. Kojouharov, L. Canete, A. Álvarez Fernández, Anu Kankainen, Sami Rinta-Antila, Victor Vaquero, Tommi Eronen, N. Lalović, Ch. Lorenz, M. Reponen, Jari Partanen, A. Såmark-Roth, A. de Roubin, N. Kurz, M. Vilen, Daniel Cox, Dmitrii Nesterenko, Luis Sarmiento, U. Forsberg, Pavel Golubev, A. Jungclaus, and Dirk Rudolph

Subjects
Physics, Decay scheme, 010308 nuclear & particles physics, Nuclear shell model, Penning trap, 01 natural sciences, Beta decay, Mass separation, Excited state, 0103 physical sciences, Gamma spectroscopy, Atomic physics, 010306 general physics, Ground state
Abstract

A dedicated spectroscopic study of the β decay of 127Cd was conducted at the IGISOL facility at the University of Jyvaskyla. Following high-resolution mass separation in a Penning trap, β-γ-γ coincidences were used to considerably extend the decay scheme of 127In. The β-decaying 3/2+ and 11/2- states in 127Cd have been identified with the 127Cd ground state and the 283-keV isomer. Their respective half-lives have been measured to 0.45(+12-8)s and 0.36(4) s. The experimentally observed β feeding to excited states of 127In and the decay scheme of 127In are discussed in conjunction with large-scale shell-model calculations.

Published
2019
Full Text
View/download PDF

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

Author

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

Subjects
Nuclear and High Energy Physics, alpha decay, Fission, Superheavy elements, chemistry.chemical_element, Superheavy Elements, nucl-ex, Atomic, 01 natural sciences, 7. Clean energy, Nuclear physics, Particle and Plasma Physics, Recoil, 0103 physical sciences, Nuclear, Element 115, α decay, Nuclear Experiment, 010306 general physics, Ununpentium, Spontaneous fission, Physics, Quantum Physics, Uup, 010308 nuclear & particles physics, Molecular, Nuclear & Particles Physics, Superheavy element, chemistry, Decay chain, Alpha decay, Astronomical and Space Sciences, Excitation
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
Full Text
View/download PDF

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

Author

Alexander Yakushev, Ingemar Ragnarsson, N. Kurz, Julia Even, K. P. Rykaczewski, T. Torres, Carl J Gross, I. Kojouharov, Andreas Türler, R.-D. Herzberg, Dirk Rudolph, J. P. Omtvedt, Jörg Runke, B. Schausten, Luis Sarmiento, J. Krier, F. P. Heßberger, Pavel Golubev, Ch. E. Düllmann, J. M. Gates, Birgit Kindler, L.-L. Andersson, Michael Block, J. V. Kratz, B. G. Carlsson, Norbert Wiehl, Bettina Lommel, Klaus Eberhardt, Dieter Ackermann, Petra Thörle-Pospiech, Norbert Trautmann, Egon Jäger, H. Schaffner, Claes Fahlander, Kenneth E. Gregorich, J. Gerl, Matthias Schädel, A. Di Nitto, A. Ward, U. Forsberg, C. Mokry, J Ljungberg, A. Såmark-Roth, Philippos Papadakis, H. Brand, A. K. Mistry, Jadambaa Khuyagbaatar, and Daniel Cox

Subjects
Physics, 010308 nuclear & particles physics, Nuclear shell model, Half-life, 01 natural sciences, Nuclear physics, Microsecond, 0103 physical sciences, Atomic nucleus, Gamma spectroscopy, Alpha decay, Decay chain, Nuclide, 010306 general physics
Abstract

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

Published
2018
Full Text
View/download PDF

18. Study of multi-neutron systems with SAMURAI spectrometer

Author

K. Yoneda, Z. Elekes, Masaki Sasano, Heiko Scheit, Atsumi Saito, N. Inabe, I. Stefan, J. Tscheuschner, Mohsen Harakeh, Julien Gibelin, M. A. Knösel, K. Boretzky, Z. Ge, Takashi Nakamura, D. Kim, H. Sato, J. Kahlbow, Igor Gašparić, Y. Yasuda, Susumu Shimoura, T. Isobe, Juzo Zenihiro, M. Caamaño, Yosuke Kondo, S. Masuoka, H. Suzuki, A. Hirayama, S. W. Huang, C. A. Douma, B. M. Godoy, Z. Halász, H. Yamada, C. Lehr, M. Böhmer, Nobuyuki Chiga, A. Revel, N. L. Achouri, P. Koseoglou, Kathrin Wimmer, V. Wagner, N. A. Orr, M. Potlog, M. Miwa, B. Yang, A. Obertelli, T. Harada, H. T. Törnqvsit, S. Reichert, H. Miki, D. S. Ahn, T. Tomai, István Kuti, J. Mayer, J. Tanaka, S. Park, Yasuhiro Togano, M. Parlog, Naoki Fukuda, Yu-xin Liu, S. Chen, V. Panin, L. Zanetti, F. Schindler, S. Storck, T. Shimada, Tomohiro Uesaka, J. Feng, M. Matsumoto, Zaihong Yang, U. Forsberg, Roman Gernhäuser, I. Murray, F. Dufter, D. Symochko, L. Stuhl, J. M. Gheller, Hideaki Otsu, D. Beaumel, T. Kobayashi, H. Takeda, A. Gillibert, D. Cortina, P. Doornenbal, L. Yang, Nasser Kalantar-Nayestanaki, Satoshi Takeuchi, Thomas Aumann, Stefanos Paschalis, T. Fujino, D. M. Rossi, H. Baba, Yohei Shimizu, M. L. Cortés, F. M. Marqués, B. Fernández-Domínguez, Yuya Kubota, Yukie Maeda, S. K. Kim, P. J. Li, Laboratoire de physique corpusculaire de Caen (LPCC), Université de Caen Normandie (UNICAEN), Normandie Université (NU)-Normandie Université (NU)-École Nationale Supérieure d'Ingénieurs de Caen (ENSICAEN), Normandie Université (NU)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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), Normandie Université (NU)-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), 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), 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, Firm conclusion, Spectrometer, FOS: Physical sciences, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 010305 fluids & plasmas, Nuclear physics, 0103 physical sciences, Tetraneutron, Neutron, Nuclear Experiment (nucl-ex), 010306 general physics, 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
2018
Full Text
View/download PDF

19. Quantum-state-selective decay spectroscopy of Ra213

Author

M. Eibach, J. Wenzl, Ingemar Ragnarsson, M. Dworschak, Robert Hoischen, Luis Sarmiento, Lutz Schweikhard, Dmitrii Nesterenko, Jadambaa Khuyagbaatar, I. Kojouharov, Pavel Golubev, Sanna Stolze, Manuel Lazo Cortés, C. Droese, Dirk Rudolph, Michael Block, L.-L. Andersson, U. Forsberg, F. P. Heßberger, Dieter Ackermann, Daniel Ward, H. Schaffner, and Ch. Lorenz

Subjects
Physics, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, Nuclear shell model, Penning trap, 01 natural sciences, Nuclear physics, Universal linear accelerator, 0103 physical sciences, Gamma spectroscopy, Alpha decay, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy, Ground state, Radioactive decay
Abstract

An experimental scheme combining the mass resolving power of a Penning trap with contemporary decay spectroscopy has been established at GSI Darmstadt. The Universal Linear Accelerator (UNILAC) at GSI Darmstadt provided a $^{48}\mathrm{Ca}$ beam impinging on a thin $^{170}\mathrm{Er}$ target foil. Subsequent to velocity filtering of reaction products in the Separator for Heavy Ion reaction Products (SHIP), the nuclear ground state of the $5n$ evaporation channel $^{213}\mathrm{Ra}$ was mass-selected in SHIPTRAP, and the $^{213}\mathrm{Ra}$ ions were finally transferred into an array of silicon strip detectors surrounded by large composite germanium detectors. Based on comprehensive geant4 simulations and supported by theoretical calculations, the spectroscopic results call for a revision of the decay path of $^{213}\mathrm{Ra}$, thereby exemplifying the potential of a combination of a mass-selective Penning trap device with a dedicated nuclear decay station and contemporary geant4 simulations.

Published
2017
Full Text
View/download PDF

20. List of contributors

Author

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

Published
2017
Full Text
View/download PDF

21. 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
Full Text
View/download PDF

22. Superheavy-element spectroscopy: Correlations along element 115 decay chains

Author

Luis Sarmiento, Dirk Rudolph, U. Forsberg, Pavel Golubev, Claes Fahlander, Greco, V., La Cognata, M., Pirrone, S., Rizzo, F., and Spitaleri, C.

Subjects
Physics, element 115, 010308 nuclear & particles physics, QC1-999, correlation analysis, Superheavy Elements, 01 natural sciences, 7. Clean energy, Nuclear physics, superheavy elements, 0103 physical sciences, Correlation analysis, Atomic nucleus, Subatomic Physics, Decay chain, Element (category theory), Atomic physics, 010306 general physics, Spectroscopy, Natural Sciences
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

23. New Short-Lived IsotopeU221and the Mass Surface NearN=126

Author

U. Forsberg, Shigeo Minami, Ch. M. Mrosek, R.-D. Herzberg, Daniel Cox, T. Torres De Heidenreich, Norbert Wiehl, Michael Block, Bettina Lommel, Pavel Golubev, B. Schausten, J. Krier, Luis Sarmiento, I. Pysmenetska, N. Kurz, Juha Uusitalo, A. Hübner, J. Jeppsson, V. Yakusheva, Joerg Hoffmann, L.-L. Andersson, Julia Even, Dirk Rudolph, Birgit Kindler, J. Steiner, A. K. Mistry, Ch. E. Düllmann, F. P. Heßberger, W. Hartmann, M. Wegrzecki, Egon Jäger, H. Brand, Dieter Ackermann, Alexander Yakushev, H. Schaffner, J. V. Kratz, Matthias Schädel, Moumita Maiti, and J. Khuyagbaatar

Subjects
Physics, Isotope, Isotopes of uranium, Analytical chemistry, General Physics and Astronomy, Nuclear fusion, Alpha decay, Atomic physics, Recoil separator
Abstract

Two short-lived isotopes ^{221}U and ^{222}U were produced as evaporation residues in the fusion reaction ^{50}Ti+^{176}Yb at the gas-filled recoil separator TASCA. An α decay with an energy of E_{α}=9.31(5) MeV and half-life T_{1/2}=4.7(7) μs was attributed to ^{222}U. The new isotope ^{221}U was identified in α-decay chains starting with E_{α}=9.71(5) MeV and T_{1/2}=0.66(14) μs leading to known daughters. Synthesis and detection of these unstable heavy nuclei and their descendants were achieved thanks to a fast data readout system. The evolution of the N=126 shell closure and its influence on the stability of uranium isotopes are discussed within the framework of α-decay reduced width.

Published
2015
Full Text
View/download PDF

24. Decay spectroscopy of element 115 daughters:Rg280→Mt276andMt276→Bh272

Author

R. M. Clark, Alexander Yakushev, G.K. Pang, Luis Sarmiento, D. T. Olive, M. Cromaz, P. R. Mudder, W. Loveland, A. C. Rice, K. E. Gregorich, Dirk Rudolph, Claes Fahlander, E. C. Uribe, C. M. Campbell, D. L. Bleuel, Andreas Wiens, A. O. Macchiavelli, O. Gothe, E. M. May, P. Fallon, A. Di Nitto, N. E. Esker, Ch. E. Düllmann, R. M. Farjadi, H. L. Crawford, Heino Nitsche, Jadambaa Khuyagbaatar, J. Rissanen, M. A. Stoyer, U. Forsberg, J. M. Gates, Jennifer A. Shusterman, and Michael Block

Subjects
Physics, Nuclear and High Energy Physics, Photon, Decay scheme, Cyclotron, Compton scattering, law.invention, Nuclear physics, law, Gamma spectroscopy, Alpha decay, Decay chain, Atomic physics, Spectroscopy
Abstract

Forty-six decay chains, assigned to the decay of 288-115, were produced using the 243Am(48Ca,3n)288-115 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 280Rg and 276Mt, respectively). Upon combining these data with those from 22 288-115 decay chains observed in a similar experiment, updated level schemes in 276Mt and 272Bh (populated by the α decay of 280Rg and 276Mt, respectively) are proposed. Photons were observed in the energy range expected for K x rays coincident with the α decay of both 280Rg and 276Mt. 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. (Less)

Published
2015
Full Text
View/download PDF

25. Nuclear Structure Notes on Element 115 Decay Chains

Author

U. Forsberg, Dirk Rudolph, Luis Sarmiento, Lipoglavšek, Matej, Milin, Matko, Nikšić, Tamara, Szilner, Suzana, and Vretenar, Dario

Subjects
Physics, Nuclear reaction, Superheavy Elements, 010308 nuclear & particles physics, Nuclear structure, Nuclear Structure, 01 natural sciences, Nuclear physics, 0103 physical sciences, Atomic nucleus, Subatomic Physics, Decay chain, Alpha decay, Nuclear drip line, Atomic physics, 010306 general physics
Abstract

Hitherto collected data on more than hundred α-decay chains stemming from element 115 are combined to probe some aspects of the underlying nuclear structure of the heaviest atomic nuclei yet created in the laboratory.

Published
2015
Full Text
View/download PDF

26. High-precision mass measurements for the isobaric multiplet mass equation atA= 52

Author

Michael Block, V. S. Kolhinen, Iain Moore, Claes Fahlander, Anu Kankainen, Dmitrii Nesterenko, Annika Voss, Juha Äystö, Daniel Cox, J. Gerl, Tommi Eronen, Luis Sarmiento, Ari Jokinen, Ch. Lorenz, Pavel Golubev, L. Canete, Jukka Koponen, Philippos Papadakis, N. Lalović, J. Hakala, Juuso Reinikainen, U. Forsberg, Sami Rinta-Antila, Dirk Rudolph, and Helsinki Institute of Physics

Subjects
massaspektrometria, Nuclear and High Energy Physics, isobaric multiplet, Proton, Co-52, Proton decay, astrofysiikka, Penning trap, FOS: Physical sciences, kupari, Quadratic form (statistics), atomipainot, 114 Physical sciences, 01 natural sciences, 7. Clean energy, PENNING TRAPS, 0103 physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, 010306 general physics, Multiplet, mass measurement, Physics, isotoopit, SPECTROSCOPY, 010308 nuclear & particles physics, MIRROR NUCLEI, RAMSEY METHOD, MN-52, Mass formula, ANALOG STATES, PROTON RADIOACTIVITY, COULOMB DISPLACEMENT ENERGIES, Isobaric process, BETA-RAY, Atomic physics, ydinfysiikka, DECAY, Excitation
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
Full Text
View/download PDF

28. Ca48+Bk249Fusion Reaction Leading to ElementZ=117: Long-Livedα-DecayingDb270and Discovery ofLr266

Author

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

Subjects
Nuclear physics, Physics, Isotope, Atomic nucleus, General Physics and Astronomy, Nuclear fusion, Decay chain, Atomic number, Atomic physics, Radioactive decay, Recoil separator, Spontaneous fission
Abstract

The superheavy element with atomic number Z=117 was produced as an evaporation residue in the 48Ca+249Bk fusion reaction at the gas-filled recoil separator TASCA at GSI Darmstadt, Germany. The radioactive decay of evaporation residues and their α-decay products was studied using a detection setup that allowed measuring decays of single atomic nuclei with half-lives between sub-μs and a few days. Two decay chains comprising seven α decays and a spontaneous fission each were identified and are assigned to the isotope 294-117 and its decay products. A hitherto unknown α-decay branch in 270Db (Z=105) was observed, which populated the new isotope 266Lr (Z=103). The identification of the long-lived (T1/2=1.0+1.9−0.4 h) α-emitter 270Db marks an important step towards the observation of even more long-lived nuclei of superheavy elements located on an “island of stability.” (Less)

Published
2014
Full Text
View/download PDF

29. 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
Full Text
View/download PDF

30. Decay of the high-Kisomeric state to a rotational band in257Rf

Author

H. L. Crawford, U. Forsberg, P. R. Mudder, M. Cromaz, K. E. Gregorich, I. Y. Lee, J. M. Gates, N. E. Esker, Andreas Wiens, R. M. Clark, H. L. Liu, C. M. Campbell, P. Fallon, Dirk Rudolph, G.K. Pang, A. O. Machiavelli, M. A. Stoyer, O. Gothe, J. Rissanen, A. C. Rice, Heino Nitsche, and Furong Xu

Subjects
Physics, Coupling, Nuclear and High Energy Physics, Isotope, State (functional analysis), Electron, Atomic physics, Spectroscopy, Spin (physics), Excitation, High-κ dielectric
Abstract

The 257Rf isotope has been populated via the 208Pb(50Ti, n) fusion-evaporation reaction and delayed gamma-ray and electron decay spectroscopy has been performed. The existence of a high-K isomeric state in 257Rf has been confirmed. The isomeric state decays into a rotational band based on the 11/2(-)[725] excitation, which was observed up to spin of (23/2(-)). Three multipolarity-E1 gamma transitions depopulating the isomeric state have been observed, which fixes the spin for that state to (21/2(+)). This assignment agrees with theoretical predictions calculated with the microscopic-macroscopic approach, which suggest the isomeric state to be formed by coupling an unpaired 11/2(-)[725] quasineutron to the (1/2(-)[521] circle times 9/2(+)[624])(5)- two-quasiproton state. The same two-quasiproton excitation is possible for the lowest isomer in 256Rf. (Less)

Published
2013
Full Text
View/download PDF

31. 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
Full Text
View/download PDF

32. High-precision Mass Measurements of 203-207Rn and 213Ra with SHIPTRAP

Author

Michael Block, Christian Weber, M. Dworschak, Yu. N. Novikov, F. Herfurth, Sanna Stolze, C. Droese, Stefan G. Hofmann, D. Nesterenko, Wolfgang R. Plaß, E. Minaya Ramirez, C. Scheidenberger, M. Eibach, P. G. Thirolf, Klaus Blaum, Lutz Schweikhard, Dirk Rudolph, F. P. Heßberger, L. L. Andersson, Jens Ketelaer, Sergey Eliseev, Dieter Ackermann, Daniel Rodríguez, U. Forsberg, Gerrit Marx, and E. Haettner

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Hadron, Subatomic Physics, Nuclear fusion, Nuclide, Atomic physics, Mass spectrometry
Abstract

The masses of the nuclides 203-207Rn and 213Ra were measured directly for the first time with the Penning-trap mass spectrometer SHIPTRAP at GSI Darmstadt. The results confirm the previously determined mass values. The mass uncertainties for 205Rn and 213Ra were significantly reduced. The results are relevant for the investigation of the nuclear shell structure between N = 82 and N = 126 . As an indicator of structural changes the two-neutron separation energies $ S_{2n}(Z,N)$ have been studied.

Published
2013

33. First superheavy element experiments at the GSI recoil separator TASCA: The production and decay of element 114 in thePu244(Ca48,3-4n) reaction

Author

Susanta Lahiri, Andreas Türler, K. E. Gregorich, Dieter Ackermann, J. Krier, Matthias Schädel, Michael Block, Bettina Lommel, Petra Thörle-Pospiech, J. V. Kratz, H. Schaffner, R.-D. Herzberg, Klaus Eberhardt, Alexander Yakushev, A. V. Gorshkov, Dirk Rudolph, Jadambaa Khuyagbaatar, J. M. Gates, Ch. E. Düllmann, Moumita Maiti, F. P. Heßberger, Egon Jäger, Julia Even, Jnaneswari Gellanki, Jörg Runke, R. Graeger, B. Schausten, U. Forsberg, Birgit Kindler, E. Schimpf, W. Hartmann, Juha Uusitalo, M. Wegrzecki, J. Steiner, A. Semchenkov, A. Hübner, N. Kurz, W. Brüchle, H. G. Essel, P. A. Ellison, D. Liebe, Norbert Wiehl, J. P. Omtvedt, Heino Nitsche, E. Parr, J. Dvorak, D. Hild, and L. L. Andersson

Subjects
Nuclear physics, Physics, Nuclear reaction, Nuclear and High Energy Physics, Isotope, Neutron emission, Transactinide element, Decay chain, Alpha decay, Transuranium element, Radioactive decay
Abstract

Experiments with the new recoil separator, Transactinide Separator and Chemistry Apparatus (TASCA), at the GSI were performed by using beams of Ca-48 to irradiate targets of Pb206-208, which led to the production of No252-254 isotopes. These studies allowed for evaluation of the performance of TASCA when coupled to a new detector and electronics system. By following these studies, the isotopes of element 114 ((288-291)114) were produced in irradiations of Pu-244 targets with Ca-48 beams at compound nucleus excitation energies around 41.7 and 37.5 MeV, demonstrating TASCA's ability to perform experiments with picobarn-level cross sections. A total of 15 decay chains were observed and were assigned to the decay of 288-291114. A new a-decay branch in (281)Ds was observed, leading to the new nucleus (277)Hs. (Less)

Published
2011
Full Text
View/download PDF

34. Congruence of decay chains of elements 113, 115, and 117

Author

Dirk Rudolph, Claes Fahlander, and U. Forsberg

Subjects
Physics, 010308 nuclear & particles physics, QC1-999, chemistry.chemical_element, Transactinide element, 01 natural sciences, Nuclear physics, Combinatorics, Data set, Set (abstract data type), Flerovium, chemistry, Congruence (geometry), 0103 physical sciences, Livermorium, Decay chain, Element (category theory), 010306 general physics
Abstract

Superheavy element research relies heavily on the detection of correlated decay chains. When several chains have been detected, it is natural to ask whether they form one congruent set, or whether they should be further divided into subsets. To statistically assess the congruence between the chains in a data set, we developed a procedure to calculate a Figure-of-Merit for low-number statistics. In this work, the method is applied to the world data set of odd-Z superheavy nuclei with Z ≥ 113. Some of the postulated sets of chains are found to be congruent, while others are not. The findings are of relevance for the IUPAC and IUPAP approvals of the new elements Z = 113, 115, and 117.

Published
2016
Full Text
View/download PDF

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

Author

Shigeo Minami, Michael Block, Dieter Ackermann, Bettina Lommel, V. Yakusheva, J. Jeppsson, Alexander Yakushev, Jadambaa Khuyagbaatar, Birgit Kindler, J. Krier, T. Torres De Heidenreich, A. Hübner, J. Steiner, J. V. Kratz, N. Kurz, Moumita Maiti, L.-L. Andersson, U. Forsberg, Julia Even, Egon Jäger, Norbert Wiehl, H. Brand, Ch. E. Düllmann, F. P. Heßberger, W. Hartmann, Dirk Rudolph, J. Hoffmann, Matthias Schädel, Jörg Runke, R-D Herzberg, B. Schausten, Luis Sarmiento, Juha Uusitalo, 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), Helmholtz zentrum für Schwerionenforschung GmbH (GSI), 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 Rudolph, Dirk

Subjects
Range (particle radiation), ta114, 010308 nuclear & particles physics, Chemistry, Fission, Physics, QC1-999, nuclear stability, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Superheavy Elements, 7. Clean energy, 01 natural sciences, Recoil separator, Nuclear physics, superheavy elements, 0103 physical sciences, Atomic nucleus, fission, ddc:530, 010306 general physics
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 to 10^24 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 to 10^3 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. (Less)

Published
2016
Full Text
View/download PDF

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

Author

U. Forsberg, D. Rudolph, P. Golubev, L.G. Sarmiento, A. Yakushev, L.-L. Andersson, A. Di Nitto, Ch.E. Düllmann, J.M. Gates, K.E. Gregorich, C.J. Gross, F.P. Heßberger, R.-D. Herzberg, J. Khuyagbaatar, J.V. Kratz, K. Rykaczewski, M. Schädel, S. Åberg, D. Ackermann, M. Block, H. Brand, B.G. Carlsson, D. Cox, X. Derkx, K. Eberhardt, J. Even, C. Fahlander, J. Gerl, E. Jäger, B. Kindler, J. Krier, I. Kojouharov, N. Kurz, B. Lommel, A. Mistry, C. Mokry, H. Nitsche, J.P. Omtvedt, P. Papadakis, I. Ragnarsson, J. Runke, H. Schaffner, B. Schausten, P. Thörle-Pospiech, T. Torres, T. Traut, N. Trautmann, A. Türler, A. Ward, D.E. Ward, and N. Wiehl, Lunardi, S., Bizzeti, P.G., Bucci, C., Chiari, M., Dainese, A., Di Nezza, P., Menegazzo, R., Nannini, A., Signorini, C., Valiente-Dobon, J.J., Forsberg, U., Rudolph, D., 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., 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, Silicon, Physics::Instrumentation and Detectors, QC1-999, Detector, Separator (oil production), Mechanical engineering, chemistry.chemical_element, 7. Clean energy, Nuclear physics, chemistry, Physical Sciences, Subatomic Physics, ddc:530, Decay chain, Nuclide, Nuclear Experiment, Line (formation)
Abstract

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

Published
2014
Full Text
View/download PDF

39. [Untitled]

Author

Johan Jeppsson, F. P. Heßberger, Egon Jäger, Michael Block, Julia Even, E. Merchan, Bettina Lommel, I. Kojouharov, J. Runke, Klaus Eberhardt, Kenneth E. Gregorich, E. Parr, J. Krier, Dirk Rudolph, M. Asai, L. L. Andersson, Luis Sarmiento, Dieter Ackermann, J. V. Kratz, Susanta Lahiri, H. Schaffner, Moumita Maiti, J. Dvorak, U. Forsberg, Pavel Golubev, Jadambaa Khuyagbaatar, J. M. Gates, Jon Petter Omtvedt, R-D Herzberg, Matthias Schädel, Ch. E. Düllmann, Alexander Yakushev, and N. Kurz

Subjects
Physics, Background suppression, Detector, X-ray, General Physics and Astronomy, Decay chain, Atomic number, Atomic physics, Nuclear Experiment, Quadrupole magnet
Abstract

To identify the atomic number of superheavy nuclei produced in Ca-48-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 ion-optical 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
Full Text
View/download PDF

42. Comment on ‘Analysis of decay chains of superheavy nuclei produced in the 249Bk + 48Ca and 243Am + 48Ca reactions’.

Author

U Forsberg and M Leino

Subjects
*SUPERHEAVY elements, *CALCIUM compounds, *CHEMICAL reactions, *EXOTIC nuclei, *INHOMOGENEOUS materials, *NUCLEAR cross sections
Abstract

Zlokazov and Utyonkov (2017 J. Phys. G: Nucl. Part. Phys.44 075107) question the validity of the methods and conclusions presented by Forsberg et al (2016 Nucl. Phys. A953 117). In this comment, we argue that the criticism is invalid. [ABSTRACT FROM AUTHOR]

Published
2019
Full Text
View/download PDF

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

Author

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

Subjects
MASS measurement, ISOBARIC processes, IRON isotopes, PENNING trap mass spectrometry, EXCITATION energy (In situ microanalysis)
Abstract

Masses of 52Co, 52Com, 52Fe, 52Fem, and 52Mn have been measured with the JYFLTRAP double Penning trap mass spectrometer. 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 level) of the quadratic form of the IMME was observed (). The cubic coefficient was 6.0(32) keV (). The excitation energies for the isomer and the T = 2 isobaric analog state in 52Co have been determined to be 374(13) keV and 2922(13) keV, respectively. The measured mass values for 52Co and 52Com are 29(10) keV and 16(15) keV higher, respectively, than obtained in a recent storage-ring experiment, and significantly lower than predicted by extrapolations. Consequently, this has an impact on the proton separation energies for 52Co and 53Ni relevant for the astrophysical rapid proton capture process. The Q value for the proton decay from the isomer in 53Co has been determined with an unprecedented precision, keV. [ABSTRACT FROM AUTHOR]

Published
2017
Full Text
View/download PDF

44. The Emboless® venous chamber efficiently reduces air bubbles: a randomized study of chronic hemodialysis patients.

Author

Forsberg U, Jonsson P, and Stegmayr B

Abstract

Background: When blood passes the extracorporeal circuit, air microbubbles (MBs) contaminate the blood. Some MBs will end up as microemboli in the lung, heart, and brain. MB exposure has no medical purpose and is considered to be bio-incompatible. Selecting venous chambers with a high removal rate of MBs is warranted to reduce the risks of air bio-incompatibility. The primary aim was to compare the Fresenius 5008 (F5008-VC) and the Emboless ® (Emboless-VC) venous chambers regarding the elimination of MBs in the return bloodline during hemodialysis (HD)., Methods: Twenty patients underwent 80 sessions of cross-over HD using both the F5008-VC and the Emboless-VC randomized such that half started with the F5008-VC and half with the Emboless-VC. For 32 of the 80 sessions, measurements were also performed during hemodiafiltrations (HDF) after the initial HD. MBs were measured with an ultrasound device (within the size range of 20-500 µm) at the "inlet" and "outlet" bloodline of the venous chambers. The Wilcoxon pairwise test compared the percentage of MB elimination between venous chambers., Results: During HD, the median reduction of MBs for the outlet was 39% with the F5008-VC and 76% with the Emboless-VC ( P  < .001). During HDF, the reduction was 28% with the F5008-VC and 70% with the Emboless-VC ( P  < .001)., Conclusion: Fewer MBs and subsequently fewer microemboli entered the bloodline of the patient using the Emboless-VC compared to the F5008-VC venous chamber during HD and during HDF. Venous chambers with a high removal rate of MBs will reduce the extent of air emboli., Competing Interests: The results presented in this article have not been published previously in whole or in part, except in abstract format. All three authors declare that they are researchers within the frame of Umea University, Sweden, and clinically active within the field of hemodialysis for more than 20 years. The work has been combined with research and development of medical devices. To clarify the value of a patented venous chamber Emboless®, a company was initiated (Embody AB). Sweden's innovation agency Vinnova, MedTech4Health and Region Västerbotten supported the researcher to perform this clinical study to clarify eventual benefits of Emboless®. All authors are stockholders of the Embody AB company. Independent persons performed safety analysis and monitoring., (© The Author(s) 2024. Published by Oxford University Press on behalf of the ERA.)

Published
2024
Full Text
View/download PDF

45. Elucidating the nature of the proton radioactivity and branching ratio on the first proton emitter discovered 53m Co.

Author

Sarmiento LG, Roger T, Giovinazzo J, Brown BA, Blank B, Rudolph D, Kankainen A, Alvarez-Pol H, Raj AA, Ascher P, Block M, Caamaño-Fresco M, Caceres L, Canete L, Cox DM, Eronen T, Fahlander C, Fernández-Domínguez B, Forsberg U, Lois-Fuentes J, Gerbaux M, Gerl J, Golubev P, Grévy S, Grinyer GF, Habermann T, Hakala J, Jokinen A, Kamalou O, Kojouharov I, Kolhinen VS, Koponen J, Kurz N, Lalović N, Lorenz C, Mauss B, Mentana A, Moore ID, Ortega Moral A, Pancin J, Papadakis P, Pibernat J, Piot J, Pohjalainen I, Reinikainen J, Rinta-Antila S, Schaffner H, Sorlin O, Stodel C, Thomas JC, Versteegen M, and Voss A

Abstract

The observation of a weak proton-emission branch in the decay of the 3174-keV 53m Co isomeric state marked the discovery of proton radioactivity in atomic nuclei in 1970. Here we show, based on the partial half-lives and the decay energies of the possible proton-emission branches, that the exceptionally high angular momentum barriers, [Formula: see text] and [Formula: see text], play a key role in hindering the proton radioactivity from 53m Co, making them very challenging to observe and calculate. Indeed, experiments had to wait decades for significant advances in accelerator facilities and multi-faceted state-of-the-art decay stations to gain full access to all observables. Combining data taken with the TASISpec decay station at the Accelerator Laboratory of the University of Jyväskylä, Finland, and the ACTAR TPC device on LISE3 at GANIL, France, we measured their branching ratios as b p1 = 1.3(1)% and b p2 = 0.025(4)%. These results were compared to cutting-edge shell-model and barrier penetration calculations. This description reproduces the order of magnitude of the branching ratios and partial half-lives, despite their very small spectroscopic factors., (© 2023. Springer Nature Limited.)

Published
2023
Full Text
View/download PDF

46. Venous chambers in clinical use for hemodialysis have limited capacity to eliminate microbubbles from entering the return bloodline: An in vitro study.

Author

Jonsson P, Stegmayr C, Stegmayr B, and Forsberg U

Subjects
Humans, Renal Dialysis, Veins, Microbubbles, Embolism, Air prevention & control
Abstract

Background: During hemodialysis (HD), blood passes through an extracorporeal circuit (ECC). To prevent air administration to the patient, a venous chamber (chamber) is located before the blood return. Microbubbles (MBs) may pass through the chamber and end up as microemboli in organs such as the brain and heart. This in vitro study investigated the efficacy of various chambers in MB removal., Materials and Methods: The in vitro recirculated setting of an ECC included an FX10 dialyzer, a dextran-albumin solution to mimic blood viscosity and chambers with different flow characteristics in clinical use (Baxter: AK98 and Artis, Fresenius: 5008 and 6008) and preclinical test (Embody: Emboless®). A Gampt BCC200 device measured the presence and size of MBs (20-500 μm). Percentage change of MBs was calculated: ΔMB% = 100*(outlet-inlet)/inlet for each size of MB. Blood pump speed (Qb) was 200 (Qb200) or 300 (Qb300) ml/minute. Wilcoxon paired test determined differences., Results: With Qb200 median ΔMB% reduction was: Emboless -58%, AK98 -24%, Fresenius 5008 -23%, Artis -8%, and Fresenius 6008 ± 0%. With Qb300 ΔMB% was: Emboless -36%, AK98 ± 0%, Fresenius 5008 ± 0%, Artis +25%, and Fresenius 6008 + 21%. The Emboless was superior to all other chambers with Qb200 and Qb300 (p < 0.001). Further, the Emboless with Qb300 still eliminated more MBs than all other chambers with Qb200 (p ≤ 0.003)., Conclusion: The results from the present study indicate that flow characteristics of the chamber and the Qb are important factors to limiting exposure of MB to the return bloodline. The Emboless chamber reduced MBs more effective than those chambers in clinical use investigated., (© 2023 The Authors. Artificial Organs published by International Center for Artificial Organ and Transplantation (ICAOT) and Wiley Periodicals LLC.)

Published
2023
Full Text
View/download PDF

47. Microemboli induced by air bubbles may be deposited in organs as a consequence of contamination during medical care.

Author

Forsberg U, Jonsson P, and Stegmayr B

Abstract

Background: Larger volumes of accidental air infused during medical care may end up as emboli while microbubbles of air are supposed to be absorbed and cause no harm. The aim of this autopsy study was to investigate if microbubbles of air accidently entering the bloodline may be detected as microemboli (ME) in tissue such as lungs, brain and heart. If so, do differences in prevalence exist between haemodialysis (HD) and amyotrophic lateral sclerosis (ALS) patients., Methods: Included were data from 44 patients treated by medical healthcare before death. Twenty-five cases had been treated with chronic HD and 19 cases died from ALS. Since air in the bloodline activates coagulation, ME could appear. To discriminate between microbubbles caused by artificial contamination during autopsy versus microbubbles deposited in vivo , tissues were stained with a polyclonal fluorescent antibody against fibrinogen, fibrin and fragments E and D. Fluorescence staining was used to visualize ME counted within 25 microscopic fields (600×) of a tissue preparation. One tissue preparation was used if available from the lung, heart and frontal lobe of the brain and in five cases also the cerebellum., Results: Microbubbles can be verified at autopsy as ME in the lung, heart and brain in tissue from patients exposed to more extensive medical care. There were significantly more ME in the lungs versus the heart or brain. Women had fewer ME than men. The HD group had a higher median of ME per section than the ALS group (lung: 6 versus 3, P  = .007; heart: 2.5 versus 1, P  = .013; brain: 7.5 versus 2, P  = .001) and had more sections with ME findings than the ALS group ( P  = .002). A correlation existed between the time on HD (months) and ME in the lungs., Conclusions: More ME were present in HD patients compared with those who suffered from ALS. Minimizing air contamination from syringes, infusions and bloodlines will decrease ME and subsequent tissue injury., (© The Author(s) 2022. Published by Oxford University Press on behalf of the ERA.)

Published
2022
Full Text
View/download PDF

48. Observation of a correlated free four-neutron system.

Author

Duer M, Aumann T, Gernhäuser R, Panin V, Paschalis S, Rossi DM, Achouri NL, Ahn D, Baba H, Bertulani CA, Böhmer M, Boretzky K, Caesar C, Chiga N, Corsi A, Cortina-Gil D, Douma CA, Dufter F, Elekes Z, Feng J, Fernández-Domínguez B, Forsberg U, Fukuda N, Gasparic I, Ge Z, Gheller JM, Gibelin J, Gillibert A, Hahn KI, Halász Z, Harakeh MN, 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 PJ, Lehr C, Lindberg S, Liu Y, Marqués FM, Masuoka S, Matsumoto M, Mayer J, Miki K, Monteagudo B, Nakamura T, Nilsson T, Obertelli A, Orr NA, Otsu H, Park SY, Parlog M, Potlog PM, Reichert S, Revel A, Saito AT, 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 HT, Tscheuschner J, Uesaka T, Wagner V, Yamada H, Yang B, Yang L, Yang ZH, Yasuda M, Yoneda K, Zanetti L, Zenihiro J, and Zhukov MV

Abstract

A long-standing question in nuclear physics is whether chargeless nuclear systems can exist. To our knowledge, only neutron stars represent near-pure neutron systems, where neutrons are squeezed together by the gravitational force to very high densities. The experimental search for isolated multi-neutron systems has been an ongoing quest for several decades 1 , with a particular focus on the four-neutron system called the tetraneutron, resulting in only a few indications of its existence so far 2-4 , leaving the tetraneutron an elusive nuclear system for six decades. Here we report on the observation of a resonance-like structure near threshold in the four-neutron system that is consistent with a quasi-bound tetraneutron state existing for a very short time. The measured energy and width of this state provide a key benchmark for our understanding of the nuclear force. The use of an experimental approach based on a knockout reaction at large momentum transfer with a radioactive high-energy 8 He beam was key., (© 2022. The Author(s).)

Published
2022
Full Text
View/download PDF

49. Thermal atomic layer deposition of In 2 O 3 thin films using a homoleptic indium triazenide precursor and water.

Author

Mpofu P, Rouf P, O'Brien NJ, Forsberg U, and Pedersen H

Abstract

Indium oxide (In 2 O 3 ) is an important transparent conducting material widely used in optoelectronic applications. Herein, we study the deposition of In 2 O 3 by thermal atomic layer deposition (ALD) using our recently reported indium(III) triazenide precursor and H 2 O. A temperature interval with self-limiting growth was found between ∼270 and 385 °C with a growth per cycle of ∼1.0 Å. The deposited films were polycrystalline cubic In 2 O 3 with In : O ratios of 1 : 1.2, and low levels of C and no detectable N impurities. The transmittance of the films was found to be >70% in visible light and the resistivity was found to be 0.2 mΩ cm. The high growth rates, low impurities, high optical transmittance, and low resistivity of these films give promise to this process being used for ALD of In 2 O 3 films for future microelectronic displays.

Published
2022
Full Text
View/download PDF

50. Interdialytic weight gain of less than 2.5% seems to limit cardiac damage during hemodialysis.

Author

Goto J, Forsberg U, Jonsson P, Matsuda K, Nilsson B, Nilsson Ekdahl K, Henein MY, and Stegmayr BG

Subjects
Biomarkers, Humans, Renal Dialysis adverse effects, Weight Gain, Kidney Failure, Chronic
Abstract

Aims: To investigate if a single low-flux HD induces a rise in cardiac biomarkers and if a change in clinical approach may limit such mechanism., Material and Methods: A total of 20 chronic HD patients each underwent three different study-dialyses. Dialyzers (low-flux polysulfone, 1.8 sqm) had been stored either dry or wet (Wet) and the blood level in the venous chamber kept low or high. Laboratory results were measured at baseline, 30 and 180 min, adjusted for the effect of fluid shift. Ultrasound measured microemboli signals (MES) within the return line., Results: Hemodialysis raised cardiac biomarkers ( p  < 0.001): Pentraxin 3 (PTX) at 30 min (by 22%) and at 180 min PTX (53%), Pro-BNP (15%), and TnT (5%), similarly for all three HD modes. Baseline values of Pro-BNP correlated with TnT (rho = 0.38, p  = 0.004) and PTX (rho = 0.52, p  < 0.001). The changes from pre- to 180 min of HD ( delta -) were related to baseline values (Pro-BNP: rho = 0.91, p  < 0.001; TnT: rho = 0.41, p  = 0.001; PTX: rho = 0.29, p  = 0.027). Delta Pro-BNP (rho = 0.67, p  < 0.001) and TnT (rho = 0.38, p  = 0.004) correlated with inter-dialytic-weight-gain (IDWG). Biomarkers behaved similarly between the HD modes. The least negative impact was with an IDWG ⩽ 2.5%. Multiple regression analyses of the Wet-High mode does not exclude a relation between increased exposure of MES and factors such as release of Pro-BNP., Conclusion: Hemodialysis, independent of type of dialyzer storage, was associated with raised cardiac biomarkers, more profoundly in patients with higher pre-dialysis values and IDWG. A limitation in IDWG to <2.5% and prolonged ultrafiltration time may limit cardiac strain during HD, especially in patients with cardiovascular risk.

Published
2021
Full Text
View/download PDF

Catalog

Books, media, physical & digital resources
See catalog results