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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

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