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1. Detailed study of Rf and No isotopes radioactive decay properties

Author

M. S. Tezekbayeva, A. V. Yeremin, O. N. Malyshev, M. L. Chelnokov, V. I. Chepigin, A. V. Isaev, A. V. Karpov, A. A. Kuznetsova, A. G. Popeko, Yu. A. Popov, A. I. Svirikhin, E. A. Sokol, A. .. Lopez-Martens, K. .. Hauschild, O. .. Dorvaux, B. .. Gall, P. .. Mosat, and B. S. Sailaubekov

Subjects
no and rf isotopes, radioactive decay, complete fusion reactions, excited compound nucleus, Physics, QC1-999
Abstract

The experiments of detailed study of No and Rf isotopes radioactive decay properties in complete fusion reactions50Ti+208Pb and48Ca+208,206,204Pb with subsequent neutron evaporation from the excited compound nucleus at the kinematic separator SHELS were performed in FLNR JINR. The data of the256Rf decay properties and preliminary data of250No decay properties are presented.

Published
2021
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3. Alpha-decay spectroscopy of $^{257}$Rf

Author

K. Hauschild, A. Lopez-Martens, R. Chakma, M. L. Chelnokov, V. I. Chepigin, A. V. Isaev, I. N. Izosimov, D. E. Katrasev, A. A. Kuznetsova, O. N. Malyshev, A. G. Popeko, Yu. A. Popov, E. A. Sokol, A. I. Svirikhin, M. S. Tezekbayeva, A. V. Yeremin, Z. Asfari, O. Dorvaux, B. J. P. Gall, K. Kessaci, D. Ackermann, J. Piot, P. Mosat, B. Andel, Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), Département Recherches Subatomiques (DRS-IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)-Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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
Nuclear and High Energy Physics, 010308 nuclear & particles physics, 0103 physical sciences, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Nuclear Experiment
Abstract

The decay properties of the ground state and excited states of $^{257}$Rf have been investigated with the detector array GABRIELA at the FLNR, Dubna. The electromagnetic decay of a new excited state in $^{253}$No has been observed. The state lies 750 keV above the ground state and is favourably populated in the alpha decay of the low-lying spin isomer of $^{257}$Rf. It decays to the 9/2$^-$ ground state by an M1 transition and is assigned the 11/2$^-$[725] Nilsson configuration. The presence of this state suggests a possible reinterpretation of the decay of the high-K isomer in $^{253}$No., Comment: 7 pages, 4 figures

Published
2021
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4. Measurement of proton-evaporation rates in fusion reactions leading to transfermium nuclei

Author

A. V. Isaev, J. Piot, A. A. Kuznetsova, M. L. Chelnokov, M.V. Gustova, A. Lopez-Martens, O. N. Malyshev, Dieter Ackermann, O. Dorvaux, A. G. Popeko, L. Caceres, H. Savajols, B. J. P. Gall, Zouhair Asfari, K. Rezynkina, V. I. Chepigin, Patrick Steinegger, K. Hauschild, E. A. Sokol, M. S. Tezekbayeva, A. V. Karpov, A. V. Yeremin, A. I. Svirikhin, Yu. A. Popov, P. Brionnet, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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 Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), Université de Strasbourg (UNISTRA)-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)-Centre National de la Recherche Scientifique (CNRS), and Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear and High Energy Physics, Proton, Fission, Super heavy nuclei, Fusion-evaporation reaction, Nuclear Theory, Evaporation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Molecular physics, 0103 physical sciences, Nuclear fusion, Neutron, 010306 general physics, Nuclear Experiment, Proton evaporation, Physics::Atmospheric and Oceanic Physics, Spontaneous fission, Physics, Millisecond, Cross section, 010308 nuclear & particles physics, lcsh:QC1-999, Excitation, lcsh:Physics
Abstract

The analysis of fission events following the implantation of evaporation residues produced in the fusion reaction of 50Ti and 209Bi at different bombarding energies has revealed 5 millisecond decays, which are attributed to the spontaneous fission of proton-evaporation channels. The average cross sections for proton evaporation are found to be ∼100 and 10 times smaller than the largest neutron-evaporation channel cross section at the same excitation energy. These results suggest that the proton evaporation channel, albeit weak, may represent a realistic alternative to synthesize new, more neutron rich super heavy nuclei. Keywords: Fusion-evaporation reaction, Proton evaporation, Super heavy nuclei, Cross section

Published
2019
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5. New front and back-end electronics for the upgraded GABRIELA detection system

Author

D. E. Katrasev, D. Linget, K. Kessaci, A. N. Kuznetsov, M. S. Tezekbayeva, C. Mathieu, A. V. Isaev, B. Gall, K. Rezynkina, O. N. Malyshev, E. A. Sokol, L. Gibelin, P. Brionnet, A. A. Kuznetsova, O. Dorvaux, K. Hauschild, R. Chakma, A. V. Yeremin, V. Alaphillipe, N. Karkour, Yu. A. Popov, V. I. Chepigin, A. G. Popeko, A. I. Svirikhin, A. Lopez-Martenz, M. L. Chelnokov, Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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 Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Engineering, Physics - Instrumentation and Detectors, business.industry, Electrical engineering, FOS: Physical sciences, focal plane decay spectroscopy, Instrumentation and Detectors (physics.ins-det), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Digital signal processing, digital electronics, Electronics, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], Nuclear Experiment (nucl-ex), particle discrimination, business, Nuclear Experiment, Front (military)
Abstract

The GABRIELA [1] set-up is used at the FLNR to perform detailed nuclear structure studies of transfermium nuclei. Following the modernization of the VASSILISSA separator (SHELS) [2] the GABRIELA detection system has also been upgraded. The characteristics of the upgraded detection system will be presented along with results from some recent electronics tests., Comment: 6 pages, 3 figure, 1 table uncorrected pre-print of EXON 2018 conference proceedings

Published
2018
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6. The study of the properties of spontaneously fissioning transfermium nuclei synthesized in the complete fusion reactions with heavy ions

Author

A. V. Isaev, A. V. Andreev, Y. A. Popov, M. L. Chelnokov, D. Tonev, P. Mosat, V. I. Chepigin, O. N. Malyshev, E. A. Stefanova, A. G. Popeko, Z. Kalaninová, K. Rezynkina, I. N. Izosimov, M. Z. Asfari, A. I. Svirikhin, Julien Piot, K. Hauschild, A. Lopez-Martenz, B. Andel, A. N. Kuznetsov, A. V. Yeremin, M. S. Tezekbayeva, E. A. Sokol, T. M. Schneidman, O. Dorvaux, B. J. P. Gall, A. A. Kuznetsova, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Université de Haute-Alsace (UHA) Mulhouse - Colmar (Université de Haute-Alsace (UHA))-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), Université de Strasbourg (UNISTRA)-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, History, 010308 nuclear & particles physics, TheoryofComputation_ANALYSISOFALGORITHMSANDPROBLEMCOMPLEXITY, 0103 physical sciences, Radiochemistry, Nuclear fusion, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Computer Science Applications, Education, Ion
Abstract

This report describes a series of experiments aimed on investigating characteristics of spontaneous fission of nuclei in the exotic region of short-lived neutron-deficient isotopes with Z ≥ 100. Unique data on the decay properties of neutron-deficient isotopes 244,246Fm, 250No, 252No, 254Rf and 256Rf produced in the complete fusion reactions with accelerated heavy ions 40Ar + 206,208Pb → 246,248Fm*, 48Ca + 204,206Pb → 252,254No*, 50Ti + 206,208Pb →256,258Rf* were obtained in experiments at the VASSILISSA (SHELS) separator combined with a neutron detector. This report describes a series of experiments aimed on investigating characteristics of spontaneous fission of nuclei in the exotic region of short-lived neutron-deficient isotopes with Z ≥ 100. Unique data on the decay properties of neutron-deficient isotopes 244,246Fm, 250No, 252No, 254Rf and 256Rf produced in the complete fusion reactions with accelerated heavy ions 40Ar + 206,208Pb → 246,248Fm*, 48Ca + 204,206Pb → 252,254No*, 50Ti + 206,208Pb →256,258Rf* were obtained in experiments at the VASSILISSA (SHELS) separator combined with a neutron detector. ispartof: 27TH INTERNATIONAL NUCLEAR PHYSICS CONFERENCE (INPC2019) vol:1643 ispartof: 27th International Nuclear Physics Conference (INPC) location:SCOTLAND, Glasgow date:29 Jul - 2 Aug 2019 status: published

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