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1. The New $^{249}$No Isotope

Author

M. S. Tezekbayeva, N. I. Zamyatin, A. G. Popeko, M. L. Chelnokov, P. Mosat, A. A. Kuznetsova, A. V. Isaev, I. N. Izosimov, E. A. Sokol, A. Bronis, K. Hauschild, B. Andel, R. S. Mukhin, B. S. Sailaubekov, O. Dorvaux, B. Gall, Y. A. Popov, O. N. Malyshev, V. I. Chepigin, A. Lopez-Martens, S. Antalic, A. V. Yeremin, A. I. Svirikhin, 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), Laboratoire de Physique des 2 Infinis Irène Joliot-Curie (IJCLab), and Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Saclay-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Fusion, Radiation, Isotope, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Branching fraction, Analytical chemistry, Separator (oil production), 7. Clean energy, 01 natural sciences, Atomic and Molecular Physics, and Optics, Decay energy, 0103 physical sciences, Radiology, Nuclear Medicine and imaging, Detector array, 010306 general physics, Line (formation)
Abstract

International audience; In the reaction of complete fusion of $^{48}$Ca-ions with a $^{204}$Pb target, a new α line, related to the decay of a new, previously unknown isotope ($^{249}$No), has been detected in an experiment carried out at the SHELS separator. The α decay energy (E$_{α}$ = 9129 keV) and the half-life (T$_{1/2}$ = 38.1 ± 2.5 ms) are measured using the GABRIELA detector array. The SF branching ratio was estimated (b$_{SF}$ ≤ 0.2%).

Published
2021
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2. Prompt Neutrons from Spontaneous $^{254}$Rf Fission

Author

A. N. Kuznetsov, A. V. Isaev, P. Mosat, B. M. Retailleau, O. Dorvaux, B. Andel, T. M. Schneidman, I. N. Izosimov, A. G. Popeko, A. Lopez-Martenz, M. L. Chelnokov, S. Antalic, A. V. Yeremin, Elka Stefanova, A. Bronis, A. V. Andreev, A. I. Svirikhin, A. A. Kuznetsova, B. Gall, V. I. Chepigin, Y. A. Popov, D. Tonev, M. S. Tezekbayeva, E. A. Sokol, K. Hauschild, O. N. Malyshev, P. Chauveau, N. I. Zamyatin, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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), 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
Physics, Nuclear reaction, Nuclear and High Energy Physics, Radiation, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, Branching fraction, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Atomic and Molecular Physics, and Optics, Ion, Nuclear physics, Prompt neutron, 0103 physical sciences, Nuclear fusion, Radiology, Nuclear Medicine and imaging, Multiplicity (chemistry), Nuclear Experiment, 010306 general physics, Spontaneous fission
Abstract

International audience; The neutron yield from the spontaneous fission of the short-lived neutron-deficient$^{254}$Rf nucleus produced in the complete fusion reaction with the beam of multiply charged ions from the U400 accelerator at the Flerov Laboratory of Nuclear Reactions (FLNR), Joint Institute for Nuclear Research (JINR), is measured using the combined detection system of the SHELS velocity filter. The half-life and the branching ratio of$^{254}$Rf are also measured. The data on the multiplicity of prompt neutrons from spontaneous fission of$^{256}$Rf ($\bar {\nu }$ = 3.87 ± 0.34) are presented for the first time.

Published
2019
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3. Investigation of the Spontaneous Fission Properties of Neutron-Deficient Nobelium Isotopes

Author

A. Sellam, A. Lopez-Martenz, P. Brionnet, O. Dorvaux, B. Gall, T. M. Schneidman, I. N. Izosimov, A. A. Kuznetsova, V. I. Chepigin, K. Rezynkina, P. Mosat, O. N. Malyshev, A. N. Kuznetsov, S. M. Mullins, Yu. A. Popov, A. I. Svirikhin, K. Hauschild, A. V. Andreev, E. A. Sokol, M. L. Chelnokov, A. V. Yeremin, A. V. Isaev, A. G. Popeko, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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), 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
Physics, Nuclear and High Energy Physics, Neutron multiplicity, Radiation, fission fragment, Physics and Astronomy (miscellaneous), Isotope, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], Materials Science (miscellaneous), Radiochemistry, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Condensed Matter Physics, 7. Clean energy, lcsh:QC1-999, chemistry, spontaneous fission, Neutron, Nobelium, Nuclear Experiment, lcsh:Physics, Spontaneous fission
Abstract

International audience; In the last years we carried out several experiments aimed to investigate properties of short-lived SF isotopes. The neutron-deficient isotopes of nobelium were produced in fusion-evaporation reactions using 206,208Pb targets and an intense 48Ca-beam. Fusionevaporation residues were separated by the SHELS separator and implanted into a largearea double-sided 48×48 strip silicon detector surrounded by 3He-based neutron counters. Half-lives and decay branching ratios for 252,254No isotopes were measured. The average number of neutrons per spontaneous fission of 254No determined for the first time.

Published
2018
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4. 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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5. Determination of Fusion Barrier Distributions from Quasielastic Scattering Cross Sections towards Superheavy Nuclei Synthesis

Author

J. Kanaya, Masato Asai, Shinya Yanou, Hiromitsu Haba, Hugo Faure, Shoya Yamamoto, Yukiko Komori, S. Yamaki, K. Tanaka, Kenyu Watanabe, Atsushi Yoshida, Hiroo Hasebe, T. Tanaka, Mirei Takeyama, B. Gall, Yoshihiro Narikiyo, Takayuki Yamaguchi, Masashi Murakami, Yuki Yamano, Kunihiro Fujita, Kouji Morimoto, Shin Ichi Goto, Akira Yoneda, Kosuke Morita, Daiya Kaji, Satoshi Ishizawa, Tomomi Yoshida, Yasuo Wakabayashi, Kenji Katori, Ryuji Aono, Kouichi Hagino, Zouhair Asfari, Minghui Huang, Fuyuki Tokanai, Department of Information and Sciences. (DIS), Tokyo Denki University, Okayama University, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), Department of Physics, and Tohoku University [Sendai]

Subjects
Nuclear reaction, Elastic scattering, Physics, [PHYS]Physics [physics], Quasielastic scattering, 010308 nuclear & particles physics, Scattering, Nuclear Theory, General Physics and Astronomy, 01 natural sciences, 7. Clean energy, Molecular physics, symbols.namesake, Recoil, 0103 physical sciences, symbols, Nuclear fusion, Neutron, Rutherford scattering, Nuclear Experiment, 010306 general physics, ComputingMilieux_MISCELLANEOUS
Abstract

In order to study the nucleus–nucleus interactions for syntheses of superheavy nuclei, we measured excitation functions for the quasielastic scattering of 48Ca+208Pb, 50Ti+208Pb, and 48Ca+248Cm using the gas-filled-type recoil ion separator GARIS. The quasielastic scattering events were clearly separated from deep-inelastic events by using GARIS and its focal plan detectors, except for high-incident-energy points. The quasielastic barrier distributions were successfully extracted for these systems, and compared with coupled-channels calculations. The results of the calculations indicate that vibrational and rotational excitations of the colliding nuclei, as well as neutron transfers before contact, strongly affect the structure of the barrier distribution. For the reactions of 48Ca+208Pb and 50Ti+208Pb, a local maximum of the barrier distribution occurred at the same energy as the peak of the 2n evaporation cross section of the system. On the other hand, for the hot fusion reaction of 48Ca+248Cm, the 4n e...

Published
2018
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6. Short-Lived Isotopes of Transfermium Elements: Studying Characteristics of Spontaneous Fissioning

Author

B. Andel, P. Mosat, Z. Kalaninová, O. Dorvaux, A. Lopez-Martenz, K. Rezynkina, M. Z. Asfari, B. Gall, E. A. Sokol, M. L. Chelnokov, N. Yoshihiro, A. V. Yeremin, T. M. Schneidman, A. N. Kuznetsov, I. N. Izosimov, V. I. Chepigin, A. V. Andreev, O. N. Malyshev, Y. A. Popov, D. Tonev, S. M. Mullins, A. I. Svirikhin, J. Piot, A. A. Kuznetsova, A. V. Isaev, K. Hauschild, P. Brione, A. G. Popeko, Peter B. Jones, Elka Stefanova, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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), 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), 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 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
Nuclear reaction, Physics, Isotope, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, Hadron, General Physics and Astronomy, Kinetic energy, 01 natural sciences, 7. Clean energy, Ion, Nuclear physics, 0103 physical sciences, Nuclear fusion, Neutron, 010306 general physics
Abstract

series of experiments performed in 2014–2015 using the SHELS separator and a beam of multicharged ions from the U-400 accelerator at the Flerov Laboratory of Nuclear Reactions (Joint Institute for Nuclear Research) in Dubna is described. In preparation for a large program of experiments with a beam of highly charged ions of 50Ti, an experiment is performed to study the spontaneous fissioning (SF) of short-lived neutron-deficient isotope 256Rf formed in complete fusion reaction50Ti + 208Pb = 256Rf + 2n. The half-life of 256Rf is measured along with the probability of its SF decay. The average number of neutrons per one event of 256Rf SF ( $$\bar v$$ = 4.47 ± 0.09) is obtained for the first time. The results from experiments to study the SF of short-lived neutron-deficient isotopes synthesized in complete fusion reaction 48Ca + 204Pb → 252No* are presented as well. Two short-lived activities attributed to the SF of the ground and isomeric states of 250No are revealed. The half-life, total kinetic energies of fission fragments, and neutron multiplicities are measured for the obtained short-lived nuclei. The average numbers of neutrons per one SF event are $$\bar v$$ = 4.38 ± 0.13 and $$\bar v$$ = 3.90 ± 0.20, respectively, for SF activity with t1/2 = 5.1 ± 0.3 and t1/2 = 36 ± 3 μs.

Published
2018
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7. Characteristics of spontaneous fission of $^{250}$No

Author

E. A. Sokol, K. Rezynkina, A. N. Kuznetsov, M. L. Chelnokov, A. Lopez-Martenz, P. Brione, O. N. Malyshev, A. V. Isaev, Y. A. Popov, S. M. Mullins, Peter B. Jones, A. A. Kuznetsova, A. V. Yeremin, A. V. Andreev, O. Dorvaux, P. Mosat, T. M. Schneidman, I. N. Izosimov, B. Gall, V. I. Chepigin, A. I. Svirikhin, A. G. Popeko, K. Hauschild, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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), 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
Physics, Nuclear and High Energy Physics, Cold fission, Radiation, Cluster decay, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Fission, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Kinetic energy, 7. Clean energy, 01 natural sciences, Atomic and Molecular Physics, and Optics, Ion, Nuclear physics, medicine.anatomical_structure, 0103 physical sciences, medicine, Radiology, Nuclear Medicine and imaging, Neutron, 010306 general physics, Nucleus, Spontaneous fission
Abstract

This study describes an experiment on investigating the properties of spontaneous fission of shortlived neutron-deficient nuclei synthesized in the reaction of complete fusion 48Ca + 204Pb = 252No*. The experiment is performed using the SHELS separator and the beam of multicharged ions at U-400 accelerator (LNR, JINR). Two activities undergoing spontaneous fission, which can be related to the ground and isomeric states of 250No nucleus, are registered. The half-lives, total kinetic energies of fission fragments, and neutron multiplicities are measured for the short-lived nuclei. The average number of neutrons per fission for the activity with t 1/2 = 5.1 ± 0.3 μs is = 4.38 ± 0.13 μs, and for nuclei with the half-life t 1/2 = 36 ± 3 μs it is xxxxx.

Published
2017
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8. SPONTANEOUS FISSION OF $^{256}$Rf AND $^{250}$No — NEW EXPERIMENTAL DATA

Author

B. Gall, A. V. Yeremin, T. M. Schneidman, I. N. Izosimov, O. N. Malyshev, V. I. Chepigin, P. Brione, A. V. Andreev, E. A. Sokol, P. Mosat, M. L. Chelnokov, A. A. Kuznetsova, P. Jones, A. N. Kuznetsov, K. Hauschild, A. Lopez-Martens, S. Mullins, K. Rezynkina, A. I. Svirikhin, Y. A. Popov, A. V. Isaev, A. G. Popeko, O. Dorvaux, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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), 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
Nuclear physics, Materials science, Silicon, chemistry, Isotope, Branching fraction, Fission, chemistry.chemical_element, Neutron, Transfermium nuclei, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Excitation, Spontaneous fission
Abstract

International audience; In the last years we carried out several experiments aimed to investigate properties of short-lived SF isotopes. The neutron-deficient isotope 256Rf were produced in fusion-evaporation reactions using an 208Pb target and an intense 50Ti beam. Fusion-evaporation residues were separated by the SHELS separator (FLNR, Dubna) and implanted into a large-area double-sided silicon 48×48 strip detector surrounded by 3He-based neutron counters. The half-life and decay branching ratio of 256Rf is measured. The average number of neutrons per spontaneous fission of 256Rf is determined for the first time. Next we carried out an experiment aimed at investigating the properties of spontaneous fission of neutron deficient isotope 250No produced in the reaction with 48Cabeam and 204Pb-target. Earlier two spontaneous fission half-lives (t1/2 = 5.1±0.3 μs and t1/2 = 36±3 μs) originate from 250No were registered. The obtained excitation functions after the evaporation of 2 neutrons from the compound 252No nuclei have been compared with similar data obtained earlier. From the experimental data for the first time the average number of neutrons per spontaneous fission and TKE-spectra of fission fragments of both 250No activities was determined.

Published
2016
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9. Spontaneous Fission of $^{256}$Rf, New Data

Author

A. N. Kuznetsov, A. V. Isaev, A. I. Svirikhin, M. L. Chelnokov, A. V. Yeremin, Yu. A. Popov, I. N. Izosimov, E. A. Sokol, O. N. Malyshev, Z. Kalaninova, B. Andel, N. Yoshihiro, D. Tonev, M. Z. Asfari, S. M. Mullins, J. Piot, B. Gall, V. I. Chepigin, Elka Stefanova, A. G. Popeko, Institut Pluridisciplinaire Hubert Curien (IPHC), Université de Strasbourg (UNISTRA)-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), 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)-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, Nuclear Theory, Cyclotron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, law.invention, Ion, Nuclear physics, law, 0103 physical sciences, Nuclear fusion, Radiology, Nuclear Medicine and imaging, Neutron, Nuclear Experiment, 010306 general physics, Spontaneous fission, Physics, Radiation, Cluster decay, 010308 nuclear & particles physics, Branching fraction, Atomic and Molecular Physics, and Optics, High Energy Physics::Experiment, Atomic physics, Bar (unit)
Abstract

International audience; Spontaneous fission properties of the short-lived neutron-deficient 256Rf nucleus produced in thecomplete fusion reaction with a beam of multiply charged heavy 50Ti ions from the U-400 cyclotron (FLNR,JINR) are experimentally investigated. Its half-life and decay branching ratio are measured. The averagenumber of neutrons per spontaneous fission of 256Rf ( = 4.47 ± 0.09) is determined for the first time.

Published
2016
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10. Stability and synthesis of superheavy elements: Fighting the battle against fission – example of $^{254}$No

Author

Andreas Martin Heinz, S. Zhu, G. Henning, B. Gall, S. Lakshmi, A. V. Karpov, N. Rowley, M. P. Carpenter, G. Gurdal, B. P. Kay, Calem Hoffman, P. F. Bertone, A. Lopez-Martens, Martín Alcorta, D. Boilley, Paul Greenlees, D. H. Potterveld, C. J. Lister, R. V. F. Janssens, T. L. Khoo, E. A. McCutchan, C. J. Chiara, C. Nair, J. Piot, P. Reiter, A. M. Rogers, F. G. Kondev, P. Chowdhury, K. Hauschild, T. Lauristen, D. Seweryniak, M. Asai, B. B. Back, 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), Normandie Université (NU), 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 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), Rudolph, Dirk, 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
Fission, QC1-999, Nuclear Theory, Shell (structure), nuclear stability, Superheavy Elements, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Stability (probability), Nuclear physics, 0103 physical sciences, medicine, Physics::Atomic and Molecular Clusters, 010306 general physics, Nuclear Experiment, Quantum, Spontaneous fission, Physics, nobelium, ta114, 010308 nuclear & particles physics, fission barrier, superheavy elements, medicine.anatomical_structure, Atomic physics, Nucleus
Abstract

International audience; Superheavy nuclei exist solely due to quantum shell effects,which create a pocket in the potential-energy surface of the nucleus, thusproviding a barrier against spontaneous fission. Determining the height ofthe fission barrier and its angular-momentum dependence is important toquantify the role that microscopic shell corrections play in enhancing andextending the limits of nuclear stability. In this talk, the first measurement ofa fission barrier in the very heavy nucleus 254No will be presented.

Published
2016
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11. Toward the drip lines and the superheavy island of stability with the Super Separator Spectrometer S3

Author

A. Drouart, B. Gall, F. Le Blanc, Jerry Nolen, H. Savajols, J. Payet, Didier Uriot, A. Hue, S. Manikonda, O. Delferriere, M. Authier, A. M. Amthor, B. Laune, E. Traykov, F. Dechery, M.-H. Stodel, D. Boutin, 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), 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), Argonne National Laboratory [Lemont] (ANL), Bucknell University, 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), AML Superconductivity and Magnetics, S3, Université de Strasbourg (UNISTRA)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), 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 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)

Subjects
Physics, Nuclear and High Energy Physics, Electromagnet, Spectrometer, 010308 nuclear & particles physics, Superconducting magnet, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Particle detector, Linear particle accelerator, law.invention, Nuclear physics, law, 0103 physical sciences, Measuring instrument, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 010306 general physics, Multipole expansion, Magnetic dipole
Abstract

The Super Separator Spectrometer S 3 is a major experimental system developed for SPIRAL2. It has been designed for physics experiments with very low cross sections by taking full advantage of the very high intensity stable beams to be produced by LINAG, the superconducting linear accelerator at GANIL. These intensities will open new opportunities in several physics domains using fusion evaporation reactions, principally: super-heavy and very heavy element properties, spectroscopy at and beyond the dripline, and isomer and ground-state properties. The common feature of these experiments is the requirement to separate very rare events from intense backgrounds. S 3 accomplishes this with a large acceptance, a high background rejection efficiency, and a physical mass separation. This article will present the technical specifications and optical constraints needed to achieve these physical goals. The optical layout of the spectrometer will be presented, focusing on technical elements of the target system, the superconducting multipole magnets used to correct high-order optical aberrations, the electric and magnetic dipoles, and the open multipole triplet used for primary beam rejection. The expected system performance will be presented for three experimental cases using 3 specific optical modes of the spectrometer.

Published
2015
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12. First experimental tests of the kinematic separator SHELS (Separator for Heavy ELement Spectroscopy)

Author

B. Gall, O. Dorvaux, A. V. Yeremin, V. I. Chepigin, O. N. Malyshev, K. Hauschild, A. Lopez-Martens, A. G. Popeko, A. I. Svirikhin, J. Gehlot, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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)-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 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), Département Recherches Subatomiques (DRS-IPHC), Institut Pluridisciplinaire Hubert Curien (IPHC), 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)-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
Nuclear reaction, ELECTRON-SPECTROSCOPY, [PHYS]Physics [physics], NUCLEI, Chemistry, Physics, QC1-999, Nuclear Theory, Separator (oil production), Kinematics, GAMMA, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], FLNR JINR, 7. Clean energy, Ion, Nuclear physics, Recoil, VASSILISSA PERFORMANCE, Nuclear fusion, Heavy element, Spectroscopy, Nuclear Experiment, DECAY
Abstract

International audience; Investigations of complete fusion reactions leading to the synthesis of heavy and superheavy nuclei have been an important part of the experimental program at the Flerov Laboratory of Nuclear Reactions (JINR, Dubna). For synthesis and decay studies of heavy nuclei, a project of modernization of the existing experimental set up VASSILISSA is now underway. The results of the first experimental tests with the modernized VASSILISSA separator are presented, in particular the experimentally measured transmission coefficients for recoil nuclei synthesized in asymmetric reactions with a Ne-22 beam. These results completely confirm the ion optical calculations performed during the design stage of the modernization.

Published
2014
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13. Fine structure in the alpha decay of $^{224}$U

Author

K. Hauschild, I. N. Izosimov, E. A. Sokol, D. E. Katrasev, A. N. Kuznetsov, O. Dorvaux, A. G. Popeko, F. Dechery, J. Piot, A. Lopez-Martens, A. A. Kuznetsova, O. N. Malyshev, K. Rezynkina, A. V. Isaev, B. Gall, V. I. Chepigin, M. L. Chelnokov, A. I. Svirikhin, A. V. Yeremin, J. Rubert, H. Faure, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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 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)-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), Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), Université Joseph Fourier - Grenoble 1 (UJF)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Centre National de la Recherche Scientifique (CNRS), 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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 Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Institut Polytechnique de Grenoble - Grenoble Institute of Technology-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Joseph Fourier - Grenoble 1 (UJF)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, Nuclear and High Energy Physics, Photon, Silicon, 010308 nuclear & particles physics, Hadron, chemistry.chemical_element, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Nuclear physics, chemistry, Coincident, Excited state, 0103 physical sciences, Nuclear fusion, Alpha decay, Atomic physics, 010306 general physics, Excitation
Abstract

224U nuclei were populated in fusion-evaporation reactions using a 206Pb target and an intense 22Ne beam. Fusion-evaporation residues were separated by the new separator SHELS at the FLNR, Dubna and implanted into a large-area double-sided silicon strip detector. Position- and time-correlated alpha decays were used to identify evaporation residues. A new $ \alpha$ -decay line at 8095(11) keV was observed in this work and assigned as the decay from 224U to the first excited 2+ in the daughter nucleus 220Th. Coincident photons were also observed allowing to unambiguously determine the excitation energy of the first excited 2+ state in 220Th to be 386.5(1) keV and not 373.3(1)keV as previously reported. The half-life of 224U was measured to be 396(17)μs.

Published
2014
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14. Exploring the stability of super heavy elements: First Measurement of the Fission Barrier of $^{254} $No

Author

David Boilley, J. Piot, K. Hauschild, D. H. Potterveld, T. Lauristen, T. L. Khoo, F. G. Kondev, S. Zhu, M. Asai, E. A. McCutchan, G. Henning, C. J. Chiara, C. J. Lister, P. Reiter, Andreas Martin Heinz, C. Nair, A. M. Rogers, N. Rowley, Martín Alcorta, M. P. Carpenter, B. P. Kay, A. Lopez-Martens, Calem Hoffman, G. Gurdal, P. F. Bertone, B. B. Back, P. Chowdhury, B. Gall, S. Lakshmi, A. V. Karpov, R. V. F. Janssens, D. Seweryniak, Paul Greenlees, 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), CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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 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)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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), Université de Caen Normandie (UNICAEN), Normandie Université (NU), 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11)-Centre de Sciences Nucléaires et de Sciences de la Matière (CSNSM), 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 National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), 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), Lunardi, S., Bizzeti, P.G., Kabana, Sonia, Bucci, C., Chiari, M., Dainese, A., Nezza, P. Di, Menegazzo, R., Nannini, A., Signorini, C., and Valiente-Dobon, J.J.

Subjects
Physics, ta114, Fission, heavy elements, QC1-999, Nuclear Theory, fission barrier, Transactinide element, stability, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Nuclear physics, medicine.anatomical_structure, medicine, Nuclear structure, Multiplicity (chemistry), Total energy, Atomic physics, Nuclear Experiment, Saturation (magnetic), Nucleus, Excitation, ComputingMilieux_MISCELLANEOUS
Abstract

The gamma-ray multiplicity and total energy emitted by the heavy nucleus 254No have been measured at 2 different beam energies. From these measurements, the initial distributions of spin I and excitation energy E * of 254No were constructed. The distributions display a saturation in excitation energy, which allows a direct determination of the fission barrier. 254No is the heaviest shell-stabilized nucleus with a measured fission barrier. © Owned by the authors, published by EDP Sciences, 2014.

Published
2013
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15. Spectroscopy of transfermium nuclei using the GABRIELA set up at the focal plane of the VASSILISSA recoil separator

Author

K. Hauschild, A. Lopez-Martens, O. Dorvaux, J. Piot, D. Curien, B. Gall, A. V. Yeremin, M. L. Chelnokov, V. I. Chepigin, A. V. Isaev, I. N. Izosimov, A. P. Kabachenko, D. E. Katrasev, A. N. Kuznetsov, O. N. Malyshev, A. G. Popeko, E. A. Sokol, A. I. Svirikhin, T. Wiborg-Hagen, H. T Nyhus, S. Siem, G. Drafta, D. Pantelica, N. Scintee, A. Görgen, T. Kutsarova, S. Mullins, Š. Šáro, Hajime Susa, Marcel Arnould, Sydney Gales, Tohru Motobayashi, Christoph Scheidenberger, Hiroaki Utsunomiya, CSNSM SNO, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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)-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 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), 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
separation, 0202 electrical engineering, electronic engineering, information engineering, electrons, nuclear energy levels, 020206 networking & telecommunications, 020201 artificial intelligence & image processing, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, nuclear fusion
Abstract

International audience; An IN2P3‐JINR collaboration has launched a project called GABRIELA at the Flerov Laboratory for Nuclear Reactions (FLNR) within the Joint Institute for Nuclear Research (JINR) in Dubna (Russia). The goal of the project is to perform gamma‐ray and internal conversion electron spectroscopy of heavy nuclei produced in fusion‐evaporation reactions and transported to the focal plane of the recoil separator VASSILISSA. During five experimental campaigns of GABRIELA, the detection system has gained in sensitivity and new spectroscopic information has been obtained for 249Fm, 251Fm, 253No and 255Lr. In this contribution new results for 253No will be discussed. © 2010 American Institute of Physics

Published
2009
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16. Discovery of the proton emitting nucleus $^{159}$Re

Author

D. T. Joss, I. G. Darby, R. D. Page, J. Uusitalo, S. Eeckhaudt, T. Grahn, P. T. Greenlees, P. M. Jones, R. Julin, S. Juutinen, S. Ketelhut, M. Leino, A.-P. Leppänen, M. Nyman, J. Pakarinen, P. Rahkila, J. Sarén, C. Scholey, A. N. Steer, J. S. Al-Khalili, A. J. Cannon, P. D. Stevenson, S. Ertürk, B. Gall, B. Hadinia, M. Venhart, J. Simpson, Lídia S. Ferreira, Paramasivan Arumugan, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Lídia S. Ferreira, Paramasivan Arumugan, Joss, D.T., Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom, STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom -- Darby, I.G., Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Page, R.D., Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Uusitalo, J., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Eeckhaudt, S., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Grahn, T., Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Greenlees, P.T., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Jones, P.M., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Julin, R., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Juutinen, S., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Ketelhut, S., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Leino, M., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Leppänen, A.-P., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Nyman, M., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Pakarinen, J., Oliver Lodge Laboratory, University of Liverpool, Liverpool, L69 7ZE, United Kingdom -- Rahkila, P., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Sarén, J., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Scholey, C., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Steer, A.N., Department of Physics, University of Jyväskylä, PO Box 35, FIN-40014, Jyväskylä, Finland -- Al-Khalili, J.S., Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom -- Cannon, A.J., Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom -- Stevenson, P.D., Department of Physics, University of Surrey, Guildford, GU2 7XH, United Kingdom -- Ertürk, S., Nigde Universitesi, Fen-Edebiyat Falkültesi, Fizik Bölümü, Nigde, Turkey -- Gall, B., ULP Strasbourg, 23 rue du Loess, 67037 Strasbourg Cedex 2, France -- Hadinia, B., Department of Physics, Royal Institute of Technology, SE-10691, Stockholm, Sweden -- Venhart, M., Department of Nuclear Physics and Biophysics, Comenius University, Mlynska Dolina, 842 48, Bratislava 4, Slovakia -- Simpson, J., STFC Daresbury Laboratory, Daresbury, Warrington, WA4 4AD, United Kingdom, and 0-Belirlenecek

Subjects
Si detectors, nuclear spin, Measured E p, Proton, Hadron, 02 engineering and technology, rhenium, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Nuclear physics, Isotopes of cadmium, 0202 electrical engineering, electronic engineering, information engineering, nuclei with mass number 150 to 189, Enriched targets, radioactive decay periods, Nuclide, Isotope, Chemistry, Nuclear structure, 020206 networking & telecommunications, T1/2, 13. Climate action, 020201 artificial intelligence & image processing, 23.50.+z, 27.70.+q, 21.10.Tg, 21.10.Hw, Gas-filled recoil separator, Nucleon, Radioactive decay, Nuclear reactions 58Ni + 106Cd at 300 MeV beam energy, proton emission decay
Abstract

Fund. para Cienc. Tecnol., FCT, Minist. Cienc. Tecnol.;Fundacao Calouste Gulbenkian;Fundacao Luso-Americana, International Conference on Proton Emitting Nuclei and Related Topics, PROCON 2007 -- 17 June 2007 through 23 June 2007 -- Lisbon, The observation of the new nuclide 159Re provides important insights into the evolution of single-particle structure in heavy nuclei beyond the proton drip line. The nuclide 159Re was synthesised in the reaction 106Cd(58Ni, p4n) and identified via its proton radioactivity using the RITU gas-filled separator and the GREAT focal-plane spectrometer. Comparisons of the measured proton energy (Ep = 1805±20 keV) and decay half-life (t1/2 = 21±4 µs) with values calculated using the WKB method indicate that the proton is emitted from an h11/2 state. The implications of these results for future experimental investigations into even more proton unbound Re isotopes using in-flight separation techniques are considered. © 2007 American Institute of Physics.

Published
2007
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17. Probing single-particle structures beyond the proton drip line

Author

R. D. Page, L. Bianco, I. G. Darby, D. T. Joss, T. Grahn, R.-D. Herzberg, J. Pakarinen, J. Thomson, J. Uusitalo, S. Eeckhaudt, P. T. Greenlees, P. M. Jones, R. Julin, S. Juutinen, S. Ketelhut, M. Leino, A.-P. Leppänen, M. Nyman, P. Rahkila, J. Sarén, C. Scholey, A. Steer, M. Venhart, J. Simpson, J. S. Al-Khalili, A. J. Cannon, P. D. Stevenson, S. Ertürk, B. Gall, B. Hadinia, Lídia S. Ferreira, Paramasivan Arumugan, Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Lídia S. Ferreira, Paramasivan Arumugan, Ferreira, LS, Arumugam, P, Scholey, Catherine -- 0000-0002-8743-6071, Stevenson, Paul -- 0000-0003-2645-2569, Pakarinen, Janne -- 0000-0001-8944-8757, Grahn, Tuomas -- 0000-0002-6255-2279, Jones, Pete -- 0000-0001-7480-6603, and [Page, R. D. -- Bianco, L. -- Darby, I. G. -- Joss, D. T. -- Grahn, T. -- Herzberg, R. -D. -- Pakarinen, J. -- Thomson, J.] Univ Liverpool, Dept Phys, Oliver Lodge Lab, Liverpool L69 7ZE, Merseyside, England -- [Uusitalo, J. -- Eeckhaud, S. -- Greenlees, P. T. -- Jones, P. M. -- Julin, R. -- Juutinen, S. -- Ketelhut, S. -- Leino, M. -- Leppanen, A. -P. -- Nyman, M. -- Rahkila, P. -- Saren, J. -- Scholey, C. -- Steer, A. -- Venhart, M.] Univ jyvaskyla, Dept Phys, FIN-40014 Jyvaskyla, Finland -- [Simpson, J.] STFC, Daresbury Lab, Warrington WA4 4AD, Cheshire, England -- [Al-Khalili, J. S. -- Cannon, A. J. -- Stevenson, P. D.] Univ Surrey, Dept Phys, Guildford GU2 7XH, Surrey, England -- [Erturk, S.] Nigde Univ, Nigde, Turkey -- [Gall, B.] ULP Strasbourg, CNRS IN2P, IPHC, F-67037 Strasbourg 2, France -- [Hadinia, B.] AlbaNova Univ Ctr, Royal Inst Technol, S-10691 Stockholm, Sweden

Subjects
Proton, Nuclear Theory, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Nuclear physics, 0103 physical sciences, nuclei with mass number 150 to 189, Neutron, alpha-decay, radioactive decay periods, Proton emission, branching ratio. Re-159, 010306 general physics, Nuclear Experiment, Physics, RADIOACTIVITY Re-159(alpha)[from Cd-106(Ni-58,p4n)], Ta-155 deduced levels, Ta-155(p)[from Re-159 a decay], 010308 nuclear & particles physics, Alpha particle, previous Ta-155 study, Charged particle, comparisons with neighbouring nuclides, measured E-alpha, E-p, T-1/2, 23.50.+z, 23.60.+e, 27.70.+q, J, pi configurations, Alpha decay, Atomic physics, Nucleon, Radioactive decay, proton emission decay
Abstract

International Conference on Proton Emitting Nuclei and Related Topics -- JUN 17-23, 2007 -- Lisbon, PORTUGAL, WOS: 000252267300021, Single-particle energies have been investigated in the closed neutron shell proton emitter Ta-155. The Ta-155 nuclei were populated through the alpha decay of Re-159, which has been observed for the first time. The (159)Rc nuclei were produced in reactions of 300 MeV Ni-58 ions with an isotopically enriched Cd-106 target, separated in-flight using the RITU separator and implanted into the GREAT spectrometer. The Re-159 a decay emanates from the proton-emitting pi h(11/2) state and populates a state in Ta-155 which decays by the emission of a proton from a pi h(11/2) orbital. The results fit in with the systematics of proton and alpha-particle separation energies in the region, but disagree with the previously reported decay properties of Ta-155., Fundacao Ciencia & Tecnol, Minist Ciencia & Tecnol, Fundacao Calouste Gulbenklan, Fundacao Luso Americana, UK Engineering and Physical Sciences Research Council; Swedish Natural Science Research Council; Academy of Finland under the Firmish Centre of Excellence Programme (project 44875 Nuclear and Condensed Matter Physics Programme at JYFL); European Union Sixth Framework contract EURONS [RII3-CT-2004-506065]; European Union Marie Curie Programme [HPMT-CT-2001-00250], The authors would like to thank the technical staff at the Accelerator Laboratory at the University of Jyvaskyla for their excellent support and to Paul Morrall from Daresbury Laboratory for making the targets. This work has been supported by the UK Engineering and Physical Sciences Research Council; the Swedish Natural Science Research Council; the Academy of Finland under the Firmish Centre of Excellence Programme (project 44875 Nuclear and Condensed Matter Physics Programme at JYFL); the European Union Sixth Framework contract EURONS (contract RII3-CT-2004-506065) and the European Union Marie Curie Programme (contract HPMT-CT-2001-00250).

Published
2007
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18. Influence of the delayed neutron group parameters on reactivity estimation by rod drop analysis

Author

C. Jammes, B. Geslot, B. Gall, Laboratoire de Dosimétrie, de Contrôle-commande et Instrumentation (LDCI), Service Physique EXpérimentale, d'essais en Sûreté et d'Instrumentation (SPESI), Département Etude des Réacteurs (DER), CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction des Energies (ex-Direction de l'Energie Nucléaire) (CEA-DES (ex-DEN)), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Département Etude des Réacteurs (DER), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), CEA-Direction de l'Energie Nucléaire (CEA-DEN), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-CEA-Direction de l'Energie Nucléaire (CEA-DEN)

Subjects
Fissile material, 020209 energy, Drop (liquid), Time constant, INVERSE KINETICS METHOD, 02 engineering and technology, Group model, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 010305 fluids & plasmas, Nuclear Energy and Engineering, 0103 physical sciences, Statistics, 0202 electrical engineering, electronic engineering, information engineering, Neutron, Statistical physics, REACTOR, Delayed neutron, Mathematics, Statistical hypothesis testing
Abstract

Recent efforts have been undertaken in the reevaluation of the delayed neutron group parameters, namely, the half-life periods and the delayed neutron fractions Indeed, 8-group parameters are now proposed instead of the standard Tuttle 6-group. Moreover, several laboratories among the nuclear engineering community are conducting researches to provide a standard set of group time constants that can suit a lot of fissile isotopes. Since, delayed neutron parameters are widely used in order to estimate reactivity by conducting dynamic experiments, it is worth investigating the influence of the group model (i.e. the number of groups and the number of fitted parameters) on reactivity estimates. This paper focuses on two issues. First, various sets of parameters obtained from JEFF-3.1 precursors data fits are compared. Using simulated rod drop transients, we discuss the uncertainty and bias on reactivity estimation. It is shown that the sets of parameters with fewer fitted parameters and with a greater number of groups give very satisfactory results. Second, the influence of the neutron spectrum is quantified. Biases up to 14% are obtained. Standard statistical tests are done in order to identify such biases on rod drop reactivity estimates.

Published
2007
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19. Gamma and electron spectroscopy of heavy nuclei at FLNR JINR

Author

A. V. Yeremin, A. V. Belozerov, M. L. Chelnokov, V. I. Chepigin, V. A. Gorshkov, A. P. Kabachenko, O. N. Malyshev, Yu. Ts. Oganessian, A. G. Popeko, A. V. Shutov, A. I. Svirikhin, A. Lopez-Martens, K. Hauschild, Ch. Briancon, A. Korichi, D. Curien, O. Dorvaux, B. Gall, F. Khalfallah, M. Rousseau, N. Rowley, M. Guttormsen, S. Siem, A.-C. Sunde, N. Syed, F. Hanappe, A. Minkova, S. Sharo, M. Venhart, Ch. Theisen, Yu. E. Penionzhkevich, E. A. Cherepanov, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (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), Département Recherches Subatomiques (DRS-IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Département d'Astrophysique, de physique des Particules, de physique Nucléaire et de l'Instrumentation Associée (DAPNIA), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), Yu. E. Penionzhkevich, E. A. Cherepanov, and Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Physics, nuclear spin, 29.30.Kv, 29.30.Dn, 27.90.+b, 21.10.Hw, nuclear energy levels, Transactinide element, 020206 networking & telecommunications, electron spectroscopy, 02 engineering and technology, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, Electron spectroscopy, Nuclear physics, gamma-ray spectroscopy, Excited state, 0202 electrical engineering, electronic engineering, information engineering, 020201 artificial intelligence & image processing, Gamma spectroscopy, alpha-decay, Alpha decay, Atomic physics, Spin (physics), Spectroscopy, Radioactive decay, nuclear parity
Abstract

International audience; Detailed spectroscopic information of excited nuclear states in deformed transfermium nuclei is scarce. Most of the information available today has been obtained from investigations of fine structure $\alpha$ decay. Although $\alpha$ decay gives access to hindrance factors and lifetimes which are strongly correlated to shell/subshell closures and the presence of isomers, only the combined use of $\gamma$ and conversion electron spectroscopy allows the precise determination of excitation energy, spin and parity of nuclear levels. In particular, the study of odd isotopes gives crucial information on the single particle states available at and around the Fermi surface. In the following, the preliminary results of decay studies using $\alpha - \gamma$ and $\alpha - \beta$ coincidences at the focal plane of the VASSILISSA recoil separator are presented.

Published
2006
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20. A survey of iodine content in Laminaria digitata

Author

E.A. Kupper F.C. And Kloareg B., Gall, Signaux oligosaccharidiques et lipidiques (SOL), Station biologique de Roscoff [Roscoff] (SBR), and Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-Université Pierre et Marie Curie - Paris 6 (UPMC)-Centre National de la Recherche Scientifique (CNRS)-GOEMAR-Centre National de la Recherche Scientifique (CNRS)

Subjects
[SDV.BBM.BM]Life Sciences [q-bio]/Biochemistry, Molecular Biology/Molecular biology
Published
2004

21. Lifetimes of the superdeformed band in $^{192}$Hg

Author

P. Willsau, A. Korichi, F. Hannachi, H. Hubel, W. Korten, M. Neffgen, F. Azaiez, C. Bourgeois, J. Duprat, N. Perrin, N. Poffé, H. Sergolle, G. Bastin, I. Deloncle, B. Gall, M. Kaci, M.G. Porquet, C. Schuck, J. Simpson, R. Duffait, Y. Le Coz, M. Meyer, N. Redon, G. De France, A.G. Smith, C.W. Beausang, M.J. Joyce, E.S. Paul, J.F. Sharpey-Schafer, R.M. Clark, R. Wadsworth, I. Ahmad, M.P. Carpenter, R.G. Henry, R.V.F. Janssens, T.L. Khoo, T. Lauritsen, J.R. Hughes, H.J. Maier, Institut de Physique Nucléaire d'Orsay (IPNO), 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 de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), 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 Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Attenuation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Decay curve, Spectral line, Coincidence, 0103 physical sciences, Quadrupole, Atomic physics, 010306 general physics, Quantum tunnelling, Line (formation)
Abstract

Lifetimes of states in the superdeformed band in 192Hg have been measured using the Doppler-shift attenuation and the recoil-distance methods for the high-spin and the low-spin regions, respectively. Line shapes and decay curves were obtained from high-fold γ-ray coincidence spectra measured with the EUROGAM array. The transition quadrupole moments, derived from the lifetimes, are constant with an average value of Qt = 18.6 b down to the bottom of the band where it decays to the normal states. This suggests that the superdeformed potential-energy minimum is still present at that point and that the decay proceeds by tunneling.

Published
1994

22. Hyperdeformed shapes and Jacobi Transitions in $^{126}$Ba

Author

Herskind, B., Hagemann, G. B., Sletten, G., Th. Dossing, Ronn Hansen, C., Odegard, S., Huebel, H., Bringel, P., Buerger, A., Neusser, A., Singh, A. K., Al-Khatib, A., Patel, S. B., Bracco, A., Leoni, S., Camera, F., Benzoni, G., Mason, P., Paleni, A., Million, B., Wieland, O., Bednarczyk, P., Azaiez, F., Byrski, T., Dominique Curien, Dakov, O., Duchene, G., Khalfallah, F., Gall, B. J. P., Piqueras, I., Robin, J., Dudek, J., Rowley, N., Redon, N., Hannachi, F., Scheurer, J. N., Wilson, J. N., Lopez-Martens, A., Korichi, A., Hauschild, K., Roccaz, J., Siem, S., Fallon, P., Y Lee, L., Goergen, A., Nyako, B. M., Algora, A., Zs. Dombradi, Gai, J., Kalinka, G., Sohler, D., Molnar, J., Timar, J., Zolnai, L., Juhasz, K., Maj, A., Kmiecik, M., Brekiesz, M., Styczen, J., Zuber, K., Lisle, J. C., Cederwall, B., Langergren, K., Evans, A. O., Rainovski, G., Angelis, G., La Rana, G., Moro, R., Gast, W., Lieder, R. M., Podsvirova, E., Jaeger, H., Petrache, C. M., Petrache, D., Institut de Recherches Subatomiques (IReS), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Cancéropôle du Grand Est-Université Louis Pasteur - Strasbourg I-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), EUROBALL, Heyd, Yvette, Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), B., Herskind, G. B., Hagemann, G., Sletten, Døssing, T. h., C., Rønn Hansen, N., Schunck, S., Ødegard, H., Hübel, P., Bringel, A., Bürger, A., Neusser, A. K. Singh A., Al Khatib, S. B., Patel, A., Bracco, S., Leoni, F., Camera, G., Benzoni, P., Mason, A., Paleni, B., Million, O., Wieland, P., Bednarczyk, F., Azaiev, Byrski, T. h., D., Curien, O., Dakov, G., Duchene, F., Khalfallah, B., Gall, L., Piqera, J., Robin, J., Dudek, N., Rowley, B. M., Nyakø, A., Algora, Z., Dombradi, J., Gal, G., Kalinka, D., Sohler, J., Molnár, J., Timár, L., Zolnai, K., Juhász, N., Redon, F., Hannachi, J. N., Scheurer, J. N., Wilson, A., Lopez Marten, A., Korichi, K., Hauschild, J., Roccaz, S., Siem, P., Fallon, I. Y., Lee, A., Görgen, A., Maj, M., Kmiecik, M., Brekiesz, J., Styczen, K., Zuber, J. C., Lisle, B., Cederwall, K., Lagergren, A. O., Evan, G., Rainovski, G., De Angeli, LA RANA, Giovanni, Moro, RENATA EMILIA MARIA, W., Gast, R. M., Lieder, E., Podsvirova, H., Jäger, C. M., Petrache, and D. P. e. t. r. a. c. h., E.

Subjects
[PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Matière Nucléaire

Published
2003

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