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8 results on '"Popeko, A.G."'

1. Evidence of high-$K$ isomerism in $_{102}^{256}\mathrm{No}_{154}$

Author

Kessaci, K., Gall, B.J.P., Dorvaux, O., Lopez-Martens, A., Chakma, R., Hauschild, K., Chelnokov, M.L., Chepigin, V.I., Forge, M., Isaev, A.V., Izosimov, I.N., Katrasev, D.E., Kuznetsova, A.A., Malyshev, O.N., Mukhin, R., Piot, J., Popeko, A.G., Popov, Yu.A., Sokol, E.A., Svirikhin, A.I., Tezekbayev, M.S., Yeremin, A.V., 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), 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), 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), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-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
[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

International audience; Isomeric states in No256 were investigated using internal conversion electron and γ-ray spectroscopy with the GABRIELA detection system at the focal plane of the SHELS recoil separator, at the Flerov Laboratory for Nuclear Research (FLNR, JINR, Dubna). The nuclei of interest were produced using the highly asymmetric fusion-evaporation reaction U238(Ne22,4n)No256. The emission of internal conversion electrons and γ rays occurring between a No256 implantation and a subsequent α-decay event were studied, resulting in the observation of high-K isomerism in this nobelium isotope. The nature of the isomeric states is discussed in terms of possible two- and four-quasiparticle structures.

Published
2021
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2. Prototype of the Digital Electronics Chain for the GABRIELA Detector Assembly and First Tests

Author

Mukhin, R.S., Yeremin, A.V., Izosimov, I.N., Isaev, A.V., Kuznetsova, A.A., Malyshev, O.N., Popeko, A.G., Popov, Y.A., Sailaubekov, B., Svirikhin, A.I., Sokol, E.A., Tezekbayeva, M.S., Chelnokov, M.L., Chepigin, V.I., Hauschild, K., 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
Nuclear and High Energy Physics, Radiation, 010308 nuclear & particles physics, Physics::Instrumentation and Detectors, 0103 physical sciences, Radiology, Nuclear Medicine and imaging, [PHYS.PHYS.PHYS-INS-DET]Physics [physics]/Physics [physics]/Instrumentation and Detectors [physics.ins-det], 01 natural sciences, Atomic and Molecular Physics, and Optics, 010305 fluids & plasmas
Abstract

International audience; This paper describes a digital electronics chain prototype for the GABRIELA detector assembly. The goal of the digital algorithm is to reduce the dead time of the electronics to tens of nanoseconds without loss of energy and time resolution. The structure and temporal diagrams of the algorithm are given in the text. The paper also shows the energy resolution of the algorithm in comparison with the existing analog system and the results of the first in beam run.

Published
2021
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3. Influence of octupole vibration on the low-lying structure of $^{251}$Fm and other heavy $N=151$ isotones

Author

Rezynkina, K., Lopez-Martens, A., Hauschild, K., Deloncle, I., Péru, S., Brionnet, P., Chelnokov, M.L., Chepigin, V.I., Dorvaux, O., Déchery, F., Faure, H., Gall, B., Isaev, A.V., Izosimov, I.N., Katrasev, D.E., Kuznetsov, A.N., Kuznetsova, A.A., Malyshev, O.N., Popeko, A.G., Popov, Y.A., Sokol, E.A., Svirikhin, A.I., Yeremin, A.V., 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), Direction des Applications Militaires (DAM), Commissariat à l'énergie atomique et aux énergies alternatives (CEA), 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), Université de Strasbourg (UNISTRA)-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
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
Abstract

International audience; The structure of low-lying excited states in Fm251, populated by the α decay of No255, has been investigated by means of combined γ and internal conversion electron spectroscopy. The values for the internal conversion coefficients for the 1/2+→5/2+ and 5/2+→9/2− transitions have been measured. The determined M2/E3 mixing ratio and lifetime for the 5/2+ decay to the ground state allowed to determine the corresponding reduced transitions strengths of B(E3)=18(6) W.u. and B(M2)=3.0(6)×10−3 W.u. These results, as well as the results of previous studies in N=151 isotopes, are compared to theoretical calculations beyond the mean-field approach, including the first QRPA calculations using the Gogny D1M parametrization for such heavy odd-N nuclei. The comparison points to the importance of accounting for the octupole vibrations for a proper understanding of the low-lying nuclear structure of some of the heaviest elements.

Published
2018
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4. Spectroscopy of No-253 and its daughters

Author

Lopez-Martens, A., Wiborg-Hagen, T., Hauschild, K., Chelnokov, M.L, Chepigin, Vi, Curien, D., Dorvaux, O., Drafta, G., Gall, B., Gorgen, A., Guttormsen, M., Kabachenko, A.P, Katrasev, D.E, Kutsarova, T., Kuznetsov, A.N, Larsen, A.C, Malyshev, O.N, Minkova, A., Mullins, S., Nyhus, H.T, Pantelica, D., Piot, J., Popeko, A.G, Saro, S., Scintee, N., Siem, S., Syed, N.U.H, Sokol, E.A, Svirikhin, A.I, Yeremin, A.V, 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), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), and Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay

Subjects
2n), (Ca-48, multipolarities, I-gamma, pi, Q(alpha). No-253, measured E-alpha, alpha gamma, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], NUCLEAR REACTIONS Pb-207(Ca-48, deduced levels, 3n) E=220 MeV, T-1/2, E-gamma, E(ce), I(ce), (FM)-F-249, alpha(ce)-coin, I-alpha, deduced ICCs
Abstract

New high-statistics data have been obtained on the decay properties of No-253 and its daughters using the reaction Pb-207(Ca-48, 2n)No-253. This was made possible thanks to an improved transmission of fusion evaporation residues through the VASSILISSA recoil separator and an increased efficiency of the GABRIELA detector setup. The decay schemes of No-253 and Fm-249 have been revisited. The known level scheme of Fm-249 has been confirmed, including a new level at 669 keV excitation energy. The observation of L X-rays in coincidence with the a decay of Fm-249 gives additional support to the ground-state configuration of 1/2(+)[631] instead of 5/2(+)[622] for Cf-245. In both Fm-249 and Cf-245, the interpretation of the data has been checked by comparing experimental a-particle and gamma-ray spectra with realistic simulations of the decay cascades and of the interaction of particles and photons in the detectors of GABRIELA. The population of a 0.7 ms isomeric state attributed to No-253 is confirmed by an a-tagged calorimetric measurement and the corresponding gamma and electron decay spectra are presented. Possible evidence for more than one isomer is given and a tentative partial decay scheme is discussed in the light of the available experimental data, systematics and theoretical expectations. (C) 2011 Elsevier B.V. All rights reserved.

Published
2011
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5. Spectroscopy of Transfermium Nuclei Using the GABRIELA Setup

Author

Hagen, T.W., Lopez-Martens, A., Hauschild, K., Belozerov, A.V., Chelnokov, M.L., Chepigin, V.I., Curien, D., Dorvaux, O., Drafta, G., Gall, B., Görgen, A., Guttormsen, M., Isaev, A.V., Izosimov, I.N., Kabachenko, A.P., Katrasev, D.E., Kutsarova, T., Kuznetsov, A.N., Larsen, A.C., Malyshev, O.N., Minkova, A., Mullins, S., Nyhus, H.T., Pantelica, D., Piot, J., Popeko, A.G., Saro, S., Scintee, N., Siem, S., Sokol, E.A., Svirikhin, A.I., Yeremin, A.V., 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), 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), Institut de Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, 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 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
ELEMENTS, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Experiment, DECAY
Abstract

International audience; Heavy elements above Fm (Z = 100) are nuclei with vanishing liquid-drop fission barriers and are therefore entirely stabilized by quantum shell effects. Due to the large density of single-particle levels and strong polarized Coulomb fields, theoretical predictions of magic numbers are extremely model dependent. Furthermore, shell closures for one nucleon species depend strongly on the number of the other species. Reliable experimental data is needed in order to test and constrain theory. As there is a lack of such data in the region, new data is needed along with the confirmation of previous data. A detection system dedicated to the spectroscopy of transfermium nuclei was constructed in 2004 and installed at the focal plane of the VASSILISSA separator at the FLNR, Dubna, by a Franco-Russian collaboration. The results from the 2009 campaign will be presented.

Published
2010
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6. Half-life and excitation energy of the $I^{\pi}$=13/2^+ isomer in $^{209}$Ra

Author

Hauschild, K., Lopez-Martens, A., Yeremin, A.V., Dorvaux, O., Belozerov, A.V., Chelnokov, M.L., Chepigin, V.I., Gall, B., Gorshkov, V.A., Guttormsen, M., Jones, P., Kabachenko, A.P., Khouaja, A., Larsen, A.C., Malyshev, O.N., Minkova, A., Nyhus, H.T., Oganessian, Yu.Ts., Pantelica, D., Popeko, A.G., Rotaru, F., Saro, S., Shutov, A.V., Siem, S., Svirikhin, A.I., Syed, N.U.H., 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), 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
nuclear isomerism, nuclear cascades, alpha-decay, gamma-ray spectra, nuclei with mass number 190 to 219, radioactive decay periods, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], ground states, 27.80.+w, 23.35.+g, 23.20.Lv, 23.20.Nx
Abstract

An isomeric state in $^{209}$Ra has been observed for the first time, using the GABRIELA setup at the focal plane of VASSILISSA, to decay to the ground state of $^{209}$Ra via a cascade of 238-keV (M2) and 644-keV transitions. The half-life of the isomer has been measured to be 117(5) $\mu$s and from systematics is assigned as a neutron i ^{-1}_{13/2} excitation.

Published
2008
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7. Detailed spectroscopy in $^{249}$Fm

Author

Lopez-Martens, A., Hauschild, K., Yeremin, A.V., Belozerov, A.V., Briançon, C., Chepigin, V.I., Curien, D., Dorvaux, O., Gall, B., Gorshkov, V.A., Guttormsen, M., Hanappe, F., Kabachenko, A.P., Khalfallah, F., Korichi, A., Larsen, A.C., N. Malyshev, O., Minkova, A., Ts. Oganessian, Yu., Popeko, A.G., Rousseau, Marc, Rowley, N., Sagaidak, R.N., Sharo, S., Shutov, A.V., Siem, S., Svirikhin, A.I., Syed, N.U.H., Theisen, C., 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), 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), 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
PACS: 23.20.Lv, 23.20.Nx, 23.60.+e, 27.90.+b, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Excited states in 249Fm were populated via the alpha decay of 253No and the subsequent decay was observed with the GABRIELA detection system installed at the focal plane of the VASSILISSA recoil separator. The energies, spins, and parities of these states could be established through combined alpha, gamma, and conversion-electron spectroscopy. The first members of the ground-state rotational band were identified. Their excitation energies as well as the observation of a cross-over E2 transition confirm the assignment of 7/2+[624] for the ground state of 249Fm. Two excited states were also observed and their decay properties suggest that they correspond to the particle excitation 9/2-[734] and hole excitation 5/2+[622]. The analysis suggests that the 279-keV transition de-exciting the 9/2- state has anomalous E1 conversion coefficients.

Published
2006
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8. Experiments on the synthesis of superheavy elements with Z = 110,112 via $^{232}$Th, $^{238}$U+$^{48}$Ca reactions

Author

Oganessian, Y.T., Yeremin, A.V., Chepigin, V.I., Itkis, M.G., Kabachenko, A.P., Konstantinesky, O., Konstantinesky, M., Malyshev, O.N., Popeko, A.G., Rohac, J., Sagaidak, R.N., Shirokovsky, I.V., Utyonkov, V.K., Hofmann, S., Munzenberg, G., Veselsky, M., Saro, S., Iwasa, N., Morita, K., Yoneda, A., Hussonnois, M., 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), Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris-Sud - Paris 11 (UP11), and Robert, Suzanne

Subjects
[PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph], [PHYS.PHYS.PHYS-CHEM-PH] Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph]
Published
1999

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