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96 results on '"Chepigin, V.I."'

1. Fission hindrances in transfermium nuclei

Author

Lopez-Martens A., Hauschild K., Svirikhin A.I., Asfari Z., Chelnokov M.L, Chepigin V.I., Dorvaux O., Forge M., Gall B., Isaev A.V., Izosimov I.N., Kessaci K., Kuznetsova A.A., Malyshev O.N., Mukhin R.S., Popeko A.G., Popov Yu.A., Sailaubekov B., Sokol E.A., Tezekbayeva M.S., and Yeremin A.V.

Subjects
Physics, QC1-999
Abstract

Very heavy nuclei owe their stability against spontaneous fission to quantum shell effects, which depend on the local density of single-particle states. The height but also the width and the structure of the barrier in multi-dimensional deformation space determine the fission half-lives. Other effects come into play, such as the conservation of quantum numbers and superfluidity or stiffness of the system in the fission process. This is why odd nuclei have longer fission partial half-lives with respect to their even neighbours and also why multi-quasi-particle states, such as high-K states, are thought to be more stable against fission than the ground state. We will report here on two different fission studies carried out with the GABRIELA detector array at the focal plane of the recoil separator SHELS. The first study concerns the fission properties of 253Rf, the most neutron deficient Rf isotope known to date. The second study focusses on a new measurement of the fission hindrance of the known 8- isomer in 254No.

Published
2023
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2. Structure of the prompt neutron multiplicity distribution in the spontaneous fission of 256Rf

Author

Isaev, A.V., primary, Mukhin, R.S., additional, Andreev, A.V., additional, Asfari, Z., additional, Chelnokov, M.L., additional, Chepigin, V.I., additional, Devaraja, H.M., additional, Dorvaux, O., additional, Gall, B., additional, Hauschild, K., additional, Izosimov, I.N., additional, Kuznetsova, A.A., additional, Lopez-Martens, A., additional, Malyshev, O.N., additional, Popeko, A.G., additional, Popov, Yu.A., additional, Rahmatinejad, A., additional, Sailaubekov, B., additional, Shneidman, T.M., additional, Sokol, E.A., additional, Svirikhin, A.I., additional, Tezekbayeva, M.S., additional, Yeremin, A.V., additional, and Zamyatin, N.I., additional

Published
2023
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3. Structure of the prompt neutron multiplicity distribution in the spontaneous fission of Rf

Author

Isaev, A.V., Mukhin, R.S., Andreev, A.V., Asfari, Z., Chelnokov, M.L., Chepigin, V.I., Devaraja, H.M., Dorvaux, O., Gall, B., Hauschild, K., Izosimov, I.N., Kuznetsova, A.A., Lopez-Martens, A., Malyshev, O.N., Popeko, A.G., Popov, Yu.A., Rahmatinejad, A., Sailaubekov, B., Shneidman, T.M., Sokol, E.A., Svirikhin, A.I., Tezekbayeva, M.S., Yeremin, A.V., and Zamyatin, N.I.

Abstract

An experimental study of $^{256}$Rf spontaneous fission following the fusion reaction of $^{50}$Ti+$^{208}$Pb was performed using the velocity filter SHELS of the Flerov laboratory at JINR. The average number of neutrons of ν‾=4.30±0.17 and variance of σν2=3.2 from the prompt neutron multiplicity distribution were obtained. The alpha decay branching ratio of bα=0.003−0.003+0.005 and the half-life of T1/2=(6.7±0.2) ms of the isotope were determined. For the first time, our neutron detector system allowed us to extend investigation of the prompt neutron multiplicity study to the superheavy element region.

Published
2023

6. Spectroscopy of 253No and its daughters

Author

Lopez-Martens, A., Wiborg-Hagen, T., Hauschild, K., 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., Syed, N.U.H., Sokol, E.A., Svirikhin, A.I., and Yeremin, A.V.

Published
2011
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7. 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

8. 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

9. Confirmation of the Decay of 283112 and First Indication for Hg-like Behavior of Element 112

Author

Eichler, R., Aksenov, N.V., Belozerov, A.V., Bozhikov, G.A., Chepigin, V.I., Dressler, R., Dmitriev, S.N., Gäggeler, H.W., Gorshkov, V.A., Haenssler, F., Itkis, M.G., Lebedev, V.Ya., Laube, A., Malyshev, O.N., Oganessian, Yu.Ts., Petruschkin, O.V., Piguet, D., Rasmussen, P., Shishkin, S.V., Shutov, A.V., Svirikhin, A.I., Tereshatov, E.E., Vostokin, G.K., Wegrzecki, M., and Yeremin, A.V.

Published
2007
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10. Digital Signal Processing for the GABRIELA Detector Assembly

Author

Mukhin, R.S., primary, Yeremin, A.V., additional, Izosimov, I.N., additional, Isaev, A.V., additional, Kuznetsova, A.A., additional, Malyshev, O.N., additional, Popeko, A.G., additional, Popov, Yu.A., additional, Sailaubekov, B., additional, Svirikhin, A.I., additional, Sokol, E.A., additional, Tezekbayeva, M.S., additional, Chelnokov, M.L., additional, Chepigin, V.I., additional, and Hauschild, K., additional

Published
2021
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11. Study of Spontaneous Fission Using the SFiNx System

Author

Isaev, A.V., primary, Yeremin, A.V., additional, Zamyatin, N.I., additional, Izosimov, I.N., additional, Kuznetsova, A.A., additional, Malyshev, O.N., additional, Mukhin, R.S., additional, Popeko, A.G., additional, Popov, Yu.A., additional, Sailaubekov, B., additional, Svirikhin, A.I., additional, Sokol, E.A., additional, Tezekbayeva, M.S., additional, Testov, D.A., additional, Chelnokov, M.L., additional, Chepigin, V.I., additional, Antalic, S., additional, Mosat, P., additional, Brionnet, P., additional, Gall, B., additional, Dorvaux, O., additional, Kessaci, K., additional, Sellam, A., additional, Lopez-Martens, A., additional, and Hauschild, K., additional

Published
2021
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13. Search for new isotopes of element 112 by irradiation of 238U with 48Ca

Author

Oganessian, Yu.Ts., Yeremin, A.V., Gulbekian, G.G., Bogomolov, S.L., Chepigin, V.I., Gikal, B.N., Gorshkov, V.A., Itkis, M.G., Kabachenko, A.P., Kutner, V.B., Lavrentev, A.Yu., Malyshev, O.N., Popeko, A.G., Roháč, J., Sagaidak, R.N., Hofmann, S., Münzenberg, G., Veselsky, M., Saro, S., Iwasa, N., and Morita, K.

Published
1999
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14. Measurement of proton-evaporation rates in fusion reactions leading to transfermium nuclei

Author

Lopez-Martens, A., Yeremin, A.V., Tezekbayeva, M.S., Asfari, Z., Brionnet, P., Dorvaux, O., Gall, B., Hauschild, K., Ackermann, D., Caceres, L., Chelnokov, M.L., Chepigin, V.I., Gustova, M.V., Isaev, A.V., Karpov, A.V., Kuznetsova, A.A., Piot, J., Malyshev, O.N., Popeko, A.G., Popov, Yu.A., Rezynkina, K., Savajols, H., Svirikhin, A.I., Sokol, E.A., and Steinegger, P.

Published
2019
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15. Detailed study of Rf and No isotopes radioactive decay properties

Author

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

Published
2019
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16. Synthesis of nuclei of the superheavy element 114 in reactions induced by (super48)Ca

Author

Oganessian, Yu. Ts., Yremin, A.V., Popeko, A.G., Bogomolov, S.L., Buklanov, G.V., Chelnokov, M.L., Chepigin, V.I., Gikal, B.N., Gorshkov,V.A., Gulbekian, G.G., Itkis, M.G., Kabachenko, A.P., Lavrentev,A. Yu., Malyshev, O.N., Rohac, J., Sagaidak, R.N., Hofmann, S., Saro,S., Giardina, G., and Morita, K.

Subjects
Nuclides -- Research, Environmental issues, Science and technology, Zoology and wildlife conservation
Abstract

It has been shown that neutron-rich nuclei with N > 168 can be synthesized in fusion reactions using heavy isotopes of uranium, plutonium and curium and a (super48)Ca ion beam. The synthesis of an isotope having 114 protons and 173 neutrons has been undertaken, via fusion of intense beams of (super48)Ca ions with (super242)Pu targets. The new isotope (super287)114 has a half life several times shorter than the heavier isotope (super289)114.

Published
1999

17. Chemical identification and properties of element 112

Author

Yakushev, A.B., Zvara, I., Oganessian, Yu.Ts., Belozerov, A.V., Dmitriev, S.N., Eichler, B., Hu¨bener, S., Sokol, E.A., Tu¨rler, A., Yeremin, A.V., Buklanov, G.V., Chelnokov, M.L., Chepigin, V.I., Gorshkov, V.A., Gulyaev, A.V., Lebedev, V.Ya., Malyshev, O.N., Popeko, A.G., Soverna, S., Szeglowski, Z., Timokhin, S.N., Tretyakova, S.P., Vasko, V.M., and Itkis, M.G.

Published
2004
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18. In-flight separation and mass selection of heavy evaporation residues

Author

Oganessian, Yu.Ts., Yeremin, A.V., Popeko, A.G., Malyshev, O.N., Belozerov, A.V., Buklanov, G.V., Chelnokov, M.L., Chepigin, V.I., Gorshkov, V.A., Hofmann, S., Itkis, M.G., Kabachenko, A.P., Kindler, B., Mu¨nzenberg, G., Sagaidak, R.N., Sˇa´ro, Sˇ., Scho¨tt, H.-J., Sˇtreicher, B., Shutov, A.V., Svirikhin, A.I., and Vostokin, G.K.

Published
2004
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21. 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

22. Investigation of the spontaneous fission properties of neutron-deficient nobelium isotopes

Author

Isaev, A.V., primary, Svirikhin, A.I., additional, Andreev, A.V., additional, Yeremin, A.V., additional, Izosimov, I.N., additional, Kuznetsov, A.N., additional, Kuznetsova, A.A., additional, Malyshev, O.N., additional, Popeko, A.G., additional, Popov, Yu.A., additional, Sokol, E.A., additional, Chelnokov, M.L., additional, Chepigin, V.I., additional, Schneidman, T.M., additional, Gall, B., additional, Dorvaux, O., additional, Brione, P., additional, Sellam, A., additional, Hauschild, K., additional, Lopez-Martenz, A., additional, Rezynkina, K., additional, Mullins, S., additional, and Mosat, P., additional

Published
2019
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24. 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

25. First Experimental Tests of SHELS: a New Heavy Ion Separator at the JINR

Author

Rezynkina, K., primary, Hauschild, K., additional, Lopez-Martens, A., additional, Dorvaux, O., additional, Gall, B., additional, Déchery, F., additional, Faure, H., additional, Yeremin, A.V., additional, Chelnokov, M.L., additional, Chepigin, V.I., additional, Isaev, A.V., additional, Izosimov, I.N., additional, Katrasev, D.E., additional, Kuznetsov, A.N., additional, Kuznetsova, A.A., additional, Malyshev, O.N., additional, Popeko, A.G., additional, Popov, Y.A., additional, Sokol, E.A., additional, Svirikhin, A.I., additional, Piot, J., additional, and Rubert, J., additional

Published
2015
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26. 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

27. 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

28. 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

29. GABRIELA: A new detector array for -ray and conversion electron spectroscopy of transfermium elements

Author

Hauschild, K., primary, Yeremin, A.V., additional, Dorvaux, O., additional, Lopez-Martens, A., additional, Belozerov, A.V., additional, Briançon, Ch., additional, Chelnokov, M.L., additional, Chepigin, V.I., additional, Garcia-Santamaria, S.A., additional, Gorshkov, V.A., additional, Hanappe, F., additional, Kabachenko, A.P., additional, Korichi, A., additional, Malyshev, O.N., additional, Oganessian, Yu.Ts., additional, Popeko, A.G., additional, Rowley, N., additional, Shutov, A.V., additional, Stuttgé, L., additional, and Svirikhin, A.I., additional

Published
2006
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30. GAMMA SPECTROSCOPY OF TRANSFERMIUM ELEMENTS AT THE VASSILISSA SET UP

Author

YEREMIN, A.V., primary, BELOZEROV, A.V., additional, CHELNOKOV, M.L., additional, CHEPIGIN, V.I., additional, GORSHKOV, V.A., additional, KABACHENKO, A.P., additional, MALYSHEV, O.N., additional, OGANESSIAN, YU.TS., additional, POPEKO, A.G., additional, SAGAIDAK, R.N., additional, SHUTOV, A.V., additional, SVIRIKHIN, A.I., additional, BRIANCON, CH., additional, HAUSCHILD, K., additional, KORICHI, A., additional, LOPEZ-MARTENS, A., additional, and DORVAUX, O., additional

Published
2005
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31. NEUTRON DETECTOR AT THE FOCAL PLANE OF THE SET UP VASSILISSA.

Author

SVIRIKHIN, A.I., primary, BELOZEROV, A.V., additional, CHELNOKOV, M.L., additional, CHEPIGIN, V.I., additional, GORSHKOV, V.A., additional, KABACHENKO, A.P., additional, MALYSHEV, O.N., additional, POPEKO, A.G., additional, SAGAIDAK, R.N., additional, SHUTOV, A.V., additional, SOKOL, E.A., additional, and YEREMIN, A.V., additional

Published
2005
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32. Neutron detector at the focal plane of the set up VASSILISSA

Author

Yeremin, A.V., primary, Belozerov, A.V., additional, Chelnokov, M.L., additional, Chepigin, V.I., additional, Gorshkov, V.A., additional, Kabachenko, A.P., additional, Malyshev, O.N., additional, Popeko, A.G., additional, Sagaidak, R.N., additional, Shutov, A.V., additional, Sokol, E.A., additional, and Svirikhin, A.I., additional

Published
2005
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34. Modernization of the detector system at the recoil separator Vassilissa

Author

Malyshev, O.N., primary, Chelnokov, M.L., additional, Chepigin, V.I., additional, Gorshkov, V.A., additional, Hofmann, S., additional, Kabachenko, A.P., additional, Keters, M., additional, Lavrentev, A.Yu., additional, Popeko, A.G., additional, Rohach, J., additional, Sagaidak, R.N., additional, Sharo, S., additional, and Yeremin, A.V., additional

Published
2000
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35. Statistical model and cross sections for the evaporation residues formed in the reaction at the 22Ne projectile bombarding energy of 6.0–10.0 MeV/nucleon

Author

Andreyev, A.N, primary, Bogdanov, D.D, additional, Chepigin, V.I, additional, Kabachenko, A.P, additional, Malyshev, O.N, additional, Oganessian, Yu.Ts, additional, Popeko, A.G, additional, Rohác, J, additional, Sagaidak, R.N, additional, Ter-Akopian, G.M, additional, Yeremin, A.V, additional, Šáro, Š, additional, and Veselský, M, additional

Published
1997
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36. Decay widths of highly excited Ra compound nuclei

Author

Andreyev, A.N., primary, Bogdanov, D.D., additional, Chepigin, V.I., additional, Kabachenko, A.P., additional, Malyshev, O.N., additional, Muzichka, Yu.A., additional, Oganessian, Yu.Ts., additional, Popeko, A.G., additional, Pustylnik, B.I., additional, Sagaidak, R.N., additional, Ter-Akopian, G.M., additional, and Yeremin, A.V., additional

Published
1997
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38. Large area high-efficiency time-of-flight system for detection of low energy heavy evaporation residues at the electrostatic separator VASSILISSA

Author

Andreyev, A.N., primary, Bashevoy, V.V., additional, Bogdanov, D.D., additional, Chepigin, V.I., additional, Kabachenko, A.P., additional, Malyshev, O.N., additional, Roháč, J., additional, Saro, S., additional, Taranenko, A.V., additional, Ter-Akopian, G.M., additional, and Yeremin, A.V., additional

Published
1995
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40. Long fission time of highly excited radium compound nuclei ending in the formation of evaporation residues

Author

Andreyev, A.N., primary, Bogdanov, D.D., additional, Chepigin, V.I., additional, Kabachenko, A.P., additional, Malyshev, O.N., additional, Muzichka, Yu.A., additional, Oganessian, Yu.Ts., additional, Popeko, A.G., additional, Pustylnik, B.I., additional, Roháč, J., additional, Sagaidak, R.N., additional, Taranenko, A.V., additional, Ter-Akopian, G.M., additional, and Yeremin, A.V., additional

Published
1995
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41. The kinematic separator VASSILISSA performance and experimental results

Author

Yeremin, A.V., primary, Andreyev, A.N., additional, Bogdanov, D.D., additional, Ter-Akopian, G.M., additional, Chepigin, V.I., additional, Gorshkov, V.A., additional, Kabachenko, A.P., additional, Malyshev, O.N., additional, Popeko, A.G., additional, Sagaidak, R.N., additional, Sharo, S., additional, Voronkov, E.N., additional, Taranenko, A.V., additional, and Lavrentjev, A.Yu., additional

Published
1994
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44. Production of Z≥82 heavy ion fusion evaporation residues (ER) and fissility of heavy nuclei

Author

Ter-Akopian, G.M., primary, Andreyev, A.N., additional, Bogdanov, D.D., additional, Chepigin, V.I., additional, Kabachenko, A.P., additional, Malyshev, O.N., additional, Muzychka, Yu.A., additional, Popeko, G.S., additional, Pustylnik, B.I., additional, Šáro, Š., additional, Sagaidak, R.N., additional, Veselský, M., additional, and Yeremin, A.V., additional

Published
1993
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45. Spontaneous-fission decay properties and production cross-sections for the neutron-deficient nobelium isotopes formed in the44, 48Ca +204, 206, 208Pb reactions.

Author

Belozerov, A.V., Chelnokov, M.L., Chepigin, V.I., Drobina, T.P., Gorshkov, V.A., Kabachenko, A.P., Malyshev, O.N., Merkin, I.M., Oganessian, Yu.Ts., Popeko, A.G., Sagaidak, R.N., Svirikhin, A.I., Yeremin, A.V., Berek, G., Brida, I., and Šáro, Š.

Subjects
SPONTANEOUS fission, NUCLEAR fission, DECAY schemes (Radioactivity), RADIOISOTOPE decay, NEUTRONS, NUCLEAR reactions, NUCLEAR physics
Abstract

Heavy-ion fusion reactions48Ca +204Pb and44Ca +208Pb leading to the same compound nucleus252No* were run in attempts to produce new neutron-deficient spontaneous-fission isotopes of249,250No using the electrostatic separator VASSILISSA. Production cross-sections for the spontaneous-fission activities with the half-lives 5.6 and 54 μs observed in these reactions are compared with the measured ones for the well-known isotopes of251 - 255No formed in the heavy-ion fusion reactions48Ca +206Pb and48Ca +208Pb. The obtained excitation functions for the reaction products formed after the evaporation of 1-4 neutrons from the corresponding compound No nuclei have been compared with similar data obtained earlier and results of statistical model calculations. [ABSTRACT FROM AUTHOR]

Published
2003
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46. Search for new isotopes of element 112 by irradiation of 238U with 48Ca.

Author

Oganessian, Yu.Ts., Yeremin, A.V., Gulbekian, G.G., Bogomolov, S.L., Chepigin, V.I., Gikal, B.N., Gorshkov, V.A., Itkis, M.G., Kabachenko, A.P., Kutner, V.B., Lavrentev, A.Yu., Malyshev, O.N., Popeko, A.G., Roháč, J., Sagaidak, R.N., Hofmann, S., Münzenberg, G., Veselsky, M., Saro, S., and Iwasa, N.

Abstract

The reaction 48Ca+238U was investigated at the recoil separator VASSILISSA at the Flerov Laboratory of Nuclear Reactions, JINR Dubna, in attempts to synthesize new isotopes of element 112. The experiments were performed at two beam energies resulting in excitation energies of the compound nucleus of 33 and 39 MeV. The collected beam dose was 3.5 × 1018 and 2.2 × 1018, respectively. Two spontaneous fission events were observed at the lower beam energy, which tentatively were assigned to the new neutron rich isotope 283112 produced in the reaction 238U(48Ca,3n)283112. The measured cross-section is (5.0+6.3 −3.2) pb and the half–life is (81+147 −32) s. No event was observed at the higher beam energy resulting in the upper cross–section limit of 7.3 pb. [ABSTRACT FROM AUTHOR]

Published
1999
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