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3 results on '"E(ce)"'

1. Lifetime of the first excited state in 172W and 178W

Author

Rudigier, M., Régis, J.-M., Jolie, J., Zell, K.O., and Fransen, C.

Subjects
*NUCLEAR excitation, *TUNGSTEN isotopes, *ELECTRON spectroscopy, *INTERACTING boson models, *RARE earth nuclei, *NUCLEAR energy
Abstract

Abstract: The lifetime of the first excited state in 172W and 178W has been measured in fast timing experiments using the Cologne Double Orange Spectrometer for conversion electron spectroscopy. The values of the isotopes 170–178W are compared to calculations in the Interacting Boson Model (IBM) employing the consistent Q formalism. An analysis of the value systematics in the rare earth nuclei around mass using the -scheme shows signatures of a structural change in the tungsten isotopes which is not reflected in the energy systematics. [ABSTRACT FROM AUTHOR]

Published
2010
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2. Spectroscopy of 253No and its daughters

Author

A. N. Kuznetsov, A. V. Yeremin, B.J.P. Gall, A. G. Popeko, Sunniva Siem, O. N. Malyshev, D. Curien, J. Piot, O. Dorvaux, G. Drafta, S. M. Mullins, M. Guttormsen, A. P. Kabachenko, A. V. Isaev, A. Minkova, Hilde-Therese Nyhus, N. U. H. Syed, A. C. Larsen, Andreas Görgen, I. N. Izosimov, M. L. Chelnokov, K. Hauschild, N. Scintee, E. A. Sokol, T. Wiborg-Hagen, D. E. Katrasev, A. Lopez-Martens, A. I. Svirikhin, T. Kutsarova, D. Pantelica, V. I. Chepigin, S. Saro, 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), 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 Recherches sur les lois Fondamentales de l'Univers (IRFU), Commissariat à l'énergie atomique et aux énergies alternatives (CEA)-Université Paris-Saclay, Horia Hulubei National Institute of Physics and Nuclear Engineering (NIPNE), IFIN-HH, 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
Nuclear and High Energy Physics, Photon, multipolarities, NUCLEAR REACTIONS 207Pb(48Ca, Population, Electron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Coincidence, Spectral line, Nuclear physics, Eγ, Iα, 0103 physical sciences, Iγ, measured Eα, π, 010306 general physics, Spectroscopy, education, Physics, 2n), I (ce), education.field_of_study, 3n), Decay scheme, 010308 nuclear & particles physics, α(ce)-coin, deduced levels, αγ, T1/2, Qα. 253No, 249Fm, E(ce), Atomic physics, (48Ca, E = 220 MeV, Excitation, deduced ICCs
Abstract

New high-statistics data have been obtained on the decay properties of 253 No and its daughters using the reaction 207 Pb( 48 Ca, 2n) 253 No. 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 253 No and 249 Fm have been revisited. The known level scheme of 249 Fm has been confirmed, including a new level at 669 keV excitation energy. The observation of L X-rays in coincidence with the α decay of 249 Fm gives additional support to the ground-state configuration of 1 / 2 + [ 631 ] instead of 5 / 2 + [ 622 ] for 245 Cf. In both 249 Fm and 245 Cf, the interpretation of the data has been checked by comparing experimental α -particle and γ -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 253 No is confirmed by an α -tagged calorimetric measurement and the corresponding γ 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.

Published
2011

3. 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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