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93 results on '"H. Sergolle"'

1. High-spin structure of the neutron-rich odd-odd 106, 108 45Rh and 110, 112 47Ag isotopes

Author

I. Deloncle, Alain Astier, Anna Wilson, H. Sergolle, J. Duprat, R. Lucas, N. Schulz, E. Gueorguieva, B. J. P. Gall, F. Hoellinger, Marco Meyer, A. Bauchet, C. Gautherin, N. Buforn, T. Kutsarova, A. Minkova, N. Redon, P. Petkov, Ts. Venkova, and Marie-Geneviève Porquet

Subjects
Physics, Nuclear and High Energy Physics, Proton, Isotope, Fission, Yrast, Nuclear Theory, Hadron, Nuclear fusion, Neutron, Atomic physics, Nuclear Experiment, Spin (physics)
Abstract

The 106, 108Rh and 110, 112Ag nuclei have been produced as fission fragments following the fusion reaction 28Si + 176Yb at 145 MeV bombarding energy and studied with the Eurogam2 array. The yrast high-spin states of these four odd-odd nuclei, which are observed for the first time, consist of rotational bands in which the odd proton occupies the πg 9/2 subshell and the odd neutron the νh 11/2 subshell. Their behaviour as a function of spin values does not vary with the number of neutrons: as observed in the odd-N neighbouring nuclei, the motion of the odd neutron remains decoupled from the motion of the core, from N = 61 to N = 65. Moreover, the staggering observed in the yrast bands of odd-odd isotopes is strongly reduced as compared to the large values displayed by the rotational bands built on the πg 9/2 subshell in the odd-A Rh and Ag isotopes. The results of particle-rotor calculations indicate that this reduction is related to a change of the core deformation.

Published
2002
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2. Multiparticle excitations in 194Pb

Author

H. Sergolle, F. Azaiez, Y. Le Coz, N. Perrin, I. Deloncle, B.J.P. Gall, J. Simpson, J. Duprat, M. Kaci, R. M. Clark, R. Duffait, Marco Meyer, N. Poffé, A. G. Smith, C. W. Beausang, M. Aiche, G. Bastin, J.F. Sharpey-Schafer, N. Redon, E. S. Paul, F. Hannachi, R. Wadsworth, K. Hauschild, C. Bourgeois, Malcolm J. Joyce, A. Korichi, C. Schück, and M.G. Porquet

Subjects
Coupling, Nuclear reaction, Physics, Nuclear and High Energy Physics, Proton, Fermi level, Dipole, symbols.namesake, symbols, Neutron, Atomic physics, Nuclear Experiment, Spin (physics), Excitation
Abstract

High-spin states of 194 Pb have been populated by the reaction 184 W( 16 O, 6n) at 113 MeV beam energy and studied using the EUROGAM-1 array. The level scheme has been extended up to spin of 33 ℏ and excitation energy of 11.1 MeV. The high-spin part of the level scheme is dominated by bands of dipole transitions. New dipole bands have been observed and the configurations of their band heads are discussed. Besides the well-known coupling of the K π =11 − two-proton state to several νi 13/2 rotation-aligned neutron states, the K π =8 + two-proton state is also involved. Such a coupling is identified for the first time in a lead isotope. Moreover, the K π =11 − two-proton state is coupled to the rotation-aligned proton pair ( πh 11/2 ) 2 . Thus many multiparticle configurations involving all the high- j subshells located around the proton and neutron Fermi levels, πh 11/2 , πh 9/2 , πi 13/2 , and νi 13/2 have been identified in this nucleus.

Published
2002
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3. High-spin structure of the neutron-rich 44 104,106,108 Ru isotopes: γ-vibrational bands and two-quasiparticle excitations

Author

M. Meyer, A. Astier, Stephane Perries, Marie-Geneviève Porquet, H. Sergolle, N. Schulz, R. Lucas, Anna Wilson, J. Duprat, A. Bauchet, J.-P. Delaroche, Sophie Péru, Michel Girod, T. Kutsarova, I. Deloncle, C. Gautherin, N. Buforn, N. Redon, E. Gueorguieva, B. J. P. Gall, Ts. Venkova, A. Minkova, and F. Hoellinger

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Fission, Nuclear Theory, Hadron, Quasiparticle, Gamma ray, Nuclear fusion, Neutron, Spin structure, Atomic physics, Nuclear Experiment
Abstract

The 104,106,108Ru nuclei have been produced as fission fragments following the fusion reaction 28Si + 176Yb at 145 MeV bombarding energy; prompt gamma rays emitted in the reaction were detected using the Eurogam II array. Their high-spin level schemes have been obtained, particularly several side bands have been extended or newly observed. Experimental results are discussed in the framework of both collective model and the rotating mean-field approach in which the Gogny force is the sole input. These calculations provide very good descriptions of both low-spin and high-spin structures observed in the neutron-rich even-A Ru isotopes.

Published
2000
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4. Intrinsic proton states around the superdeformed shell closureZ=80

Author

Y. Le Coz, M. Meyer, J.F. Sharpey-Schafer, S. Bouneau, Christian Bourgeois, János Timár, Faiçal Azaiez, M. Kaci, H. Sergolle, N. Redon, Paul-Henri Heenen, Laurent Ducroux, M. Bergström, M. A. Riley, Isabelle Deloncle, B. J. P. Gall, Ramon Wyss, E. S. Paul, Josette Duprat, M. G. Porquet, Anna Wilson, and Alain Astier

Subjects
Physics, Nuclear and High Energy Physics, Proton, Spin states, Atomic orbital, Closure (mathematics), Shell (structure), Moment of inertia, Atomic physics, Spectroscopy, Signature (topology)
Abstract

High spin states in ${}^{193}\mathrm{Tl}$ have been populated by the ${}^{181}\mathrm{Ta}{(}^{16}\mathrm{O},6n)$ reaction at 110 MeV and \ensuremath{\gamma}-ray spectroscopy was performed using the EUROGAM II array. In addition to the two known superdeformed (SD) bands, three new superdeformed bands have been identified. The dynamic moments of inertia of two of these new bands display a sudden and opposite change of slope and two of them have identical transition energies within 2 keV. The behavior of their dynamic moments of inertia and their \ensuremath{\gamma} transitions allowed us to propose configurations for the proton orbitals involved around the SD shell closure $Z=80.$ The intrinsic proton states identified are the two signature partners of the $[411]1/2$ and the negative signature of the $[651]1/2$ orbitals. Their properties are compared to the predictions of two theoretical calculations.

Published
1998
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6. g factor measurements of high spin isomeric states in 187,189,191 Au

Author

Ch. Vieu, N. Barré, Jean Vanhorenbeeck, M. Pautrat, C. Bourgeois, A. Korichi, H. Sergolle, N. Perrin, N. Benouaret, 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), and Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM)

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, g factor, Analytical chemistry, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Classical mechanics, Excited state, 0103 physical sciences, Coulomb, Nuclear fusion, Neutron, 010306 general physics, Spin (physics), Beam (structure)
Abstract

The g factors of three high spin isomers in 187,189,191Au have been measured, using the time differential perturbed angular distributions. The reactions used and the results obtained for the g factors and the lifetimes are: 172Yb(19F, 4nγ) 187Au, g (31/2- or 35/2-) = 0.25 (3), T1/2 = 102 (5) ns; 181Ta ( 12C, 4nγ) 189Au, g (31/2+) = 0.42 (2), T1/2 = 242 (10) ns; and 176Yb(19F, 4nγ) 191Au, g (31/2+) = 0.42 (3) T1/2 = 402 (20) ns. These results show that the structure of these isomers is consistent with a 1 proton, 2 neutrons structure. The experimental set-up was cheked by measuring the g factor of the Coulomb excited 197 keV, T1/2 = 89.3 ns level of the 19F beam stopped in the lead backing.

Published
1997
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7. High-spin states and band structures in182Pt

Author

H. Hübel, N. Perrin, Daniel Hojman, Ch. Bourgeois, H. Sergolle, D. G. Popescu, G. Kajrys, A. Korichi, L. L. Riedinger, J. A. Cameron, Johan Nyberg, W. Schmitz, M. P. Carpenter, J. K. Johansson, N. C. Schmeing, S. Pilotte, J. C. Waddington, S. Monaro, and V. P. Janzen

Subjects
Physics, Nuclear and High Energy Physics, Spin states, Excited state, Quasiparticle, Tandem accelerator, Atomic physics, Spin (physics), Hpge detector, Quasi particles, Bar (unit)
Abstract

Excited states in {sup 182}Pt have been studied via the heavy-ion reactions {sup 170}Yb({sup 16}O,4n), {sup 162}Dy({sup 24}Mg,4n), and {sup 163}Dy({sup 24}Mg,5n). {gamma}-ray coincidence measurements were performed with arrays of HPGe detectors at the McMaster University Tandem Accelerator Laboratory ({sup 16}O-induced reaction) and the Institut de Physique Nucl{acute e}aire, Orsay ({sup 24}Mg-induced reactions). The ground-state rotational band has been extended to I=26{h_bar}, and six new band structures have been identified and assigned quasiparticle configurations. The {gamma}-vibrational band and the band built upon the first excited 0{sup +} state have also been extended. Properties of the rotational bands are compared with cranked-shell-model and total-Routhian-surface calculations. Evidence concerning shape coexistence at low spin and band crossings at high spin is discussed. {copyright} {ital 1997} {ital The American Physical Society}

Published
1997
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8. Dipole bands in the oblate-shaped195Pb

Author

M. Kaci, H. Sergolle, Marco Meyer, C. W. Beausang, F. Azaiez, N. Redon, N. Poffé, A. G. Smith, A. Korichi, R. Wadsworth, J.F. Sharpey-Schafer, Malcolm J. Joyce, Josette Duprat, M. Aïche, B. J. P. Gall, K. Hauschild, M. G. Porquet, R. Duffait, N. Perrin, G. Bastin, F. Hannachi, R. M. Clark, E. S. Paul, I. Deloncle, C. Bourgeois, J. Simpson, Y. Le Coz, and C. Schück

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Dipole, Spectrometer, Oblate spheroid, Nuclear fusion, Neutron, Atomic physics
Abstract

The nucleus195Pb has been populated with the184W+16O reaction at 113 MeV. Two dipole γ-ray cascades have been observed using the EUROGAM spectrometer. A comprehensive level scheme related to these structures has been established. Multiparticle configurations are attributed to these high-spin structures from detailed comparison with the neighbouring nuclei,193Hg,194Pb and195Tl. Band crossings due to i13/2 neutron pair breaking are observed in195Pb at about the same frequencies as in the isotone193Hg.

Published
1996
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9. Configurations of superdeformed bands inPb193

Author

S. Bouneau, F. Hannachi, Meot, C. Schück, F. Azaiez, N. Redon, N. Poffé, Matthias Meyer, Stephane Perries, Anna Wilson, M. G. Porquet, A. Lopez-Martens, C. Bourgeois, R. Collatz, Le Coz Y, A. Astier, J.F. Sharpey-Schafer, H. Sergolle, A. Korichi, Laurent Ducroux, R. Lucas, B. J. P. Gall, Hibbert I I, R. Wadsworth, Deloncle I I, and R. Duffait

Subjects
Physics, Nuclear and High Energy Physics, Dipole, Branching fraction, Moment of inertia, Atomic physics, Quasi particles, Rotational frequency
Abstract

The six superdeformed bands in {sup 193}Pb have been studied with the EUROGAM 2 {gamma}-ray spectrometer using the {sup 168}Er({sup 30}Si,5{ital n}){sup 193}Pb reaction. The results are discussed in terms of cranked-Hartree-Fock-Bogolioubov-Lipkin-Nogami calculations. From the @FF {sup (2)} moment of inertia behavior as function of the rotational frequency and the {ital M}1 and {ital E}2 decay competition of the superdeformed states, the bands are interpreted as three pairs of signature partners based on quasineutron excitations. Dipole transitions linking two signature partner superdeformed bands have been observed and, for the first time in lead isotopes, the branching ratio {ital B}({ital M}1)/{ital B}({ital E}2)=0.15{plus_minus}0.04 {mu}{sup 2}{sub {ital N}}/{ital e}{sup 2}b{sup 2} has been extracted. {copyright} {ital 1996 The American Physical Society.}

Published
1996
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10. Rotational high spin structures in doubly-oddAu184

Author

M. E. Debray, F. Ibrahim, M. G. Porquet, H. Sergolle, I. Deloncle, A. Korichi, F. Le Blanc, J. Oms, A. J. Kreiner, Daniel Hojman, Ch. Bourgeois, N. Perrin, A. Knipper, J. Sauvage, G. Marguier, Jorge Davidson, M. Davidson, H. Somacal, and B. Roussière

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Excited state, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Spectroscopy, Spin (physics), 01 natural sciences
Abstract

Excited states in the doubly-odd{sup 184}Au nucleus have been studied by in-beam {gamma}-ray spectroscopy. This nucleus was produced through the fusion-evaporation reactions {sup 165}Ho({sup 24}Mg, 5{ital n}), {sup 170}Yb({sup 19}F, 5{ital n}), and {sup 161}Dy({sup 27}Al, 4{ital n}). Different rotational band structures have been observed and interpreted as specific couplings of proton and neutron single-particle excitations present in neighboring odd Au and Pt nuclei. {copyright} {ital 1996 The American Physical Society.}

Published
1996
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11. Thei132proton intruder orbital in the superdeformedTl193nucleus: Effective magnetic moment and blocking of proton pairing

Author

J. Duprat, H. Sergolle, F. Azaiez, N. Redon, S. Pilotte, M. G. Porquet, Laurent Ducroux, C. Bourgeois, J.F. Sharpey-Schafer, M. Bergstrom, Y. Le Coz, N. Perrin, E. S. Paul, C. Schück, Marco Meyer, Ramon Wyss, Anna Wilson, S. Bouneau, F. Hannachi, M. A. Riley, B. J. P. Gall, Alain Astier, M. Kaci, János Timár, A. Lopez-Martens, I. Deloncle, and A. Korichi

Subjects
Physics, Nuclear and High Energy Physics, symbols.namesake, Pauli exclusion principle, Magnetic moment, Proton, Yrast, Pairing, symbols, Saturation (graph theory), Moment of inertia, Atomic physics, Omega
Abstract

From the observed competition between $M1$ and $E2$ $\ensuremath{\gamma}$ transitions deexciting the states of the two signature partner yrast superdeformed bands in $^{193}\mathrm{Tl}$, the ${i}_{\frac{13}{2}}$ ($\ensuremath{\Omega}=\frac{5}{2}$) intruder proton orbital is found to have $\frac{({g}_{K}\ensuremath{-}{g}_{R})K}{{Q}_{0}}=0.138\ifmmode\pm\else\textpm\fi{}0.008$. A model dependent value of ${g}_{s}^{\mathrm{eff}}=(0.7\ifmmode\pm\else\textpm\fi{}0.2){g}_{s}^{\mathrm{free}}$ is deduced. A saturation of the ${\mathcal{T}}^{2}$ moments of inertia, at rotational frequency $\ensuremath{\hbar}\ensuremath{\omega}g0.32$ MeV, is observed for the two bands. This feature is discussed in terms of exhausted quasineutron alignment in the presence of substantially reduced quasiproton alignment due to Pauli blocking.

Published
1996
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12. M1 transitions between superdeformed states in194, 195Tl: The fingerprint of thei13/2proton intruder orbital

Author

N. Poffé, F. Azaiez, A. Kaci, N. Redon, S.J. Gale, H. Sergolle, G. Bastin, M. G. Porquet, C. Schück, A. Korichi, Josette Duprat, R. Duffait, F. Hannachi, Y. Le Coz, Malcolm J. Joyce, N. Perrin, C. Bourgeois, J.F. Sharpey-Schafer, R. Wadsworth, Marco Meyer, W. H. Kelly, C. W. Beausang, I. M. Hibbert, J. Simpson, M. Aïche, I. Deloncle, R. M. Clark, and B. J. P. Gall

Subjects
Physics, Dipole, Spins, Nuclear Theory, Quadrupole, Strong coupling, Neutron, Atomic physics, Nuclear Experiment, Condensed Matter Physics, Mathematical Physics, Atomic and Molecular Physics, and Optics
Abstract

Recent data from the EUROGAM array have revealed dipole transitions linking signature partner superdeformed bands in 194Tl and 195Tl nuclei. Measurements of the decay branching ratios, taken together with the average quadrupole moment of the neighboring superdeformed nuclei, enable the absolute M1 strengths to be determined. From these data and using the strong coupling model, we find that two SD bands in 195Tl are due to the 81st proton being in the [642]5/2+ orbital and four from the six SD bands in 194Tl correspond to a configuration where the intrinsic spins of the single proton and single neutron are aligned.

Published
1995
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13. M1 transitions between superdeformed states in 195Tl: the fingerprint of the proton intruder orbital

Author

M. Aïche, R. Duffait, I. Deloncle, A. Korichi, F. Hannachi, M. G. Porquet, R. Wadsworth, C. Bourgeois, R. M. Clark, F. Azaiez, Malcolm J. Joyce, N. Perrin, J. Simpson, C. W. Beausang, I. M. Hibbert, N. Poffé, W.H. Kelly, Josette Duprat, S.J. Gale, J.F. Sharpey-Schafer, B. J. P. Gall, M. Kaci, H. Sergolle, M. Meyer, N. Redon, Y. Le Coz, and C. Schück

Subjects
Physics, Nuclear and High Energy Physics, Dipole, Photon, Spectrometer, Yrast, Nuclear Theory, Quadrupole, Atomic physics, Nuclear Experiment, Excitation
Abstract

Dipole transitions linking the superdeformed Yrast signature-partner bands in 195Tl have been observed using the EUROGAM 1 spectrometer. From the measurements of the photon decay branching ratios, taken together with the average quadrupole moment measured in neighbouring superdeformed nuclei, we find that the two signature partner superdeformed bands involve the excitation of the 81 st proton into the i 13 2 Ω= 5 2 intruder orbital

Published
1994
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15. Spectrum ofγRays Connecting Superdeformed and Normal States inHg192

Author

F. Azaiez, N. Perrin, Y Lecoz, Marco Meyer, Ch. Bourgeois, C. Schück, P. Willsau, J. J. Simpson, A. Korichi, T. L. Khoo, Malcolm J. Joyce, A. G. Smith, T. Lauritsen, E. S. Paul, R. V. F. Janssens, B. J. P. Gall, N. Poffé, I. Deloncle, H. Sergolle, H. Hübel, R. G. Henry, M. P. Carpenter, N. Redon, J.F. Sharpey-Schafer, Thomas Døssing, Mohammed Kaci, B. Crowell, C. W. Beausang, M. G. Porquet, Iftikhar Ahmad, R. Béraud, F. Hannachi, Josette Duprat, R. M. Clark, and R. Wadsworth

Subjects
Coupling, Physics, Isotope, Spectrum (functional analysis), Nuclear structure, Gamma ray, General Physics and Astronomy, Atomic physics, Electromagnetic radiation, Spectral line, Excitation
Abstract

The complete spectrum of [gamma] rays following the decay of superdeformed (SD) states in [sup 192]Hg has been extracted. The spectrum, which comprises a quasicontinuous component and sharp lines, reveals the decay mechanism and defines the excitation energies of the SD band. The decay of SD states results from the coupling between a cold, ordered SD system with a hot, chaotic one with normal deformation.

Published
1994
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16. Two proton high-spin excitations and dipole bands in192Hg

Author

Y. Le Coz, N. Redon, A. Astier, R. Béraud, R. Duffait, M. Meyer, F. Hannachi, G. Bastin, I. Deloncle, B. Gall, M. Kaci, M. G. Porquet, C. Schück, F. Azaiez, C. Bourgeois, J. Duprat, A. Korichi, N. Perrin, N. Poffé, H. Sergolle, J. F. Sharpey-Schafer, C. W. Beausang, S. J. Gale, M. J. Joyce, E. S. Paul, R. M. Clark, K. Hauschild, R. Wadsworth, J. Simpson, M. A. Bentley, A. G. Smith, H. Hübel, P. Willsau, G. De France, I. Ahmad, M. Carpenter, R. Henry, R. V. F. Janssens, T. L. Khoo, T. Lauritsen, Institut de Physique Nucléaire de Lyon (IPNL), 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), 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), 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), 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 Flores, Sylvie

Subjects
Physics, Nuclear and High Energy Physics, Proton, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Dipole, medicine.anatomical_structure, 0103 physical sciences, medicine, Nuclear fusion, Atomic physics, Nuclear Experiment, 010306 general physics, Spin (physics), Beam energy, Nucleus, Excitation
Abstract

The192Hg nucleus was populated in the160Gd(36S, 4n) reaction at a beam energy of E=159 MeV. Emittedγ-rays were detected with the EUROGAM array comprising 43 Compton-suppressed large volume Ge detectors. The level scheme of192Hg has been extended up to an excitation energy of E=10.4 MeV and spin I=34 ħ. Two new structures, made of competing ΔI=1 and ΔI=2 transitions have been observed and their connexions with the low-lying levels established. Their lowest levels are located at 6.304 MeV and 6.879 MeV excitation energy. The experimental results are compared with mean-field HF+BCS calculations. It is proposed that the new structures originate from deformation-aligned quasi-proton excitations π(i13/2 * h9/2)K=11 andπ (h9/2) K=8 2 , coupled to rotation-aligned quasi-neutron ν(i13/2)n and quasi-proton π(h11/2)2 excitations.

Published
1994
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17. Two-proton high-K oblate structures in194Pb

Author

F. Azaiez, N. Perrin, A. Korichi, V Brindejonc, I. Deloncle, R. Wadsworth, J. Simpson, Malcolm J. Joyce, A. Astier, Marco Meyer, G. Bastin, B. J. P. Gall, F. Hannachi, Josette Duprat, C. Bourgeois, R. M. Clark, J.F. Sharpey-Schafer, M. G. Porquet, N. Redon, A. G. Smith, C. W. Beausang, N. Poffé, H. Sergolle, Y. Le Coz, and C. Schück

Subjects
Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Isotone, Moment of inertia, 01 natural sciences, Dipole, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Spin (physics), Excitation, High-κ dielectric
Abstract

Two regular dipole gamma -ray cascades have been observed in 194Pb. A comprehensive level scheme related to these structures has been built and first members of rotational bands built on K=8 and K=11 two-proton oblate states have been identified. From the excitation energies, spin values, behaviours of the moments of inertia and alignments, and from the comparison with the isotone 192Hg, multiparticle configurations can be attributed to three high-spin structures of 194Pb built respectively on the 4966 keV, 4334 keV and 6198 keV levels: ( pi 9/2(505) pi 13/2(606))(vi13/2)2, ( pi 9/2(505) pi 13/2(606))(vf5/2vi13/2), ( pi 9/2(505) pi 13/2(606)) (vf5/2(vi13/2)3). Within this interpretation, the regular dipole bands correspond to the presence of two or three i13/2 decoupled neutrons.

Published
1994
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18. Relative population of oblate and prolate structures in189Au

Author

F. Ibrahim, F. Le Blanc, N. Perrin, Daniel Hojman, A. Korichi, H. Sergolle, C. Bourgeois, D. G. Popescu, Josette Duprat, F. Azaiez, Institut de Physique Nucléaire d'Orsay (IPNO), 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 and High Energy Physics, education.field_of_study, Spin states, 010308 nuclear & particles physics, Population, Prolate spheroid, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 0103 physical sciences, Oblate spheroid, Nuclear fusion, Atomic physics, 010306 general physics, education, Beam energy, Beam (structure)
Abstract

High spin states of189Au were populated via the174Yb (19F, 4n reaction at 86, 90, 95 and 100 MeV beam energies. The study of the relative population of oblate and prolate structures shows a striking disappearance of the prolate band relative to the oblate ones as the beam energy goes from 86 to 100 MeV.

Published
1993
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19. Study of the superdeformed band in 194Pb and 192Hg with EUROGAM

Author

J. Simpson, N. Perrin, M. G. Porquet, Malcolm J. Joyce, F. Azaiez, G. Bastin, B. J. P. Gall, A. Astier, S.J. Gale, M. Meyer, C. Schück, N. Poffé, J.F. Sharpey-Schafer, F. Hannachi, P.M. Jones, Y. Le Coz, R. G. Henry, P. J. Dagnall, S. A. Forbes, N. Redon, M. P. Carpenter, P. Willsau, I. Deloncle, R. M. Clark, T. Lauritsen, M. A. Bentley, M. M. Aleonard, A. Korichi, C. Bourgeois, E. S. Paul, C. W. Beausang, G deFrance, H. Sergolle, D. Curien, AG Smith, R. Wadsworth, Josette Duprat, and Padraic G. Fallon

Subjects
Physics, Nuclear and High Energy Physics, Deformation (meteorology), Atomic physics
Abstract

A subset of the Eurogam array has been used to investigate the decay out of the superdeformed (SD) band in 194Pb. Two new band members and a new decay pattern into the low lying states at normal deformation (ND) have been established for this band. In the level scheme at normal deformation, the linking transitions between the previously known floating ΔI = 1 sequence and the lower states have been established for the first time. In this talk we will also report on the preliminary results of the search for the linking transitions between the SD and ND states in 192Hg with the fully operational EUROGAM array.

Published
1993
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20. Relative population of the oblate and prolate structures in187Au

Author

D. Hojman, N. Perrin, A. Korichi, F. Hannachi, M. G. Porquet, C. Bourgeois, D. G. Popescu, H. Sergolle, 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), and Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM)

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, 010308 nuclear & particles physics, Population, Prolate spheroid, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 0103 physical sciences, Oblate spheroid, Nuclear fusion, Atomic physics, 010306 general physics, education, Beam energy
Abstract

The population of the oblate and the prolate structures in187Au has been studied using the “Château de Cristal” set-up through the172Yb(19F, 4n) reaction at 90, 95 and 100 MeV beam energy. γ — γ, γ-Fold and γ -Sum energy coincidence measurements were performed, γ-ray intensity measurements showed that as the beam energy increases the prolate system is less populated than the oblate one. Fold and Sum-energy associated with oblate and prolate structures showed a different behaviour with increasing beam energy. Two mechanisms are suggested to explain these results.

Published
1992
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21. High-spin study of186Hg

Author

C. Bourgeois, A. Korichi, G. Bastin, M. G. Porquet, H. Sergolle, F. Beck, and N. Perrin

Subjects
Physics, Nuclear and High Energy Physics, Nuclear magnetic resonance, 010308 nuclear & particles physics, Gamma ray spectrometer, 0103 physical sciences, Atomic physics, 010306 general physics, Spin (physics), 01 natural sciences, 3. Good health
Abstract

A detailed spectroscopic study of 186Hg has been performed using the 'Chateau de Cristal' 4 pi gamma spectrometer. High-spin levels of 186Hg are established up to spin 27h(cross). Several negative-parity bands are proposed. Properties of bands of 186Hg are compared to those of neighbouring nuclei.

Published
1992
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23. High-spin structure ofTl189: Role ofh9/2protons in the prolate minimum of light Hg isotopes

Author

Jorge Davidson, M. E. Debray, M. G. Porquet, Ch. Bourgeois, A. Korichi, G. Falcone, F.A. Beck, H. Sergolle, Vito R. Vanin, N. Perrin, H. Mosca, J.C. Merdinger, F. Hannachi, A. J. Kreiner, and G. Bastin

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Proton, Hadron, Nuclear structure, Spin structure, Atomic physics, Nucleon, Spectroscopy, Spectral line
Abstract

High-spin states in $^{189}\mathrm{Tl}$ have been populated through the $^{165}\mathrm{Ho}$${(}^{28}$Si,4n) reaction and studied with in-beam \ensuremath{\gamma}-ray spectroscopy techniques. Both oblate and prolate structures associated with the i13/2 proton orbit are confirmed and extended to higher spins (19/2 and 41/2, respectively). However, only the oblate structure related to the \ensuremath{\pi}h9/2 has been observed meaning that the associated prolate structure is nonyrast contrary to expectation. This experimental result points clearly to a large amplitude of (\ensuremath{\pi}h9/2${)}^{2}$ in the wave function of the prolate minimum of $^{188}\mathrm{Hg}$.

Published
1991
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24. High-spin structures observed in the 101Tc fission fragment

Author

N. Schulz, B. J. P. Gall, T. Kutsarova, A. Minkova, S. Courtin, F. Hoellinger, I. Deloncle, Josette Duprat, M. G. Porquet, H. Sergolle, Andrew A. Wilson, R. Lucas, and C. Gautherin

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Fission, Excited state, Nuclear Theory, Gamma ray, Nuclear fusion, Atomic physics, Nuclear Experiment, Spin (physics), Spectral line, Excitation
Abstract

High-spin states have been studied in 101Tc produced as a fission fragment in the reaction 176Yb +28Si at 145 MeV. Gamma rays were detected with the EUROGAM2 array. The level scheme of 101Tc has been extended up to 4.2 MeV excitation energy and several band structures are observed. Configurations are assigned to two new bands on the basis of their behaviour and of cranked Hartree-Fock-Bogolyubov calculations.

Published
1999
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25. Spin and parity values of states of dipole bands in 194Pb

Author

N. Perrin, J.S. Dionisio, F. Farget, A. Korichi, Josette Duprat, Y. Le Coz, M. G. Porquet, L. Han, I. Deloncle, Michèle Pautrat, Alain Astier, C. Schück, F. Azaiez, C. Bourgeois, D. Santos, Ch. Vieu, B. J. P. Gall, M. Kaci, H. Sergolle, 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 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 Physique Nucléaire d'Orsay (IPNO), Laboratoire de Physique Subatomique et de Cosmologie (LPSC), 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), 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), 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), and 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)-Université Grenoble Alpes (UGA)

Subjects
Physics, Nuclear and High Energy Physics, Dipole, 010308 nuclear & particles physics, 0103 physical sciences, Hadron, Nuclear fusion, Parity (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic physics, 010306 general physics, 01 natural sciences
Abstract

Spin and parity values of the states of two dipole bands in 194Pb have been determined from internal conversion and linear polarisation measurements. The multiparticle configurations assigned previously to these dipole bands are discussed within these results.

Published
1998
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26. First indication of population of superdeformed states by incomplete fusion reactions

Author

Alain Astier, I. Deloncle, Josette Duprat, M. Kaci, H. Sergolle, B. J. P. Gall, D. Prévost, S. Bouneau, N. Redon, M. M. Aleonard, U. J. van Severen, J.F. Sharpey-Schafer, E. Gueorguieva, Marco Meyer, C. W. Beausang, N. Dozié, F. Azaiez, W. Korten, Laurent Ducroux, D. Curien, C. Bourgeois, G. Baldsiefen, M. G. Porquet, and F.A. Beck

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, Nuclear Theory, Recoil velocity, Population, Nuclear fusion, Atomic physics, Nuclear Experiment, education, Energy (signal processing)
Abstract

The high-spin normally deformed and superdeformed states of ${}^{194}\mathrm{Hg}$ have been populated in an exit channel of the ${}^{16}{\mathrm{O}+}^{186}\mathrm{W}$ reaction at 110 MeV bombarding energy. The Doppler shift analysis of the energies of the \ensuremath{\gamma} transitions de-exciting both normally deformed and superdeformed states in ${}^{194}\mathrm{Hg}$ indicates a lower recoil velocity of the ${}^{194}\mathrm{Hg}$ nucleus compared to that of the ${}^{196}\mathrm{Pb}$ nucleus obtained from the $6n$ exit channel of the complete-fusion compound nucleus. This suggests that incomplete fusion plays the main role in the population of normally deformed and superdeformed states of ${}^{194}\mathrm{Hg}$ in this reaction.

Published
1997
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27. Evidence for deformation in $^{113-116}$Cd isotopes

Author

Stephane Perries, F. Hoellinger, N. Redon, H. Sergolle, E. Gueorguieva, B. J. P. Gall, I. Deloncle, T. Kutsarova, Jean-Arcady Meyer, N. Buforn, R. Lucas, A. Minkova, O. Stezowski, N. Schulz, Ts. Venkova, Alain Astier, A. Bauchet, Marco Meyer, Anna Wilson, Josette Duprat, C. Gautherin, M. G. Porquet, 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), 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 de Physique Nucléaire d'Orsay (IPNO), 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 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), 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 and High Energy Physics, Isotope, [PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th], 010308 nuclear & particles physics, Nuclear Theory, Hadron, Prolate spheroid, Deformation (meteorology), 01 natural sciences, 7. Clean energy, Isotopes of cadmium, 0103 physical sciences, Nuclear fusion, Atomic physics, Nuclear Experiment, 010306 general physics, Spin (physics), Nuclear Physics
Abstract

High-spin states in 113-116Cd have been investigated with the fusion-fission reaction 28Si +176Yb at 145 > MeV. The experiment has been performed with the Eurogam2 array. New rotational bands based on two quasi-particle states have been observed for even-even cadmium isotopes. A new level scheme based on the 11/2− isomeric state is proposed for 115Cd and the one of 113Cd has been extended to spin (31/2−). The decoupled bands identified in both odd-A nuclei are interpreted as being built upon a low-Ωh11/2 quasi-neutron configuration. Microscopic Hartree-Fock + BCS calculations confirm the prolate deformation in this mass region especially for the odd cadmium isotopes.

Published
2000
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28. High-Spin States in the Transitional Palladium Nuclei Observed in Heavy-Ion Induced Fission

Author

E. Gueorguieva, N. Schulz, T. Kutsarova, P. Petkow, H. Sergolle, M. G. Porquet, Josette Duprat, Anna Wilson, S. Bouneau, R. Lucas, A. Minkova, F. Hoellinger, I. Deloncle, C. Bourgeois, B. J. P. Gall, Ts. Venkova, C. Gautherin, F. Azaiez, 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), and Smit F.D. Lindsay R. Foertsch S.V.

Subjects
Physics, Spin states, 010308 nuclear & particles physics, Fission, Nuclear Theory, Radiochemistry, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Molecular physics, Spectral line, 0103 physical sciences, Potential energy surface, Quasiparticle, Nuclear fusion, Nuclear Experiment, 010306 general physics, Spontaneous fission
Abstract

The low-spin collective excitations of even-even Pd nuclei in the A ≈ 110 mass region indicate a structural transition from an anharmonic vibrator to a gamma-soft rotor. This observation is supported by recent calculations of the potential energy surfaces using different types of mean field approaches. In particular, prolate-to-oblate shape transition has been predicted at 111Pd [1]. Experimental evidence for a shape change or shape coexistence can be obtained by high-spin studies of these transitional nuclei. Band crossings in the odd-N Pd nuclei are especially important to understand the origin of the alignments. No band structures built on the low-lying states were known in heavier odd Pd nuclei (A≥109). High-spin states in these nuclei cannot be populated using fusion-evaporation reactions. The heavier neutron-rich 112,114,116Pd nuclei have been studied from spontaneous fission of 252Cf [2]. In this work the less neutron-rich Pd nuclei have been produced as fission fragments following the fusion reactions 28Si + 176Yb at 145 MeV. The 28Si beam was provided by the Vivitron accelerator in Strasbourg. Gamma rays were recorded with the EUROGAM2 array [3]. The level schemes were constructed by examining γ- spectra extracted from two and three dimensional matrices.

Published
2000
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29. High-spin structure of the neutron-rich $^{107,109}_{45}$Rh isotopes : the role of triaxiality

Author

I. Deloncle, H. De Witte, A. Minkova, N. Schulz, Ts. Venkova, F. Hoellinger, A. Bauchet, P. Petkov, E. A. Stefanova, Marie-Geneviève Porquet, Anna Wilson, C. Gautherin, E. Gueorgieva, T. Kutsarova, J. Duprat, H. Sergolle, R. Lucas, B. J. P. Gall, 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), 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), and Institut de Physique Nucléaire d'Orsay (IPNO)

Subjects
Nuclear reaction, Physics, Nuclear and High Energy Physics, Proton, 010308 nuclear & particles physics, Fission, Nuclear Theory, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Excited state, 0103 physical sciences, Quasiparticle, Nuclear fusion, Neutron, Atomic physics, Nuclear Experiment, 010306 general physics
Abstract

The 107,109Rh nuclei have been produced as fission fragments following the fusion reaction 28Si +176Yb at 145 MeV bombarding energy and studied with the Eurogam2 array. In both nuclei three new rotational bands with the odd proton occupying the πg9/2, πp1/2 and π(g7/2/d5/2) sub-shells have been observed. In 107Rh, two other bands involving strong M1 transitions have been identified at excitation energy larger than 2 MeV. They can be interpreted in terms of three quasiparticle excitations. In addition new structures consisting of four transitions, built on states located at low excitation energy (680 keV in 107Rh and 642 keV in 109Rh), point out the importance of triaxial deformation in these two isotopes.

Published
1999

30. Decay from superdeformed yrast states to normal deformed states in $^{193}$Tl

Author

Anna Wilson, János Timár, N. Redon, Y. Le Coz, M. G. Porquet, M. A. Riley, J.F. Sharpey-Schafer, I. Deloncle, Laurent Ducroux, M. Bergström, M. Kaci, H. Sergolle, Alain Astier, Marco Meyer, B. J. P. Gall, Ramon Wyss, S. Bouneau, F. Azaiez, E. S. Paul, Josette Duprat, C. Bourgeois, 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
Physics, Nuclear and High Energy Physics, High energy, spatial metaphor, 010308 nuclear & particles physics, Yrast, Nuclear Theory, Hadron, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], mental representations, 01 natural sciences, medicine.anatomical_structure, 0103 physical sciences, medicine, Nuclear fusion, Atomic physics, Nuclear Experiment, 010306 general physics, Spin (physics), Nucleus, Excitation, e-learning
Abstract

Information and Communication Technologies change the way people consider information and knowledge. Their use in e-learning raises orientation problems while navigating within technological devices. First of all, the learner-subject must locate the tools and services at his disposal during all of the training. To help orientation, resorting to the spatial metaphor is frequent. This research is based on results of some empirical survey. It is the opportunity of questioning oneself as to the limits of this type of metaphor by studying mental representations that users may have. Solutions could be brought by making spatial metaphor intervene more as a tool of information processing than as a tool of software localization.

Published
1998

31. Odd-even effects in fission induced by heavy ions

Author

T. Kutsarova, E. Gueorguieva, A. Minkova, N. Redon, S. Perries, R. Lucas, Ts. Venkova, Matthias Meyer, C. Gautherin, Josette Duprat, F. Azaiez, A. Astier, Anna Wilson, S. Bouneau, B. J. P. Gall, I. Deloncle, M. G. Porquet, C. Bourgeois, F. Hoellinger, H. Sergolle, N. Schulz, Flores, Sylvie, 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), 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), 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 Lorgeril, Jocelyne

Subjects
Nuclear reaction, Fission products, Spins, Isotope, 010308 nuclear & particles physics, Chemistry, Fission, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Nuclear Theory, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Ion, Nuclear physics, 0103 physical sciences, Nuclear Experiment, 010306 general physics, Spin (physics)
Abstract

About eighty nuclei in the A≈100 mass region have been observed as fission fragments following the fusion evaporation 28,30Si+176Yb at 145 MeV bombarding energy. These nuclei have been identified from their γ-ray cascades detected with the EUROGAM2 array. The level schemes of several stable or neutron-rich nuclei have been extended to higher spins. From coincidences between transitions in complementary fragments, γ-rays de-exciting new high-spin states of hitherto unexplored isotopes can be assigned and some aspects of the fission mechanism can be studied.

Published
1998

32. Octupole Vibrations of the Superdeformed $^{196}$Pb Nucleus

Author

W. Korten, M. M. Aléonard, Josette Duprat, H. Sergolle, N. Dozié, S. Baldsiefen, C. W. Beausang, H. Hübel, D. Curien, Ch. Bourgeois, J.F. Sharpey-Schafer, U. J. van Severen, Mohammed Kaci, A. Astier, Laurent Ducroux, B. J. P. Gall, S. Bouneau, F. Azaiez, N. Redon, Takashi Nakatsukasa, I. Deloncle, Matthias Meyer, M. G. Porquet, F.A. Beck, 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), 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
Physics, Nuclear and High Energy Physics, Spectrometer, Yrast, Nuclear Theory, Hadron, Phase (waves), General Physics and Astronomy, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], medicine.anatomical_structure, Excited state, medicine, Atomic physics, Nuclear Experiment, Spin (physics), Nucleus, Excitation
Abstract

The study of the superdeformed (SD)196Pb nucleus has been revisited using the Eurogam Phase 2 spectrometer. All of the three observed excited SD bands were found to decay to the yrast SD band through, presumably,E1 transitions, allowing relative spin and excitation energy assignments. Comparisons with calculations using the random-phase approximation suggest that all three excited bands can be interpreted as octupole vibrational structures.

Published
1997

33. New results on the superdeformed $^{196}$Pb nucleus: decay of the excited bands to the yrast band

Author

J.F. Sharpey-Schafer, D. Curien, M. M. Aleonard, C. Bourgeois, G. Baldsiefen, Laurent Ducroux, Takashi Nakatsukasa, Alain Astier, N. Dozié, N. Redon, W. Korten, S. Bouneau, M. Kaci, H. Sergolle, H. Hübel, B. J. P. Gall, Josette Duprat, Marco Meyer, C. W. Beausang, U. J. van Severen, F. Azaiez, I. Deloncle, M. G. Porquet, F.A. Beck, 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), Centre d'Etudes Nucléaires de Bordeaux Gradignan (CENBG), Université Sciences et Technologies - Bordeaux 1-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-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), 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
Physics, Nuclear and High Energy Physics, Isotope, 010308 nuclear & particles physics, Yrast, Gamma ray, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, Excited state, 0103 physical sciences, medicine, Nuclear fusion, Atomic physics, 010306 general physics, Nucleus, Radioactive decay
Abstract

The study of the superdeformed 196Pb nucleus has been revisited using the EUROGAMphase 2 array. In addition to the known yrast and two excited SD bands, a third excited SD band has been found. All of the three excited bands were found to decay to the yrast SD band through presumably E1 transitions. Comparisons with calculations using RPAapproximation indicate that the excited bands can be interpreted as octupole-vibrational structures.

Published
1996

34. Dipole bands and multi-quasiparticle excitations in $^{193}$Pb

Author

V. Méot, N. Poffé, M. G. Porquet, I. Deloncle, Stephane Perries, C. Bourgeois, Anna Wilson, R. Duffait, Y. Le Coz, Marco Meyer, R. Wadsworth, A. Astier, A. Lopez-Martens, C. Schück, I. M. Hibbert, F. Azaiez, F. Hannachi, R. Collatz, J.F. Sharpey-Schafer, A. Korichi, Laurent Ducroux, B. J. P. Gall, S. Bouneau, N. Redon, H. Sergolle, R. Lucas, Institut de Physique Nucléaire de Lyon (IPNL), 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), 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), Institut de Physique Nucléaire d'Orsay (IPNO), 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), 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), 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 Lorgeril, Jocelyne

Subjects
Physics, Nuclear and High Energy Physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Shell (structure), Fermi surface, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Dipole, Atomic orbital, 0103 physical sciences, Quasiparticle, Nuclear fusion, Atomic physics, Spin (physics), 010306 general physics, Excitation
Abstract

The nucleus 193Pb was populated via the 168Er(30Si,5n) reaction at a beam energy of 159 MeV and studied with the EUROGAM II spectrometer. Five new dipole Δ I = 1 cascades have been found. These structures have been connected to the level scheme which has been considerably extended up to a spin of ħ and an excitation energy of about 8 MeV. Angular distribution coefficients, a2, have been measured and confirm the dipole character of the in-band transitions. B(M1)/B(E2) ratios have been extracted for the two most intense cascades. The 193Pb dipole bands are discussed in comparison with those known in odd lead isotopic series and the structure of the band heads is analyzed in terms of microscopic HF+BCS calculations. The proposed configurations are based on a high-K two quasiproton excitation, π ([505]9/2t? ⊗ [606]13/2+)K=11t-, coupled to one or three rotation aligned quasineutrons involving the i13/2, p3/2, f5/2 and/or h{9/2} subshells. The main difference, compared with the heavier lead isotopes, is the presence of large Ω orbitals from the ν (i13/2) shell near the Fermi surface which are responsible for the increasing band-head spin as A decreases.

Published
1996

35. Observation and lifetime of the first excited superdeformed band in $^{192}$Hg

Author

A. Korichi, M. Kaci, H. Sergolle, T. L. Khoo, R. M. Clark, Josette Duprat, E. S. Paul, H. Hübel, J. Simpson, M. Meyer, A. G. Smith, I. Ahmad, Y. Le Coz, R. Wadsworth, N. Redon, W. Korten, C. W. Beausang, G. Bastin, N. Poffé, Malcolm J. Joyce, M. G. Porquet, R. Duffait, F. Hannachi, F. Azaiez, J.F. Sharpey-Schafer, B. J. P. Gall, C. Schück, T. Lauritsen, C. Bourgeois, R. V. F. Janssens, I. Deloncle, R. G. Henry, M. P. Carpenter, N. Perrin, P. Willsau, 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 de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), Institut de Physique Nucléaire de Lyon (IPNL), 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), 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), 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)-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)

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, Attenuation, Electronic structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, medicine.anatomical_structure, Excited state, 0103 physical sciences, Quadrupole, medicine, Atomic physics, 010306 general physics, Nucleus, Excitation
Abstract

An excited superdeformed (SD) band has been observed in 192Hg with the UROGAM spectrometer. It is interpreted as a two quasi-neutron excitation in the 192Hg SD nucleus. Nuclear level lifetimeshave been measured using the Dopple-shift attenuation method. An average transition quadrupole moment of 19.5 ± 1.5 b has been obtained which is similar to the value measured in the yeast SD band. These results indicate that the deformation in the 192Hg SD nucleus is stable despite changes in the occupancy of high-N-orbitals.

Published
1995

36. Confirmation of the existence of a superdeformed rotational band in $^{192}$Pb

Author

R. Collatz, J.F. Sharpey-Schafer, M. Kaci, H. Sergolle, R. Lucas, J.P. Vivien, Alain Astier, D. Goutte, I. Deloncle, M. G. Porquet, R. Béraud, F.A. Beck, C. Bourgeois, G. Duchêne, R. Duffait, A. Lopez-Martens, A. Korichi, Anna Wilson, R. Wadsworth, Y. Le Coz, B. Haas, Marco Meyer, S. Perries, I. M. Hibbert, D. Curien, F. Azaiez, Josette Duprat, C. Schück, N. Poffé, F. Hannachi, S. Bouneau, V. Méot, L. Ducroux, B. J. P. Gall, N. Perrin, N. Redon, 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), 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 de Physique Nucléaire d'Orsay (IPNO), 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 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), 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 and High Energy Physics, Spectrometer, 010308 nuclear & particles physics, 0103 physical sciences, Nuclear fusion, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract

A controversy has arisen over the existence, or not, of a superdeformed rotational band in192Pb. We have carried out an experiment using the168Er(3OSi, 6n)192Pb reaction at 159 MeV and have observed the coincidentγ rays in the EUROGAM 2 spectrometer. We confirm the original result of Henry et al. that a superdeformed band exists in192Pb.

Published
1995

37. 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

38. High spin states of $^{189}$Au

Author

A. Korichi, F. Azaiez, N. Perrin, H. Sergolle, G. Bastun, C. Bourgeois, D. G. Popescu, D. Hojman, Lorgeril, Jocelyne, Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM), 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, Spin states, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, Nuclear magnetic resonance, 0103 physical sciences, Nuclear fusion, Atomic physics, Nuclear Experiment, 010306 general physics, Spectroscopy
Abstract

High-spin states of189Au have been investigated through the174Yb(19F, 4n) reaction using in-beam gamma-ray spectroscopy techniques with the “Château de Cristal“ multidetector array. An extended level scheme is proposed.

Published
1992

39. Rotational bands in ^{201}pb

Author

H. Sergolle, D. Hojman, F. Azaiez, H. Hübel, C. Bourgeois, G. Baldsiefen, N. Perrin, A. Korichi, 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), and Blanchet, Marie-Christine

Subjects
Physics, Nuclear and High Energy Physics, Spectrometer, Proton, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Deformation (meteorology), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 0103 physical sciences, Oblate spheroid, Nuclear fusion, Atomic physics, Nuclear Experiment, 010306 general physics, Beam energy
Abstract

High-spin states in201P6 were populated in the192Os(14C, 5n)201Pb reaction at a beam energy of 70 MeV. Gamma-ray coincidences were measured with the Chateau de Cristal spectrometer array. Two rotational bands with rather regular energy spacings have been found. The data are interpreted in terms of collective bands built on proton particle-hole excitations coupled to i13/2neutrons at oblate deformation.

Published
1992

40. Population of the oblate and prolate systems in $^{187}$Au produced at various beam energies in two different reactions

Author

A. Korichi, N. Perrin, D. Hojman, F. Hannachi, C. Bourgeois, M. G. Porquet, D. G. Popescu, H. Sergolle, 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), and Centre de Spectrométrie Nucléaire et de Spectrométrie de Masse (CSNSM)

Subjects
Physics, education.field_of_study, 010102 general mathematics, Population, Prolate spheroid, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 7. Clean energy, Ion, 0103 physical sciences, Oblate spheroid, 0101 mathematics, Atomic physics, 010306 general physics, education, Beam energy, Beam (structure)
Abstract

the population of the oblate and the prolate systems in 187Au has been studied through fusion-evaporation reactions induced by two different heavy ions at various beam energies. Data from both reactions established that the prolate system is less populated than the oblate one with increasing energy.

Published
1991

41. High spin investigation in 193Pb with EUROGAM 2: coexistence of superdeformed and dipole bands

Author

C. Schück, B. J. P. Gall, R. Collatz, S. Perries, J.F. Sharpey-Schafer, Y. Le Coz, C. Bourgeois, M. G. Porquet, A. Korichi, S. Bouneau, Laurent Ducroux, A. Lopez-Martens, R. Duffait, R. Wadsworth, F. Hannachi, H. Sergolle, I. Deloncle, N. Poffé, R. Lucas, N. Redon, Marco Meyer, I. M. Hibbert, F. Azaiez, Anna Wilson, Alain Astier, and V. Méot

Subjects
Physics, Nuclear and High Energy Physics, Dipole, Spectrometer, Isotope, Ratio value, Nuclear fusion, Atomic physics, Rotation, Spin (physics), Excitation
Abstract

The nucleus 193Pb was populated via the 168Er(30Si, 5n) reaction at a beam energy of 159 MeV and studied with the EUROGAM II spectrometer. Five new dipole ΔI = 1 cascades have been found. The 193Pb dipole bands are discussed in terms of microscopic HF+BCS calculations. The proposed configurations are based on a high-K two-quasiproton excitation coupled to rotation aligned quasineutrons. Parallel to the dipole bands the six superdeformed bands have been discussed in the framework of microscopic mean-field calculations. The bands are interpreted as three pairs of signature partners based on quasineutron excitations. Cross-talk transitions linking two signature partner superdeformed bands have been observed and, for the first time in lead isotopes, a mean B(M1)/B(E2) ratio value of 0.15±0.04 μ N 2 /e2b2 has been extracted.

Published
1997
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42. Highest spin reached in the superdeformed well in the A≈190 mass region

Author

C. Bourgeois, M. G. Porquet, S. Bouneau, M. Kaci, H. Sergolle, Josette Duprat, I. Deloncle, and F. Azaiez

Subjects
Physics, Nuclear and High Energy Physics, Angular momentum, Fissility, Fission, Yrast, Nuclear Theory, Nuclear physics, Nuclear fusion, Heavy ion, Gammasphere, Atomic physics, Nuclear Experiment, Spin (physics)
Abstract

The high efficiency of the new-generation of γ-arrays as EUROGAM or GAMMASPHERE makes reachable the fission limit in angular momentum of the nuclei populated by means of heavy ion reactions in the A ≈ 190 mass region. This is established by the strong correlation between the fissility parameters Z2/A and the spin values of the state of highest energy observed in the yrast superdeformed bands.

Published
1997
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43. Possible candidates for discrete gamma rays linking superdeformed and yrast states in an odd nucleus:193Pb

Author

Anna Wilson, R. Collatz, J.F. Sharpey-Schafer, C. Bourgeois, S. Bouneau, C. Schück, Y. Le Coz, F. Hannachi, Alain Astier, B. J. P. Gall, V. Méot, I. Deloncle, Marco Meyer, I. M. Hibbert, F. Azaiez, A. Lopez-Martens, M. G. Porquet, N. Redon, R. Wadsworth, R. Duffait, N. Poffé, A. Korichi, Laurent Ducroux, S. Perries, H. Sergolle, and R. Lucas

Subjects
Physics, Nuclear and High Energy Physics, Isotope, Yrast, Gamma ray, Nuclear physics, medicine.anatomical_structure, medicine, Nuclear fusion, Atomic physics, Spin (physics), Beam energy, Nucleus, Excitation
Abstract

We have carried out an experiment using the reaction168Er (30Si, 5n)193Pb at a beam energy of 159MeV with EUROGAM 2 to study the superdeformed (SD) bands in193Pb. We have observed some discreteγ rays which are possible candidates for links between the yrast SD band and the low-lying levels in this odd lead isotope. These data suggest for the lowest state of the SD band 1 an excitation energy of 4217±2 keV and a spin of (23/2−).

Published
1996
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44. Two proton high spin excitations and dipole bands in 192Hg

Author

I. Deloncle, Alain Astier, J.F. Sharpey-Schafer, G. B. L. Smith, J. Simpson, T. Lauritsen, Y. Le Coz, K. Hauschild, H. Hübel, Malcolm J. Joyce, E. S. Paul, Marco Meyer, R. G. Henry, N. Perrin, C. W. Beausang, M. G. Porquet, G. Bastin, R. M. Clark, N. Poffé, F. Hannachi, M. P. Carpenter, B. J. P. Gall, F. Azaiez, R. Béraud, Josette Duprat, C. Schück, M. A. Bentley, C. Bourgeois, R. Duffait, I. Ahmad, A. Korichi, N. Redon, S.J. Gale, R. V. F. Janssens, T. L. Khoo, P. Willsau, M. Kaci, H. Sergolle, and R. Wadsworth

Subjects
Physics, Proton, 010308 nuclear & particles physics, Phase (waves), Mercury Isotopes, Condensed Matter Physics, 01 natural sciences, 7. Clean energy, Atomic and Molecular Physics, and Optics, Dipole, medicine.anatomical_structure, 0103 physical sciences, medicine, Atomic physics, Nuclear Experiment, 010306 general physics, Spin (physics), Beam energy, Nucleus, Mathematical Physics, Excitation
Abstract

The 192Hg nucleus has been produced via the 36S(160Gd, 4n) reaction at a beam energy of 159 MeV. The γ-rays have been detected with the multi-detector array EUROGAM phase 1. The level scheme has been extended up to 10.4 MeV excitation energy and spin 34. Two new structures, composed of competing ΔI = 1 and ΔI = 2 transitions, have been observed and, for the first time in Mercury isotopes, some links with the previously known low-lying states have been established. These experimental results are discussed in terms of mean-field Hartree-Fock plus BCS calculations and the new bands are proposed to originate from deformation-aligned quasi-proton excitations. π(i13/2 * h9/2)kπ=11 and π(h9/2)2kπ=8+ coupled to rotation-aligned quasi-neutrons v(i13/2)n and quasi-proton π(h11/2)2 excitations.

Published
1995
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45. New results on the superdeformed band in192Hg

Author

J. Simpson, M. Aïche, A. Korichi, T. Lauritsen, C. Schück, T. L. Khoo, R. G. Henry, F. Hannachi, E. S. Paul, M. P. Carpenter, J.F. Sharpey-Schafer, I. Deloncle, R. V. F. Janssens, Y. Le Coz, Marco Meyer, C. W. Beausang, N. Poffé, Josette Duprat, F. Azaiez, G. Bastin, R. Béraud, N. Redon, A. G. Smith, K. Hauschild, N. Perrin, M. G. Porquet, R. M. Clark, M. Kaci, H. Sergolle, R. Duffait, P. Willsau, R. Wadsworth, I. Ahmad, C. Bourgeois, Malcolm J. Joyce, and B. J. P. Gall

Subjects
Baryon, Nuclear reaction, Physics, Nuclear and High Energy Physics, Excited state, Nuclear Theory, Hadron, Nuclear structure, Atomic physics, Moment of inertia, Nuclear Experiment, Nucleon, Spectral line
Abstract

New results on the192Hg superdeformed band have been obtained with EUROGAM. The experiment has been performed with the160Gd(36S,4n) reaction at 159 MeV. Above 800 keV the γ-ray energies differ from the previously published ones. Thus the rise of the dynamical moment of inertia\(\mathfrak{F}^{(2)} \) above ħω=0.4 MeV is no longer observed. This is in better agreement with recent cranked Hartree-Fock-Bogoliubov calculations.

Published
1994
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46. First observation of a superdeformed nucleus produced in an α xn reaction channel

Author

J. Simpson, Malcolm J. Joyce, F. Hannachi, I. Deloncle, B. J. P. Gall, E. S. Paul, N. Perrin, F. Azaiez, R. Béraud, G. Bastin, K. Hauschild, N. Poffé, Y. Le Coz, Marco Meyer, H. Hübel, A. Korichi, R. M. Clark, C. W. Beausang, N. Redon, M. G. Porquet, J.F. Sharpey-Schafer, M. Kaci, C. Schück, H. Sergolle, Josette Duprat, R. Duffait, R. Wadsworth, A. G. Smith, M. Aïche, and C. Bourgeois

Subjects
Physics, Nuclear and High Energy Physics, education.field_of_study, Yrast, Population, Coincidence, medicine.anatomical_structure, medicine, Nuclear fusion, Channel (broadcasting), Atomic physics, education, Beam energy, Nucleus
Abstract

Recent data from the EUROGAM array have revealed the population of the yrast superdeformed (SD) band of192Hg in the α4n exit channel of the16O+184W reaction at 113 MeV beam energy. The nucleus assignment was made on the basis of the SD band transition energies, and the observation of characteristic X-rays and lowlying yrast γ-transition of192Hg in coincidence with the SD band γ-rays. Both the feeding and decay-out patterns of the observed SD band have been found similar to the ones previously measured in the (36S,4n) reaction.

Published
1994
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47. Evidence for deformation in

Author

O. Stezowski, T. Kutsarova, H. Sergolle, Anna Wilson, Josette Duprat, A. Bauchet, B. J. P. Gall, Ts. Venkova, Stephane Perries, A. Astier, N. Buforn, I. Deloncle, E. Gueorguieva, Matthias Meyer, Jean-Arcady Meyer, C. Gautherin, R. Lucas, M. G. Porquet, N. Redon, F. Hoellinger, A. Minkova, and N. Schulz

Subjects
Physics, Nuclear and High Energy Physics, Geometry, Deformation (meteorology)
Published
2000
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48. High-Spin Structure of the 113?116Cd Isotopes Produced by Heavy-ion Induced Fission Reaction

Author

N. Buforn, A. Astier, J. Meyer, S. Perri?s, N. Redon, M. G. Porquet, I. Deloncle, A. Bauchet, F. Azaiez, S. Bouneau, C. Bourgeois, J. Duprat, B. J. P. Gall, C. Cautherin, E. Gueorguieva, F. Hoellinger, T. Kutsarova, R. Lucas, A. Minkova, N. Schulz, H. Sergolle, T. Venkova, and A. N. Wilson

Subjects
Physics, Isotope, Nuclear Theory, Prolate spheroid, Spin structure, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Nuclear fission, Isotopes of cadmium, Heavy ion, Atomic physics, Nuclear Experiment, Spin (physics), Mathematical Physics
Abstract

High-spin states in 113–116Cd have been investigated with the heavy-ion induced fission reaction 28Si + 176Yb at 165 MeV. The experiment was performed with the Eurogam II array. New rotational bands based on two quasi-particle states have been observed for even-even cadmium isotopes. A new level scheme based on the 11/2– isomeric state is proposed for 115Cd and the one of 113Cd has been extended to spin (31/2–). Hartree–Fock calculations for even-even isotopes show a prolate deformation in this mass region. The decoupled bands identified in both odd nuclei are interpreted as being built upon a low-Ω11/2 quasi-neutron configuration.

Published
2000
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49. The E2 transition probability and effective charge for the neutron i132 subshell in lead isotopes

Author

H. Sergolle, G. Albouy, G. Auger, C. Roulet, Jean Vanhorenbeeck, Michèle Pautrat, H. Richel, J.M. Lagrange, Institut de Physique Nucléaire d'Orsay (IPNO), 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 reaction, Physics, Nuclear and High Energy Physics, Range (particle radiation), Isotope, 010308 nuclear & particles physics, Astrophysics::High Energy Astrophysical Phenomena, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Effective nuclear charge, Nuclear physics, Low energy, 0103 physical sciences, Neutron, Heavy ion, Atomic physics, Nuclear Experiment, 010306 general physics, Multiplet
Abstract

In (heavy ion, xn) reactions, X-rays and low energy γ-rays emitted by the compound nuclei are investigated using a catcher system for recoiling nuclei within the 10–100 keV energy range. The nucleide 198Pb is studied by means of this technique. A 90 keV E2 (or E2 + M1) transition is identified together with information related to the 12+ → 10+ E2 transition energy. The B(E2; 12+ → 10+) value is deduced. The effective charge extracted from the analysis of the reduced transition probability between two members of the (vi132)−2 multiplet is compared to the corresponding values for other lead isotopes.

Published
1978
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50. HIGH SPIN ISOMERIC STATES IN 197Pb

Author

G. Auger, C. Roulet, Jean Vanhorenbeeck, M. Pautrat, G. Albouy, J.M. Lagrange, H. Sergolle, H. Richel, Institut de Physique Nucléaire d'Orsay (IPNO), 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, [PHYS.HIST]Physics [physics]/Physics archives, Astrophysics::High Energy Astrophysical Phenomena, General Engineering, Gamma ray, Heavy ion, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Atomic physics, Nuclear Experiment, Table (information), Spin (physics), 3. Good health
Abstract

High spin isomeric states in 197Pb have been investigated by in-beam gamma ray technics. These states are produced in (heavy ion, xn) reactions. various experiments performed are summarized in table I.

Published
1978
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