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1. 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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2. 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

3. 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

4. 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

5. 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

6. 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

7. 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

8. 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

9. 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

10. 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

11. 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

12. 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

13. 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

14. High-spin excitations of $^{187-188}$Hg

Author

M. G. Porquet, J. P. Thibaud, F. Hannachi, N. Perrin, F.A. Beck, J. Dudek, C. Schück, D. Jerrestam, H. Sergolle, Ch. Bourgeois, Th. Byrski, G. Bastin, J.C. Merdinger, L. Hildingsson, Lorgeril, Jocelyne, 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), 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), and 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)

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Spins, 010308 nuclear & particles physics, Linear polarization, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Prolate spheroid, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, Angular distribution, Pairing, 0103 physical sciences, Oblate spheroid, Atomic physics, 010306 general physics, Electronic band structure
Abstract

High-spin states in 187, 188 Hg have been investigated via the 163, 164 Dy ( 28 Si , x n ) reactions by in-beam γ-ray spectroscopic techniques using the “Chateau de Cristal” 4π-multidetector array. Level schemes have been established. Spins and parities of the states have been deduced from transition multipolarities obtained from measurements of the angular distribution and linear polarization of the γ-rays. The shape coexistence of both prolate and oblate band structures has been observed for the first time in 187 Hg. In 188 Hg negative-parity bands are well developed. The band structure is interpreted within the frame of the Strutinsky method with the deformed Woods-Saxon average field. Pairing behaviour with increasing spin and general features of shape coexistence in mercury nuclei are illustrated.

Published
1988

15. High spin states in $^{205}$Pb and a precision test of the nuclear shell model for three nucleons

Author

C. G. Lindén, I. Bergström, H. Sergolle, K. Westerberg, K. G. Rensfelt, J. Blomqvist, 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
Nuclear reaction, Physics, Nuclear and High Energy Physics, Angular momentum, Spin states, 010308 nuclear & particles physics, Gyromagnetic ratio, Nuclear shell model, Nuclear structure, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, Nuclear physics, 0103 physical sciences, Neutron, Atomic physics, 010306 general physics, Nucleon
Abstract

Using the204Hg(α, 3n) reaction withα-particles of about 40 MeV, we have proved by applying nowadays conventionalγ-ray spectroscopy in-beam technique, that there are two isomeric states in205Pb at the excitation energies 5,161.3 and 3,195.5 keV having the half-lives 71±3 and 217±5 ns, respectively. These isomeric states have spins and parities 33/2+ and 25/2− and are mainly due to thei 13 2/−3 andi 13 2/−2 p 1 2/−1 configurations, respectively. This conclusion is supported by the experimentalg-factors of these states being −0.159±0.008 and −0.0676±0.0011, respectively. It is furthermore shown that theE2 effective neutron charge is the same forE2 transitions from the 33/2+ state in205Pb and from the 12+ state in206Pb as required by the assumption that the208Pb core is responsible for the totalE2 strength of the neutron holes, and that these states are due to thei 13 2/−3 andi 13 2/−2 configurations. The calculatedB(E3) values ofE3 transitions from isomeric states in205Pb and206Pb agree reasonably well with the experimental values as expected from the assumption that theE3-strength should come from particle coupling to the octupole states of the208Pb core. The energies of the six most well established excited states in205Pb with angular momenta in the region 19/2–33/2 were calculated using empirical single-particle energies, empirical two-particle interactions and angular momentum algebra. The average deviation between experimental and calculated energies is −3 keV and the root mean square deviation 6 keV as compared to the uncertainty ± 5 keV in the nuclear masses used in the calculation. For the orbits concerned the shell model is thus valid with an extremely high precision. The contribution of effective three-particle interaction in these orbits must consequently be less than about 5 keV.

Published
1976

16. Shape coexistence in $^{187}$Hg

Author

M. G. Porquet, F.A. Beck, Th. Byrski, H. Sergolle, J. P. Thibaud, D. Jerrestam, L. Hildingsson, C. Schück, C. Bourgeois, N. Perrin, G. Bastin, J.C. Merdinger, F. Hannachi, 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), 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, 010308 nuclear & particles physics, Elementary particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Excited state, 0103 physical sciences, Nuclear fusion, Atomic physics, 010306 general physics, Spectroscopy, Spin (physics), Degeneracy (mathematics), Beam (structure)
Abstract

Excited states of187Hg have been investigated via the164Dy (28Si,5n) reaction by means of in- beam gamma-ray spectroscopy using the multidetector 4π away “Ckāteau de. Cristal”. Different bands were populated up to spin I- 45/2. Coexistence of both prolate and oblate structures is observed for the first time in an odd- A Hg isotope. The crossing of aligned and strongly coupled sequences of levels built on the vi13/2 orbital infers the near degeneracy of oblate and prolate structures in187Hg.

Published
1986

17. Shape coexistence at high spin in $^{187}$Au

Author

G. Bastin, F. Beck, F. Hannachi, N. Perrin, M. G. Porquet, C. Bourgeois, H. Sergolle, Lorgeril, Jocelyne, 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, Condensed matter physics, 010308 nuclear & particles physics, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Prolate spheroid, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 0103 physical sciences, Oblate spheroid, Nuclear fusion, Band crossing, 010306 general physics, Spin-½
Abstract

High-spin states in187Au have been populated in the172Yb(19F, 4n) reaction and studied with in-beam spectroscopic techniques using the “Château de Cristal” 4π-multidetector array. A comprehensive level scheme of187Au has been established. Experimental band crossing frequencies and gains in alignment were deduced. Shape coexistence in187Au, well established at low spin, is found to survive up to spin 57/2, and manifests itself through well separated oblate and prolate structures.

Published
1989

18. Collective structures in $^{185}$Hg

Author

J.C. Merdinger, F. Hannachi, L. Hildingsson, C. Bourgeois, N. Perrin, H. Sergolle, J. P. Thibaud, G. Bastin, M. G. Porquet, F.A. Beck, 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 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 Lorgeril, Jocelyne

Subjects
Physics, Nuclear and High Energy Physics, Isotope, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Excited state, 0103 physical sciences, Nuclear fusion, Prolate spheroid, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract

Excited states of185Hg have been investigated via the161Dy(28Si, 4n) reaction at 145 MeV. In-beamγ-ray spectroscopic studies have been performed with the “Château de Cristal” 4π-multidetector array. A level scheme of185Hg has been established. Shape coexistence, still present in185Hg like in the neighbouring Hg isotopes, manifests itself through a weakly populated decoupled band built on the 13/2+ isomer and three strongly-coupled bands built on the prolate 1/2− [521], 7/2− [514], and 9/2+ [624] Nilsson states.

Published
1988

19. FACTEUR GYROMAGNÉTIQUE DE L'ÉTAT 12+ DES ISOTOPES DE PLOMB DE MASSE 198, 196 ET 194

Author

G. Auger, C. Roulet, J.M. Lagrange, Jean Vanhorenbeeck, K.G. Rensfelt, H. Richel, H. Sergolle, G. Albouy, M. Pautrat, 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
13. Climate action, 010308 nuclear & particles physics, [PHYS.HIST]Physics [physics]/Physics archives, 0103 physical sciences, General Engineering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract

Un état isomérique 12+, interprété comme un état à deux quasi-particules (νi 13/2)-2, a été mis en évidence dans les isotopes de plomb déficients en neutrons. Il possède une période de quelques centaines de ns, qui se prête à la mesure du moment magnétique par la méthode des distributions angulaires différentielles perturbées (TDPAD). Ces mesures ont été réalisées, afin de confirmer la configuration de l'état et d'étudier l'effet du nombre de nucléons sur les phénomènes de polarisation du coeur. Le tableau indique les valeurs expérimentales du facteur g et de la période du niveau 12+ des isotopes de masse A = 198, 196, 194. Une analyse multidimensionnelle des informations (Eγ, t) permet d'étudier simultanément ces trois noyaux, formés par la réaction naturelle W(16O, 4n)Pb. Les facteurs g sont reportés sur la figure, ainsi que les valeurs obtenues par ailleurs pour l'état 12+ du 206Pb [1], 200Pb [2] et l'état 13+/2 du 205Pb [3]. [MATH]. La constance de g en fonction de A suggère que les effets observés dans le 206Pb se retrouvent dans les isotopes plus légers, et notamment que la configuration (νi 13/2)-2 demeure largement dominante. L'écart notable à la valeur de Schmidt (g = - 0,294) peut s'expliquer par un important effet de polarisation du coeur. Un calcul, utilisant le formalisme de Arima et Horie, et une interaction résiduelle delta de surface (SDI) sont effectués pour rendre compte de ces résultats.

Published
1975
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20. SPECTROSCOPIE DE NOYAUX LOURDS DE TRANSITION ET SPHÉRIQUES

Author

H. Sergolle, 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
[PHYS.HIST]Physics [physics]/Physics archives, General Engineering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex]
Abstract

Plusieurs données spectroscopiques (schémas de niveaux, moments, densités de niveaux) relative à des noyaux magiques en protons (Pb) et des noyaux de transition (Hg, Pt, Au, Ir, Er) sont discutées. L'accent est mis sur la forme d'équilibre du noyau et les problèmes de coexistence de forme d'équilibre différents ainsi que de transition entre telles formes.

Published
1975
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