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1. 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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2. 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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3. 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

4. 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

5. 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

6. 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

7. 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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8. Fusion oscillations for symmetric light heavy-ion systems

Author

N. Poffé, N. Rowley, Robert S. Lindsay, 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 reaction, Nuclear and High Energy Physics, Fusion, Angular momentum, 010308 nuclear & particles physics, Coulomb barrier, Penetration (firestop), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Curvature, 01 natural sciences, Simple extension, 0103 physical sciences, Heavy ion, Atomic physics, 010306 general physics
Abstract

The low-energy fusion cross section for 20 Ne+ 20 Ne has been measured. The data extend the systematics on fusion oscillations for such light symmetric systems. A simple extension of the usual barrier penetration model displays the decisive role of the symmetrisation of the system. It is also capable of qualitatively explaining the trends in this effect, in particular its decreasing importance as the mass of the system increases. The structure is essentially due to the sharpness of the cut-off of transmission coefficients as a function of angular momentum. The curvature of the Coulomb barrier is important in determining these coefficients and it is shown that the required values of this quantity are consistent with reasonable values of the surface diffuseness of the nuclear potential.

Published
1983
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9. Correlations between emerging alpha-particles and heavy ions in 32S+197 Au collisions

Author

N. Poffé, A. Gamp, H. Doubre, J.C. Jacmart, J. Wilczynski, J.C. Roynette, 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, Field (physics), 010308 nuclear & particles physics, Projectile, Nuclear Theory, Alpha particle, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Ion, Nuclear physics, medicine.anatomical_structure, Coincident, 0103 physical sciences, Coulomb, medicine, Incident energy, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus
Abstract

In-plane angular correlations between α-particles and projectile residue nuclei ( Z =5−22) emerging from 32 S+ 197 Au collisions have been measured at 373 MeV incident energy. In the combined Coulomb field of the projectile residue and the target nucleus coincident α-particles are strongly focused into a narrow cone. Model calculations indicate that α-emission originates from the region of the projectile which is facing the target nucleus during the collision.

Published
1978
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10. Evaporation-residue cross sections in the $^{40}$Ca + $^{40}$Ca system

Author

A. Gamp, H. Doubre, J.C. Jacmart, N. Poffé, J. Wilczynski, J.C. Roynette, 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, Residue (complex analysis), Fusion, 010308 nuclear & particles physics, 0103 physical sciences, Analytical chemistry, Nuclear cross section, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences
Abstract

Evaporation-residue cross sections for the 40 Ca + 40 Ca system have been measured with a position-sensitive E − δE telescope. From the deduced values of the barrier and critical radii, it does not appear that the shell closure in 40 Ca has any influence on the fusion phenomenon.

Published
1978

11. On the time scale of $^{40}$Ca+$^{40}$Ca strongly damped reactions

Author

N. Frascaria, J.C. Jacmart, J.C. Roynette, H. Doubre, N. Poffé, M. Riou, 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 reaction, Nuclear and High Energy Physics, 010308 nuclear & particles physics, Scattering, Component (thermodynamics), Fission, Nuclear Theory, Inelastic collision, Inelastic scattering, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 7. Clean energy, 01 natural sciences, medicine.anatomical_structure, 0103 physical sciences, medicine, Atomic number, Atomic physics, Nuclear Experiment, 010306 general physics, Nucleus
Abstract

The time dependence of 40Ca+40Ca deep inelastic collisions is studied by means of the fragment change and mass distributions. Two time components are unfolded. The “fast” one exhibits all features of “quasi-fission”. The characteristics of the “slow” component cannot be distinguished from compound nucleus fission.

Published
1977

12. The yrast superdeformed band in $^{194}$Pb. Differences with $^{192}$Hg

Author

A. Korichi, M. Kaci, H. Sergolle, R. M. Clark, Josette Duprat, E. S. Paul, H. Hübel, J. Simpson, A. G. Smith, Y. Le Coz, R. Wadsworth, Marco Meyer, R. Béraud, C. W. Beausang, G. Bastin, N. Poffé, K. Hauschild, Malcolm J. Joyce, M. G. Porquet, F. Hannachi, J.F. Sharpey-Schafer, B. J. P. Gall, C. Schück, M. Aïche, R. Duffait, C. Bourgeois, I. Deloncle, N. Perrin, F. Azaiez, N. Redon, 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 Physique Nucléaire de Lyon (IPNL), 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, Yrast, 0103 physical sciences, Potential energy surface, Low frequency, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, 01 natural sciences, Spin-½
Abstract

The yrast superdeformed (SD) structure of 194Pb has been studied using the EUROGAM γ-ray spectrometer. New results have been obtained at low as well as at high spin values. At low frequency, the SD band has been extended to the lowest-spin SD state ever observed in the A ∼ 190 region. The energies of 194Pb and 192Hg SD bands are identical for ω < 0.25 MeV. However, they diverge for higher frequency, which rules out the idea that these two SD bands are identical. Moreover, the SD band of 194Pb is populated at lower spin values than that of 192Hg and de-excites towards normally-deformed (ND) states at a spin value lower than that of 192Hg. This suggests that the barrier separating the SD and ND minima in the potential energy surface is higher in 194Pb than in 192Hg.

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