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Your search keyword '"Redon, A."' showing total 6 results
6 results on '"Redon, A."'

1. Superdeformed nuclear matter in nuclei with Z ≥ 82 : Magnetic properties and neutron shell gap.

Author

Redon, N., Buforn, N., Duffait, R., Lautesse, P., Meyer, M., Pr&eacue;vost, A., Stézowski, O., Astier, A., Bauchet, A., Deloncle, I., Porquet, M. G., Domscheit, J., Goergen, A., Hübel, H., Mergel, E., Neumann, S., Rossbach, D., Nenoff, N., Schoenwasser, G., and Wilson, A. N.

Subjects
*NUCLEAR physics, *PHYSICS, *NEUTRONS, *CONSTITUTION of matter, *PARTICLES (Nuclear physics), *SPECTROMETERS
Abstract

We report the results of an experiment, realized with the EUROBALL IV spectrometer, in which superdeformed (SD) states have been populated in 197,198Pb nuclei. Crosstalk transitions between two signature partner SD bands in 197Pb have been observed with an established Mi character, giving access to the magnetic properties of the v[752]5/2 intruder orbital. Six new SD bands have been identified in 197,198Pb. The results are interpreted in the framework of cranked Hartree-Fock calculations. A mixing between quasi-particle excitations and an octupole vibration is suggested in the two SD isotopes. [ABSTRACT FROM AUTHOR]

Published
2004
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2. High-spin states in the neutron-rich N = 50 region: nuclear structure close to 78Ni.

Author

Astier, A., Porquet, M.-G., Venkova, Ts., Prévost, A., Deloncle, I., Azaiez, F., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Gall, B. J. P., Khalfallah, F., Piqueras, I., Rousseau, M., Meyer, M., Redon, N., Stézowski, O., Lucas, R., and Bogachev, A.

Subjects
*NEUTRONS, *NUCLEAR physics, *PARTICLES (Nuclear physics), *NUCLEAR energy, *PROTONS
Abstract

The spectroscopy of fission fragments, obtained by the 18O+208Pb fusion-fission reaction at 85 MeV bombarding energy, has been performed with the Euroball IV γ-array. High-spin states in many neutron-rich Se, Br, Kr and Rb of the 78Ni region nuclei have been identified for the first time. Several physical aspects which govern the nuclear structure in this mass region are underlined thanks to the new results. Among those, empirical values of the residual proton-neutron interactions have been extracted for the πf5/2xvd5/2 and πp3/2xvd5/2 configurations. [ABSTRACT FROM AUTHOR]

Published
2009
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3. New high-spin states of 142 58Ce and 140 56Ba from fusion-fission reactions: Proton excitations in the N = 84 isotones.

Author

Venkova, Ts., Porquet, M.-G., Deloncle, I., Petkov, P., Astier, A., Prévost, A., Azaiez, F., Bogachev, A., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Durell, J., Gall, B. J. P., Houry, M., Khalfallah, F., Lucas, R., Meyer, M., Piqueras, I., and Redon, N.

Subjects
*HADRONS, *NUCLEAR fission, *NUCLEAR reactions, *PARTICLES (Nuclear physics), *NUCLEAR physics
Abstract

High-spin states in the 142Ce and 140Ba nuclei have been populated in the 12C + 238U and 18O + 208Pb fusion-fission reactions at 90MeV and 85MeV bombarding energy, respectively. The emitted γ -radiation was detected using the Euroball III and IV arrays. The high-spin yrast and near-to-yrast structures of 142Ce have been considerably extended. The level scheme of 140Ba has been extended by six new levels. The newly observed structures in these N = 84 isotones are discussed by analogy with the neighbouring nuclei. [ABSTRACT FROM AUTHOR]

Published
2007
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4. Medium-spin excitations of the neutron-rich84Se isotope: Possible decrease in energy of the N = 50 neutron-core excitation.

Author

A. Prévost, Porquet, M. G., Astier, A., Deloncle, I., Azaiez, F., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Gall, B. J. P., Khalfallah, F., Piqueras, I., Rousseau, M., Meyer, M., Redon, N., Stézowski, O., Venkova, Ts., Lucas, R., and Bogachev, A.

Subjects
*NUCLEAR shell theory, *PARTICLES (Nuclear physics), *NEUTRONS, *SPIN excitations, *NUCLEAR excitation, *NUCLEAR physics
Abstract

The84Se nucleus has been produced as fission fragment in the fusion reaction18O +208Pb at 85MeV bombarding energy and studied with the Euroball IV array. Medium-spin states of this neutron-rich isotope have been identified for the first time. Its level scheme has been obtained up to 4.9MeV excitation energy and spinI~ 7?. Its structure is interpreted by analogy with those of the stable heavier isotones. The evolution of the energy of theN= 50 neutron-core excitation is discussed as a function of the proton number. [ABSTRACT FROM AUTHOR]

Published
2004
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5. Evolution of the ... configuration in the neutron-rich ... and ... isotopes.

Author

Porquet, M.-G., Venkova, Ts., Astier, A., Bauchet, A., Deloncle, I., Buforn, N., Donadille, L., Dorvaux, O., Gall, B. J. P., Lalkovski, S., R. Lucas, Meyer, M., Minkova, A., Prévost, A., Redon, N., Schulz, N., and Stézowski, O.

Subjects
*PARTICLES (Nuclear physics), *NUCLEAR physics, *NUCLEAR fission, *NUCLEAR reactions, RHODIUM isotopes, SILVER isotopes
Abstract

The 110,112 Rh and 114',16Ag nuclei have been produced as fission fragments in the fusion reaction 18 + 208Pb at 85 MeV. Their level schemes have been built from gamma-rays detected using the Euroball IV array. High-spin states of these neutron-rich nuclei have been identified for the first time. The yrast structures consist of rotational bands in which the odd proton occupies the πg9/2 sub-shell and the odd neutron the vh11/2 sub-shell. The evolution of the πg9/2 ® vh11/2 band structure is analyzed as a function of the neutron number. [ABSTRACT FROM AUTHOR]

Published
2003
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6. Experimental Sign of a Weakening of the N=50 Spherical Shell Gap.

Author

Prévost, A., Astier, A., Deloncle, I., Porquet, M.-G., Azaiez, F., Buta, A., Curien, D., Dorvaux, O., Duchêne, G., Gall, B. J. P., Khalfallah, F., Piqueras, I., Rousseau, M., Meyer, M., Redon, N., Stézowski, O., Venkova, Ts., Lucas, R., and Bogachev, A.

Subjects
*PARTICLES (Nuclear physics), *NUCLEAR physics, *NUCLEAR fusion, *NUCLEAR fission, *NUCLEAR reactions
Abstract

High-spin states of 84Se, produced as a fission fragment in the fusion-fission reaction 18O+208Pb, have been identified for the first time thanks to the EUROBALL IV array. The excitation energies of three of these states, interpreted as being due to the (νg9/2-1 νd5/2+1) neutron-core excitation, give new insights about the evolution of the N=50 shell gap at the vicinity of 78Ni. © 2006 American Institute of Physics [ABSTRACT FROM AUTHOR]

Published
2006
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