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4 results on '"C. Mittag"'

1. High-spin spectroscopy of the reflection-asymmetric nucleus $^{221}$Ac

Author

R. Kulessa, F. Riess, J. Chevallier, Ch. Briançon, J.S. Dionisio, M. Wieland, E. Lubkiewicz, J. C. Sens, A. Seghour, Ch. Vieu, C. Mittag, M. Aïche, J. O. Fernández Niello, E. Ruchowska, A. Chevallier, N. Schulz, M. Bentaleb, 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 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), 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, Parity (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, 3. Good health, State structure, medicine.anatomical_structure, 0103 physical sciences, medicine, Atomic physics, 010306 general physics, Spectroscopy, Nucleus
Abstract

The high-spin state structure of the nucleus 221 Ac was investigated by means of the 209 Bi( 14 C, 2n) reaction at 63 and 65 MeV. Measurements consisted of in-beam γγ coincidences using the Château de Cristal multidetector array and of e − γ coincidences. Two alternating parity bands could be established in 221 Ac up to spin 35 2 h . Almost all of the states may be regrouped into parity doublets and the origin of these doublets is discussed.

Published
1994

2. Yrast levels of 220Ra populated in the 208Pb(14C, 2n) reaction

Author

J. Żylicz, R. Kulessa, A. Celler, Ch. Briançon, C. Lauterbach, A. Lefebvre, Ch. Vieu, H. Puchta, J.S. Dionisio, F. Riess, J. Fernandez-Niello, C. Mittag, 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), and Lorgeril, Jocelyne

Subjects
Physics, Nuclear and High Energy Physics, Spins, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], 010308 nuclear & particles physics, Yrast, Parity (physics), [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], Moment of inertia, 01 natural sciences, Rotational frequency, medicine.anatomical_structure, 0103 physical sciences, medicine, Atomic physics, 010306 general physics, Nucleus, Excitation
Abstract

Yrast states in the nucleus 220 Ra were studied by means of the 208 Pb( 14 C, 2n) reaction at 61 and 64 MeV. A staggering sequence of levels of positive and negative parity has been observed up to spin and parity I π = 16 + (18 + ) and from I π = 5 − to I π = 17 − , respectively. These states are connected by strong E1 transitions competing with the stretched E2 transitions, the B( E 1) B( E 2) ratio being ~ 10 −6 fm −2 . The ratio of the excitation energy of the 4 + state to that of the 2 + state is close to the vibrational limit. The moment of inertia associated with the negative-parity yrast states is slightly increasing with the rotational frequency ω. It is considerably higher than that of the positive-parity states at lower spins, the difference decreasing monotonically with increasing ω. The data are discussed with reference to the octupole vibrational picture as well as to the results of recent models predicting reflection-asymmetric shapes in the Ra-Th region.

Published
1985

3. Coulomb excitation of $^{230}$Th

Author

J. P. Thibaud, Ch. Schandera, J. de Boer, C. Lauterbach, F. Riess, Ch. Briançon, A. Lefebvre, C. Mittag, R. T. Walen, C. F. Liang, R. Kulessa, H. Emling, A. Celler, R. S. Simon, 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, 010308 nuclear & particles physics, Projectile, 0103 physical sciences, Coulomb excitation, Atomic physics, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 010306 general physics, Spin (physics), 01 natural sciences, 3. Good health
Abstract

The level scheme of230Th is presented, as deduced from Coulomb excitation experiments using32S,84Kr and142Nd projectiles. The ground-state band is followed up to spin (24+) and the octupole band up to 19−. A comparison is made with the analogous bands known in232Th and232U.

Published
1983

4. High-spin states in $^{230}$Th populated via coulomb excitation with $^{142}$Nd projectiles

Author

Ch. Schandera, S. Hlavač, R.S. Simon, C. Lauterbach, J. de Boer, Ch. Briançon, A. Lefebvre, C. Mittag, F. Riess, 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, Coupling strength, 010308 nuclear & particles physics, Projectile, [PHYS.NEXP] Physics [physics]/Nuclear Experiment [nucl-ex], Coulomb excitation, [PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex], 01 natural sciences, Vibration, 0103 physical sciences, Atomic physics, 010306 general physics, Ground state
Abstract

The γ-radiation following Coulomb excitation of 230 Th is investigated. The maesurements establish the ground-state rotational band up to I φ = 22 + (24 + ) and the rotational band built on the K φ = 0 - octupole vibration up to the 21 - level. The alignment pattern shows that 230 Th is near a minimum of the coupling strength between the paired ground state and the rotation-aligned j 15 2 two-quasineutron configuration.

Published
1984

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