A. Lopez-Martens

Learn More
A new LINAG accelerator is developed for production of high intensity deuteron beam for the SPIRAL2 project. It will also deliver unprecedented high intensity stable beams that can be used for direct reactions on a target. The Super Separator Spectrometer (S<sup>3</sup>) is designed to open with these beams new horizons for the physics of rare nuclei and(More)
Aerosol samples have been studied under different background conditions using gamma-ray coincidence and low-background gamma-ray singles spectrometric techniques with High-Purity Germanium detectors. Conventional low-background gamma-ray singles counting is a competitive technique when compared to the gamma-gamma coincidence approach in elevated background(More)
Fast-neutron-induced fission of ^{238}U at an energy just above the fission threshold is studied with a novel technique which involves the coupling of a high-efficiency γ-ray spectrometer (MINIBALL) to an inverse-kinematics neutron source (LICORNE) to extract charge yields of fission fragments via γ-γ coincidence spectroscopy. Experimental data and fission(More)
The rotational band structure of the Z=104 nucleus (256)Rf has been observed up to a tentative spin of 20ℏ using state-of-the-art γ-ray spectroscopic techniques. This represents the first such measurement in a superheavy nucleus whose stability is entirely derived from the shell-correction energy. The observed rotational properties are compared to those of(More)
The E(gamma) - E(gamma) coincidence spectra from the electromagnetic decay of excited superdeformed states in (194)Hg reveal surprisingly narrow ridges, parallel to the diagonal. A total of 100-150 excited bands are found to contribute to these ridges, which account for nearly all the unresolved E2 decay strength. Comparison with theory suggests that these(More)
J. Robin,1 Th. Byrski,1 G. Duchêne,1 F. A. Beck,1 D. Curien,1 N. Dubray,1 J. Dudek,1 A. Góźdź,4 A. Odahara,1,2 N. Schunck,1,3 N. Adimi,5 D. E. Appelbe,6 P. Bednarczyk,1,14 A. Bracco,7 B. Cederwall,8 S. Courtin,1 D. M. Cullen,9 O. Dorvaux,1 S. Ertück,9 G. de France,1 B. Gall,1 P. Joshi,1 S. L. King,9 A. Korichi,10 K. Lagergren,8 G. Lo Bianco,12 S. Leoni,7 A.(More)
The linear polarization of gamma rays between excited and yrast superdeformed (SD) states in 190Hg was measured using the four-element CLOVER detectors of the EUROBALL IV gamma-ray spectrometer. This measurement shows in a model-independent way that the interband transitions which compete with the highly collective in-band quadrupole transitions are largely(More)
We report on the first measurement of the fission barrier height in a heavy shell-stabilized nucleus. The fission barrier height of 254No is measured to be Bf=6.0±0.5  MeV at spin 15ℏ and, by extrapolation, Bf=6.6±0.9  MeV at spin 0ℏ. This information is deduced from the measured distribution of entry points in the excitation energy versus spin plane. The(More)
The excitation energy, spin, and parity of the yrast superdeformed band in 152Dy have been firmly established. The evidence comes mainly from the measured properties of a 4011 keV single-step transition connecting the yrast superdeformed level fed by the 693 keV transition to the 27- yrast state. Four additional, weaker, linking gamma rays have been placed(More)
The excitation energy of the lowest-energy superdeformed band in 196Pb is established using the techniques of time-correlated gamma-ray spectroscopy. Together with previous measurements on 192Pb and 194Pb, this result allows superdeformed excitation energies, binding energies, and two-proton and two-neutron separation energies to be studied systematically,(More)